World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_01/_antenna.txt

Text File | 1997-02-01 | 964KB | 23,447 lines

The World of Ham Radio CD-ROM



From Unknown Fri Jan 05 11:40:30 1996
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From: [e-mail] (THamm40820)
Newsgroups: rec.radio.amateur.antenna
Subject: Best counterpoise ??
Date: 1 Jan 1996 00:41:46 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Hi,
   I like random wires for several reasons, but because I work 100% QRP, I
 DO need to make the antenna as efficient as possible.  The antenna is to
be used on all bands 160-10 with an ATU.  The ôrightö side of the antenna
goes out the shack window about 10 feet, then up 10 feet, then horizontal
35 feet, the up 15 more feet, like so:

                                            |
                                            |
              __________________________________|
              |
    ______|

(Hold your applause foe the graphic please!)
Now, as for the ôleftö half of the antenna, IÆve tried several approches.
1)  The ôW3EDPö approach which is to add a counterpoise long enough to get
an integral number of 1/2 waves on the wire.  For example on 40 meters, at
7.125 Mhz, I used a counterpoise of 4Æ 4ö leaving 65Æ 8ö to radiate (4Æ 4ö
of the ôrightö side being ôcanceled outö by the counterpoise).
2)  I hung about 85 feet of wire along a 4 foot high wood fence, roughly
parallel to the antenna itself.  I tuned this with an MFJ artificial
ground and used it as a counterpoise.  IÆve also tried this without the
AG, connecting the ground wire directly to the tuner, since this just
becomes an OCF dipole.  Not much worry about imbalance and feedline
radiation since thereÆs no feedline, at least not in the usual sense.
3)  The one thing I havenÆt tried is to use a counterpoise wire cut
exactly to 1/4 wave since this would seem to put the highest current part
of the antenna at my ham desk instead of outside along the antenna wire.
No one of these setups *seems* to work any better than another on either
transmit or receive.
SO--- the question is, which one is actually the best?  Which one actually
puts the most power in the antenna and not the counterpoise?

Thanks for comments and 73s,
Tommy, KI7KH


From Unknown Fri Jan 05 11:40:31 1996
Path: news.epix.net!news.sprintlink.net!gate.net!news-adm
From: Bob North <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: SGC Smart Tuner
Date: 1 Jan 1996 04:43:04 GMT
Organization: B & B Imports
Lines: 7
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I live in a townhouse and am considering a long wire with a "Smart
Tuner." Would certainly appreciate hearing any comments re TVI etc.
Thanks,

Bob (N6JSC)




From Unknown Fri Jan 05 11:40:32 1996
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From: "David E. Shelton" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Gap Titan vs Cushcraft R7???
Date: 1 Jan 1996 06:07:14 GMT
Organization: University of Louisville, School of Nursing
Lines: 27
Message-ID: <4c7tmi$[e-mail]>
References: <[e-mail]> <4bs7k5$[e-mail]> <[e-mail]>
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To: [e-mail]

Erik,

You made the right choice I run a R7 and Butternut HF2V (40/80M vert.)
I would strongly discourage attempting to work 75/80M with the R7 as your
neighbors will hate you and the balun matching unit could be damaged, this
of course is dependent on the amount of power being used. However, I would
not recommend doing this at all. I have no experience with the Gap antenna
so I can say nothing about them. However, I can say that the Cushcraft R7
is a wonderful piece of equipment for any shack. I bought mine from
another ham used and he had it for 2-3yrs before me. I have had it for
3yrs and love it works fantastic on 17,15, es 10M. Performance is not as
good on the 40M band because of the size compromise. That is where the
Butternut HF2V comes in its a full 1/4 wavelength on 40M and 1/8
wavelength on 80M. The Butternut is a dream of an antenna signal reports
are always better on the Butternut when compared to the R7 on 40M, you
just cannot get away from the bigger is better philosophy. I will soon be
adding the 160M resonator to the Butternut and possibly the 30M one also.

I think you will have a lot of fun with the R7 and 10-40M, I would also
strongly discourage the running of the R7 in 40M outside of the <2:1 SWR
curve of 50 kHz. The curve is very steep and the RFI will run rampant
throughout your neighborhood.

Hope this helps,

de KE4FPS, David



From Unknown Fri Jan 05 11:40:33 1996
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From: "David E. Shelton" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HELP!  R-7 Problem?
Date: 1 Jan 1996 06:15:21 GMT
Organization: University of Louisville, School of Nursing
Lines: 16
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Gary,

I run an R7 with my Icom 728. You most definitely have a short in the coax
or the antenna feedpoint or possibly in one of the coils or balun matching
unit. I would of course not use the antenna when it is raining and get up
on the roof or where the R7 is and very closely inspect all of the above
mentioned items for possible cracks or any possible access water could
have in to cause this shorting out and sending the SWR so high.

Check it out I feel pretty strongly that I'm right on the money here.

73,

de KE4FPS, David




From Unknown Fri Jan 05 11:40:34 1996
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: feeding rotatable antenna with ladder line
Date: Mon, 01 Jan 96 07:19:03 GMT
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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   [e-mail] (tom medin) wrote:

>well, i now plan on open wire up to the mast (in the spring).  the
>reason for this is to be able to use the 20m monobander antenna on
>most higher bands (30m - 10m), so i will see quite high SWR, on some
>bands.  i just want a way to get past the rotating point with "no"
>loss in a high SWR line.

In that case, you will need to make the coaxial section as short as
possible, to minimize loss.  Also, you will need to be certain that
the voltage rating of the cable is sufficient.  Personally, I think
you're going to a lot of trouble for nothing.  The parasitic elements
won't be resonant on the other bands - why bother to use the antenna
this way? You'd be better off to feed the antenna with coax on 20M
only, and to install a non-resonant dipole with a separate ladder-
line feeder.

>now there seems to be a thread on balanced tuners.  what's wrong with
>the "Balanced Balanced Antenna Tuner" balanced L network in Feb '90
>QST?

I don't have that article, but I believe you're referring to the
"Measures" tuner.  The problem with that approach is that the tuned
components don't protect the balun against high common-mode voltage
generated on the line.  The balanced L or Pi certainly is a convenient
method of tuner construction, but it really needs a low-capacitance
input transformer (balun) to be assured of proper operation.  I
haven't been able to design a satisfactory device of that type in
my rudimentary workshop, so I'm gathering parts for a link-coupled
tuner.  There was a long thread about all this a couple months ago.

73,
Jack  WB3U


From Unknown Fri Jan 05 11:40:35 1996
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Twin-lead To trap vert.?
Date: Mon, 01 Jan 96 07:25:31 GMT
Lines: 11
Message-ID: <[e-mail]>
References: <[e-mail]>
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   [e-mail] (Glenn Schultz) wrote:

>Hi All, Has anyone ever tried feeding a trap vertical with twin lead?
>or any other vertical for that matter?

A trap vertical should be reasonably well-matched to coax.  Why do you
want to feed it with balanced line?

73,
Jack  WB3U


From Unknown Fri Jan 05 11:40:36 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!jmatk.tiac.net!user
From: [e-mail] (James M. Atkinson, Communications Engineer)
Newsgroups: comp.security.misc,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,comp.security.unix
Subject: TSCM Counter Surveillance, Privacy,  & Security Page
Date: Mon, 01 Jan 1996 08:42:16 -0500
Organization: tscm.com
Lines: 10
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: jmatk.tiac.net
Keywords: Security Counterintelligence Debugging Surviellance Wiretap
X-Newsreader: Yet Another NewsWatcher 2.1.3
Xref: news.epix.net comp.security.misc:24516 rec.radio.amateur.antenna:18162 rec.radio.amateur.equipment:23287 rec.radio.amateur.misc:96340 comp.security.unix:23045

Happy New Year!!!!!

TSCM, Counter Surveillance and Debugging Page new materials... Check it out...

http://www.tscm.com/

Large section on TSCM test equipment
Large section on TSCM training and career paths

- James M. Atkinson     "...shaken, not stirred"


From Unknown Fri Jan 05 11:40:37 1996
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From: [e-mail] (Krin135)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Improving mobile phone fringe reception?
Date: 1 Jan 1996 08:58:05 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <4c8p9d$[e-mail]>
References: <4c4e59$[e-mail]>
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antennas for 1.2 gig should not be too hard to find figures for- just
recalc the lengths for the 870 band

kc5evn

 "We must All hang together, else we most assuradly will Hang separately"
              Benjamin Franklin, 1776
Charles S. Krin, DO FAAFP


From Unknown Fri Jan 05 11:40:38 1996
Path: news.epix.net!news.sprintlink.net!grumman.com!grumman.com!not-for-mail
From: [e-mail] (Pat Masterson)
Newsgroups: rec.radio.amateur.antenna
Subject: 3/4 wave vertical on 20m ?
Date: 1 Jan 1996 10:29:59 -0500
Organization: Grumman Data Systems, Bethpage, New York, USA.
Lines: 17
Message-ID: <4c8uln$[e-mail]>
NNTP-Posting-Host: gateway.grumman.com

OK, its January now, so I'm beginning to think about
Field Day antennas. Our club usually erects about 4 of those
telescoping 50 foot poles in a straight line. One has a
tribander on top, and all are used to hold up some 40m
and 80m dipoles. I was thinking of using one of the poles as
a 3/4 wave vertical on 20 meters, since 50 feet seems to be
about the right number. We'll lay a bunch of radials on the
ground, and go at it. Will this work OK? I assume the impedance
should be near 50, but I'll use a tuner if necessary,
because I wont be able to adjust the lenght at all. Any ideas?
-pat

--
*  Pat Masterson  B38-111, Northrop Grumman Corp.*  Ham:KE2LJ
*  1111 Stewart Ave., Bethpage NY 11714          *  Packet: [e-mail]
*  516-346-6316                                  *  President Grumman Amateur
*  email: [e-mail]                        *  Radio Club  WA2LQO


From Unknown Fri Jan 05 11:40:39 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Which type of antenna for 77.5 kHz ?
Date: Mon, 01 Jan 96 11:29:22 PDT
Organization: EUnet Belgium, Leuven, Belgium
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I want to build a receiver for the German time transmitter in Frankfurt which
operates at 77.5 kHz.

Which type of antenna do I need ?

Thanks for replying to this message !!!





From Unknown Fri Jan 05 11:40:40 1996
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From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: References re Stacked Rhombics
Date: Mon, 01 Jan 1996 13:00:55 -0800
Organization: American Radio Relay League
Lines: 40
Message-ID: <[e-mail]>
References: <4c5st7$[e-mail]> <4c6hlh$[e-mail]>
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W8JI Tom wrote:

> One area almost always ignored, and one
>the modeling program you are using
> won't handle, are near-field ground losses
>in the area of the antenna. The
> second is the power actually radiated
>along the wire. Kuecklin had an
> excellent book (now out of print)
>detailing actual measurements of
> Rhombics, V's, and other long
>wire arrays in real test range (reformatted for easier reading)

Why do you think the ground losses
are so important?  People routinely
get excellent results from dipoles
that aren't very high, as long as
they use them for high angle paths.

I'd be more worried about optimizing
the signal at the angles of radiation
that are best for the paths I'm
trying to work, instead of worrying
about a little bit of ground loss. The
former can affect signals by 10s of dB,
while the latter is undoubtedly in the
single dB range.  Having a steerable
phased array would certainly be an
advantage in reducing the problem of
pattern nulls.

I wouldn't be surprised if an analysis
of the W6AM rhombic farm showed that too
much height reduced the signal at the
optimum angles of radiation for some 20
meter paths.  The "problem" is the sloping
terrain, which allow signals at very low
angles of radiation.

Zack KH6CP/1 [e-mail]


From Unknown Fri Jan 05 11:40:42 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.cs.utah.edu!cc.usu.edu!lwoert
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: fm dipole?
Message-ID: <[e-mail]>
Date: 1 Jan 96 13:14:08 MDT
Organization: Utah State University
Lines: 3

Can anyone out there give me instructions for making a dipole
using 300 ohm t.v. wire for fm broadcast stations?  I live
in a marginal sig strength area.  Thanks,  John N7ESP


From Unknown Fri Jan 05 11:40:42 1996
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From: [e-mail] (ZaaX)
Newsgroups: rec.radio.amateur.antenna
Subject: Butternut 80/40 Vertical Any Good?
Date: 1 Jan 1996 14:42:26 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <4c9df2$[e-mail]>
Reply-To: [e-mail] (ZaaX)
NNTP-Posting-Host: newsbf02.mail.aol.com

Is the Butternut HF-2V for 80 + 40 meters any good. I would appreciate
hearing from anyone that owns one of these.

73
Zack
N8FNR


From Unknown Fri Jan 05 11:40:43 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Hustler 10-80 vertical
Date: 1 Jan 1996 16:40:28 GMT
Organization: Pennsylvania Online [Usenet News Server for Hire]
Lines: 2
Message-ID: <4c92ps$[e-mail]>
NNTP-Posting-Host: 206.25.244.100
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Anyone had any experience with these antennas? Haviing a hard time tuning it.
Possibly could be because I'm next to a hill. Have
correct ground radials for each band(min of 4) so that shouldn't be a problem.
 Any advice would be appreciated.


From Unknown Fri Jan 05 11:40:44 1996
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: Mon, 01 Jan 96 18:31:44 GMT
Lines: 36
Message-ID: <[e-mail]>
References: <4c6i7c$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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   [e-mail] (Cecil A. Moore~) wrote:

>Bought me a SB-201 for Xmas. Two tubes and a pi-net output.

Congratulations!  Now you can share your stories of melted coax
and arc'd tuner parts with the rest of us victims.  I love QRO!!!

>The load is 100 ohms, resistive, and I think the pi-net
>achieves a conjugate match with no reflections. The SB-201
>SWR meter is calibrated for 50 ohms and reads 2:1  What
>function does the SWR meter serve? The manual says not to
>allow the SWR over 3:1 but the SWR meter is not measuring
>the SWR unless it's a flat 50 ohm system.

I thought the SB-200/201 series used a toroidal pickup?  No?

>Anybody know the conjugate matching range of the SB-201?

Probably even the Heath engineers don't know.  The 3:1 limitation
is the result of concerns for the increased voltage at the output
circuitry of the amplifier, not the matching range of the Pi.  Take
a look at the spacing on the loading capacitor and you'll see what
I mean.

Incidentally, I use non-foam RG-58 in the shack at the output of my amp
to eliminate the mess that would have resulted from connecting all the
inline accessories with RG-8.  To avoid damaging the cable, I *always*
bring the SWR down to less than 1.5:1 before activating the amp, and
usually operate with a match of 1.1:1 or better.  Generally, I run
between 500W and 1KW peak output, and so far, so good.  I'm just
mentioning this in case you're looking for more excitement in your
life.  ;)

73,
Jack  WB3U


From Unknown Fri Jan 05 11:40:45 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Doty article once ag
Date: 1 Jan 1996 18:53:30 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 12
Distribution: world
Message-ID: <4c9aja$[e-mail]>
References: <4bmo81$[e-mail]> <4boukb$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In article <4boukb$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:

>Things that re-write history should be tested before print. It isn't the
>fact of not having heard before. It's more a matter of printing things
>that defy common sense, especially when they can be confirmed in a matter
>of minutes.

But Tom, look at the bright side. Years from now, you may become
famous for "discovering" the conjugate match. :-)

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Fri Jan 05 11:40:46 1996
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From: [e-mail] (mfp)
Newsgroups: rec.radio.amateur.antenna
Subject: Test
Date: 1 Jan 1996 18:59:04 GMT
Organization: ArosNet
Lines: 2
Message-ID: <4c9ato$[e-mail]>
NNTP-Posting-Host: anp26.aros.net
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Test



From Unknown Fri Jan 05 11:40:47 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!psgrain!nntp.teleport.com!usenet
From: "Mark G. Wiltrakis" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Satellite antennas and trees
Date: 1 Jan 1996 19:06:38 GMT
Organization: Teleport - Portland's Public Access [phone]
Lines: 14
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I'm in the process of putting together a satellite station. I
need some advice regarding location of antennas for 2M and 440:

I have several siting options on my property, each with
particular advantages and disadvantages. How important is
having a "clear shot" at the satellite from the antenna?? How
much of a factor on xmit/receive are trees in the near field,
or at a distance (>100 feet)???

Thanks for your thoughts!

73, Mark  N7MMQ  Hillsboro, OR




From Unknown Fri Jan 05 11:40:48 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns
From: [e-mail] (Bob Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Which type of antenna for 77.5 kHz ?
Date: 1 Jan 1996 20:01:19 GMT
Organization: LI Net (Long Island Network)
Lines: 23
Message-ID: <4c9eig$[e-mail]>
NNTP-Posting-Host: linet04.li.net
X-Newsreader: TIN [version 1.2 PL2]

  For 100 KHz LORAN, I have seen short whips used on mobile units like
cars and airplanes.  For fixed service, my own experience favors a good
sized loop, maybe a meter or two in diameter, tuned and coupled for maximum
sensitivity.  A loop will be directional, allowing you to null out some
interference sources.

  I have a portable all-band receiver which uses a ferrite loopstick down
to 150 KHz, with reasonably good results.  Perhaps a large loopstick,
maybe around 20 or 30 centimeters long, could be wound with enough turns
and tuned to 77.5 KHz, and coupled into your receiver.

  At such a low frequency, atmospheric and man-made electrical noise will
be very strong, so the ultimate in sensitivity is not needed.  If you opt
for the short whip, use low-capacitance feedline and connect it to a high-Q
tuned circuit resonant at 77.5 KHz, and then couple that to your receiver
with a few turns of wire as a coupling link.  My guess is that you want a
high-L, low-C input tuned circuit, and a short, low-C feedline, if you
use a short whip.

  Maybe you could modify an old AM radio with a ferrite loopstick, which
tunes the longwave broadcast band.

  Bob Bruhns, WA3WDR, [e-mail]


From Unknown Fri Jan 05 11:40:49 1996
Path: news.epix.net!news.sprintlink.net!hookup!news.nstn.ca!news.cs.indiana.edu!umn.edu!newsstand.tc.umn.edu!gold.tc.umn.edu!dwar0001
From: [e-mail] (Robert M Dwarkin)
Newsgroups: rec.radio.amateur.antenna
Subject: Antenna (80m from MN to CT)
Date: 1 Jan 1996 20:08:24 GMT
Organization: University of Minnesota
Lines: 11
Message-ID: <4c9evo$[e-mail]>
NNTP-Posting-Host: gold.tc.umn.edu
X-Newsreader: TIN [version 1.2 PL2]

Hello-

I am interested in suggestions for 80m band antenna.
To be considered, the desired communication path will
primarily be from MN to CT ...

Thanks.

-Rob




From Unknown Fri Jan 05 11:40:50 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Peer review
Date: 1 Jan 1996 21:10:29 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 58
Distribution: world
Message-ID: <4c9ik5$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

I would like to make a few remarks about Peer Review. As an author of
very many technical articles, both Company in-house and published in
journals, both Amateur and Professional, and as Co-Editor (and
contributing author) of two technical books, published by McGraw-Hill,
it is a subject that I think I know something about
(more so than antennas, where my amateur status is now and forever secure).

1) When you have an article published you are always taking a chance.
   You work *very* hard to put out the best work that you know how to
   do. You get inputs from colleagues. You ask for reviews from those
   who are knowledgeable on the subject. You rework the material to the
   point that you get sick and tired of looking at it.

2) Finally, the article is published. And then you, or someone else,
   discovers that you a) left out something, b) didn't explain something
   carefully enough or c) you made a technical error of some kind. Then
   you write a Technical Correspondence or a Feedback segment, or something
   equivalent, where you have to "eat some crow" and try to make it all
   better.

3) Something else can happen. Further improvements in your understanding,
   or some input from a reader, helps you to a better appreciation of
   the subject. This has happened to me more times than I can remember.
   Technical knowledge is an ongoing thing and you say "why didn't I
   think of that!!!!!". And one other thing: *NO* subject is a closed book.
   We are always updating and improving the works of the past. I can
   think of many highly respected works and authors that have been
   refined, corrected, improved and better explained over the years. No
   author should feel "put down" about that.

4) So you are taking a chance. You are putting your credibility on the
   line. And there is no shortage of critics who will put the prod to
   you. It takes three things to deal with that: a) humility, b) a good
   sense of self-worth and c) a sense of humor. And some of the critics
   can be like "Ming the Merciless". It goes with the territory.

5) About Peer Review: a) the Peer who reviews has very rarely put in the
   effort to review that you have put into the writing, b) I have been
   reviewed by some who have deeply held beliefs that do not agree with
   my best understanding and to which I will not agree, c) it is a fact
   that sometimes those who claim the right to wear the black robe and
   sit on the Judge's bench really need to be on the witness stand.

6) Sometimes critics and reviewers can be abrasive and belittling
   "horse's butts" and they alienate a lot of their "victims" and
   also the good friends of their victims. Unfortunately, it is also true
   that quite often we have to listen to these people. Sometimes they
   speak the truth.

7) It is equally true that an author should not let himself be
   intimidated by the "turf guardians" who will resent his intrusions
   and try to belittle him or indulge in patronizing lectures.

8) Those who sit on the sideline and pick apart an author, based on
   their own "findings" or "conclusions" should submit their efforts
   for the same peer review as the author. That is a good thing about
   the internet and I see it happening. I also see it *not* happening.



From Unknown Fri Jan 05 11:40:52 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!ihnp4.ucsd.edu!news.cerf.net!ni1.ni.net!xband.ni.net!user
From: [e-mail] (J. L. Blanton)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: LPDA dimensions anyone?
Date: Mon, 01 Jan 1996 21:44:02 -0800
Organization: Network Intensive
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: xband.ni.net

In article <[e-mail]>,
[e-mail] wrote:

> Anybody know the element dimensions for a 5-element 10/12/15/17/20m
> Log Periodic Dipole Array.  I have one but not too interested in climbing
> the tower to measure right now - and I have a South American contact who
> is eager to build one.

Element dimensions of log-periodic antennas vary depending on several
parameters used in their design, such as the "scale factor", etc.  These
parameters are important when trading off bandwidth versus gain.  There is
no unique set of dimensions for a log-periodic array.  A good place to
start researching log-periodic antenna designs is the ARRL Antenna Book
(which has a chapter on log-periodic antennas).  Some of the other antenna
handbooks (Johnson/Jasik, Lo/Lee, etc.) have more detailed design
information.

Regards,

Lee, WA8YBT/6


From Unknown Fri Jan 05 11:40:53 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: Mon, 01 Jan 96 21:59:05 GMT
Lines: 14
Message-ID: <[e-mail]>
References: <4b9jgi$[e-mail]> <4bc3e4$[e-mail]> <4bc5vo$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   Paul Moller <[e-mail]> wrote:

>Black is usually achieved by adding carbon, which is lossy. Other colors
>should be more friendly. PVC in itself is not bad, and certainly not as
>lossy at hf as the rumor of years gone by has indicated.

Paul, have you seen any numbers for this, or other comparative
information?  I'm one of those who has stayed away from PVC because
of those rumors.  Do you know if PVC is less lossy than the "bad"
plastics like Nylon?

73,
Jack  WB3U


From Unknown Fri Jan 05 11:40:54 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: [Q] Homebrew Hardline?
Date: 1 Jan 1996 22:10:03 -0700
Organization: Primenet Services for the Internet
Lines: 13
Sender: [e-mail]
Message-ID: <4caenc$[e-mail]>
References: <4asvei$[e-mail]> <4bc60t$[e-mail]> <4bd9n2$[e-mail]> <4bml1c$[e-mail]>
Reply-To: [e-mail]
X-Posted-By: ip182.fhu.primenet.com
X-Newsreader: IBM NewsReader/2 v1.03

In <4bml1c$[e-mail]>, "Adam G. Lottes" <[e-mail]> writes:
>The formula from the ARRL Antenna Book is Z=276log2S/d where Z=line impedance
, S=ceter to center
>distance between conductors, and d=outer diameter of inner conductor in same
units as S.For
>example a 3/4 in copper pipe with a 5/16 inner conductor = ~ 51ohms.
>
>I just built the VHF directional coupler from the antenna book.  Works great
and the formula
>verified their dimensios are correct.
>
>Don't think I'd want to try building 50ohm hardline though. Good luck on your
 project
>
>George NF9D
>
And the hardline is only 1.50 a foot, youll spend more then that on your beads


From Unknown Fri Jan 05 11:40:55 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!ns1.iamerica.net!usenet
From: Darrell Barabash <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: 90 ohm cable on 300 ohm antenna
Date: Mon, 01 Jan 1996 23:25:57 -0600
Organization: iAmerica, Inc.
Lines: 20
Message-ID: <[e-mail]>
References: <4beib0$[e-mail]>
NNTP-Posting-Host: iad_ppp0221.iamerica.net
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To: Loren Coe <[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:12491 rec.radio.amateur.antenna:18183

Loren Coe wrote:
>
> what determines the impedance of an antenna?  is there anything i can do
> to mitigate the need for a matching xfmr.
>

Virtually every physical aspect of an antenna affects its impedance. Generally
,
though, a yagi type antenna is designed with a dipole as the driven element. Y
our
antenna is 300 ohms because the driven element is (probably) a "folded dipole"
. A
folded dipole looks like a rather narrow an elongated rectangle. One property
of a
folded dipole is that the "folding" is usually designed to cause a 4:1 impedan
ce
increase. Thus, a dipole which is typically about 73 ohms is transformed to ab
out
292 ohms (300 ohms effectively).

Replacing the driven element with a conventional dipole is one way of avoiding
 the
matching transformer. But, you should still use a 1:1 coaxial balun to convert
 from
unbalanced to balanced.

Darrell
Grapevine, TX


From Unknown Fri Jan 05 11:40:56 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!cygnus.com!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 3/4 wave vertical on 20m ?
Date: 2 Jan 1996 00:28:10 GMT
Organization: ELNEC/EZNEC Software
Lines: 24
Message-ID: <4c9u6q$[e-mail]>
References: <4c8uln$[e-mail]>
NNTP-Posting-Host: ip-pdx06-08.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

;   [e-mail] (Pat Masterson) writes:
;  OK, its January now, so I'm beginning to think about
;  Field Day antennas. Our club usually erects about 4 of those
;  telescoping 50 foot poles in a straight line. One has a
;  tribander on top, and all are used to hold up some 40m
;  and 80m dipoles. I was thinking of using one of the poles as
;  a 3/4 wave vertical on 20 meters, since 50 feet seems to be
;  about the right number. We'll lay a bunch of radials on the
;  ground, and go at it. Will this work OK? I assume the impedance
;  should be near 50, but I'll use a tuner if necessary,
;  because I wont be able to adjust the lenght at all. Any ideas?
;  -pat

The 3/4 wave vertical will have an impedance near 50 ohms when
resonant, but the main radiation will be at an angle of 60 degrees
above the horizon. This would be a poor antenna for anything but
communicating with stations that are very close (say, up to a
couple of hundred miles). You might think about making a J-pole
out of it instead, or just hang a 20 meter dipole from the same
feedpoint as the 40 or 80 meter dipole.

73,
Roy Lewallen, W7EL



From Unknown Fri Jan 05 11:40:58 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!ns1.iamerica.net!usenet
From: Darrell Barabash <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Why free space pathloss ?
Date: Tue, 02 Jan 1996 00:48:58 -0600
Organization: iAmerica, Inc.
Lines: 27
Message-ID: <[e-mail]>
References: <4bp72a$[e-mail]>
NNTP-Posting-Host: iad_ppp0215.iamerica.net
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To: Danie Brynard <[e-mail]>

Danie Brynard wrote:
>
> Why is the free space path loss different for different frequencies
> ? Thus every time you double the frequency the pathloss increase by
> 6dB. I know what the mathematical formulae say but can somebody
> just give a plain gutfeel common sense answer for this dummy ?
>

Let me give it a shot...

First, you should note that the "Power Density" at some distance, d,
from the source is INDEPENDENT of frequency.

        PwrDensity(d) = TXPwr/(4*PI*d^2)

I.e., this the TX power spread over the surface area of a sphere having
a radius of d.

The frequency dependence arises from the fact that the Gain of an
aperture is frequency dependent. The larger it is, in wavelenghts, the
higher the gain is.

        PwrGain = (4*PI*EffectiveArea)/(Lambda^2)

I don't know if that helps or not, Danie.

...Darrell


From Unknown Fri Jan 05 11:40:59 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: References re Stacked Rhombics
Date: 2 Jan 1996 02:01:16 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 83
Sender: [e-mail]
Message-ID: <4cal7s$[e-mail]>
References: <[e-mail]>
X-Newsreader: AOL Offline Reader

Hi Zak,

I hope you had a nice holiday. Santa probably brought you lots of UHF
gear? He dropped off some music type CD's and a book to read.

In article <[e-mail]>, Zack Lau <[e-mail]> writes:

>Why do you think the ground losses are so important?

Ground losses are very important at HF. If I was a skilled UHF op like you
I wouldn't worry have the importance of reducing ground losses drummed
into my head so well, but most of my time is spent on the other end of the
spectrum. In particular they are important if the antenna is very spead
out compared to it's height above ground.

> People routinely get excellent results from dipoles that aren't very
high, as long as
>they use them for high angle paths.

Even the performance of a dipole used for high angle communications can be
substantially improved by a ground "mat" or counterpoise system below the
antenna. This is also true for low angle communications, except ground
losses a greater distance away will also detract from performance. Both
increased height and a surface that improves conductivity can help a great
amount.
But in any event, the Rhombic is not a high angle radiator. A high angle
dipole is probably not a good comparison to use.

>I'd be more worried about optimizing the signal at the angles of
radiation
>that are best for the paths I'm trying to work, instead of worrying about
a little bit of >ground loss.

I probably didn't make my main point well enough. My point was the
addition of extra length could do nothing meaningful if current (power)
was not available at that distance from the feedpoint. I was repeating a
comment that Kuechlen and others attributed this primarily to ground
losses and radiation from the wire. They determined this from test range
measurements.

>The former can affect signals by 10s of dB,  while the latter is
undoubtedly in the
single dB range.

I don't have the exact figures, I think they are a little nebulous.
Everything I've read and experienced indicates HF ground losses are more
worrysome than a single dB. This would be especially true if the antenna
was parallel with and very close to the earth. Wave angle is important, as
you indicated. But, in the antenna being discussed, wave angle surely
isn't modified by adding additional wire that has no or little current in
it!

>Having a steerable phased array would certainly be an advantage in
reducing the >problem of pattern nulls.

That's why SW BC stations favor those types of arrays. And also because
the gain for a given physical size is much higher than obtainable in a
long wire array of any type.

>I wouldn't be surprised if an analysis of the W6A rhombic farm showed
that too much >height reduced the signal at the optimum angles of
radiation for some 20 meter >paths. The "problem" is the sloping terrain,
which allow signals at very low angles of >radiation.

I wouldn't know what that particular array actually did. But it is safe to
say any array that has maximum *freespace* radiation concentrated in a
narroe low angle lobe, like a 2 WL per leg Rhombic does, requires ground
reflection not interfere with the main lobe focus. Simply lowering a
Rhombic will reduce efficiency rather than modify the take-off angle.

As far as the optimum angle of any signal, in Reference Data for Radio
Engineers it's given as being between 2 and 25 degrees for 1000 mile
paths, depending on the height of the reflecting layer used. It's below 15
degrees for paths longer than 1500 miles. A chart of a actual 2880 mile
path shows the wave angle usually hovers in the 5 degree area, and only on
one occasion on 5 MHz reached 15 degrees during a daylight path.

I have a difficult time understaning how that applies to Kuechlen's
statement that making a long wire array longer than 3.3 to 3.9 WL results
in no additional gain, and can actually decrease it.

His statement was losses were primarily due to the inability to force
current out on the radiator, an


From Unknown Fri Jan 05 11:41:00 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!weld.news.pipex.net!pipex!plug.news.pipex.net!pipex!oleane!in2p3.fr!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail] (n4jvp)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Hustler 10-80 vertical
Date: Tue, 02 Jan 1996 02:49:42 GMT
Organization: Netcom
Lines: 15
Message-ID: <[e-mail]>
References: <4c92ps$[e-mail]>
NNTP-Posting-Host: ix-nas-nh1-18.ix.netcom.com
X-NETCOM-Date: Mon Jan 01  6:51:28 PM PST 1996
X-Newsreader: Forte Agent .99c/16.141

On 1 Jan 1996 16:40:28 GMT, [e-mail] wrote:

>Anyone had any experience with these antennas? Haviing a hard time tuning it.
 Possibly could be because I'm next to a hill. Have
>correct ground radials for each band(min of 4) so that shouldn't be a problem
. Any advice would be appreciated.

I have had two Hustler trap verticals, both all 5 band models. I had
no problems with either assembly or tuning. I doubt that a hill would
have that great an affect especially with a radial system installed.

What problems are you having tuning yours?

With out a few additional details all I can suggest is to walk through
the assembly instructions and recheck all measurements, this is to
make certain that it is assembled correctly. Check that the proper
connections are made to the coaxial feed.


From Unknown Fri Jan 05 11:41:01 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!charles1
From: [e-mail] (charles copeland)
Subject: Mobile HF antenna efficiency?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date: Tue, 2 Jan 1996 03:45:57 GMT
Lines: 5
Sender: [e-mail]

How efficient are mobile whip antennas compared to 1/2 wave
dipole installed at ones house?

10% ?



From Unknown Fri Jan 05 11:41:02 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!delmarva.com!udel!gatech!bloom-beacon.mit.edu!usc!cs.utexas.edu!uwm.edu!newsspool.doit.wisc.edu!news.doit.wisc.edu!news
From: [e-mail] (Jason Hanson)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Indoor Antenna Help
Date: Tue, 02 Jan 1996 04:04:24 GMT
Organization: University of Wisconsin, Madison
Lines: 18
Message-ID: <4cab0a$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: f180-047.net.wisc.edu
Xref: news.epix.net rec.radio.amateur.antenna:18178 rec.radio.amateur.misc:96365

I have an Icom IC-730 with no tuner.  I am trying to hook up some sort
of antenna system to work in my apartment bedroom.   I have purchased
100 ft of speaker wire, figuring I would be able to stretch it out and
pick up something, but I can't get a thing!  I can't even hear WWV for
crying out loud.  :)

What should I do?  The room is very small so I don't think I will be
able to make much of a configuration on the ceiling.  Am I doing
something wrong with the wire?  Would a tuner help?  Can anyone direct
me to an easy/small indoor antenna design on the web, or elsewhere?

Thanks in advance!

--
Jason J. Hanson            |    641 W. Main St. #315    |  [phone]
University of Wisconsin    |   Madison, WI 53703-4711   |  Ham: N9LEA (Extra)
--  [e-mail]   =*++*=   Proud Democrat, Badger fan, speeder  --



From Unknown Fri Jan 05 11:41:03 1996
Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!in2.uu.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: fleas
Date: 2 Jan 1996 04:51:38 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 4
Distribution: world
Message-ID: <4cadkq$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

I guess even among fleas, size is important. No flea should exaggerate
his own stature or importance, relative to other fleas, because he
may turn out to be less important than he thinks he is.



From Unknown Fri Jan 05 11:41:04 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!uwm.edu!news.sol.net!daily-planet.execpc.com!usenet
From: Rick McGaver <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Hustler 10-80 vertical
Date: 2 Jan 1996 05:43:15 GMT
Organization: None
Lines: 8
Message-ID: <4caglj$[e-mail]>
References: <4c92ps$[e-mail]>
NNTP-Posting-Host: germansheprd.execpc.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

hi,  have used the hustler 4btv & 5btv with and without radials. of
course with it works better but i used it with my rv mounting on the
ground or off the ladder on the motorhome. i worked plenty of dx although
a single band quater wave would perform better .. in a horserace with a
fellow ham n9au he had a mono band vetical ground plane and in prtable
his dx signal reports were 1 -3 db higher using the radio.
good luck   rick   nk 9g



From Unknown Fri Jan 05 11:41:05 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.mel.connect.com.au!news.syd.connect.com.au!news.bri.connect.com.au!soggy.eis.net.au!news
From: [e-mail] (Carlo Hamalainen)
Newsgroups: rec.radio.amateur.antenna
Subject: Pointers on FM reception?
Date: 2 Jan 1996 06:05:09 GMT
Organization: eis.net - Brisbane - Australia
Lines: 27
Message-ID: <4cahul$[e-mail]>
NNTP-Posting-Host: dialup-6.eis.net.au
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.3

Hello everyone,

I'll admit to being a complete dolt when it comes to electronics and radio
sorts of things (my knowledge is in computer programming).

I have a low end Sony stereo (with digital tuning). My problem is that my
favourite radio station doesn't have a bilion watt transmitter, so I get
crackle when i listen to it (mainly when people are talking, not so bad
when music is playing).

I've attached about 7 feet of insulated copper automotive wire to the
antenna connection, and the crackle has subdued a bit.

What else can I do? Would something simple like more wire do the trick?

If anyone could point me in the right direction to improving FM reception
I would be VERY grateful!

BTW, when i was at my aunt's place which is geographically a lot closer to
the radio station, reception was perfect even on my walkman (which usualy
is a $#% to get a good signal). I guess this means that the problem
definately is mine, not theirs.

Much thanks in advance,

-- carlo



From Unknown Fri Jan 05 11:41:06 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: References re Stacked Rhombics
Date: Tue, 02 Jan 1996 11:31:35 -0800
Organization: American Radio Relay League
Lines: 24
Message-ID: <[e-mail]>
References: <[e-mail]> <4cal7s$[e-mail]>
NNTP-Posting-Host: zlau.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.0b3 (Win16; I)
To: W8JI Tom <[e-mail]>

W8JI Tom wrote:

> I wouldn't know what that particular array actually did. But it is safe to
> say any array that has maximum *freespace* radiation concentrated in a
> narroe low angle lobe, like a 2 WL per leg Rhombic does, requires ground
> reflection not interfere with the main lobe focus. Simply lowering a
> Rhombic will reduce efficiency rather than modify the take-off angle.

I looked at the 3 wavelength/leg case on 20 meters. Page 13-11
of the ARRL Antenna book, 17th Edition.  EZNEC seems to
indicate that you can vary the take-off angle between 20 and 10 degrees,
by increasing the height from a low 35 ft to 100 ft. The latter case
has a deep null at 20 degrees, which hurts you on shorter paths.
>
> As far as the optimum angle of any signal, in Reference Data for Radio
> Engineers it's given as being between 2 and 25 degrees for 1000 mile

The difference in gain is about 2 dB--but this doesn't necessarily
mean the efficiency is less.  The pattern is spread out more, so you
would expect less gain.  I'm too lazy to do a pattern integration to
estimate the actual loss in efficiency.

Zack KH6CP/1
[e-mail]


From Unknown Fri Jan 05 11:41:07 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: References re Stacked Rhombics
Date: 2 Jan 1996 13:23:44 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
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Ooops, timed out. Anyway the current taper (power losses) was primarily
due to the inability to force current out on the element as it was made
longer. They attributed that to two major causes, ground effects from the
loosy ground below the antenna and radiated power losses as the current
moves out on the wire. That's why the section on long wire arrays
recommended keeping any Rhombic or V beam at least 1/3 the leg length
above earth in normal soil conditions at HF.

I really have very little experience with V's and Rhombics. I've had a few
V beams and two Inverted V antennas (which were half Rhomics turned on
side, not a droopy dipole), so I know the amount of power that makes it to
the far end of even a 2 WL antenna was three or four dB down from the
feedpoint power. Plus I've measured current in some Beverages, and the
power loss in ONE wavelength is over six dB.
What little I have seen seems to confirm Kuechlens data.

VOA also has curtains that fit inside a small area of the Rhomics. The
small area curtains (dwarfed by the Rhombics) have much higher gain than
their huge Rhombics.
All these reasons make me believe stacked or phased arrays of Rhomics
would be much better than simply making the Rhombic longer to obtain more
gain.

73 Tom


From Unknown Fri Jan 05 11:41:08 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!onlink3.onlink.net!usenet
From: [e-mail] (Rudy Benner)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Satellite antennas and trees
Date: Tue, 02 Jan 1996 14:30:22 GMT
Organization: Not at all organized.
Lines: 21
Message-ID: <4cbf74$[e-mail]>
References: <4c9bbu$[e-mail]>
NNTP-Posting-Host: tmns1_onlink1.onlink.net
X-Newsreader: Forte Free Agent 1.0.82

Trees make a considerable difference. Especially when they have
foliage. Take the appropriate messages. GL

"Mark G. Wiltrakis" <[e-mail]> wrote:

>I'm in the process of putting together a satellite station. I
>need some advice regarding location of antennas for 2M and 440:

>I have several siting options on my property, each with
>particular advantages and disadvantages. How important is
>having a "clear shot" at the satellite from the antenna?? How
>much of a factor on xmit/receive are trees in the near field,
>or at a distance (>100 feet)???

>Thanks for your thoughts!

>73, Mark  N7MMQ  Hillsboro, OR






From Unknown Fri Jan 05 11:41:09 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!box185.ams.vt.edu!user
From: [e-mail] (Ranson J. Pelt)
Newsgroups: rec.radio.amateur.antenna
Subject: Small 40 Meter Yagi???
Date: Tue, 02 Jan 1996 16:22:05 -0500
Organization: Virginia Tech
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: box185.ams.vt.edu

I've seen the HW-40, a helincally (sp?) shortened yagi.  Can someone
direct me to a small size 2-element yagi for 40 meters using loading
coils???

Tnx for the help.

73

--
Ranson J. Pelt
[e-mail]
QST de nz4i


From Unknown Fri Jan 05 11:41:10 1996
Newsgroups: rec.radio.amateur.antenna
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From: [e-mail] (James D. Cronin)
Subject: Re: Which type of antenna for 77.5 kHz ?
Message-ID: <[e-mail]>
Sender: [e-mail] (Operator)
Organization: Northern Telecom, Network Application Systems
References: <[e-mail]>
Date: Tue, 2 Jan 1996 17:21:04 GMT
Lines: 18

In article <[e-mail]>,
 <[e-mail]> wrote:
>
>I want to build a receiver for the German time transmitter in Frankfurt which

>operates at 77.5 kHz.
>
>Which type of antenna do I need ?
>
>Thanks for replying to this message !!!

For MW/LW reception tuned loop antennas seem to be the way to go.  You can
go for an air-wound loop or use ferrite rods for something more compact.
Either way it's easily built at low cost from junkbox parts.

Check the rec.radio.shortwave FAQ for the National Radio Club address.  They
publish a number of really good pamphlets on loop antennas.

73..Jim  N2VNO


From Unknown Fri Jan 05 11:41:11 1996
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From: [e-mail] (MVenable)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: LEARNING CW
Date: 2 Jan 1996 18:14:46 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 42
Sender: [e-mail]
Message-ID: <4cce96$[e-mail]>
References: <4b87ef$[e-mail]>
Reply-To: [e-mail] (MVenable)
NNTP-Posting-Host: newsbf02.mail.aol.com

[e-mail] (GARY RAWSON) wrote:

> Hello, I am N8VVD and currently have a NO CODE TECH license (I will
> get flamed for this). I have a goal of gettin my General before
> October 1996. I am wanting to do the Jamboree over the air contest
> with my Cub Pack (I am currently a den leader). I bought Morse code
> tapes from Radio Shack (the one with 4 tapes & goes to learning it
> to 13 WPM).

(Snip)

Gary

keep up the good work.  It is normal (was for me, anyway) to "get worse"
during the practice session.  That is just because your attention drops as
you get tired.  Learning new stuff is work.  You brain is trying to put
all this new information together and it hurts sort of :)  During the rest
times in between, your subconscious puts the information together and
programs your brain so it is a little easier next time.  You will notice
that the tapes recommend stopping for a couple of hours after 20 minutes
or so.

I found that I like Morse Academy (also shareware) better than Supermorse.
 It has a receiving game that sends characters at random which you have to
recognize and type in.  You can set the character speed, the word speed,
the number of characters in a group, and the time of the game all
separately.  I set the character speed pretty high and slowly speed up the
word speed.  It also helped me to have 2 or 3 character groups. If you
spend too much time on the first character you automatically miss the
subsequent ones.

Doing the above I was able to get 5 wpm and my Tech Plus in six weeks of
not working very hard.  Now I'm working on the General.  This will take
more concerted effort I'm sure.

It is also a good idea (I've heard, I haven't done this yet) to make your
own tapes either by computer or by recording W1AW.  You will soon memorize
the radio shack tapes.

Good Luck.

73  de Mark Venable  N1RSK


From Unknown Fri Jan 05 11:41:12 1996
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!news.rmii.com!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (MVenable)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: NEED CHEAP, EFFECTIVE SW BAND ANTENNA
Date: 2 Jan 1996 18:34:53 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 27
Sender: [e-mail]
Message-ID: <4ccfet$[e-mail]>
References: <4bvm42$[e-mail]>
Reply-To: [e-mail] (MVenable)
NNTP-Posting-Host: newsbf02.mail.aol.com

[e-mail] wrote:

>I have an old Hallicrafters S-120 receiver that's a bit banged up, but
still
>works rather well.  However, I would like to improve my reception by
leaps and
>bounds, especially at 5.065 MHz (WWCR out of Nashville).

>I live in Platteville, Wisconsin, approximately 25 miles northeast of
Dubuque,
>Iowa.  (sorry--don't have my lat and long handy)

>By using ingenuity and cheeeeeeeeeeeeap materials (you tell me what),

I bought a roll of insulated wire and just ran it out the window.  I have
165 feet of wire run out from my SW8, through a second story window to a
tree.  It is probably too long but I have been too lazy to shorten it,
make it into a dipole, put a matching network on it, or anything else that
might improve it.  The bottom line for me was any wire worked pretty well
and it was really cheap.  So try something (anything) and see what you
get.

You can also check out rec.radio.shortwave which has lots of threads on
SWL antennas.

Good Luck
Mark Venable


From Unknown Fri Jan 05 11:41:13 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr8ip25.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: References re Stacked Rhombics
Date: Tue, 2 Jan 1996 19:48:29 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 18
Message-ID: <[e-mail]>
References: <4cal7s$[e-mail]> <4cbt7g$[e-mail]>
NNTP-Posting-Host: usr8ip25.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4cbt7g$[e-mail]> [e-mail] (W8JI  Tom) writ
es:
>From: [e-mail] (W8JI  Tom)
>Subject: Re: References re Stacked Rhombics
>Date: 2 Jan 1996 13:23:44 -0500

[SNIP]
>All these reasons make me believe stacked or phased arrays of Rhomics
>would be much better than simply making the Rhombic longer to obtain more
>gain.

>73 Tom

FWIW, I have in my hand a QSL from VK5MC for a two meter EME contact.
For an antenna, he was using four stacked Rhombics 342' per leg which works
out to about 50 wavelengths. I don't know how optimum this is, but it
completed my 2M WAC :-))

73, Wes


From Unknown Fri Jan 05 11:41:14 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news1.digital.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!slwork
From: [e-mail] (Steve Work)
Subject: Re: PVC for Antennas
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
Date: Tue, 2 Jan 1996 21:00:18 GMT
Lines: 25
Sender: [e-mail]

Ian G3SEK ([e-mail]) wrote:
: :
:
: We have very little idea what is really in these plastics we call "PVC",
: "Nylon" etc. From the polymer chemist's point of view, these hardware-store
: materials are often seriously mis-labeled. They also contain a variety of
: unspecified filler materials.

: Put a sample in the microwave oven and try it, with a glass of water as a
: "dummy load". If it doesn't get warm in the time it takes to boil the
: water, you're in pretty good shape.

: In our microwave oven, black "PVC" drainpipe and black "polyethylene"
: antenna insulators remained as cool are the circulating air (my guesses at
: the base materials, but they certainly were black!) while grey "PVC" became
: quite hot. A large WW2-vintage ceramic coil former became noticeably warm.


What frequencies does this matter at?  I was trying to make a yagi for
100Mhz reception with white PVC as the boom and got some bizarre results.
Like adding elements which gave clearly worse reception than just a dipole.
Would it be better to just use wooden broomstick for the boom?  Or
something metal with only of the drive element insulated?  I thought it
didn't matter whether the boom was conductive or insulating so why would
something "in between" matter?


From Unknown Fri Jan 05 11:41:15 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news1.digital.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!slwork
From: [e-mail] (Steve Work)
Subject: Re: Pointers on FM reception?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
References: <4cahul$[e-mail]>
Date: Tue, 2 Jan 1996 21:09:40 GMT
Lines: 32
Sender: [e-mail]

Carlo Hamalainen ([e-mail]) wrote:
: Hello everyone,

: I'll admit to being a complete dolt when it comes to electronics and radio
: sorts of things (my knowledge is in computer programming).

: I have a low end Sony stereo (with digital tuning). My problem is that my
: favourite radio station doesn't have a bilion watt transmitter, so I get
: crackle when i listen to it (mainly when people are talking, not so bad
: when music is playing).

: I've attached about 7 feet of insulated copper automotive wire to the
: antenna connection, and the crackle has subdued a bit.

: What else can I do? Would something simple like more wire do the trick?


7 feet is **not** what you want.  Try a quarter wavelength (i.e. 31
inches/76cm).  You might also try making a dipole by attaching two such
pieces of wire to then end of a 75-ohm (cable-TV-type) coax, the whole
length of this should be about 1.5m with the coax attached to the
middle.  Try it in a variety of orientations, including vertical.

Dipoles of FM made of TV-type wire can often be bought quite cheaply, too.

Another option would be to use a TV antenna.  I don't know what TV
frequencies ozzie uses but I would suspect that like most places the FM
band is in the middle of TV frequencies.  Aim the TV antenna at the station.

You also might try to get a commercial FM antenna, the bigger the
better.  Be sure and get something directional, not "omnidirectional".  A
directional antenna is the only way to improve reception on faraway stations.


From Unknown Fri Jan 05 11:41:17 1996
Path: news.epix.net!news.sprintlink.net!EU.net!Belgium.EU.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Which type of antenna for 77.5 kHz ?
Date: Tue, 02 Jan 96 21:10:52 PDT
Organization: EUnet Belgium, Leuven, Belgium
Lines: 29
Message-ID: <[e-mail]>
References: <4c9eig$[e-mail]>
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In Article<4c9eig$[e-mail]>, <[e-mail]> write:
> Path:
Belgium.EU.net!EU.net!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns
> From: [e-mail] (Bob Bruhns)
> Newsgroups: rec.radio.amateur.antenna
> Subject: Which type of antenna for 77.5 kHz ?
> Date: 1 Jan 1996 20:01:19 GMT
> Organization: LI Net (Long Island Network)
> Lines: 23
> Message-ID: <4c9eig$[e-mail]>
> NNTP-Posting-Host: linet04.li.net
> X-Newsreader: TIN [version 1.2 PL2]
>

>   Bob Bruhns, WA3WDR, [e-mail]
Thanks for yout information. I think I'll stick to ferrite loopstick. ( I want

to build a small clock unit all-in-one ) You have any ideas how to interface
the antenna to an RF amplifier stage ? I want to build everything myself just
to keep in touch with electronics. I'm just missing some knowledge on ferrite
loopsticks.
Any idea which chip makes a good AM demodulator ? Do I need a local oscillator

?

Best regards,

Erik




From Unknown Fri Jan 05 11:41:18 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!ddsw1!news.mcs.net!indep1!clifto
From: [e-mail] (Clifton T. Sharp)
Subject: Weird antenna software?
Message-ID: <[e-mail]>
Organization: as little as possible
Date: Tue, 2 Jan 1996 21:45:01 GMT
Lines: 20

Is there any software out there that will take a description of a
radiator, no matter how strange, and give an indication of performance?
For example, I input a description of a goalpost, specify a feedpoint,
and find out the impedance and pattern.

It might sound like a strange thing to want, but I think it would help
my understanding of antennas to play with something like that. Actually,
every antenna design I've ever seen seems to me to be some topological
variation of one of two shapes, and that pretty much stifles my
imagination.

Besides, after an acquaintance who studied EE-level antenna design
told me about a slightly-modified yagi that had a sharp NULL in the
front, it started me thinking about what neat things can happen when
you "do it wrong".

--
   Cliff Sharp                  There are days when no matter which
     WA9PDM                      way you spit, it's upwind.
  [e-mail]       --The First Law of Reality


From Unknown Fri Jan 05 11:41:19 1996
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.localnet.com!ub!eerie.acsu.buffalo.edu!news.kei.com!newsfeed.internetmci.com!in2.uu.net!holmes.sgate.com!jekyll.sgate.com!donovanf
From: Frank Donovan <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: References re Stacked Rhombics
Date: Tue, 2 Jan 1996 21:50:50 -0500
Organization: Southgate Internet Host
Lines: 21
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: jekyll.sgate.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Probably the most well known reference on this topic is
"Radio Antenna Engineering" by Edmund A Laport.
Section 3.23.4 is titled:  Rhombic Antenna Arrays

73!
Frank
W3LPL
[e-mail]


On Fri, 29 Dec 1995, George L. Hiscox wrote:

> During the past few evenings I have been computer modeling some
> rhombics using EZNEC.  It occurred to me that there might be
> something to be gained by stacking them as one might stack yagis.
> I have checked the usual antenna references and have been unable
> to locate any writings on stacked rhombics.
>
> If anyone out there knows of any references on the subject or has
> any personal experience with feeding stacked rhombics I would
> appreciate an email or a followup to this post.


From Unknown Fri Jan 05 11:41:20 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uchinews!ncar!elroy.jpl.nasa.gov!swrinde!newsfeed.internetmci.com!info.ucla.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: 3 Jan 1996 00:19:33 GMT
Organization: ELNEC/EZNEC Software
Lines: 15
Message-ID: <4cci2l$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-pdx15-11.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   Ian G3SEK <[e-mail]> writes:

>. . .

>  Put a sample in the microwave oven and try it, with a glass of water as a
>  "dummy load". If it doesn't get warm in the time it takes to boil the
>  water, you're in pretty good shape.

>. . .

Although the converse isn't necessarily true. If it does get warm, it might
still be o.k. at HF.

Roy Lewallen, W7EL



From Unknown Fri Jan 05 11:41:21 1996
Path: news.epix.net!news.sprintlink.net!wizard.pn.com!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns
From: [e-mail] (Bob Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Pointers on FM reception?
Date: 3 Jan 1996 00:23:06 GMT
Organization: LI Net (Long Island Network)
Lines: 6
Message-ID: <4cci9a$[e-mail]>
NNTP-Posting-Host: linet04.li.net
X-Newsreader: TIN [version 1.2 PL2]

  Reception is always improved with an outside antenna.  A simple
roof or window mounted outdoor antenna oriented to favor the station,
feeding 300 ohm twin lead or preferably coaxial TV line if the radio will
accept it, would surely help.

  Bob Bruhns, WA3WDR, [e-mail]


From Unknown Fri Jan 05 11:41:22 1996
Path: news.epix.net!news.sprintlink.net!gryphon.phoenix.net!usenet
From: [e-mail] (Bill Holbert Sr.)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 160 meter trap
Date: Wed, 03 Jan 1996 01:14:30 GMT
Organization: Phoenix Data Systems
Lines: 26
Message-ID: <4cclf2$[e-mail]>
References: <4cc9ie$[e-mail]>
NNTP-Posting-Host: realbill.breh.phoenix.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (dick sander) wrote:

>Does anyone have a design for adding 160 meter traps to each leg of
>an 80 meter inverted vee? I built and 80 m vee and it works pretty
>good, so I though I'd add 160 m to it if I can find a construction
>article/plans to add traps

>73 Dick Sander - K5QY

Dick I can provide you with design data for traps to use with the 80 m
vee if you will provide me with some data about the vee.  What is the
resonant frequency of the current 80 m vee?  What portion of 160 m do
you want to operate?

The data that I will provide is based on building traps out of PVC and
the MINI-8 coax.  I currently have these traps in my inverted vee but
it is designed for the 40/80 m arangement but the computer program
will design to any frequency you like.

Let me know also what power you are interested in running on 160
meters.

73's, Bill Holbert, W5BBR





From Unknown Fri Jan 05 11:41:24 1996
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.gvn.net!nntp.coast.net!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Peer review
Date: 3 Jan 1996 01:44:55 GMT
Organization: Hewlett-Packard
Lines: 19
Message-ID: <4ccn2n$[e-mail]>
References: <4c9ik5$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4c9ik5$[e-mail]>,
 <[e-mail]> wrote:
>I would like to make a few remarks about Peer Review. As an author of
>very many technical articles, both Company in-house and published in
>journals, both Amateur and Professional, and as Co-Editor (and

I have just gotten involved in technical writing the last few years
and have started running into a lot of the same things you were saying.
I am relieved to find out that this is "normal" :-)  I was beginning
to wonder if there was something wrong with me.  Thanks for sharing
your experience with us.

Later this year I am planning to submit my first peer reviewed paper,
against the advice of many colleagues.  After reading your essay, I
am going to have a sense of humor about it and not get nervous about
the process.  As you say, it is an imperfect process.

Rick Karlquist N6RK
[e-mail]


From Unknown Fri Jan 05 11:41:25 1996
Path: news.epix.net!news.sprintlink.net!ionews.ionet.net!usenet
From: Hank Blackstock <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Antenna Help?
Date: 3 Jan 1996 03:35:52 GMT
Organization: IONet
Lines: 16
Message-ID: <4cctio$[e-mail]>
References: <Pine.SOL.3.91.960102180444.21602A-100000@bingsun2-gw>
NNTP-Posting-Host: osip38.ionet.net
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To: [e-mail]

tom <[e-mail]> wrote:
 I would prefer a smaller base or mid loaded coil
>arrangment

Small or base loaded is going to result in terrible results on
the lower bands (40 or 80). For those bands you might as well
have a dummy load if you are unwilling to use a large
centerloaded antenna with a capacity hat mounted as high as
possible. 20 meters up the differences become less.

The best mounting system for a plastic vehicle is a trailer
hitch mount. Check with Texas Bugcatcher (see ads in QST) for
trailer hitch mounts.

73 Hank WA5JRH



From Unknown Fri Jan 05 11:41:26 1996
Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: References re Stacked Rhombics
Date: 3 Jan 1996 05:48:13 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 39
Sender: [e-mail]
Message-ID: <4cdmtd$[e-mail]>
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Hi Zak,
In article <[e-mail]>, Zack Lau <[e-mail]> writes:

>I looked at the 3 wavelength/leg case on 20 meters. Page 13-11
>of the ARRL Antenna book, 17th Edition.  EZNEC seems to
>indicate that you can vary the take-off angle between 20 and 10 degrees,
>by increasing the height from a low 35 ft to 100 ft. The latter case
>has a deep null at 20 degrees, which hurts you on shorter paths.

The charts and graphs in the Handbook are interesting, but I believe they
do not fully account for less than perfect ground (in the reflection
charts for horizontal antennas). It also appears the graphs in the Rhombic
section do not deal with real world conditions which include losses in the
conductors from radiation, coupling to the lossy earth below the antenna,
and ohmic conductor losses.

Correct me if I am wrong, but I believe those are all important
considerations as the antenna is made lower or longer.

I also am not sure as to the accuracy of a program like EZNEC for this
application. Many of these programs have great flaws when modeling
antennas over real earth. Maybe someone with insight of EZNEC's operation
can help there.

None of this changes the answer I was trying to give, and I'm very
confident the answer is correct. That answer is "stacking or phasing
Rhombics is probably a good way to go, because the current in any long
wire element decreases as the wire is made longer--particulary if the wire
is close to ground".

The current taper is primarily due to ground coupled losses and radiated
power losses, according Kuechlin, by actual measurements at a real test
range. That effect is confirmed in many textbooks, as well as measured in
arrays I have used. Only a fraction of the transmitter power is available
at the termination of the antenna. My common sense tells me adding wire
where there is little power remaining can do little except waste space and
wire.

73 Tom


From Unknown Fri Jan 05 11:41:28 1996
Path: news.epix.net!news.sprintlink.net!hookup!bloom-beacon.mit.edu!panix!news.columbia.edu!sol.ctr.columbia.edu!news.ess.harris.com!su102w.ess.harris.com!harris.pander01
From: [e-mail] (Paul Anderson)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 160 meter trap
Date: Wed, 3 Jan 1996 05:57:07
Organization: Harris Corporation, GCSD
Lines: 17
Message-ID: <[e-mail]>
References: <4cc9ie$[e-mail]>
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>Does anyone have a design for adding 160 meter traps to each leg of
>an 80 meter inverted vee? I built and 80 m vee and it works pretty
>good, so I though I'd add 160 m to it if I can find a construction
>article/plans to add traps

You'd want "80 meter traps" -- resonant on 80 meters -- to convert an
80 meter dipole into an 80/160 trap dipole.  Look for a pair of Barker &
Williamson's (B&W) T-80's -- I think they're about $25/each.  They come with
plans to do just what you're considering.


***********************************************************
***  Paul Anderson                                      ***
***  E-mail:            [e-mail]             ***
***  Amateur Packet:    AB4VA @ KD4WLE.#MLBFL.FL.USA.NA ***
***********************************************************


From Unknown Fri Jan 05 11:41:29 1996
Path: news.epix.net!news.sprintlink.net!eskimo!guysmiley.blarg.net!news.kimbro.com!news.frugal.com!ip-175.frugal.com!user
From: [e-mail] (Sterling Fisher)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 3/4 wave vertical on 20m ?
Date: 3 Jan 1996 08:02:53 GMT
Organization: Frugal Internet - Public access in Sumner, WA
Lines: 25
Message-ID: <[e-mail]>
References: <4c8uln$[e-mail]>
NNTP-Posting-Host: ip-175.frugal.com

In article <4c8uln$[e-mail]>, [e-mail] (Pat
Masterson) wrote:

> OK, its January now, so I'm beginning to think about
> Field Day antennas. Our club usually erects about 4 of those
> telescoping 50 foot poles in a straight line. One has a
> tribander on top, and all are used to hold up some 40m
> and 80m dipoles. I was thinking of using one of the poles as
> a 3/4 wave vertical on 20 meters, since 50 feet seems to be
> about the right number. We'll lay a bunch of radials on the
> ground, and go at it. Will this work OK? I assume the impedance
> should be near 50, but I'll use a tuner if necessary,
> because I wont be able to adjust the lenght at all. Any ideas?
> -pat

And don't forget, any metal (like a beam) connected to the top of the mast
will provide top loading and could change the resonant frequency
significantly.

Sterling Fisher, KD6Z

--
Sterling Fisher
Lynnwood, Washington
[e-mail]


From Unknown Fri Jan 05 11:41:31 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!news.tek.com!netman.ens.tek.com!not-for-mail
From: [e-mail] (Terry Burge)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Stupid transmission line
Date: 3 Jan 1996 09:00:36 -0800
Organization: Tektronix, Inc., Beaverton, OR, USA
Lines: 18
Distribution: world
Message-ID: <4cecnk$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: netman.ens.tek.com

In article <[e-mail]> [e-mail] (
FORREST GEHRKE) writes:
>
>HB> The books that I've read on transmission line theory talk about
>HB> twin-lead, shielded twin-lead, coax & waveguides, but I've never
>HB> seen anything about 'twisted pair'.  Should I presume that twisted
>HB> pair works the same way as twin-lead?  I.e., the twist itself has no
>HB> essential effect on the nature of the transmission line?


Twisted pair as in phone drop wire is twisted to prevent RF from
traveling on it. In other words, it has inductors every so often
to block the RF. Wouldn't exactly work to well for feeding RF don't
you think?

Terry
KI7M




From Unknown Fri Jan 05 11:41:31 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (ZaaX)
Newsgroups: rec.radio.amateur.antenna
Subject: Are Bilal Isotron antennas any good?
Date: 3 Jan 1996 09:00:39 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <4ce267$[e-mail]>
Reply-To: [e-mail] (ZaaX)
NNTP-Posting-Host: newsbf02.mail.aol.com

I would like to hear from anyone that owns a Bilal Isotron antenna. How
well
does it work for you? Do you feel that it is a good value? Is there
anything that
you don't like about it? If you have one for 80 or 40 meter how well does
it
perform? Any help with this will be greatly appreciated.

73
Zack Schindler
N8FNR


From Unknown Fri Jan 05 11:41:33 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!newsfeed.internetmci.com!in1.uu.net!sunrise.gv.ssi1.com!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: Wed, 03 Jan 1996 10:49:25 GMT
Organization: RST Engineering
Lines: 69
Message-ID: <4ceesi$[e-mail]>
References: <4b9jgi$[e-mail]> <4bc3e4$[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82


All I can do is comment on PVC, nylon, and the rest of the plastics
after doing antenna design and consulting for over 30 years.  I
realize that's not very much time (if you are a tree) but I have done
several hundred designs and prototypes, quite a few of which were done
using plastic as the construction medium.  Those of you who fly light
aircraft probably recognize some of those designs.

Anyway, I've used PVC plain old water pipe from below 30 MHz. to above
2 GHz. and if you allow a SLIGHT fudge factor for some minor
dielectric foreshortening and a SLIGHT fudge factor for some minor
dielectric losses, PVC is by far superior to anything else I've been
able to get my hands on as a construction support for prototypes and
one-off designs (like the ham antennas around the house).

As a matter of fact, I've just completed the design on a series of VHF
(100-200 MHz.) base loaded monopoles, which are notoriously "goosey"
to local perturbations in the immediate vicinity of the elements.  The
antennas are hermetically sealed in 3/4" PVC schedule 80 water pipe
and all that was required was about a 5% pruning factor (over and
above the regular 3-8% w/l factor) for the PVC loading.  Measurements
relative to the same monopole in air showed less loss than I can
measure with the HP/Tek antenna range that I do FCC measurements on
(0.1 dB reliably is about the best I can guarantee).

As to nylon being a bad actor, why do you suppose then that there is a
mil spec and a commercial spec for coil forms built on a nylon-filled
base and tube?  Sorry, this one doesn't wash either.

I am glad to see that somebody used the black ABS stuff and is
reporting good results with it for coil forms.  I've never used the
black just because I suspicioned that anything black probably had
dissolved carbon particles in it.  Glad to know I can at least start
messing around with it, as it is pretty stout stuff AND I can get
diameters up to 6" in the form of sewer pipe.

As an aside to particulate conductor matter in the mechanisms, I was
once called upon to make some tests with HF/VHF/UHF antennas installed
inside a  thin plywood shell, then the thin wood covered with dacron,
then the dacron impregnated with a paste (dope) made of solvent and
aluminum powder (a Bellanca aircraft wooden wing).  We thought the
aluminum dope would play hell with the antennas.  Not so.  Once again,
we set up two dipoles on the test range and put a wing in between
them.  Not a bit of loss.  Put the antenna inside the wing.  Couldn't
tell the difference.  Our guess was that the aluminum powder particles
were each suspended in a small sphere of the solvent and couldn't make
contact to form a continuous sheet.  On the other side of that coin,
we got reports that there was a German metallic paint that gave a
gorgeous finish, but that antennas buried inside the foam wing of
various homebuilt airplanes using this paint had the response of a
piece of spaghetti inside a copper septic tank.  I doesn't explains
'em, I just reports 'em.

Finally, as to the grey stuff (flex conduit) in PVC, I've used it, but
since the white stuff in the form of water pipe is cheaper, I've never
had a reason to mess with it very much.  Sorry, I don't buy the
"microwave oven" test for goodness of a material except at 2.4 GHz. or
so.

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen. Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Fri Jan 05 11:41:34 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!news.internetMCI.com!newsfeed.internetmci.com!iglou!n4lq
From: [e-mail] (Steve Ellington)
Subject: Re: AH3 Long wire tuner at home?
X-Nntp-Posting-Host: iglou
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Organization: IgLou Internet Services (1-800-436-4456)
X-Newsreader: TIN [version 1.2 PL2]
References: <[e-mail]> <4cdc7f$[e-mail]>
Date: Wed, 3 Jan 1996 13:16:37 GMT
Lines: 20


Keep in mind that if you go the radial route, you will probably need a
radial for each band and they need to be suspended above ground in order
to maintain resonance, a real trip! Pun intended. you're better off with
a balanced antenna plus it will take a lot less wire.



: >>>>
: I Use a similar AH2 with Random wire in the Attic.
: Try two things.
:       1. Add radials with at least one cut at 1/4 wave on each band you operate o
n. (more is better)
:       2. Place several Ferite RF absorbing blocks over the coax near the tuner to
 avoid RF comming
:            back on the outside of the coax.

: 73
: Larry KJ6PJ

--
Steve Ellington [e-mail]  Louisville, Ky


From Unknown Fri Jan 05 11:41:35 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!nwfocus.wa.com!ender.techcenter.paccar.com!news
From: [e-mail] (Michael A. Sterba)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba array for 2 meters ?
Date: 3 Jan 1996 14:50:20 GMT
Organization: OES Skagit County WA.
Lines: 17
Message-ID: <4ce53c$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: kg7hq.paccar.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.4

Hello Mike,

In article <[e-mail]>,
[e-mail] says...
>Has any one ever tried a sterba curtain (vertical polarization) for 2 meters
?
>If so, please let me know about your experiences.

Yes I have. I used it as a stationary beam for repeaters to my north when I wa
s in San
Diego. It worked like a dream for me. It was suspended off a poly rope betwwen
 a
mast and a close tree.
If you want a rotating beam, you might want to go with a quad of yagi though.
I tried it do to being a family antenna. :)
Have fun.
--
                "Handcrafted From The Finest ASCII"
73's de KG7HQ



From Unknown Fri Jan 05 11:41:36 1996
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uchinews!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.msfc.nasa.gov!news.redstone.army.mil!news
From: Martin Soprano <Soprano>
Newsgroups: rec.radio.amateur.antenna
Subject: Round Robin (Twin Lead) Marconi
Date: 3 Jan 1996 15:05:55 GMT
Organization: RD-SE-EA
Lines: 10
Message-ID: <4ce60j$[e-mail]>
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X-URL: news:rec.radio.amateur.antenna

Hello.  Can anyone give me some construction advice on a Round Robin
Marconi antenna.  This is in regard to the December 95 article in "73
Amateur Radio Today".  I've constructed this antenna, but may have made
some incorrect assumptions (i.e. not inserting a 4:1 Balun and soldering
the very end of the twin lead (450 ohm)).  If anyone can help I would
appreciate it.

73, KS4OI  Martin




From Unknown Fri Jan 05 11:41:37 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.midplains.net!gw2.att.com!nntphub.cb.att.com!ssbunews!not-for-mail
From: [e-mail] (L.M.Leciejewski)
Subject: Butternut HF6V Problem
Message-ID: <[e-mail]>
Sender: [e-mail] (Netnews Administration)
Nntp-Posting-Host: ihgp65r.ih.att.com
Organization: AT&T
Distribution: usa
Date: Wed, 3 Jan 1996 18:42:55 GMT
Lines: 20

Hello,

I have been using a Butternut HF6V Antenna with my Kenwood TS940S/AT for about
 9
yrs now. Recently, on the 17 and 12 WARC Bands (I have the Butternut WARC Adap
ter
Kit) my SWR, after being tuned near 1.2:1, will jump intermittantly to over 3:
1
when transmitting USB. I took the antenna down last Fall and did a quick clean
up
but the problem still remains. Anyone else encounter this problem? Could this
be
a symptom of a bad capacitor on the HF6V (for the WARC Bands)?

Thanks in advance for any help

Lou

WB9DKY


--
==============================================================================
      Louis Leciejewski - AT&T Bell Labs - [e-mail] - WB9DKY
==============================================================================


From Unknown Fri Jan 05 11:41:38 1996
Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!in1.uu.net!inews.intel.com!itnews.sc.intel.com!fmsu03.fm.intel.com!mcd1.fm.intel.com!usenet
From: "Ken (KC6TEU)" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help Tuning 14AVQ
Date: 3 Jan 1996 19:13:40 GMT
Organization: Intel Corporation, Folsom CA, USA
Lines: 30
Message-ID: <4cekh4$[e-mail]>
References: <4cc60g$[e-mail]> <[e-mail]>
NNTP-Posting-Host: kmasonpc.fm.intel.com
Mime-Version: 1.0
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Jeff Blumenfeld KB3DX <[e-mail]> wrote:
>Dean -
>
>I have a Hustler 4BTV rather than a 14AVQ, but with virtually all
>trap verticals, the order of tuning is the same.  Start with the 10
>meter section, and tune by lengthening or shortening the tubing
>?=====>below the first trap (lengthening makes the antenna resonant at a
>higher frequency) to get it resonant on 10.  Then tune for 15,<====???
>lengthening or shortening the tubing ABOVE the first trap (i.e.,
>DON'T TOUCH the length of the tubing used for 10 meters).  Then so
>on for 20 and then 40.  Hope this helps
>
>Jeff KB3DX  [e-mail] Last wrote:
>>
>> I need some help tuning my 14AVQ antenna. Please could someone tell me
>> the order of tuning as per the manufacturers instructions.
>>
>> ------------------------------------
>> Dean Last  GM4THP
>> [e-mail]
>> --------------------------------------

Shortening makes the antenna resonant at a higher frequency!!!

                   73,
                      Ken Mason
                      KC6TEU
                      CM98LQ




From Unknown Fri Jan 05 11:41:39 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 3/4 wave vertical on 20m ?
Date: 3 Jan 1996 19:42:46 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 14
Distribution: world
Message-ID: <4cem7m$[e-mail]>
References: <4c8uln$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In article <4c8uln$[e-mail]>,
Pat Masterson <[e-mail]> wrote:

>... I was thinking of using one of the poles as
>a 3/4 wave vertical on 20 meters, since 50 feet seems to be
>about the right number.

Hi Pat, 3/4 WL is not a good length for a 20m vertical since
the radiation pattern is high angle. Above 5/8 WL, the pattern
develops high angle lobes, not good for the high bands at the
low of the sunspot cycle. High angle radiation is good for
low band local coverage, however.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Fri Jan 05 11:41:40 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Off-center fed dipole?
Date: 3 Jan 1996 20:06:13 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 19
Distribution: world
Message-ID: <4cenjl$[e-mail]>
References: <4c2cso$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In article <4c2cso$[e-mail]>,  <[e-mail]> wrote:
>I'm looking for a decent wire antenna I can use for 80 and 40m in my 130x40 c
ity lot.

Hi Eric, my 102 ft dipole fed with 300 ohm ladder-line is an efficient all-
band HF antenna. On 80m, a parallel cap at about 38 feet kills the reflections
and drops the impedance to a flat 300 ohms. On 40m, a 6 ft stub at the Xmtr
end does the same thing. A 4:1 balun takes the impedance from 300 ohms to 75
ohms. I need no antenna tuner on any HF band. The balun sees nothing but
300 ohms resistive so is not bothered by reactance. Common mode currents
don't bother it since it is a voltage balun. I think, after 8 years, I
finally have a wire antenna with which I'm happy.

I took a lesson from the techniques of the 1920's and 1930's when the
average ham didn't have coax, oscilloscopes, network analyzers, etc.
Most hams had access to a VTVM and a grid dip meter and that's all.
And yet they loaded their antenna systems more efficiently than most modern
day hams. I tried it and it worked great.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Fri Jan 05 11:41:41 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.mailorder.com!news.avatar.com!avatar.avatar.com!kory
From: Kory Hamzeh <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Need some help
Date: Wed, 3 Jan 1996 21:15:23 -0800
Organization: Avatar Consultants, Inc.
Lines: 32
Message-ID: <Pine.BSD/[e-mail]>
NNTP-Posting-Host: avatar.avatar.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


Hi Everyone,

I'm new to HF, so bear with me. I recently purchased and installed a GAP
Titan DX on the root of my house. The roof is about 15 feet of of the
ground, and the GAP is mounted about 3 feet off of the roof. Basically,
I'm very disappointed with the antenna. I monitor the locate DX cluster
and tune to the frequency once a dx spot is announced. I have yet to hear
one of the DX stations of SSB. Occasionally I can here some CW stations.
I have yet to have ANY QSOs on 80m and 40m. A couple on 20M and maybe a
dozen on 17M. Enough whining....

What I like to know is:

        1.      Can I remove the counter poise on the gap and add a bunch of
                radials? Would this help?

Or,

        2.      Should I dump the GAP and put up a inverted V style antenna
                on the roof like the G5RV? Are these dipoles directional or
                non-directional? Would these puppies outperfrom a vertical
                like the GAP titan. The center point would be about 25
                feet off of the ground, and ends would be about 15.

Any help or encouragement would be greatly appreciated.

Thanks,
Kory
KE6VWO




From Unknown Fri Jan 05 11:41:42 1996
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna,sci.physics.electromag
Subject: Re: Impedence of Twisted Pair, etc.
Followup-To: rec.radio.amateur.antenna,sci.physics.electromag
Date: 3 Jan 1996 21:52:43 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 42
Message-ID: <4cetrb$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]
Xref: news.epix.net rec.radio.amateur.antenna:18237 sci.physics.electromag:7479

WB3U ([e-mail]) wrote:
:    [e-mail] (Henry Baker) wrote:

: >Impedence in ohms @ 1-20 MHz               100 +- 15 ohms
: >Mutual capacitance in pF/ft @ 1 kHz         14.0 pF/ft nominal
: >Attenuation, dB/1000 ft. @   1 MHz           6 dB max
: >                         @   4 MHz          12 dB max
: >                         @  10 MHz          20 dB max
: >                         @  16 MHz          25 dB max
: >                         @  20 MHz          30 dB max
: >                         @ 100 MHz          67 dB max

: Thanks for the info.  Those are significant loss figures, at least
: compared to ladder line and open wire.  So much for that idea!  :)

A couple of notes:  First, the figures Henry posted are for 1000 feet,
so at 1.2dB/100 feet at 4MHz, that's not great, but at least isn't
terrible.  It's about the same as RG-58, and about what I'd expect for
small conductor diameters!  If you want low loss, plan on using large
conductors and/or high impedance... and if you are operating at high
impedance (large spacing), you better be careful about using good
insulation.

Second, generally in the HF region and well up into VHF and even UHF,
loss for decent line is dominated by the resistance of the conductors.
Because the resistance is determined by the conductor diamter and
the skin effect (unless the conductors are _really_, _really_ small
diameter!), the loss in dB will double for every multiplication by 4
of the operating frequency -- or more generally, will multiply by the
square root of the frequency ratio.  You can use this as a test to
see if some other loss mechanism is overtaking the loss due to conductor
resistance.  For example in the table above, you'd expect the loss at
20MHz to be sqrt(20) or about 4.5 times the loss at 1MHz.  It's a
little more than that, but not grossly.  And at 100MHz, you'd expect
ten times the dB loss, and again, that's pretty close.  So I'd conclude
that this line really is made well enough that it could be used up to
100MHz, if you can stand the loss.

--
Cheers,
Tom
[e-mail]


From Unknown Fri Jan 05 11:41:43 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news.cerf.net!ni1.ni.net!xband.ni.net!user
From: [e-mail] (J. L. Blanton)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Why free space pathloss ?
Date: Wed, 03 Jan 1996 23:09:08 -0800
Organization: Network Intensive
Lines: 24
Message-ID: <[e-mail]>
References: <4bp72a$[e-mail]> <[e-mail]>
NNTP-Posting-Host: xband.ni.net

> Danie Brynard wrote:
> >
> > Why is the free space path loss different for different frequencies
> > ? Thus every time you double the frequency the pathloss increase by
> > 6dB. I know what the mathematical formulae say but can somebody
> > just give a plain gutfeel common sense answer for this dummy ?

I think the term 'path loss' is very misleading.  Part of it (the
frequency-independent part) is due to the power spreading out in space as
it moves away from the transmitter.  The other part, which varies with
frequency, has more to do with the receiving antenna, as there seems to be
an assumption of constant antenna gain versus frequency.  That is, as the
frequency increases the aperture area must be reduced to maintain a
constant receive gain value.  Reducing the capture area of the receive
antenna reduces the power intercepted.  This may lead to the higher 'path
loss' figures at higher frequencies.

To add further to the confusion, 'path loss' does NOT include absorption
losses due to the propagation medium, which are often
frequency-dependent.  These losses must be accounted for separately.

Regards,

Lee, WA8YBT/6


From Unknown Fri Jan 05 11:41:45 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!NewsWatcher!user
From: [e-mail] (Henry Baker)
Subject: Re: Arrival angles
Message-ID: <hbaker-0301961526170001@10.0.2.15>
Sender: [e-mail]
Organization: nil organization
References: <4ceu31$[e-mail]>
Date: Wed, 3 Jan 1996 23:26:17 GMT
Lines: 17

In article <4ceu31$[e-mail]>, [e-mail] (Joe
Bulger) wrote:

> Does anyone know of an antenna that is used to measure arrival angles of
> HF signals? I would like to be able to readout arrival angles of signals
> on 160M.

I hope you have a large lot...

--
www/ftp directory:
ftp://ftp.netcom.com/pub/hb/hbaker/home.html

Copyright (c) 1996 by Henry G. Baker.  All rights reserved.
** Warning: Due to its censorship, CompuServe and its subscribers **
** are expressly prohibited from storing or copying this document **
** in any form.                                                   **


From Unknown Fri Jan 05 11:41:46 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!sloth.swcp.com!usenet
From: [e-mail] (Brett Coningham AB5P)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: LPDA dimensions anyone?
Date: Wed, 03 Jan 1996 23:53:03 GMT
Organization: Southwest Cyberport
Lines: 23
Message-ID: <4cf1gg$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ppp39.swcp.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:

>Anybody know the element dimensions for a 5-element 10/12/15/17/20m
>Log Periodic Dipole Array.  I have one but not too interested in climbing
>the tower to measure right now - and I have a South American contact who
>is eager to build one.

>post or email to [e-mail] - KD3XR - W F Sill, Tunkhannock, PA

>thanks

I wrote a DOS program, based on the ARRL equations, to design LPDA's.
Anyone  can have a copy, FREE, by accessing this URL:
http://www.swcp.com/~ab5p/software.htm

Hope it helps.
Brett


[e-mail]
Albuquerque Transmitter Hunting Homepage:
     http://www.swcp.com/~ab5p/foxhunt.html



From Unknown Fri Jan 05 11:41:47 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!sloth.swcp.com!usenet
From: [e-mail] (Brett Coningham AB5P)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: VHF/UHF Log Periodic
Date: Wed, 03 Jan 1996 23:53:05 GMT
Organization: Southwest Cyberport
Lines: 22
Message-ID: <4cf1gi$[e-mail]>
References: <c1d7cb$1714b.2e5@NEWS>
NNTP-Posting-Host: ppp39.swcp.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Glenn Thorn) wrote:

>Has anyone seen, have, or heard of any plans for a VHF/UHF log
>periodic?  Any software?

>Thanks,

>de Glenn, KE3MF

I wrote a DOS program based on the ARRL equations.
Anyone can have a copy FREE by accessing this URL:
http://www.swcp.com/~ab5p/software.htm

I hope it helps.
Brett



[e-mail]
Albuquerque Transmitter Hunting Homepage:
     http://www.swcp.com/~ab5p/foxhunt.html



From Unknown Fri Jan 05 11:41:48 1996
Path: news.epix.net!news.sprintlink.net!hermes.is.co.za!news.pix.za!usenet
From: [e-mail] (Paul Clifford)
Newsgroups: rec.radio.amateur.antenna
Subject: PC antenna prog?
Date: Thu, 04 Jan 1996 00:39:16 GMT
Organization: PiX - Proxima information X-change
Lines: 14
Message-ID: <4cflpf$[e-mail]>
NNTP-Posting-Host: net-10.pix.za
X-Newsreader: Forte Free Agent 1.0.82

Can anyone recommend an antennea design program that is PC based and
if so where can I find a copy. Perhaps you would be so kind as to
attach it to an E-Mail message for me.

Many thanks.

All The Best,

Paul Clifford

[e-mail]
[e-mail]
Music And Mail BBS (Fidonet 5:7101/68)



From Unknown Fri Jan 05 11:41:49 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!miwok!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!news.av.qnet.com!ibbs!js
From: [e-mail] (Jeff Stillinger)
Subject: Re: best "penetrating oil"???
X-Newsreader: TIN [version 1.2 PL2]
Organization: Coffee Radio Difference Committee
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Date: Thu, 4 Jan 1996 06:12:12 GMT
Lines: 36

WB3U ([e-mail]) wrote:
:    [e-mail] (Louise Carkenord) wrote:

: >I know there are some true "penetrants" out there.....something
: >way beyond WD-40.  What have you people had good success with??
: >Please be very specific.

: Back when I was involved in auto racing, I probably tried everything
: on the market at one time or another.  In all honosty, I never found
: anything that I thought actually did a better job than WD-40.  Most
: of it *said* it did, but you couldn't prove it by my results.

: The real trick to disassembling stuck metal parts is to use a
: combination of oil and heat.  After letting the WD-40 soak in for a
: day or so, a propane or acetylene torch can be used to heat the parts.
: The expansion and contraction of the metal nearly always breaks the
: two pieces apart with very little effort.  Naturally, you have to use
: the type of torch and the amount of heat that's appropriate for the
: job.  Tempered steel parts should be heated as little as possible, and
: an acetylene torch should not be used on aluminum unless the item is
: large and conducts the heat away very rapidly.

: Best of luck in your project.

: 73,
: Jack  WB3U

Liquid Wrench works well.

--
---------------------------------------------------------------------------
Jeff Stillinger - KB6IBB                              [e-mail]
PSC Box 3429                                          [e-mail]
Edwards AFB, CA  93524                                [phone]N1
      Flight Test Center, crashing aircraft so you don't have too.
---------------------------------------------------------------------------


From Unknown Fri Jan 05 11:41:50 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Arrival angles
Date: 4 Jan 1996 08:40:04 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <4cglbk$[e-mail]>
References: <4ceu31$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4ceu31$[e-mail]>, [e-mail] (Joe
Bulger) writes:

>
>Does anyone know of an antenna that is used to measure arrival angles of
>HF signals? I would like to be able to readout arrival angles of signals
>on 160M.
>
>
>
>

Hi Joe,

Try a loop or ferrite rod antenna. There are other antennas, but they are
more complicated and larger. One other method is to stack two antennas
vertically and adjust the phase difference between them to form a null. Or
to build a complicated receiving system that measures the phase difference
of the signals from the stacked antennas.

73 Tom


From Unknown Fri Jan 05 11:41:51 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!feenix.metronet.com!news
From: ken brookner <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: 6 meter antennas ??
Date: Thu, 04 Jan 1996 09:22:56 -0600
Organization: Texas Metronet, Inc  (login info (214/705-2901 - 817/571-0400))
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: fw16.metronet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b4 (X11; I; Linux 1.2.13 i486)

i've ordered up a ten-tec transverter to build and am now wondering what
types of antennas are being used on 6 meters.  i'd prefer to build
something and i don't have room for a big yagi.

suggestions?

thanks!

ken brookner, n5lpi
[e-mail]


From Unknown Fri Jan 05 11:41:52 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!tank.news.pipex.net!pipex!oleane!in2p3.fr!swidir.switch.ch!serra.unipi.it!news
From: Lapo Pieri <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Which type of antenna for 77.5 kHz ?
Date: 4 Jan 1996 10:27:04 GMT
Organization: Universita' di Pisa
Lines: 21
Message-ID: <4cga1o$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: embiolab.iroe.fi.cnr.it
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)


I use a 12cm long ferrite rod with a lot of AWG32 turn on it with a
variable capacitor; this "antenna" is followed by an op-amp preamp (it
use LM358) and than a VLF to 2m converter.
In my QTH (JN53OT) I got S7 signal on my IC211.
If I have sometime I can convert the schematic in electronic form.
73 de Lapo IK5NAX


-------------------------------------------------------------------------
Lapo  Pieri   IK5NAX                        internet:
[e-mail]
 @IROE-CNR  (Italy)
 Phone: [phone] (IROE)                packet:
[e-mail]
        [phone] (home)                          [TCP/IP]
44.134.208.174

-------------------------------------------------------------------------




From Unknown Fri Jan 05 11:41:53 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.rtsg.mot.com!merlin!usenet
From: Simon Saunders <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: HB9CV Info
Date: Thu, 04 Jan 1996 12:02:59 -0800
Organization: University of Surrey
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: pr205-014.ecid.cig.mot.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)

Can anyone point me towards info on the HB9CV anywhere on the Net or
elsewhere ?  Reply by mail please.

Simon Saunders, G6FNE


From Unknown Fri Jan 05 11:41:53 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!chi-news.cic.net!newsfeed.internetmci.com!usenet
From: [e-mail] (Drew)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Anyone seen radio.zip?
Date: 4 Jan 1996 12:18:44 GMT
Organization: Parrett Business Machines
Lines: 28
Message-ID: <4cggj4$[e-mail]>
References: <4cdjio$[e-mail]>
NNTP-Posting-Host: dialin4.parrett.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

In article <4cdjio$[e-mail]>, [e-mail] says...
>
>I'm not quite sure if it's been distributed around much, but I almost got
>all of radio.zip off a net.friend tonite, and I really wanna get hold of
>it!
>
>It was supposed to have instructions for making antennas out of stuff from
>around the home, so it'd be cheap to put together a good antenna.
>
>Anyone got it? I think it's around 400K or so long.
>
>thanks,
>
>-- carlo
>
You might try one of these:

ftp://ftp.netnet.net/pub/mirrors/truespace/incoming/radio.zip
ftp://ftp.cc.utexas.edu/depts/lbj-cbg/radio.zip

Drew
--
************************************************************
I have a quote in mind, I just can't remember how it goes...
[e-mail]                 Drew Menser
http://www.parrett.net/~dmenser     Bridgman, Michigan USA
************************************************************



From Unknown Fri Jan 05 11:41:55 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!li.net!bbruhns
From: [e-mail] (Bob Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Poor Stereo Reception Local?
Date: 4 Jan 1996 12:50:42 GMT
Organization: LI Net (Long Island Network)
Lines: 13
Message-ID: <4cgif2$[e-mail]>
NNTP-Posting-Host: linet04.li.net
X-Newsreader: TIN [version 1.2 PL2]

  Uh, I just remembered that channel 13 does come from the World Trade
Center.  I suspect all TV stations around Manhattan come from there, but
maybe not.

  It's also just possible that you are near communications radio
transmitters, although I would expect them to drop off the air from time
to time.  But if you're near a whole nest of them, it might be the
problem.  You would then need an FM bandpass filter; I don't know who
makes any, maybe Channel Master?  I don't recall any in the Radio
Shack catalog.

  Bob Bruhns, WA3WDR, [e-mail]



From Unknown Fri Jan 05 11:41:56 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: E-mail request
Date: 4 Jan 96 13:12:07 GMT
Organization: ucsd usenet gateway
Lines: 47
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


From:
Dale Green
Webular Communications
Chico, California

I'd like to send you a brief message, about twice a week,
about a category you have an interest in.

The messages are brief and to the point: information about a
product or service of outstanding value or interest to you.

If you want to receive mail:
DELETE THE CATEGORIES YOU DO NOT WANT AND E-MAIL BACK TO US.
Leave the categories you do wish to receive.
You may receive as many as you want.

****************************************
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*****************************************

If you do not want to receive these messages do nothing more.
Do NOT return this mail and you will not receive E-mail.

Please do not make comments on this page.
It will be processed automatically and isn't read.
However I would welcome your comments,
send them to [e-mail]

Sincerely,
President, Webular Communications


From Unknown Fri Jan 05 11:41:57 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news.telalink.net!uro!jackatak!root
From: [e-mail] (Jack GF Hill)
Subject: Re: Stupid transmission line
Organization: Jack's Amazing CockRoach Capitalist Ventures
Date: Thu, 4 Jan 1996 13:57:38 GMT
Message-ID: <[e-mail]>
References: <4cecnk$[e-mail]>
Sender: [e-mail] (generalized bbs login)
Lines: 34

[e-mail] (Terry Burge) writes:

> Twisted pair as in phone drop wire is twisted to prevent RF from
> traveling on it. In other words, it has inductors every so often
> to block the RF. Wouldn't exactly work to well for feeding RF don't
> you think?

Not exactly.... Actually, there are no "added" inductors, the
*induced* RF is choked off by virtue of the twists... think about this
for a moment:
if the wires were flat, like standard modular cable (regular
twin-lead) then RF *induced* on the wires would flow unimpeded.

However, the twist places the inducted field across the opposite wire,
by "re-inducing" the current in the opposing direction on the other
wire. For signal injected at one end, there is no problem -- if there
were, having a twist in ladderline woulkd render it worthless, and
many folks put a half-twist in every foot and a half or two feet, to
cancel out imbalances and induced currents...

That is why twisted pair works for long runs of telephone and why flat
cable is not a good choice for that application.

At least that's how it looks from here! ;^)
--
73,
Jack, W4PPT/M (75M SSB 2-letter WAS #1657/#1789 -- both from the mobile! ;^)

+--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+
| Jack GF Hill        |Voice: [phone] -             Ham Call: W4PPT |
| P. O. Box 1685      |Modem: [phone] -  Bicycling and SCUBA Diving |
| Brentwood, TN  37024|Fax:   [phone] -          Life Member - ARRL |
| [e-mail]  - "Plus ca change, plus c'est la meme chose" |
+--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+


From Unknown Fri Jan 05 11:41:58 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news.telalink.net!uro!jackatak!root
From: [e-mail] (Jack GF Hill)
Subject: Re: Mobile HF antenna efficiency?
Organization: Jack's Amazing CockRoach Capitalist Ventures
Date: Thu, 4 Jan 1996 14:04:44 GMT
Message-ID: <[e-mail]>
References: <4cebog$[e-mail]>
Sender: [e-mail] (generalized bbs login)
Lines: 33

Wayne Price <[e-mail]> writes:

> Are there "practical" equations for computing efficiency?  I asked this
> question before WRT calculating and measuring parameters on an OUTBACKER,
> and there were mixed opinions.
YES!

The simplest form is:

Efficiency = Rr/(Rr+Rg+Rl)
where:
Rr is radiation resistance (do *NOT* rely on the MFJ or Autek to give
this to you with any semblance of accuracy... for 160M or 80M the Rr
may be in 1/10 ohm! ;^)
Rg is ground return resistance, horrible in mobile applications
Rl is the actually resistance of the antenna system and loading
components

The efficiency then is the radiation resistance as a percent of total
resistance in the system

YMMV, especially in computing or measuring radiation resistance...
Good Luck! ;^)
--
73,
Jack, W4PPT/M (75M SSB 2-letter WAS #1657/#1789 -- both from the mobile! ;^)

+--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+
| Jack GF Hill        |Voice: [phone] -             Ham Call: W4PPT |
| P. O. Box 1685      |Modem: [phone] -  Bicycling and SCUBA Diving |
| Brentwood, TN  37024|Fax:   [phone] -          Life Member - ARRL |
| [e-mail]  - "Plus ca change, plus c'est la meme chose" |
+--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+


From Unknown Fri Jan 05 11:41:59 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!lll-winken.llnl.gov!overload.lbl.gov!agate!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!news.kei.com!sundog.tiac.net!usenet
From: <Unknown> (Aqualung)
Newsgroups: rec.radio.amateur.antenna
Subject: Am inside metal building
Date: 4 Jan 1996 14:34:51 GMT
Organization: The Internet Access Company
Lines: 6
Message-ID: <4cgoib$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 198.70.42.180
X-Newsreader: WinVN 0.92.6+

I am using a small clock radio inside of a space building (metal building)
and the reception on the station I'm trying to get is far less than clear.
Are there any easy solutions??

Regards!
Kenny


From Unknown Fri Jan 05 11:42:00 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: G5RV Reviews?
Date: Thu, 04 Jan 1996 16:14:54 GMT
Organization: Netcom
Lines: 8
Message-ID: <4cgjte$[e-mail]>
NNTP-Posting-Host: ix-wp1-14.ix.netcom.com
X-NETCOM-Date: Thu Jan 04  5:15:26 AM PST 1996
X-Newsreader: Forte Free Agent 1.0.82

I have just been give tne G5RV multi-band dipole as a Christmas gift.
Any reviews on this antenna?  Any hints?  There's too much snow on the
ground to hang it now...I'm dying to try it out.

73,

DE WB5PBJ



From Unknown Fri Jan 05 11:42:00 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!inet-nntp-gw-1.us.oracle.com!news
From: Craig Kall <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Attic TV Antenna
Date: 4 Jan 1996 16:39:20 GMT
Organization: Oracle Svenska AB
Lines: 7
Message-ID: <4cgvrp$[e-mail]>
References: <4bsbpi$[e-mail]>
NNTP-Posting-Host: kentucky.se.oracle.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

I live on an island off the Swedish west coast. Put a tv antenna in the
attic once but found it didn't give me the picture I wanted. I've got
concrete roofing tiles which really reduce signal strength when they're
wet.

- Craig        SM6JCD / WA4HNC



From Unknown Fri Jan 05 11:42:02 1996
Path: news.epix.net!news.sprintlink.net!hookup!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.cybercomm.net!raven.cybercomm.net!richg
From: [e-mail] (Rich Griffiths)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Satellite antennas and trees
Date: 4 Jan 1996 16:58:43 GMT
Organization: CyberComm Online Services
Lines: 20
Message-ID: <4ch103$[e-mail]>
References: <4c9bbu$[e-mail]>
NNTP-Posting-Host: raven.cybercomm.net
X-Newsreader: TIN [version 1.2 PL2]

Mark G. Wiltrakis ([e-mail]) wrote:
: I'm in the process of putting together a satellite station. I
: need some advice regarding location of antennas for 2M and 440:

: I have several siting options on my property, each with
: particular advantages and disadvantages. How important is
: having a "clear shot" at the satellite from the antenna?? How
: much of a factor on xmit/receive are trees in the near field,
: or at a distance (>100 feet)???

Trees make almost no difference at 146 MHz.  I don't know about 440, but
the attenuation by foliage goes up with frequency and is very high above
1 GHz.

------------------------------------------------------------------
  Rich Griffiths               |  W2RG  Monmouth County  FN20wi
  Red Bank, New Jersey         |  [e-mail]
 "It takes all the running you can do to keep in the same place."




From Unknown Fri Jan 05 11:42:03 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!crl.dec.com!caen!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!van-bc!unixg.ubc.ca!atha!rwa
From: [e-mail] (Ross Alexander)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Arrival angles
Date: 4 Jan 1996 17:38:05 GMT
Organization: Athabasca University
Lines: 16
Message-ID: <4ch39t$[e-mail]>
References: <4ceu31$[e-mail]> <hbaker-0301961526170001@10.0.2.15>
NNTP-Posting-Host: aupair.cs.athabascau.ca
X-Newsreader: NN version 6.5.0 #10 (NOV)

[e-mail] (Henry Baker) writes:

>In article <4ceu31$[e-mail]>, [e-mail] (Joe
>Bulger) wrote:

>> Does anyone know of an antenna that is used to measure arrival angles of
>> HF signals? I would like to be able to readout arrival angles of signals
>> on 160M.

>I hope you have a large lot...

I have 75 acres.  Please describe your technique.

Ross ve6pdq
--
Ross Alexander, ve6pdq  --  [phone]  --  [e-mail]


From Unknown Fri Jan 05 11:42:04 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news1!ts08-ind-20
From: [e-mail] (Patrick Croft)
Subject: Re: Small 40 Meter Yagi???
X-Nntp-Posting-Host: ts08-ind-20.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
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References: <[e-mail]>
Date: Thu, 4 Jan 1996 18:11:21 GMT
Lines: 19

[e-mail] (Ranson J. Pelt) wrote:
>I've seen the HW-40, a helincally (sp?) shortened yagi.  Can someone
>direct me to a small size 2-element yagi for 40 meters using loading
>coils???
>
>Tnx for the help.
>
>73
>
>--
>Ranson J. Pelt
>[e-mail]
>QST de nz4i

Ranson,
Suugest you consider the CushCraft 402CD.  Much can be found regrading beefing
 up the mechancial end,
and for what it is it's hard to beat.  Having wound various types of coils and
 applying copper tape for 'shorties',
I opt for modifiying a 'box' antenna.
GL  WB9IQI/Patrick


From Unknown Fri Jan 05 11:42:05 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.mind.net!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: David Stockton
Date: 4 Jan 1996 18:18:36 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 5
Distribution: world
Message-ID: <4ch5ls$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

To David Stockton:

Nice to hear your comments, David. I'm familiar with some of your writings.
Keep up the good (excellent) work.



From Unknown Fri Jan 05 11:42:06 1996
Path: news.epix.net!news.sprintlink.net!damage.usa1.net!news
From: [e-mail] ([e-mail])
Newsgroups: rec.radio.amateur.antenna
Subject: Equipment ground
Date: 4 Jan 1996 18:29:10 GMT
Organization: USAinternet, Inc.
Lines: 8
Message-ID: <4ch69m$[e-mail]>
NNTP-Posting-Host: wmn2-78.usa1.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

I have a cold water pipe in the shack which goes straight down
to the basement  to the outside underground. The telco uses this
for it's ground.  Is it better to run a ground line to a rod
which would be a longer run and end up being thinner cable than
the pipe ?  A friend say this is the way to go, I say the water
pipe is fine.  Remember this is not an antenna ground but rather
for the equipment.  What do you think ?



From Unknown Fri Jan 05 11:42:07 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!iglou!not-for-mail
From: [e-mail] (Steve Ellington)
Subject: Re: B&W Antennas
X-Nntp-Posting-Host: iglou
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Organization: IgLou Internet Services (1-800-436-4456)
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]
References: <4ch3pa$[e-mail]>
Date: Thu, 4 Jan 1996 19:08:19 GMT
Lines: 15

Yes. I had the 1.8 to 30 MC model. SWR was flat across the spectrum.
Radiation was terrible. I don't recommend it.


Jasper ([e-mail]) wrote:



: Anyone have experience in using any of the B&W folded dipole
: types of antennas ?  They have different models for multi-band
: use. Your comments on any model is appreciated.   Jasper
:

--
Steve Ellington [e-mail]  Louisville, Ky


From Unknown Fri Jan 05 11:42:08 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: 4 Jan 1996 19:18:00 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 27
Distribution: world
Message-ID: <4ch958$[e-mail]>
References: <4c6i7c$[e-mail]> <[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In article <[e-mail]>,
WB3U <[e-mail]> wrote:

>Congratulations!  Now you can share your stories of melted coax
>and arc'd tuner parts with the rest of us victims.  I love QRO!!!

I've already smoked some 6kv disc ceramics. Looks like mica, door-
knobs, or vacuum caps are the way to go with QRO.

>I thought the SB-200/201 series used a toroidal pickup?  No?

It uses a small slotted line directional coupler.

>...  The 3:1 limitation
>is the result of concerns for the increased voltage at the output
>circuitry of the amplifier, not the matching range of the Pi.

Let's say the amp has a 5k ohm output impedance and the pi-network
matches that 5k ohm impedance. Does the voltage across the first
cap increase as the load deviates up and down from 50 ohms? Or just
as the load deviates up from 50 ohms? If you hang a 100 ohm dummy
load on a properly tuned amp, there are no reflections, yet the
SWR meter reads 2:1. Same for a 25 ohm dummy load. Does the output
voltage increase in both these cases? I don't remember much about
tubes - hard to get a million of them on a chip. :-)

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Fri Jan 05 11:42:09 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!newsfeed.internetmci.com!in2.uu.net!lsi.lsil.com!up10_75!mforbes
From: [e-mail] (Mark Forbes)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: 4 Jan 1996 19:24:27 GMT
Organization: LSI Logic Corporation
Lines: 5
Distribution: world
Message-ID: <4ch9hb$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 147.145.10.75

A quick and dirty way to check RF lossiness is to put a small portion of the m
aterial in a microwave oven for, say, 30 seconds. Lossy material will heat up
significantly, while more RF compatible material will remain cool. You'll find
 that ABS plastic (The black stuff) is less lossy at higher frequencies than P
VC. As stated, PVC is perfectly acceptable at HF, but becomes more lossy at VH
F and above.

Mark Forbes, KC9C
---
Mark Forbes             ext. None


From Unknown Fri Jan 05 11:42:10 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Difference between Voltage & Current balums
Date: 4 Jan 1996 19:55:57 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 7
Distribution: world
Message-ID: <4chbcd$[e-mail]>
NNTP-Posting-Host: tboza.ch.intel.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

What physically makes up the difference in determining if a torriod
balum is a voltage and current type? Is it with the methode used in
winding the wire/coax onto a torrid? If so, what are the two differnet
methods?

WB7ASR...



From Unknown Fri Jan 05 11:42:11 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!bwoodsch.demon.co.uk
From: Phil Marshall <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Noise rejection
Date: Thu, 04 Jan 96 20:06:42 GMT
Organization: beechwood
Lines: 17
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: bwoodsch.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: bwoodsch.demon.co.uk

I am interested to know if there is a basic simple antenna type or technique
which will improve the rejection of local man made noise. I have read that
1/4 wave verticles are poor in this respect but maybe this is due to their
omnidirectional reception properties. Therefore, if this basic type is
considered poor, is there a mechanism for noise rejection that I am not aware
of.
So far, I have tried random wire (unbalanced and via a step down transformer),

dipoles, triangles and other loops. In every case the unbalanced random wire
seems to be the most successful at rejecting various sources of noise which
appear to be in my area and when present, which is often, plagues the entire
HF bands from 1.8 to 30MHz.
I have tried balanced feeds/baluns with the dipoles etc but this does not
seem to improve the noise rejection.
Can anyone please help or offer any theory on this subject ?
--
Phil Marshall


From Unknown Fri Jan 05 11:42:12 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!howland.reston.ans.net!ix.netcom.com!news3.noc.netcom.net!zdc!zippo!usenet
From: "Jason R. Rieg" <[e-mail]>
Subject: NEC4
Content-Type: text/plain; charset=us-ascii
Sender: [e-mail]
Content-Transfer-Encoding: 7bit
Nntp-Posting-Host: jrieg.bpd.harris.com
Organization: Harris Corporation
Message-ID: <[e-mail]>
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
Mime-Version: 1.0
Date: Thu, 4 Jan 1996 20:18:20 GMT
Lines: 11

Can anyone tell me how I can get my grubby little hands on a copy of NEC4?

Thanks.

--
| Jason Robert Rieg             | "listen: there's a hell of a |  ___   __o
|
| Antenna Electrical Engineer   |  good universe next door;    | ___  _`\<,_
|
| Harris Corp. / Broadcast Div. |  let's go."                  | ___ (*)/ (*)
|
| [e-mail]              |             - E.E. Cummings  | ^^^^^^^^^^^^
|




From Unknown Fri Jan 05 11:42:13 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!nntp-ucb.barrnet.net!cellnet.com!usenet
From: Jim <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 6 meter antennas ??
Date: 4 Jan 1996 20:43:26 GMT
Organization: CellNet
Lines: 48
Message-ID: <4che5f$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: smoke-2.cellnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1 (Windows; U; 16bit)

How about a single delta-loop?  I built a 10-meter version for field day a few
 years
ago using a triangle shape with two small aluminum tubes extending up and out
from
the feed point, connected by wire along the top.  The whole thing mounted to a

TV-style mast using a small 2x4 block of wood with tight-fitting 1/2" holes to
 hold
the aluminum tubing and a U-bolt to secure the whole thing to the mast.

         _____________  <- wire screwed to top of both aluminum tubes
         \           /
          \         /
           \       /   <- 1/2" aluminum tubing
            \     /
             \   /
             _\_/_
            |_____|   <- 2x4 wood block
              | |
              | |
              | |   <- TV-style mast
              | |


It wasn't very big, and a 6-meter version would be even smaller.  I used a 1/4
-wave
impedance tramsforming piece of 75-ohm RG-59 (since the loop has a nominal 100
-ohm
impedance), but you could probably use any old 50-ohm coax and it would work j
ust as
well.

Unfortunately, the band was pretty dead that field day.  We worked all the loc
al
novices, and we got a little bit of short skip.  But all in all, it seemed to
work
pretty well, for its size.

Hope that helps.

Cheers.
Jim DeLoach, WU0I


ken brookner <[e-mail]> wrote:
>i've ordered up a ten-tec transverter to build and am now wondering what
>types of antennas are being used on 6 meters.  i'd prefer to build
>something and i don't have room for a big yagi.
>
>suggestions?
>
>thanks!
>
>ken brookner, n5lpi
>[e-mail]




From Unknown Fri Jan 05 11:42:15 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!harbinger.cc.monash.edu.au!lugb.latrobe.edu.au!ecsclfe
From: [e-mail] (ENRIQUEZ Luke)
Newsgroups: rec.radio.amateur.antenna
Subject: YAGI QUESTION : Changing Resonance..
Date: 5 Jan 1996 00:02:20 GMT
Organization: La Trobe University
Lines: 74
Message-ID: <4chpqc$[e-mail]>
NNTP-Posting-Host: lux.latrobe.edu.au
X-Newsreader: TIN [version 1.2 PL1]

Howdy,
        I have a 2-meter beam, home made by someone (not by me). It has
5 elements (1 ref, 1 DE, 3 dir) and a gamma match. I am having VSWR
problems above 146 Mhz. The antenna has a 1:1 VSWR at 144 Mhz. I do not
know much about yagi antennas, but I want to have a VSWR of 1:1 at
147Mhz, not 144Mhz. I decided to ask a few people, and I got 3 different
answers :

        1.) Adjust the Gamma match.
        2.) Make a new beam.
        3.) Move the last director closer to the DE (by an inch or two).

        I then decided that I should simulate the yagi with a program.
To get a better picture, I used two programs. YAGIMAX 3.11 and Yagi
Optmizer.

Yagi Optmizer Results :

        At 147 Mhz :

                Forward Gain : 8.56dBd
                F/B Backlobe : 20.11 dB
                Input Imped. : 24.1-j19.7
                SWR          : 1.04SWR

        This is before the gamma match.

        At 144 Mhz :

                Input Imped. : 25.2-j37.5

        At 146 Mhz :

                Input Imped. : 24.5-j26.1

        At 148 Mhz :

                Input Imped. : 23.9-j12.7

From Yagimax 3.0 :

        At 144 Mhz : Input. Imped. : 23.76-j16.24
        At 146 Mhz : Input. Imped. : 23.76-j16.24
        At 148 Mhz : Input. Imped. : 24.42-j0.68

        Normalized Radiation Resistance at 145.00 Mhz is 45.96 Ohms
            "          "          "      " 147.00 Mhz is 27.07 Ohms


Here are my questions :

        Is it going to be too hard to make this beam VSWR 1:1 or close
at 147 Mhz. As I said, people are telling me all different things but
I've concluded all I need to do is adjust the gamma match. I have not
tried to adjust or fiddle with the gamma match yet. Some people said if
the beam was designed for 144Mhz then it would not be worth playing with
the gamma match. From what I can see, the beam is not designed for 144
Mhz. I've concluded this since as the freq. increses, the reactance
decreases. However, the Normalized radiation resistance tells me that
the beam has been designed for 145 Mhz.  Can someone please help me and
explain to me, what I can do?

Regards,
Luke
--
---------------------------------------------------------------------------
   Luke Enriquez, Dept. Electronic Engineering. LaTrobe University, Aust.

                 "Life is like a pubic hair on a toilet seat.
                       Someone is bound to piss you off"

                       [e-mail]
---------------------------------------------------------------------------



From Unknown Fri Jan 05 11:42:16 1996
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!news.paonline.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Equipment ground [sig.txt] (1/1)
Date: 5 Jan 1996 04:53:34 GMT
Organization: Pennsylvania Online [Usenet News Server for Hire]
Lines: 10
Message-ID: <4ciase$[e-mail]>
References: <4ch69m$[e-mail]>
NNTP-Posting-Host: 206.25.244.98
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

begin 644 SIG.TXT
M(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C
M(PT*5F5R;F]N($HN($MU;F5S+"!*<BX@(")4:&4@36%N('=H;R!W;W5L9`T*
M,3$T,"!2=&4@,S8T("`@("`@("`@("!B92!+:6YG(&]F($UI9&1L97-E>"(-
M"DUI9&1L97-E>"P@3ED@,30U,#<@("`H8G5T('1H97D@=V]N)W0@;&5T(&AI
M;2$I#0IE;6%I;"!A="!V:FMU;F5S:G)`<W!A8V5T96-H+F-O;0T*<F%D:6\@
M8V%L;"!S:6=N($XR65I3#0HC(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C(R,C
2(R,C(R,C(R,C(R,C(R,C(R,C
`
end


From Unknown Fri Jan 05 11:42:17 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (ARIS KAPONIDES)
Newsgroups: rec.radio.amateur.antenna
Subject: (no subject)
Date: 5 Jan 96 05:57:51 GMT
Organization: SpiderNet
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I would like to be on your list.
Thank you
de Aris-5B4JE




From Unknown Fri Jan 05 11:42:18 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: Fri, 05 Jan 1996 06:13:35 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 70
Message-ID: <4cifk9$[e-mail]>
References: <4c6i7c$[e-mail]> <[e-mail]> <4ch958$[e-mail]>
NNTP-Posting-Host: usr3ip3.azstarnet.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Cecil A. Moore~) wrote:

>In article <[e-mail]>,
>WB3U <[e-mail]> wrote:

>>Congratulations!  Now you can share your stories of melted coax
>>and arc'd tuner parts with the rest of us victims.  I love QRO!!!

>I've already smoked some 6kv disc ceramics. Looks like mica, door-
>knobs, or vacuum caps are the way to go with QRO.

>>I thought the SB-200/201 series used a toroidal pickup?  No?

>It uses a small slotted line directional coupler.

>>...  The 3:1 limitation
>>is the result of concerns for the increased voltage at the output
>>circuitry of the amplifier, not the matching range of the Pi.

>Let's say the amp has a 5k ohm output impedance and the pi-network
>matches that 5k ohm impedance. Does the voltage across the first
>cap increase as the load deviates up and down from 50 ohms? Or just
>as the load deviates up from 50 ohms? If you hang a 100 ohm dummy
>load on a properly tuned amp, there are no reflections, yet the
>SWR meter reads 2:1. Same for a 25 ohm dummy load. Does the output
>voltage increase in both these cases? I don't remember much about
>tubes - hard to get a million of them on a chip. :-)

Why don't you look at it this way:
The function of the pi network is to take the impedance
appearing at the output spigot and transform it to a load
impedance into which the tube(s) can deliver the design
power.  (I will not rehash the conjugate match/dynamic
operating Z argument here.) Simultaneously, the tank must
have an operating (loaded) Q sufficiently high enough to
maintain the "flywheel" effect, but not so high as to limit
the efficiency from the loaded to unloaded Q ratio. Stray
tube capacitance, etc. can put limits on realizable Q.

If you plot a 3:1 SWR circle on a Smith chart, you can
easily see that the value of the real (resistive) part of
the load can range from 16.67 to 150 ohm.  Knowing the
specified output power (more-or-less) of the amplifier, the
peak voltage across this resistance and hence across the
output capacitor can be calculated.  Obviously, the worst
case is at 150 ohm, where if my math is correct, the peak
voltage is 548 V at 1 KW output.  If the load SWR is truely
no greater than 3:1, then this is as bad as it gets.

Similarly, if the input side of the network is capable of
being adjusted such that it presents the desired resistive
(or nearly so) value to the tube(s) then the voltage swing
is again easily calculated. (Of course if you know the
supply voltage, it's even easier.) Because the input
capacitor is again in parallel with this equivalent
resistance, its voltage is also known. Note too that this
value is independant of the load Z.  Thus, I would surmise
that the 3:1 limitation is more a function of matching range
than of voltage breakdown.

The SWR metering circuit is calibrated at 50 ohm, so with a
100 ohm load it correctly displays a 2:1 SWR.  Remember that
inside the bridge, there is a short segment of 50 ohm line,
(or some 50 ohm reference)  so there is an internal
mismatch.

>73, Cecil, KG7BK, OOTC  (not speaking for my employer)

73, Wes -- N7WS



From Unknown Fri Jan 05 11:42:19 1996
Path: news.epix.net!peach.epix.net!will
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: G5RV Reviews?
Date: Fri, 5 Jan 1996 08:52:30 -0500
Organization: epix.net
Lines: 16
Message-ID: <[e-mail]>
References: <4cgjte$[e-mail]>
NNTP-Posting-Host: peach.epix.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4cgjte$[e-mail]>


On Thu, 4 Jan 1996 [e-mail] wrote:

> I have just been give tne G5RV multi-band dipole as a Christmas gift.
> Any reviews on this antenna?  Any hints?  There's too much snow on the
> ground to hang it now...I'm dying to try it out.

When I first got my ticket I worked the world with a G5RV and 100w. Good
all-bander. I worked a VK7 one AM for 1/2 hour.  A caution: the length
and/or arrangement of coax feeder affects how well it will load up on
different bands. (I assume you know a tuner is needed!)

I now have a so-called double-size G5RV so I can work 160, but frankly my
LPDA works so great I only use the wire below 20m.

[e-mail] - KD3XR - W F Sill, Tunkhannock, PA


From Unknown Tue Jan 09 18:19:58 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Lawrence Stoskopf)
Newsgroups: rec.radio.amateur.antenna
Subject: "Doty" in new article
Date: 9 Jan 96 13:45:57 GMT
Organization: ucsd usenet gateway
Lines: 53
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Just got the Jan 96 Radio Communications (RSGB) and was suprised to see in
Technical Topics (my favorite all time column) a lengthy review of VK1BRH's
article in Amateur Radio (Australia), Short Vertical Antennas and Ground
Systems.  Hawker reproduces one of Doty's ground conductivity figures from
QST.
He also refers to an article I've filed away and nearly forgotten: Using
Elevated Radials with Ground Mounted Towers by KB8I in Sept 91, pp 77-82 IEE
Trans on Broadcasting.  ".. it is possible to use four elevated radials
together with a conventional ground-mounted, base-insulated tower for MF
broadcasting purposes, and achieve the same level of performance which is
normally obtained from a classic 120-buried-radial system."  This from NEC
simulation.

Hawker, who has apparently been around for a long time, and as one of the
RSGB ladies at Dayton shared with me last year, has a great fund of
knowledge about ham radio, etc. adds:  "George Brown, it needs to be
stressed, was not adverse to elevated, artificial ground screen.  He was, in
fact, the inventor of the HF/VHF artificial ground-plane antenna.  He once
confessed to me over lunch that his original version used only two radials,
but to satisfy early police-radio customers this was increased to four
radials without significantly increasing radiation efficiency."  (My
comment...these were way up in the air)

Back to the Australian's comments:

"Do not place radials on or below the ground unless there is space for some
120 radials and the site has good ground conductivity;(with poor ground
conductivity it is useful regularly to water the ground!"

Hawker's final comments:

"VK1BRH emphasises that simulated results are only as good as the computer
program.  However he considers that NEC-81 is good at modelling linear
antennas close to lossy ground.  It has been validated numerous times but,
even so, it has failed even more times due to inappropriate use."

My wish list:

1.  A good review article going back to the original Brown articles.

2.  A meta-analysis of data already published.  (A technique in which you
combine a whole batch of statistically insignificant data to hopefully make
it statistically significant)

3.  A rework of the Doty model with corrections and field strength measurement
s.

Meanwhile, thanks to those who have added much reasoned info to this forum.



Lawrence E. Stoskopf, M.D.
N0UU



From Unknown Tue Jan 09 18:19:59 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!in1.uu.net!yrkpa.kias.com!usenet
From: [e-mail] (Richard L. Graham)
Newsgroups: rec.radio.amateur.antenna
Subject: "No Radial" Verticals?
Date: Fri, 05 Jan 1996 23:01:41 GMT
Organization: Keystone Information Access Systems
Lines: 18
Message-ID: <4ckal8$[e-mail]>
NNTP-Posting-Host: slip9.kias.com
X-Newsreader: Forte Free Agent 1.0.82

Hello all:

I am trying to do a comparison on the "No Radial"-type verticals.  My
situation is that I live in a row home with very little real estate.
I am forbidden from the XYL to put a vertical with radials on the
ground, etc., so my next best choice is to put something up on the
roof.  I presently have a 40m sloper and a Bilal 80m antenna, but the
Bilal doesnt perform that well, IMHO.  I am interested in getting on
80meters, so the R-5,R-7 antennas are out of the picture (Cushcraft,
why dont you make an R-8! :)

I am trying to compare GAP, Butternet, and the MFJ verticals.  If any
of you have any of these antennas, let me know how you like it and if
you have any other suggestions, I'd appreciate it.

73 DE KA3ESA, Rick




From Unknown Tue Jan 09 18:20:00 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!newsrelay.netins.net!news.netins.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: "No Radial" Verticals?
Date: 6 Jan 1996 03:12:44 GMT
Organization: INS Information Services, Des Moines, IA USA
Lines: 32
Message-ID: <[e-mail]>
References: <4ckal8$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ins.netins.net

In article <4ckal8$[e-mail]>, [e-mail] (Richard L. Gra
ham) writes:
>Hello all:
>
>I am trying to do a comparison on the "No Radial"-type verticals.  My
>situation is that I live in a row home with very little real estate.
>I am forbidden from the XYL to put a vertical with radials on the
>ground, etc., so my next best choice is to put something up on the
>roof.  I presently have a 40m sloper and a Bilal 80m antenna, but the
>Bilal doesnt perform that well, IMHO.  I am interested in getting on
>80meters, so the R-5,R-7 antennas are out of the picture (Cushcraft,
>why dont you make an R-8! :)
>
>I am trying to compare GAP, Butternet, and the MFJ verticals.  If any
>of you have any of these antennas, let me know how you like it and if
>you have any other suggestions, I'd appreciate it.
>
>73 DE KA3ESA, Rick
>
>
Rick:
I have used a GAP Challenger for about 3+ years. (Its currently down since I j
ust
made a move to the country.) If you're looking for 80 meter work I don't think
 I'd
recommend the GAP. I have not personally had any experience with the other GAP
 line
but I haven't heard anything better than lukewarm comments about thier 80 mete
r
coverage. I had poor results using my antenna on 80. I did have good results w
ith it
on 40 and 20 and thats what's most GAP users have told me also. I worked a lot
 of Dx
just in the last few years using 3 watts. I too couldn't get any radials out s
o I
was glad to have an antenna that worked anything! But on 80 its a dud.Maybe so
meone
who has used the TITAN or the VOYAGER could tell of thier experience. Mine was
mechanically very sound in the face of lots of ice. If you can't get some radi
als
down you may want to consider your other options.
Good luck! WB0FDJ


From Unknown Tue Jan 09 18:20:01 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (C. J. Hawley Jr.)
Newsgroups: rec.radio.amateur.antenna
Subject: (no subject)
Date: 6 Jan 96 05:13:39 GMT
Organization: University of Illinois, Urbana-Champaign
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

add [e-mail] Chuck


From Unknown Tue Jan 09 18:20:02 1996
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From: Bud Simmons <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: (no subject)
Date: 8 Jan 1996 16:10:04 GMT
Organization: LATG DSE
Lines: 4
Message-ID: <4crfks$[e-mail]>
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Does anyone have any experience with the MFJ multi-band hf antennas?
Good or bad?




From Unknown Tue Jan 09 18:20:03 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: /PN=Scott.C.Werling/O=wallace/PRMD=iadps/ADMD=attmail/C=us/@safe.ia.GOV
Newsgroups: rec.radio.amateur.antenna
Subject: (none)
Date: 8 Jan 96 16:55:23 GMT
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Message-ID: <[e-mail]>
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Originator: [e-mail]

>From /PN=Scott.C.Werling/O=wallace/PRMD=iadps/ADMD=attmail/C=us/ Mon Jan 8 11
:00:50 CST 1996 remote from osiint.safe.ia.gov
Date: 08 Jan 1996 10:56:55 -0600
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        arrival 08 Jan 1996 10:56:55 -0600
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ia.gov
To: "/RFC-822=Ham-Ant(a)UCSD.EDU/OU=OSI-INTERNET/O=WALLACE/PRMD=IADPS/ADMD=ATT
MAIL/C=US/"@osiint.safe.ia.gov
In-Reply-To: <"\"/RFC-822=199601061230.EAA24761(a)mail.ucsd.edu/OU=OSI-INTERNE
T/O=WALLACE/PRMD=IADPS/ADMD=ATTMAIL/C=US/\""@osiint.safe.ia.gov>
Subject: Re: Ham-Ant Digest V95 6658
Importance: normal
Autoforwarded: FALSE
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tmail/C=us/@osiint.safe.ia.gov>
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> Those antennas don't perform particularly well on 15/10M.  Are you
> using a balun where the coax connects to the ladder line?
>
> 73,
> Jack  WB3U
>
Hi Jack, being new to building antennas and HF so this has been a real
learning experience for me.  I don't have a balun in my line.  Should I have
one there?  If so is there any specific kind I should use or look for?  Is
it something I could build or should I go with a store bought unit?  My tech
expertise is very limited.  My antenna SEEMS to do pretty well on 10/15.
Made a 15 m contact on CW Iowa to San Diego CA.  But maybe the band was open.
Any help appreciated.

Scott
[e-mail]



From Unknown Tue Jan 09 18:20:04 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!uhog.mit.edu!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!s169.phxslip4.indirect.com!user
From: [e-mail] (Eric Brombaugh)
Newsgroups: rec.radio.amateur.antenna
Subject: 2-meter Log-Periodics - Why not a TV antenna?
Date: Sat, 06 Jan 1996 21:11:12 -0700
Organization: Internet Direct, Inc.
Lines: 29
Message-ID: <[e-mail]>
NNTP-Posting-Host: s169.phxslip4.indirect.com

Okay, I've got on my asbestos underwear.  Why not use a TV antenna
for 2-meters?

Most conventional TV antennas are Log-Periodic designs that cover
both the VHF and UHF bands.  VHF TV being from 54 MHz to above 170 MHz,
the 2-meter band seems to fall right into that range.

Granted:
   TV antennas are much broader band than you really need for 2-meters,
   so you might be able to get better performance from a design just
   for Ham use.
and
   TV systems are usually 75 ohm, not 50.

But:
   TV antennas can be had very cheap.
and
   75 ohms into a 50 ohm system is only a 1.5:1 VSWR - not bad really.

So - why not?

Eric Brombaugh KC7GXA
[e-mail]  (work)
[e-mail] (home)

--
Eric Brombaugh    KC7GXA
[e-mail] (home)
[e-mail]   (work)


From Unknown Tue Jan 09 18:20:05 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!news.cerf.net!ni1.ni.net!xband.ni.net!user
From: [e-mail] (J. L. Blanton)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 2-meter Log-Periodics - Why not a TV antenna?
Date: Sun, 07 Jan 1996 10:45:32 -0800
Organization: Network Intensive
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: xband.ni.net

> In article <[e-mail]>
[e-mail] (Eric Brombaugh) writes:
> >Why not use a TV type (Log Periodic) Antenna for 2m?

VHF TV is divided into two bands: 54-88 MHz (channels 2-6) and 174-216 MHz
(channels 7-13).  Some TV antennas utilize dedicated (sometimes
interleaved) log-periodic structures for the separate bands.  Sometimes a
log periodic structure is designed for the lower band and used in its 3rd
harmonic mode on the upper band.  It is not a given that a TV antenna will
provide coverage of the 144-148 MHz band.  Some designs may provide
marginally acceptable performance while others may not.  If you try using
a TV antenna for 2m remember that most TV antennas hav a feedpoint
impedance of 200-300 ohms and require a 4-to-1 balun to get to 75 ohms.

Lee, WA8YBT


From Unknown Tue Jan 09 18:20:07 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netcom.com!ghiscox
From: [e-mail] (George L. Hiscox)
Subject: Re: Antenna Simulation Software
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: Forte Free Agent 1.0.82
References: <[e-mail]>
Date: Sun, 7 Jan 1996 01:48:31 GMT
Lines: 31

[e-mail] (Wendy Wing Chi Cheung) wrote:

>Hi!
>       I have a question about antenna simulation programs in
>general.   Does anyone here collect information about most of the
>antenna simulation programs that exist?

Wendy,

I went through such a survey this past summer when selecting antenna
modeling software for my personal use.   I settled upon the EZNEC
software written by Roy Lewallen, W7EL, based upon the response I got
from my survey here on the Internet.

EZNEC is based on NEC-2, as is the antenna modeling software by Brian
Beezley,  K6STI.  Comments from those responding to the survey
indicated that EZNEC was much more user friendly and that the
customers of the EZNEC/W7EL software received better support from the
author.

I have found EZNEC to be very flexible and easy to use.  The manual is
very well written and easy to follow. I recommend it to you without
reservation.

George


| George L. Hiscox    | When I die I want to go quietly in   |
| [e-mail]  | my sleep like my grandfather,  not   |
| WA6RIK @ WB6YMH     | screaming like the people in his car.|



From Unknown Tue Jan 09 18:20:08 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!news.interlog.com!winternet.com!news
From: sholisky <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Attic TV Antenna
Date: 6 Jan 1996 05:45:35 GMT
Organization: StarNet Communications, Inc
Lines: 14
Message-ID: <4cl29v$[e-mail]>
References: <4bsbpi$[e-mail]> <4cgvrp$[e-mail]>
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To: [e-mail]
X-URL: news:4cgvrp$[e-mail]

Craig - One of my duties at the local public tv station is to answer
questions like yours. True enuff a attic antenna is free from some of
the effects of weather, but is subject to sever mistuning by way of the
many things that are close to it. ( wires, building material,etc...) The
advice I give to most all viewers is to put the antenna "on the roof".
This may mean a simple installation, but most of all, a location that is
in the free and clear of obsticals. Coax and a good tape job are in
order as well.

Regards - Scott WB0ATR

Ps - you might wanna check out "ktca.org" for a few more hints.




From Unknown Tue Jan 09 18:20:09 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.compuserve.com!newsmaster
From: [e-mail] (Alberto Perello)
Newsgroups: rec.radio.amateur.antenna
Subject: BALUN TELREX
Date: Tue, 09 Jan 1996 19:26:25 GMT
Organization: CompuServe Incorporated
Lines: 13
Message-ID: <4cufg2$[e-mail]>
NNTP-Posting-Host: ad51-208.compuserve.com
X-Newsreader: Forte Free Agent 1.0.82

Hello to all,

Any know where I can find the old bud good coaxial balun of Telrex
4K81B?.

Or similar?.

Thank you in advance.

Alberto Perello - Barcelona/Spain
EA3CR




From Unknown Tue Jan 09 18:20:10 1996
Path: news.epix.net!news.sprintlink.net!news.wwa.com!buffnet2.buffnet.net!usenet
From: [e-mail] (david james)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: best "penetrating oil"???
Date: 9 Jan 1996 00:32:43 GMT
Organization: BuffNET
Lines: 5
Message-ID: <4csd3b$[e-mail]>
References: <[e-mail]> <4ck22d$[e-mail]>
NNTP-Posting-Host: fppp5.buffnet.net
X-Newsreader: WinVN 0.92.2

In article <4ck22d$[e-mail]>, [e-mail] says:
>
>>AeroKroil is a good product. I use just plain Kroil and it is the best I hav
e ever found. Order it by the gallon.
>
Great .. So where do you get some ?


From Unknown Tue Jan 09 18:20:11 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in2.uu.net!in-news.erinet.com!ragnarok.oar.net!malgudi.oar.net!news.rcinet.com!sally.dma.org!millersg
From: [e-mail] (Steve Miller)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Butternut 80/40 Vertical Any Good?
Date: 9 Jan 1996 17:49:51 GMT
Organization: Dayton Microcomputer Association; Dayton, Ohio, USA
Lines: 20
Message-ID: <4cu9rv$[e-mail]>
References: <4c9df2$[e-mail]> <[e-mail]>
NNTP-Posting-Host: dmapub.dma.org

In article <[e-mail]>,
Nelson P. Moyer <[e-mail]> wrote:
>I have the HF2V mounted on the ground with an 8 ft. ground rod but no radials
.
>It's not the best setup but I've worked DXCC on 40 and 80 with it from Iowa.
>It's a bit noisy in town, especially on 80. The bandwidth on 80 is only about

>50 MHz but the coil is easy to adjust and I have marked the settings for phon
e
>and cw DX frequencies for rapid changes. The bottom insulator wears and has t
o
>be replaced in windy areas if you don't guy the antenna. I've replaced mine
>every 3-4 years. I like the HF2V better than the 5 to 8 band verticals that
>cover 40 and 80. I've used the HF6V and the old HyGain AVQ verticals. If you
>don't have room for a proper antenna on 40 or 80, the HF2V is the way to go.
>
>KU0A


You'll be much happier using the HF2V with radials!!!

--
Steve Miller  WD8IXE
[e-mail]


From Unknown Tue Jan 09 18:20:11 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!homer.alpha.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Diawa Rotor
Date: 8 Jan 1996 20:42:05 GMT
Organization: Alpha.net -- Milwaukee, WI
Lines: 5
Message-ID: <4crvit$[e-mail]>
NNTP-Posting-Host: port07.cornet.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

A friend of mine has a Diawa Rotorwhich was struck indirectly by lightning.
The model number of the rotor is MR-750PE and the controller model is CR-4P.
He is looking for a schematic for the controller or is looking to purchase a
controller .
If anyone has any info on this rotor please let me know at [e-mail]
.
Any help would be appreciated as this seems to be a very limited item..73  ..K
en NO9F


From Unknown Tue Jan 09 18:20:13 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Difference between Voltage & Current balums
Date: 5 Jan 1996 09:30:42 GMT
Organization: ELNEC/EZNEC Software
Lines: 19
Message-ID: <4cir42$[e-mail]>
References: <4chbcd$[e-mail]>
NNTP-Posting-Host: ip-pdx02-19.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   [e-mail] writes:
>  What physically makes up the difference in determining if a torriod
>  balum is a voltage and current type? Is it with the methode used in
>  winding the wire/coax onto a torrid? If so, what are the two differnet
>  methods?
>
>  WB7ASR...

It's kind of hard to describe without pictures. A 1:1 current balun has
only two windings and will show a D.C. open at the input if the output
is open. A 1:1 voltage balun has three windings and will show a D.C.
short at the input if the output is open. A 4:1 current balun has two
windings on each of two cores. A 4:1 voltage balun has three windings
on a single core. The differences in what they actually do are
explained in "Baluns: What They Do and How They Do It" in the ARRL
Antenna Compendium, Vol. 1.

Roy Lewallen, W7EL



From Unknown Tue Jan 09 18:20:14 1996
Path: news.epix.net!news.sprintlink.net!hookup!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Doty article once ag
Date: 6 Jan 1996 07:08:55 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 26
Sender: [e-mail]
Message-ID: <4cloon$[e-mail]>
References: <30ed7d5e.1438317@137.149.3.1>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <30ed7d5e.1438317@137.149.3.1>, [e-mail] (David  C.
Seeler) writes:

>True - but if the article claims to make a significant advance as
>opposed to being a "new vertical antenna " construction article,
>external review might be considered.  The delay may be worth it, if
>accuracy is established.  In my field, it is not uncommon for it to
>take up to 1 year to be published once the paper is submitted.  That,
>I do not like, but given the alternative, I guess I accept it at this
>time. On the other hand, if editors are concerned about getting papers
>into the journal - then perhaps there are not too many "piled" up and
>the delay would not be too outrageous?

Hi David,

That is precisely the area that worries me. The "new enlightment" articles
that offer a revolutionary theory that is in opposition to established
theory, or articles claiming to advance understanding with new insight
need careful review. Not articles about building dipoles or operating
skills. If it's a constuction article of a small piece of equipment, it
certainly could be submitted with the article and tested.

It's not every article that needs tough technical review, just the new
discoveries!

73 Tom


From Unknown Tue Jan 09 18:20:15 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uchinews!gw2.att.com!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Emergency 2M/70cm J-Pole 4sale
Date: Sun, 07 Jan 1996 19:50:11 GMT
Organization: Netcom
Lines: 20
Message-ID: <4cp8fi$[e-mail]>
NNTP-Posting-Host: ix-lou-ky1-26.ix.netcom.com
X-NETCOM-Date: Sun Jan 07 11:55:30 AM PST 1996
X-Newsreader: Forte Agent .99b.112


If you are interested in an emergency J-Pole antenna cut for the
2meter and the 70cm band, I will make one and mail it to you first
class mail.  The antenna is made of high quality 450ohm ladder wire
and is cleverly constructed to be rolled up and put into an emergency
bag and hung on a tree or Hotel ceiling.

If you are interested in one of my antennas, please send  10.95 plus
3.50 s/h to:

N2TRY Dave Evangelista
P.O. Box 22384
Louisville, KY 40252

Or if you have questions, please email me at:

[e-mail]





From Unknown Tue Jan 09 18:20:15 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip36.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Equipment ground
Date: Sun, 7 Jan 1996 20:30:46 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]> <4coqnb$[e-mail]>
NNTP-Posting-Host: usr4ip36.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4coqnb$[e-mail]> [e-mail] writes:
>From: [e-mail]
>Subject: Re: Equipment ground
>Date: 7 Jan 1996 16:00:43 GMT

>>   [e-mail] (Gary Coffman) writes:

[A whole bunch of GOOD STUFF deleted]

>The SOLE purpose of a station or equipment ground, is for RFI, nothing else.

You gotta be kidding!

BTW, does "for RFI" mean for generating RFI or preventing it?  Just curious.




From Unknown Tue Jan 09 18:20:16 1996
Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!news.ia.net!zeus.ia.net!kovar
From: [e-mail] (Jack Kovar  KE0AX)
Newsgroups: rec.radio.amateur.antenna
Subject: FS: 2 Hygain triband verticles
Date: 7 Jan 1996 23:26:35 GMT
Organization: InterAccess Networking
Lines: 14
Message-ID: <4cpkrb$[e-mail]>
NNTP-Posting-Host: zeus.ia.net
X-Newsreader: TIN [version 1.2 PL2]

        I have two hygain matching 10,15,20 meter verticles for phased or

        dipole config, Or independent. If someone would like them and lives

        in eastern Iowa, I will make a deal you can not refuse.

        I will be back home monday night.

                                        Thanks Jack Kovar
                                        Ke0ax
                                        [e-mail]
                                        Toddville, Ia.




From Unknown Tue Jan 09 18:20:17 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!news.islandnet.com!salmon!clinton.peebles
From: [e-mail] (Clinton Peebles)
Newsgroups: rec.radio.amateur.antenna
Subject: G5RV Reviews?
Date: Mon,  8 Jan 1996 13:26:00 GMT
Message-ID: <[e-mail]>
Organization: Salmon Siding Saloon BBS 604-357-9942
Distribution: world
References: <4cgjte$[e-mail]>
Lines: 15


L>I have just been give tne G5RV multi-band dipole as a Christmas gift.
L>Any reviews on this antenna?  Any hints?  There's too much snow on the
L>ground to hang it now...I'm dying to try it out.

Get it has high as you possibly can..
     ╔══════════════════════════════════════════════════════╗
     ║    Clinton Peebles  VE7-KNL                          ║
     ║    SYSOP - Salmon Siding Saloon BBS - 604-357-9942   ║
     ║    Internet: [e-mail]        ║
     ║              [e-mail]                     ║
     ║    Packet Radio: VE7KNL@VE7CW.#SEBC.BC.CAN.NOAM      ║
     ╚══════════════════════════════════════════════════════╝
---
 ■ QMPro 1.53 ■ Windows -- the industry substandard.


From Unknown Tue Jan 09 18:20:18 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!news.cais.com!cais2.cais.com!builder
From: Neil Fox <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Gain on helicals vs. yagis
Date: Fri, 5 Jan 1996 21:45:48 -0500
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]> <4c91in$[e-mail]>
NNTP-Posting-Host: cais2.cais.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]
In-Reply-To: <4c91in$[e-mail]>

The helix is not well modeled, in general by NEC.  There are no accurate
simulations available, but as suggested, the IEEE Transactions on
Antennas and Propagation has measurement data that can give a good feel.
The waveguide behavior of the helix makes it an odd "wire" antenna.  Much
work has been done since Kraus did his helix work in the late 40's, but
not much has been accurate, generally.  I have compiled most of the helix
articles in QST, IEEE, and IRE from 1949-present.  If anyone is
interested, just email me.

Neil


From Unknown Tue Jan 09 18:20:19 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!overload.lbl.gov!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Rick Markey)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Ham-Ant Digest V95 #656
Date: 6 Jan 96 23:44:24 GMT
Organization: ucsd usenet gateway
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

At 03:45 AM 1/5/96 -0500, you wrote:

>       Does anyone know what kind of antenna that can be mounted to a
>Corvette w/o drilling holes. The 2nd problem is that the heater strips
>run vertical on the back window. I am currently using 2 meter and 440.
>Thanks,
>KE4OFP
>
>------------------------------
A friend of mine years ago, used a Larsen 3/4" mount through one of the fake
air vents on the back deck.  On the inside, He used a piece of aluminum for
a ground plane and always had good success.  de Rick Markey, KN3C





From Unknown Tue Jan 09 18:20:20 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!Norway.EU.net!nntp.uio.no!news.kth.se!tybalt.admin.kth.se!celsiustech.se!seunet!news2.swip.net!dos.canit.se!oden.abc.se!news2.transpac.net!news.tripnet.se!news
From: [e-mail] (Ulf Lange)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HB9CV Info
Date: 7 Jan 1996 07:10:31 GMT
Organization: Tripnet AB
Lines: 12
Message-ID: <4cnrl7$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: heron8.tripnet.se
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

In article <[e-mail]>, [e-mail] says...
>
>Can anyone point me towards info on the HB9CV anywhere on the Net or
>elsewhere ?  Reply by mail please.

The book Antennenbuch by Karl Rothammel covers the HB9CV topic very well.
Several examples of HB9CV antennas for the 20 m - 70 cm band are given.

Try your nearest public library.

Ulf SM6FYQ



From Unknown Tue Jan 09 18:20:21 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!van-bc!news.mindlink.net!agate!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!in2.uu.net!news.ner.bbnplanet.net!usenet.teradyne.com!ttd.teradyne.com!rice
From: [e-mail] (John Rice)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help Tuning 14AVQ
Date: 7 Jan 96 14:09:53 CDT
Organization: Teradyne Inc., Telecommunications Division
Lines: 19
Message-ID: <[e-mail]>
References: <4cc60g$[e-mail]> <[e-mail]>
NNTP-Posting-Host: riker1.ttd.teradyne.com

In article <[e-mail]>, Jeff Blumenfeld KB3DX <[e-mail]>
 writes:
> Dean -
>
> I have a Hustler 4BTV rather than a 14AVQ, but with virtually all
> trap verticals, the order of tuning is the same.  Start with the 10
> meter section, and tune by lengthening or shortening the tubing
> below the first trap (lengthening makes the antenna resonant at a
> higher frequency) to get it resonant on 10.

Uhhh. Last time I looked, 'lengthening' an antenna lowered the resonant
frequency.


--------

   John Rice -  K9IJ       | "I speak for myself, not my employer".
   [e-mail]         |  Miracles, Magic and Sleight-of-hand done here.
   [e-mail]          |  Licensed since 1959
   (708)-438-5065 - (bbs ) |  Ex: K8YZR, KH6GHC, WB9CSP, W9MMB, WA1TXV


From Unknown Tue Jan 09 18:20:22 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!usenet.eel.ufl.edu!col.hp.com!nntp.coast.net!frankensun.altair.com!sdd.hp.com!hp-pcd!hp-cv!reuter.cse.ogi.edu!news.willamette.edu!news.orst.edu!news.PEAK.ORG!billn
From: [e-mail] (Bill Nelson)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HELP!  R-7 Problem?
Date: 8 Jan 1996 05:12:57 GMT
Organization: CS Outreach Services, Oregon State University, Corvallis, OR, USA
Lines: 19
Message-ID: <4cq94p$[e-mail]>
References: <[e-mail]> <4chkv1$[e-mail]>
NNTP-Posting-Host: peak.org
X-Newsreader: TIN [version 1.2 PL2]

Bret McKee ([e-mail]) wrote:

: I had a trap die (open) in my R7 this fall.  The antenna worked fine on
: 10/12/15 meters, but had an infinite SWR on all the lower bands.  The 17
: meter trap was to blame, and Cushcraft was very responsive.  If your
: antenna will not load up on 10 meters, you don't have any open traps,
: because the 10 meter element doesn't use any traps, although it still
: goes through the mystic black box at the bottom.

This doesn't make any sense. The 10 meter section is only the bottom
part of the antenna - so all you can find out is if the trap immediately
above is shorted. You cannot tell if the trap is open.

Now, if it tunes up on 40 meters, then you know all the traps are good.

All the above assumes that Cushcraft used traditional trap construction
for the antenna.

Bill


From Unknown Tue Jan 09 18:20:23 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: loading coil conversion problem for 20 meter beam
Date: 8 Jan 1996 18:33:58 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 36
Message-ID: <4cro2m$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Rick Ruhl ([e-mail]) wrote:
: Hi gang:

: Here's one for the masses.  I'm building the short 20 meter yagi as
: described in the 1978 Radio Amateur's Handbook.  For the loading
: coils, it says to use 1-1/8 diameter centers for the coils, however,
: I can only find 1-1/16 inch centers.  I need to convert the number of
: turns on the coil (9 inches X 1-1/8 to 9 inches X 1-1/16th).

Just use the formula for coil inductance:

  L(uH)  =  (n*r)^2 / (9*r + 10*l)

where n is turns, r is radius in inches and l is length in inches.
The radius is to the center of the wire, not the form radius, but
for your application it may make little difference.  If r1 = 0.600"
and r2 = 0.569", and l = 9", then

   n2/n1  =  1.053

In other words, add about 5% to the number of turns on each coil.

That formula is not perfect, but it will be quite accurate in giving
you the new number of turns if you make a small change in one of the
other parameters.

Of course, for critical work, there are other factors to consider:
distributed capacitance along the coil may be slightly different,
and if the coil was accurately designed for a particular element
length AND diameter, be sure to stay with the same...the diameter
IS important!

--
Cheers,
Tom
[e-mail]


From Unknown Tue Jan 09 18:20:24 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!world!mv!wd1v.mv.com!user
From: [e-mail] (John Seney)
Subject: Log Periodic for Icom 706
Message-ID: <[e-mail]>
Organization: MV Communications, Inc.
Date: Fri, 5 Jan 1996 22:19:05 GMT
X-Nntp-Posting-Host: wd1v.mv.com
Lines: 18

I'd be interested in a log periodic design that went
from 6 meters down to maybe 20 meters so my 706 could
play with some directional gain. Anyone got plans?

73,

FYI: The latest version of Digital Scope.FAQ <304> is on my WWW Home Page.
        (All opinions are my own, including Digital Storage Scope.FAQ)




               John D. Seney |_|_|_|_| [e-mail]
          144 Pepperidge Dr. |_|   |_| www http://www.mv.com/ipusers/wd1v
   Manchester, NH 03103-6150 |_|_ _|_| [e-mail]
       LeCroy Sales Engineer | | | | | 800-553-2769

    (H) 603-668-1096 (F) 603-627-1623 (P) 800-SKYPAGE #5956779


From Unknown Tue Jan 09 18:20:25 1996
Path: news.epix.net!mango.epix.net!will
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Log Periodic for Icom 706
Date: Sat, 6 Jan 1996 09:57:26 -0500
Organization: epix.net
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mango.epix.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>


On Fri, 5 Jan 1996, John Seney wrote:

> I'd be interested in a log periodic design that went
> from 6 meters down to maybe 20 meters so my 706 could
> play with some directional gain. Anyone got plans?

A generic design appears in the ARRL ANTENNA BOOK.  Or call Charlie
Brainerd KA1PM at 719 395-4100. He makes & sells the TENNADYNE LPDA's.
Last I knew he did not offer one from 6 to 20 meteres, but all of his HF
models go from 10-20m.

[e-mail] - KD3XR - W F Sill, Tunkhannock, PA




From Unknown Tue Jan 09 18:20:26 1996
Path: news.epix.net!news.sprintlink.net!news.eznet.net!news.enterprise.net!news.enterprise.net!news.enterprise.net!btnet!demon!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet
From: Bud Simmons <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: MFJ HF ANTENNAS?
Date: 8 Jan 1996 16:23:40 GMT
Organization: LATG DSE
Lines: 4
Message-ID: <4crgec$[e-mail]>
NNTP-Posting-Host: simmonsmac.sps.mot.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12(Macintosh; I; PPC)
X-URL: news:rec.radio.amateur.antenna

Does anyone have any experience with the MFJ multi-band verticals?
How do they compare with Butternut etc.




From Unknown Tue Jan 09 18:20:27 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: NEC4
Date: 5 Jan 1996 09:26:29 GMT
Organization: ELNEC/EZNEC Software
Lines: 16
Message-ID: <4ciqs5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-pdx02-19.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   "Jason R. Rieg" <[e-mail]> writes:
>  Can anyone tell me how I can get my grubby little hands on a copy of NEC4?

>  Thanks.

Yep, use those hands to pass $850.00 to the U. of California and it's yours
(assuming you're a U.S. citizen). Ordering is done via Jerry Burke at
Lawrence Livermore National Labs. I'll get you his address if you're
interested.

Last time I checked, only source code was available except for the Macintosh.
So you'll also have to get a FORTRAN compiler to compile it for other types
of machines.

Roy Lewallen, W7EL



From Unknown Tue Jan 09 18:20:28 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!bcstec!matrix.hv.boeing.com!richesop
From: [e-mail] (Peter Richeson)
Subject: Re: NEC4
X-Nntp-Posting-Host: matrix.hv.boeing.com
Message-ID: <[e-mail]>
Sender: [e-mail] (NNTP News Access)
Organization: The Boeing Company
References:  <[e-mail]>
Date: Fri, 5 Jan 1996 13:24:29 GMT
Lines: 14

I do not think it is on the free mkt yet.  Try writing to lawrence
Livermore National laboratory, don't have there addr.  Hope this helps.


.      '''
.     (o o)
___ooO-(_)-Ooo________________________________________________________
Peter D. Richeson                    | "I don't believe in a no-win   |
Email: [e-mail] |  scenaro."                     |
Phone  [phone]                 |    - Admiral James T. Kirk     |
----------------------------------------------------------------------
I do not speak for any one but me, and some times not even for me.
----------------------------------------------------------------------



From Unknown Tue Jan 09 18:20:29 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!news.onramp.net!zdc!zippo!usenet
From: "Jason R. Rieg" <[e-mail]>
Subject: Re: NEC4
Content-Type: text/plain; charset=us-ascii
Sender: [e-mail]
Content-Transfer-Encoding: 7bit
Nntp-Posting-Host: jrieg.bpd.harris.com
Organization: Harris Corporation
Message-ID: <[e-mail]>
References: <[e-mail]> <4ciqs5$[e-mail]>
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
Mime-Version: 1.0
Date: Mon, 8 Jan 1996 16:30:28 GMT
Lines: 27

Please excuse my ignorance, but it is my understanding that software developed
 at
public institutions (such as U.C.) are public domain and a U.S. citizen can on
ly be
charged a nominal fee for them, much the same as shareware.

With this in mind, why is there an $850 charge?

[e-mail] (Roy Lewallen) wrote:
>
>Yep, use those hands to pass $850.00 to the U. of California and it's yours
>(assuming you're a U.S. citizen). Ordering is done via Jerry Burke at
>Lawrence Livermore National Labs. I'll get you his address if you're
>interested.
>
..
>
>Roy Lewallen, W7EL
>

Thanks,

--
| Jason Robert Rieg             | "listen: there's a hell of a |  ___   __o
|
| Antenna Electrical Engineer   |  good universe next door;    | ___  _`\<,_
|
| Harris Corp. / Broadcast Div. |  let's go."                  | ___ (*)/ (*)
|
| [e-mail]              |             - E.E. Cummings  | ^^^^^^^^^^^^
|




From Unknown Tue Jan 09 18:20:30 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!crl.dec.com!caen!sol.ctr.columbia.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!hkusuc.hku.hk!usenet
From: [e-mail] (Tony)
Subject: Need help for ( Cushcraft ARX-2B )
X-Nntp-Posting-Host: p78.du.hku.hk
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: The University of Hong Kong
X-Newsreader: Forte Free Agent 1.0.82
Date: Tue, 9 Jan 1996 02:59:13 GMT
Lines: 8

Any ham is using ARX-2B from Cushcraft ...?
1. Manual for ARX-2B  or
2. Need help to step by step assemble & fine tune the SWR on that
antenna.

73', Tony VR2ZXZ
[e-mail]



From Unknown Tue Jan 09 18:20:31 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!news1.halcyon.com!coho!gordonm
From: [e-mail] (Gordon Mitchell)
Newsgroups: rec.radio.amateur.antenna
Subject: Need UHF DF ideas
Date: 7 Jan 1996 20:16:08 GMT
Organization: Northwest Nexus Inc.
Lines: 9
Message-ID: <4cp9m8$[e-mail]>
NNTP-Posting-Host: coho.halcyon.com

I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and
Adcock array with a doppler scheme for DF.

It would be ideal to find one that is hand-held, compact, and doesn't
take much power.  Generally it will be used in the 130-900 MHz range.

   Gordon Mitchell   K7HCV  [e-mail]
   Future Focus, Inc  [phone]
   Electronic eavesdropping countermeasures


From Unknown Tue Jan 09 18:20:32 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!g1ukq.demon.co.uk
From: [e-mail] (andy)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Need UHF DF ideas
Date: Tue, 09 Jan 1996 18:35:00 GMT
Lines: 30
Message-ID: <[e-mail]>
References: <4cp9m8$[e-mail]> <4cpd4m$[e-mail]>
NNTP-Posting-Host: g1ukq.demon.co.uk
X-NNTP-Posting-Host: g1ukq.demon.co.uk
X-Newsreader: Forte Agent .99d/32.168

Christopher Trask <[e-mail]> wrote:

>Gordon Mitchell <[e-mail]> wrote:
>: I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and
>: Adcock array with a doppler scheme for DF.
>
>: It would be ideal to find one that is hand-held, compact, and doesn't
>: take much power.  Generally it will be used in the 130-900 MHz range.
>
>:    Gordon Mitchell   K7HCV  [e-mail]
>:    Future Focus, Inc  [phone]
>:    Electronic eavesdropping countermeasures

  I've just built a doppler DF unit for use on 2m, but it *should*
operate well into UHF.

  It uses a 4001 as a 700Hz oscillator with complimentary outputs.
These outputs are fed to g2 on a couple of BF982 dual-gate FETs which
act as gated wide band pre-amps.

  If you want more info I can try and get the schematics scanned.

Andy.

[e-mail]
[e-mail]

G1UKQ @ GB7ULV.#14.GBR.EU



From Unknown Tue Jan 09 18:20:33 1996
Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ LeBlanc)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Noise rejection
Date: 7 Jan 1996 16:45:33 GMT
Organization: Central FL Listeners Group
Lines: 48
Message-ID: <4cotbd$[e-mail]>
References: <[e-mail]> <4cijtc$[e-mail]>
NNTP-Posting-Host: @204.215.242.169
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

In article <4cijtc$[e-mail]>, [e-mail] says...
->
->Phil Marshall <[e-mail]> wrote:
->
->>I am interested to know if there is a basic simple antenna type or
-technique
->>which will improve the rejection of local man made noise. I have read that
->>1/4 wave verticles are poor in this respect but maybe this is due to their
->>omnidirectional reception properties. Therefore, if this basic type is
->>considered poor, is there a mechanism for noise rejection that I am not
-aware
->>of.
->
-><snip>
->
->>Can anyone please help or offer any theory on this subject ?
->>--
->>Phil Marshall
->
->Hello, Phil:
->
->While you don't say what frequencies you are interested in, I assume
->that you are talking about something in the HF spectrum...
->
->Anyway, keep in mind that most man-made noise is vertically polarized.
->By simply going to a horizontal antenna, you will drop the noise by a
->significant amount.

Bear in mind that horizontal antennas tend to be vertically polarized
off the ends (horizontally broadside).

Two noise fighting receiving antennas are the TTFD (terminated tilted
folded dipole) which is a wideband antenna, and the other one is a
(tuned) phased horizontal loop antenna which is featured in the Sept
95 QST.  The latter provides around 4-5 s-units of power line noise
rejection and includes some helpful theory on the subject in the
article.

You could also try the JPS ANC4 antenna phasing unit for noise reduction
if you can adequately sample the noise source with the "noise" antenna.
There's a homebrew version available ("The Null Steerer Revisited" in
July 94 QST) which covers the HF ham bands (the JPS covers the whole
HF range).

Hope this helps,

Russ



From Unknown Tue Jan 09 18:20:34 1996
Path: news.epix.net!news.sprintlink.net!news.wwa.com!buffnet2.buffnet.net!usenet
From: [e-mail] (david james)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Off-center fed dipole?
Date: 9 Jan 1996 00:42:11 GMT
Organization: BuffNET
Lines: 14
Message-ID: <4csdl3$[e-mail]>
References: <4c2cso$[e-mail]> <4cenjl$[e-mail]>
NNTP-Posting-Host: fppp5.buffnet.net
X-Newsreader: WinVN 0.92.2

In article <4cenjl$[e-mail]>, [e-mail] (Cecil
A. Moore~) says:
>
>Hi Eric, my 102 ft dipole fed with 300 ohm ladder-line is an efficient all-
>band HF antenna. On 80m, a parallel cap at about 38 feet kills the reflection
s
>and drops the impedance to a flat 300 ohms. On 40m, a 6 ft stub at the Xmtr
>end does the same thing. A 4:1 balun takes the impedance from 300 ohms to 75
>ohms. I need no antenna tuner on any HF band. The balun sees nothing but

So where exactly (38 feet from feed point .. or what)  is the cap.
Maybe a diagram ??

Thenks

[e-mail]


From Unknown Tue Jan 09 18:20:36 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Off-center fed dipol
Date: 8 Jan 1996 18:13:43 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 27
Distribution: world
Message-ID: <4crmsn$[e-mail]>
References: <4cenjl$[e-mail]> <[e-mail]>
NNTP-Posting-Host: scorpion.ch.intel.com

In article <[e-mail]>,
FORREST GEHRKE <[e-mail]> wrote:

>While I don't disagree with your conclusions, I do take
>exception to your belief that "most hams had access to a VTVM
>and a grid dip meter" in the 1920's and 1930's.

Hi Forrest, I guess I was fortunate. My Elmer was Shorty,
W5OLV (SK) and he was the local Madison Co., TX radio/TV
repairman. He loaned out his VTVM and grid dip meter to
all the local hams. But, as you say, one can make do with
a pickup loop with a neon or other kind of bulb.

>"The most dangerous persons and groups in our society
>are those who do not know that they do not know".

Funny thing, W5OLV showed me exactly how to tune up an
antenna when I was in junior high school. I memorized
the procedure without really knowing what I was doing.
Here, almost 50 years later, those memories come pouring
back along with the understanding and knowledge of what
is actually happening - at least what appears to be
happening. :-) After the latest discoveries in quantum
physics, I'm not sure waves and particles exist at the
sub-atomic level.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Tue Jan 09 18:20:36 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Poor Stereo Reception Local?
Date: Sun, 07 Jan 96 07:06:18 GMT
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Joseph Gutstein) wrote:

>My Onkyo receiver indicates zero signal strength when I've used the
>following: a dipole, a Terk Amplified antenna, no antenna at all.

Most Onkyo receivers have a better than average front end.  It's
unlikely this is an overload problem.  Take your receiver to
a service center and have the sensitivity checked before spending
more money on antennas.

73,
Jack  WB3U


From Unknown Tue Jan 09 18:20:39 1996
Path: news.epix.net!plum.epix.net!gmfoster
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: Sun, 7 Jan 1996 21:08:10 -0500
Organization: epix.net
Lines: 91
Message-ID: <[e-mail]>
References: <4b9jgi$[e-mail]> <4bc3e4$[e-mail]> <4ceesi$[e-mail]>
NNTP-Posting-Host: plum.epix.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4ceesi$[e-mail]>



On Wed, 3 Jan 1996, Jim Weir wrote:

 >
 > All I can do is comment on PVC, nylon, and the rest of the plastics
 > after doing antenna design and consulting for over 30 years.  I
 > realize that's not very much time (if you are a tree) but I have done
 > several hundred designs and prototypes, quite a few of which were done
 > using plastic as the construction medium.  Those of you who fly light
 > aircraft probably recognize some of those designs.
 >
 > Anyway, I've used PVC plain old water pipe from below 30 MHz. to above
 > 2 GHz. and if you allow a SLIGHT fudge factor for some minor
 > dielectric foreshortening and a SLIGHT fudge factor for some minor
 > dielectric losses, PVC is by far superior to anything else I've been
 > able to get my hands on as a construction support for prototypes and
 > one-off designs (like the ham antennas around the house).
 >
 > As a matter of fact, I've just completed the design on a series of VHF
 > (100-200 MHz.) base loaded monopoles, which are notoriously "goosey"
 > to local perturbations in the immediate vicinity of the elements.  The
 > antennas are hermetically sealed in 3/4" PVC schedule 80 water pipe
 > and all that was required was about a 5% pruning factor (over and
 > above the regular 3-8% w/l factor) for the PVC loading.  Measurements
 > relative to the same monopole in air showed less loss than I can
 > measure with the HP/Tek antenna range that I do FCC measurements on
 > (0.1 dB reliably is about the best I can guarantee).
 >
 > As to nylon being a bad actor, why do you suppose then that there is a
 > mil spec and a commercial spec for coil forms built on a nylon-filled
 > base and tube?  Sorry, this one doesn't wash either.
 >
 > I am glad to see that somebody used the black ABS stuff and is
 > reporting good results with it for coil forms.  I've never used the
 > black just because I suspicioned that anything black probably had
 >  dissolved carbon particles in it.  Glad to know I can at least start
 > messing around with it, as it is pretty stout stuff AND I can get
 > diameters up to 6" in the form of sewer pipe.
 >
 > As an aside to particulate conductor matter in the mechanisms, I was
 > once called upon to make some tests with HF/VHF/UHF antennas installed
 > inside a  thin plywood shell, then the thin wood covered with dacron,
 > then the dacron impregnated with a paste (dope) made of solvent and
 > aluminum powder (a Bellanca aircraft wooden wing).  We thought the
 > aluminum dope would play hell with the antennas.  Not so.  Once again,
 > we set up two dipoles on the test range and put a wing in between
 > them.  Not a bit of loss.  Put the antenna inside the wing.  Couldn't
 >  tell the difference.  Our guess was that the aluminum powder particles
 > were each suspended in a small sphere of the solvent and couldn't make
 > contact to form a continuous sheet.  On the other side of that coin,
 > we got reports that there was a German metallic paint that gave a
 > gorgeous finish, but that antennas buried inside the foam wing of
 > various homebuilt airplanes using this paint had the response of a
 > piece of spaghetti inside a copper septic tank.  I doesn't explains
 > 'em, I just reports 'em.
 >
 > Finally, as to the grey stuff (flex conduit) in PVC, I've used it, but
 > since the white stuff in the form of water pipe is cheaper, I've never
 > had a reason to mess with it very much.  Sorry, I don't buy the
 > "microwave oven" test for goodness of a material except at 2.4 GHz. or
 > so.
  >
 > Jim
 >
 >
 >
>
Jim

Please explain your thinking on the microwave tests more. I would think
that if it passed the test it would be good at most any frequency.
However even if it fails I would expect many materials would be suitable
for HF use. Are you saying that a material that passes the oven test
might still be unsuitable for use at HF?


                                        Garry WB0NNO





 Jim Weir VP Engineering  | "We seem to be standing on
> RST Engineering          |  the foreskin of technology."
> Grass Valley CA 95945    | (Gen. Chuck Yeager)
> voice/fax [phone]   |
> [e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ
>
>
>


From Unknown Tue Jan 09 18:20:40 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!willis.cis.uab.edu!ddsw1!news.mcs.net!usenet
From: [e-mail] (Gary Myers)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: Mon, 08 Jan 1996 03:00:10 GMT
Organization: MCSNet Internet Services
Lines: 31
Message-ID: <4cq1d3$[e-mail]>
References: <4b9jgi$[e-mail]> <4bc3e4$[e-mail]> <4bc5vo$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: gmyers.pr.mcs.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (WB3U) wrote:

>   Paul Moller <[e-mail]> wrote:

>>Black is usually achieved by adding carbon, which is lossy. Other colors
>>should be more friendly. PVC in itself is not bad, and certainly not as
>>lossy at hf as the rumor of years gone by has indicated.

>Paul, have you seen any numbers for this, or other comparative
>information?  I'm one of those who has stayed away from PVC because
>of those rumors.  Do you know if PVC is less lossy than the "bad"
>plastics like Nylon?

>73,
>Jack  WB3U

I have no figures, but I do know that PVC is sufficiently lossy at 27
MHz, that it is the material of choice (in sheet form) for use with rf
dielectric sealers. We use 27 MHz sealers at work to seal hazardous
materials like radioactively-contaminated waste into PVC pouches; the
rf heats the seam at the open end of the pouch and melts the PVC
together to form a (an?) hermetic seal. This doesn't work AT ALL with
sheet polyethylene, so PVC definitely is more lossy at 27 MHz than PE.

I once put a short section of PVC pipe in a microwave oven (along with
a cup of water, for the oven's sake), and it got HOT, so it certainly
is lossy at 2450 MHz, as well.

-- 73, Gary K9CZB <[e-mail]>




From Unknown Tue Jan 09 18:20:41 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!ifwtech.demon.co.uk!G3SEK
From: Ian White <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: Mon, 8 Jan 1996 07:54:07 +0000
Organization: IFW Technical Services
Lines: 39
Distribution: world
Message-ID: <[e-mail]>
References: <4b9jgi$[e-mail]>
 <4bc3e4$[e-mail]> <4bc5vo$[e-mail]>
 <[e-mail]> <[e-mail]>
 <[e-mail]> <4cq1d3$[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
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MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.10 <9qI82xurdT5+z2vSgnCPFcKgQL>

In article <4cq1d3$[e-mail]>, Gary Myers wrote:
>
>I have no figures, but I do know that PVC is sufficiently lossy at 27
>MHz, that it is the material of choice (in sheet form) for use with rf
>dielectric sealers. We use 27 MHz sealers at work to seal hazardous
>materials like radioactively-contaminated waste into PVC pouches; the
>rf heats the seam at the open end of the pouch and melts the PVC
>together to form a (an?) hermetic seal. This doesn't work AT ALL with
>sheet polyethylene, so PVC definitely is more lossy at 27 MHz than PE.
>
>I once put a short section of PVC pipe in a microwave oven (along with
>a cup of water, for the oven's sake), and it got HOT, so it certainly
>is lossy at 2450 MHz, as well.

This clearly illustrates what I was trying to say a few days ago: one
type of "PVC" can be very different from another. It's impossible to
generalize.

The soft, transparent grade used for pouches is clearly NOT the same
material as the rigid grade used for pipe. They both contain polyvinyl
chloride but there the resemblance ends. The soft grade contains lots of
plasticizer and is also polymerized differently, with less cross-linking
at the molecular level than the rigid grade. The rigid grade also
contains colorant and possibly inorganic fillers.

If we just say "Huh, it's all PVC," we're only confusing ourselves.
Even saying "PVC pipe" is hardly less confusing. Gary found one type
that got hot in the microwave oven, while I found one that didn't and
another that only got slightly warm. But maybe it wasn't PVC after all -
maybe it was ABS pipe?

Sorry, but there's simply no substitute for testing the specific
material that you are hoping to use.

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - anywhere.


From Unknown Tue Jan 09 18:20:43 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: 7 Jan 1996 17:29:39 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 37
Distribution: world
Message-ID: <4covu3$[e-mail]>
References: <4c6i7c$[e-mail]> <[e-mail]> <4ch958$[e-mail]> <4cifk9$[e-mail]>
NNTP-Posting-Host: scorpion.ch.intel.com

In article <4cifk9$[e-mail]>,
Wes Stewart <[e-mail]> wrote:

>The SWR metering circuit is calibrated at 50 ohm, so with a
>100 ohm load it correctly displays a 2:1 SWR.

Hi Wes, thanks for the response. I guess the above is what is
bothering me. I can set up a system where there is no reflected
power from that 100 ohm dummy load so the 2:1 SWR displayed by
the 50 ohm metering circuit is in error. Let's say the load
line on the SB-201 is 5k ohms and let's say the antenna is
a resonant (resistive) 300 ohm folded dipole with no
reflections. 5k ohms to 300 ohms is an easy match for a pi-
network. And yet a built-in 50 ohm SWR meter might read
6:1 falsely indicating a problem.

I'm not an expert on directional couplers. I do know that a
toroidal pickup gives a voltage in phase with the current
which is vectorally added to the transmission line voltage
and adjusted for a null looking into a dummy load. This
kind of device will give a reflected power indication when
there is no reflected power if the load is not equal to the
calibration impedance.

The directional coupler in the SB-201 is the type where
parallel inductive couplers are close to the transmission
line. One wire gives forward current and the other wire
gives reverse current. They are indeed calibrated for 50
ohms but it looks like if there are no reflections, there
will be no indication of reflected power. It's just that
the indicated forward power will be in error if the load
is not equal to 50 ohms.

So is the parallel wires type directional coupler superior
to the toroidal pickup type for the above reasons?

thanks and 73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Tue Jan 09 18:20:44 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: 7 Jan 1996 17:38:24 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 10
Distribution: world
Message-ID: <4cp0eg$[e-mail]>
References: <4ch958$[e-mail]> <4cjpkn$[e-mail]>
NNTP-Posting-Host: scorpion.ch.intel.com

In article <4cjpkn$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:

>However it is important to remember the load is conjugately matched to the
>loadline of the device, not a real resistor.

So that's how we get more than 50% efficiency from a generator? The
resistive loadline is not dissipative? Where does the power go? :-)

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Tue Jan 09 18:20:45 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!nwfocus.wa.com!news.nas.com!kristina.az.com!andys
From: [e-mail] (Andrew James)
Newsgroups: rec.radio.amateur.antenna
Subject: TV antenna plans?
Date: 9 Jan 96 03:52:26 GMT
Organization: Network Access Services, Inc.
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: kristina.az.com
X-Newsreader: NN version 6.5.0 #1 (NOV)

Does anyone have plans to make a simple tv antenna that works better than
rabbit ears?

Thank you.

Andrew James
[e-mail]
--
Andy
Web = http://www.az.com/~andys
E-mail = [e-mail]


From Unknown Tue Jan 09 18:20:46 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!newshost.convex.com!news.dfw.net!news
From: David Mclean <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Web Page with MODs, Calls lookup, Ham links, Swap page, and more!!
Date: 8 Jan 1996 00:34:53 GMT
Organization: Road Kill Cafe!
Lines: 17
Message-ID: <4cpord$[e-mail]>
NNTP-Posting-Host: dfw.dfw.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.misc:96612 rec.radio.amateur.antenna:18314 rec.radio.amateur.digital.misc:13531 rec.radio.amateur.equipment:23497 rec.radio.amateur.homebrew:12589 rec.radio.amateur.policy:32440 rec.radio.amateur.space:6094

I would like to welcome all of you to my web page. The address of my web
page is "http://www.dfw.net/~dmclean". I have many links that you will
like. Here is a list of things that I have on my Web page:
1. Swap Page
2. Mods page
3. QRZ call lookup
4. Repeters freqs.
5. Links to F.C.C, A.R.R.L, and many more.
Check it out. You will like it.
--
                                                    David Mclean
                                              From The World of Hamradio
                                                   KC5NNV is Clear!
_________________________________________________________________________
-------------------------------------------------------------------------




From Unknown Tue Jan 09 18:20:47 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.nuri.net!usenet
From: [e-mail] (Gun Kim)
Newsgroups: rec.radio.amateur.antenna
Subject: What kind of HF antena using space of apartment's balconi?
Date: 9 Jan 1996 03:19:57 GMT
Organization: Yukong Oxichemical
Lines: 9
Message-ID: <4csmst$[e-mail]>
NNTP-Posting-Host: 168.154.151.101
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

Hellow!
I'm biginner of amateur radio,in South Korea.
I have 2m and HF all band Rig.
But I am in a difficulty to construct antena system.
I need information for using apartment's balconi.

thanks,
DE DS1AFL 73~~



From Unknown Tue Jan 09 18:20:47 1996
Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!gatech!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Where is earth gnd for antennas?
Date: 8 Jan 1996 16:21:09 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 9
Distribution: world
Message-ID: <4crg9l$[e-mail]>
NNTP-Posting-Host: tboza.ch.intel.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Depending upon the soil content, where is "true" ground when
calculating height above ground for antennas? Since I live
in Arizona, where the soil is dry rock and sand, I was told
that an antenna at 40 ft above earth (dry/rock/sand) ground
is the same as if the antenna was at 60 ft above earth in
Florida (wet/top soil) ground. True?

WB7ASR...



From Unknown Tue Jan 09 18:20:48 1996
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: Listserv@ucsd (Mailing List Processor)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: your LISTSERV request "help tuning 14avq"
Date: 8 Jan 96 07:59:18 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

The mailing list "tuning" could not be found.
You may use the INDEX command to get a listing
of available mailing lists.


From [e-mail] Fri Jan 12 14:05:21 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.antenna
Subject: Mobile CB antenna question
Date: 3 Jan 96 19:04:00 GMT
Organization: ucsd usenet gateway
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]




Mon, 25 Dec 1995 18:35:28 EST From: <[e-mail]>
writes:

 -I've used the cellular-phone type cb radio antenna, and it really,
 -didn't work so well...the only good thing was that the antenna cord
 -didnt have to pass through the window....

You're right, the only good thing about an antenna like that is that
the coax doesn't have to go through the window!
As far as antennas go they are poor at best.  If you want to be able
to transmit any distance you really need the quarter wave whip
antenna.

Kevin, WB5RUE
[e-mail]


From [e-mail] Fri Jan 12 14:05:22 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!uunet!in2.uu.net!news2.new-york.net!buttercup.cybernex.net!joeg
From: [e-mail] (Joseph Gutstein)
Subject: Poor Stereo Reception Local?
X-Newsreader: TIN [version 1.2 PL2]
X-Nntp-Posting-User: joeg
Organization: Cybernex Inc.
Message-ID: <[e-mail]>
X-Nntp-Posting-Host: buttercup.cybernex.net
Date: Wed, 3 Jan 1996 19:51:50 GMT
Lines: 15

I moved to a highrise about 7 miles from the World Trade Center (which I
can see) and find that my FM reception is now abysmal. My Onkyo receiver
indicates zero signal strength when I've used the following: a dipole, a
Terk Amplified antenna, no antenna at all. What I've ending up doing is
having no antenna connected to the FM terminals and setting the receiver
to the FM mono mode. I must be doing something wrong.
Any suggestions would be greatly appreciated.
Thanks,
Joe

---------------------------------------------------------
Joseph Gutstein, Cliffside Park, NJ, [e-mail]
Many can bear adversity but few can bear contempt. (anon)
---------------------------------------------------------



From [e-mail] Fri Jan 12 14:05:24 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!newsserver.jvnc.net!news.cyanamid.com!news
From: [e-mail] (Dale Chidester)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 160 meter trap
Date: 3 Jan 1996 21:44:04 GMT
Organization: American Cyanamid Company
Lines: 21
Message-ID: <4cetb4$[e-mail]>
References: <4cc9ie$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 141.173.56.12

I think you may be a little confused about traps.  Traps, in dipole antennas,
are
used to make the antenna resonant at higher frequencies than the length of the

dipole.  For example, an 80 meter dipole can be made to work on 40 by putting
resonant traps in approximately where the ends of a 40 meter dipole would be.
 This
makes the antenna "look" like it ends at the traps and therefore is resonant.
Likewise 30, 20, 17, 15, 10 and 6 meter traps could be put in... but at some p
oint
you wind up with more traps than antenna!  The only way I know to get an anten
na
to resonate at a lower frequency is to load it inductively, as through a tuner
.
        73
                dale


------------------------------------------------------------------------
Dale H. Chidester, PhD           N3HAL      "Against stupidity, even the
Cyanamid Agricultural Research Center        Gods in vain doth contend."
Agricultural Products Research Divison                          Schiller
PO Box 400,  Clarksville Rd.           Phone: [phone]
Princeton, NJ  08543-0400              Email: [e-mail]
------------------------------------------------------------------------




From [e-mail] Fri Jan 12 14:05:24 1996
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From: [e-mail] (Joe Bulger)
Newsgroups: rec.radio.amateur.antenna
Subject: Arrival angles
Date: 3 Jan 1996 21:56:49 GMT
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Does anyone know of an antenna that is used to measure arrival angles of
HF signals? I would like to be able to readout arrival angles of signals
on 160M.



From [e-mail] Fri Jan 12 14:05:25 1996
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From: [e-mail] (John Lumkes)
Newsgroups: rec.radio.amateur.antenna
Subject: T-match and gamma match?
Date: 3 Jan 1996 22:24:13 GMT
Organization: College of Engineering, Univ. of Wisconsin--Madison
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I have seen several articles refering to using gamma match
design parameters in designing a suitable T-match. I have the
gamma match computer program from the latest ARRL Antenna book
and want to use it to design a T-match for a portable Yagi
(9 element) I am working on. If I want 200 ohm from the T-match
(so a 4:1 coaxial balun gives 50 ohms) do I design one gamma
match for 100, 200, or what input impedance? Any other pointers
and / or hints are welcome. Thanks alot in advance !

John Lumkes AA9QP
[e-mail]



From [e-mail] Fri Jan 12 14:05:26 1996
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From: Douglas Braun <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Weird antenna software?
Date: 8 Jan 1996 03:01:04 GMT
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Programs like NEC are designed for exactly this sort of problem.
NEC also handles large solid bodies, not just wires.

Doug Braun (SV/N1OWU)



From [e-mail] Fri Jan 12 14:05:27 1996
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From: [e-mail] (shatter)
Newsgroups: rec.radio.amateur.antenna
Subject: How to build best antenna?
Date: 9 Jan 1996 03:02:45 GMT
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I have an AOR 1000 scanner and a Yaesu FT-51R dual band 2m/440 ham radio
and want to put an antenna in the attic that has great receive from 0.5
Mhz to 1300 Mhz and an antenna which receives 2m/440 and transmit 2m/440
up to 60 watts...Where can I find plans to build these antennas?  Also
they will be placed in my attic so they can not be too big.. (maybe a max
height of 7' and a max radius of 4')

Thanks

Chad / KE6ZTC



From [e-mail] Fri Jan 12 14:05:28 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: 9 Jan 1996 06:47:36 -0500
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In article <4cp0eg$[e-mail]>, [e-mail]
(Cecil A. Moore~) writes:

>
>So that's how we get more than 50% efficiency from a generator? The
>resistive loadline is not dissipative? Where does the power go? :-)
>
>73, Cecil, KG7BK, OOTC  (not speaking for my employer)
>
>

Hi Cecil,

Wes's description of the parallel stripline is very good. The frequency
slope can be compensated for over a wide frequency range. Bird does that
in their "slugs".'

As to the other question, the E/I of the maximum available fundamental
power is what is matched to when we tune a PA like the SB-201 for maximum
output. Some call it dynamic resistance (actually we match to the average
value of it), some call it impedance, and some apparently don't even
realize or won't admit it exists as a measurable effect.

If we just "tickle" the PA with an external signal close to the operating
frequency we can measure it, and it "looks" exactly like a resistor to the
external generator. That is the thing Walt Maxwell refered to that is
conjugately matched to. When it is matched to the load the efficiency can
be well over 50%, since it is a non-dissipative resistance.

If the SWR is 2:1 and you re-adjust the tank for maximum power transfer,
once again the load is matched to the average dynamic resistance or
"source impedance". If we make this adjustment, everything is conjugately
matched and the power goes to the load.

73 Tom



From [e-mail] Fri Jan 12 14:05:29 1996
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From: Bradford Ashley <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HF antenna for Apartment Dweller
Date: Tue, 9 Jan 1996 08:43:55 -0800
Organization: Oregon Health Sciences University
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        Thanks alot for the info. I am currentil limited to a 10m RS
HTX-100 with 25w PEP SSB and a small dipole out on my deck parallel to my
deck and neighbors. From what you say I consider myself lucky they have
said anythig yet. I'll try to put your info to good use.

                                                Thanks for your Time
                                                Brad WB7TSO



From [e-mail] Fri Jan 12 14:05:30 1996
Newsgroups: rec.radio.amateur.antenna
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From: [e-mail] (David Stockton)
Subject: Re: David Stockton
Sender: [e-mail] (SQF News Admin)
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[e-mail] wrote:
: To David Stockton:

: Nice to hear your comments, David.


   Oh, gosh, well, um, er

   Bill, I believe I saw mention of the low cost Collins 455kHz mech
filters in something you wrote, with a figure of $77 nearby. Any chance of
some details ? A friend is about to design a transceiver and was
contemplating a 455kHz final IF, but was put off by the lack of any CW-
appropriate bandwidth in the usual ceramic filters. I suggested that it
would be attractice to lay boards out to take either the ceramic cheapies
or the current Collins series so that builders would have an upgrade
path.

   With the norm being UK distributors DOUBLING the prices of parts and
equipment, he would use his contacts to buy from US sources. (Funnily
enough UK manufacturers sell their wares cheaper to US customers than
they do to UK customers - comparing before-tax prices. A colleague was
interested in a british designed and made DSP card for a PC. He could get
it cheaper from the US distributor, including paying import duty and tax
on bringing it back into the UK)

    Cheers,
            David   GM4ZNX


From [e-mail] Fri Jan 12 14:05:31 1996
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From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.antenna
Subject: WG: Re: Scanner antenna 26-1300MHz
Date: 9 Jan 96 17:44:00 GMT
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 ----------
Von: Koellner, Guenter
An: owner-ham-ant
Betreff: Re: Scanner antenna 26-1300MHz
Datum: Donnerstag, 19. Oktober 1995 07:59

Hello,

somebody asked for a scanner antenna. I just ordered an antenna from an
italian producer: ALAN T-735.
This antenna is a discone type but extended to cover 26-1300MHz, with
transmission optimization for 28, 144, 220, 432, 900 and 1300MHz.
At least, the price is low, abt. $75 here in Germany, where prices normally
are 1.5 times higher than stateside.

vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
                [e-mail]             (Internet)
                HTTP://WWW.SCN.DE/~KOELLNER (WWW)
                UO-22, KO-23 & KO-25        (Pacsats)


From [e-mail] Fri Jan 12 14:05:32 1996
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From: [e-mail] (Charlie Fortner)
Newsgroups: rec.radio.amateur.antenna
Subject: angle of ground plane radials????
Date: Tue, 09 Jan 1996 19:29:27 -0500
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I've seen plans for 2m using a SO-239 and some copper rods.  The
instructions say to bend the rods at a 45 degree angle towards the
ground.  I've seen commercially made 2m antennas that don't have bent
radials.  What does the angle  of the radials do for the signal?


From [e-mail] Fri Jan 12 14:05:33 1996
Newsgroups: rec.radio.amateur.antenna
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From: Frank Scutch <[e-mail]>
Subject: Any info on Bilal Isotron Antenna?
Content-Type: text/plain; charset=us-ascii
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Does anyone have any experience with an Isotron antenna?  This is the
one which looks much like a bird feeder.  I was thinking about trying
one of these on 160?  I noticed someone mentioned on another post that
the antenna was a "dog" on 80 meters.  I use a KLM 160V 160m vertical
now but was looking for another limited space alternative.

Frank, WB4AYJ




From [e-mail] Fri Jan 12 14:05:34 1996
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From: [e-mail] (Bob Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Poor Stereo Reception Local?
Date: 9 Jan 1996 22:04:43 GMT
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  Two things: I checked the current stock at Radio Shack, and they have
an adjustable attenuator, but their FM filter * removes * FM frequencies
for better TV reception.  I guess I remembered wrong...

  Second, are you sure your desired station comes from the World Trade
Center?  Maybe it was near your old home, or even on the other side from
Manhattan, and you moved further away from it, and now you're too far away.
If you get the NYC stations OK, but not your old favorite, maybe that's the
problem.

  Bob Bruhns, WA3WDR, [e-mail]




From [e-mail] Fri Jan 12 14:05:35 1996
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From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.antenna
Subject: ? Circular Polarisation
Date: 9 Jan 96 22:39:00 GMT
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Hello!

I have two questions:

1) If I take two identical antennas, one horizontal, one vertical, mounted
   without any forward offest mounted about 1 wavelenth parallel to each
   other, what must be done to make them to produce left- and right-hand
   circular polarisation? One thing to mention is matching the impedance,
   and the other is to feed one antenna a quarter wavelenth later. But
   under which circumstances which rotation direction will happen?

2) If I mount both antennas on the same boom this would not be possible
   without adding a forward offset (lets say, 2-5cm is possible). What
   must be done then? I expect the feedlength difference must be corrected,
   but which value? I think it could not be (2-5cm)*velocitiy_factor, as I
   expect the wave speed within the antenna directors field is not equal
   to the speed of light.

Please answer with Email as well as to the board. Thanks a lot in advance!

vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
                [e-mail]            (Internet)
                HTTP://WWW.SCN.DE/~KOELLNER (WWW)


From [e-mail] Fri Jan 12 14:05:36 1996
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From: "Thomas W. Castle" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: angle of ground plane radials????
Date: Wed, 10 Jan 1996 00:31:52 -0500
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On Tue, 9 Jan 1996, Charlie Fortner wrote:
> I've seen plans for 2m using a SO-239 and some copper rods.  The
> instructions say to bend the rods at a 45 degree angle towards the
> ground.  I've seen commercially made 2m antennas that don't have bent
> radials.  What does the angle  of the radials do for the signal?

The easiest way for me to explain it is: the 45 degree angle is to
make the typical home brew 1/4wave antenna come out to around 50ohm
impedance. I am sure a lot of other people will come out with other
opinions but if: you use an antenna analyzer to check the resistance
with the radials straight out as compared to 45 degrees you will see
the difference. If the length of the center radial is cut to a given
freq. an the radials are of the proper length an angle - you will have
a antenna that is resonant at the given freq with 50 ohm impedance an
a reasonably good SWR. The commercially made antennas usually have
a different length on the horizontal radials in order to get the proper
impedance.

Hope this helps a little
De Tom  KD4QHH



From [e-mail] Fri Jan 12 14:05:37 1996
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From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: How to build best antenna?
Date: 10 Jan 1996 00:44:39 GMT
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Well Chad,
          Not to rain on your parade but... The first rule of a high
performance antenna is:  Get it HIGH!
If not high, make it BIG,
If not high or big, expect less.

Sorry, your expectations will not be meet.

But now that I've said that, try stuff, like a wire log-periodic in the
rafters. Don't give up because I say so, I've been wrong before,
(I remember, it was last year... I was mistaken.)

Tom
WA1RHP




From [e-mail] Fri Jan 12 14:05:38 1996
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From: Mark Herson <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: angle of ground plane radials????
Date: 10 Jan 1996 01:35:58 GMT
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[e-mail] (Charlie Fortner) wrote:

>I've seen plans for 2m using a SO-239 and some copper rods.  The
>instructions say to bend the rods at a 45 degree angle towards the
>ground.  I've seen commercially made 2m antennas that don't have bent
>radials.  What does the angle  of the radials do for the signal?

Charlie,

I don't think the angle of the radials will do anthing for your signal.
However, it does give a better match to 50 ohms. With the radials
straight out, you're looking at 30ish ohms (similar to a vertical on the
ground) and with them straight down, it's 70ish ohms (basically a
vertical dipole).

Guess the bottom line is to adjust the angle for the best swr.

73, Mark, N2MH




From [e-mail] Fri Jan 12 14:05:39 1996
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From: [e-mail] (N3NTJMatt)
Newsgroups: rec.radio.amateur.antenna
Subject: tuner problem
Date: 10 Jan 1996 02:08:10 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <4cvokq$[e-mail]>
Reply-To: [e-mail] (N3NTJMatt)

Hi all..
Does anyone know of a Kenwood auto tuner problem?
I know of a rig that will draw lots of current when you get to 20 thru 10
m and the AT will not tune for about 5 or 10 min.  Then, it is fine.
On 40 and 80m there is no problem.
Has anyone ever heard of this problem or know what it may be?
I am think the tuner but I dunno.
Also, any good, fast  Kenwood service areas near Cleveland or Pittsburgh?
thx and 73s
Matt
N3NTJ

[e-mail]


From [e-mail] Fri Jan 12 14:05:40 1996
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From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Off-center fed dipole?
Date: 10 Jan 1996 02:32:54 GMT
Organization: Intel Corporation, Chandler, AZ
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In article <4csdl3$[e-mail]>,
david james <[e-mail]> wrote:

>So where exactly (38 feet from feed point .. or what)  is the cap.
>Maybe a diagram ??

Hi David, In each half-wavelength of feedline, there are 4 near-
magic points where a stub, cap, or inductor can be attached to
kill the reflections. Once the reflections are killed at that
point, it doesn't matter (within reason) how far it is from
that point to the transmitter as the SWR is 1:1 and the line
is flat. At the transmitter end, one really cannot tell it from
a 300 ohm folded dipole with a 1:1 SWR.

My antenna is the G5RV standard dipole length of 102 ft. It is
30 ft. high fed with 300 ohm ladder-line. No two antennas are
identical so take the "where exactly" with a grain of salt.

Given the 70-j300 ohm impedance of my 102 ft. dipole on 3.7
MHz, a parallel inductor or a shorted stub can be put at
15.8 ft from the antenna to kill the reflections. That point
is not convenient for me. So I chose the next possible point
which is a parallel 270 pf cap 36.5 ft from the antenna. The
third "magic" point is 68.5 ft from the antenna where two 100pf
series caps will do the trick. The forth point is at 89 ft
from the antenna where two series inductors will work.

For 40m, a 6 ft shorted stub placed in parallel at 82 feet
from the antenna does the job. Obviously, the 75m caps must
be removed for 40m operation and the 40m stub removed for
75m operation. At least I think so - I haven't calculated
the effects. Sometimes, Murphey is on vacation and one
extra stub will not appreciably affect the overall results
especially if one simply removes the jumper from a shorted
stub turning it into a high-impedance open stub.

I roasted 6kv ceramic caps with 600 watts so use door-knobs,
HV micas, or vacuum caps at the higher powers. The flat (both
ways) 300 ohm line is brought to a 4:1 balun which drops the
impedance to 75 ohms or less giving a maximum SWR of 1.5:1
at 50 ohms which makes either the tuner or the transmitter
happy. The tuner is designed to be efficient at those impedances.
My SB-201 matches them perfectly and so does my MFJ-949. My
signal reports have improved greatly since my tuner is happy.
First contact with the tuned 40m system was from AZ to GA
using 100w at night with 5x9 reports both ways.

My non-resonant length antenna turns in an SWR of less than
1.5:1 on *all* the HF bands without an antenna tuner. How
'bout that, Jack?

Enjoy and 73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Fri Jan 12 14:05:42 1996
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From: [e-mail] (Jeff Shelton)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Are Bilal Isotron antennas any good?
Date: Wed, 10 Jan 1996 03:08:34 GMT
Organization: George Mason University, Fairfax, Virginia, USA
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[e-mail] (ZaaX) wrote:

>I would like to hear from anyone that owns a Bilal Isotron antenna.

I've got an Isotron 40, and think well of it as a LIMITED SPACE
antenna.  It can't compete with a full size dipole or a good vertical
(despite ad claims), but I can't put an R7 in my attic.  I have found
that the Isotron is MUCH better than the various mobile whips, random
wires, or tuned rain gutters I've used prior to getting the Isotron.

I also got a Isotron 20, but have had little chance to test it out, as
when I can get on the radio, 20 has usually shut down for the night.

Be aware that setting the resonant point on an Isotron is something of
a hassle, especially for 40/80/160.  If you can borrow an antenna
analyzer or noise bridge, it's a lot easier, though you can do it with
just a xcvr and SWR meter -- eventually.  Bilal is very good about
helping over the phone if you need it.

                                 Jeff Shelton  KS4TL



From [e-mail] Fri Jan 12 14:05:44 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: "Doty" in new article
Date: 10 Jan 1996 06:32:26 -0500
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Hi Lawrence,

In article <[e-mail]>, [e-mail] (Lawrence
Stoskopf) writes:

<SNIP>
>He also refers to an article I've filed away and nearly forgotten: Using
>Elevated Radials with Ground Mounted Towers by KB8I in Sept 91, pp 77-82
IEE
>Trans on Broadcasting.  ".. it is possible to use four elevated radials
>together with a conventional ground-mounted, base-insulated tower for MF
>broadcasting purposes, and achieve the same level of performance which is
>normally obtained from a classic 120-buried-radial system."  This from
NEC
>simulation.

<SNIP>

>"Do not place radials on or below the ground unless there is space for
some
>120 radials and the site has good ground conductivity;(with poor ground
>conductivity it is useful regularly to water the ground!"
>Hawker's final comments:
>"VK1BRH emphasises that simulated results are only as good as the
computer
>program.  However he considers that NEC-81 is good at modelling linear
>antennas close to lossy ground.  It has been validated numerous times
but,
>even so, it has failed even more times due to inappropriate use."

Wher is the validation at? I can't find any, can anyone else? ALL the data
I find tends to ***disprove*** NEC's accuracy with any horizontal wire
below .1 WL or so!!!!!!!!

>My wish list:

>1.  A good review article going back to the original Brown articles.

>2.  A meta-analysis of data already published.  (A technique in which you
>combine a whole batch of statistically insignificant data to hopefully
make
>it statistically significant)
>
>3.  A rework of the Doty model with corrections and field strength
>measurements.

HARD COLD FACTS:

1.) When I actually measured the FS from a 80 meter vertical with four
elevated radials, FS was around five dB down from the same antenna with
~60 1/4 wl radials. When I measured ~60 radials elevated or on the ground,
there was NO difference between the two systems.

2.) When one of the main supporters of elevated radials actually measured
an elevated radial antenna (in crude form) it was a few dB down from
predictions.

3.) When a low dipole was actually measured (a full pattern proof done in
helicopters) and compared to NEC-2 there was a 4 or 5 dB shortfall from
NEC's predictions.

4.) AM BCB station WVNJ has six elevated radials and a full proof revealed
the signal is 5 or 6 dB down from NEC models. They are now installing a
conventional system.

5.) Other broadcast stations appear to have a similar shortfall in signal
when using elevated radials.

6.) When I measure the current taper in a low horizontal wire and compare
it to NEC-4 models there is a large error. The actual current tapers much
faster than NEC predicts because of ground related losses!

The true advantage to elevated radials? Putting up the antenna is a bit
easier. ;-)

73 Tom


From [e-mail] Fri Jan 12 14:05:45 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 10 Jan 1996 06:32:46 -0500
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In article <4cuduv$[e-mail]>, [e-mail]
(Cecil A. Moore~) writes:

>
>Kurt, I'll bet you $100 that your antenna is not a perfect
>circle and that your claim is exaggerated exactly like the
>claims of the antenna manufacturers you love to criticize.
>
>

Cecil,

You could write him directly, but we all know what happens when you
disagree with the person who has his hand on the off-on switch. But I seem
to recall a West Coast fellow inviting people to write ole
Stuper....errrrr ole Sterba. Or do you fear the response would be another
example of "we told you how it is, and so it must be"?

73 Tom


From [e-mail] Fri Jan 12 14:05:47 1996
Newsgroups: rec.radio.amateur.antenna
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From: Paul Moller <[e-mail]>
Subject: Re: ? Circular Polarisation
Content-Type: text/plain; charset=us-ascii
Organization: MOTOROLA
Date: Wed, 10 Jan 1996 09:19:13 -0600
Message-ID: <[e-mail]>
To: "Koellner, Guenter" <[e-mail]>
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Koellner, Guenter wrote:
>
> Hello!
>
> I have two questions:
>
> 1) If I take two identical antennas, one horizontal, one vertical, mounted
>    without any forward offest mounted about 1 wavelenth parallel to each
>    other, what must be done to make them to produce left- and right-hand
>    circular polarisation? One thing to mention is matching the impedance,
>    and the other is to feed one antenna a quarter wavelenth later. But
>    under which circumstances which rotation direction will happen?
>

Circular polarization will occur when the phase relationship of the two
antennas is 90 degrees offset in the far field. In this case since they
are identical antennas, the feed only need be seperated by 90 degrees.
In the far field one cannot discern between the two directional antennas
placed close to each other but still seperated. Treat them as if they
were co-located on the same boom. Now, however, there is a problem!
Chances are the antennas do not have the same azmith and elevation
patterns, after all few if any yagis do. This is a general statement
about co-locating yagis and using them to generate circular
polarization, not necessarily about this side by side arrangement.

> 2) If I mount both antennas on the same boom this would not be possible
>    without adding a forward offset (lets say, 2-5cm is possible). What
>    must be done then? I expect the feedlength difference must be corrected,
>    but which value? I think it could not be (2-5cm)*velocitiy_factor, as I
>    expect the wave speed within the antenna directors field is not equal
>    to the speed of light.
>
> Please answer with Email as well as to the board. Thanks a lot in advance!
>

This is another good question. Like I said above, all you need is 90
degrees phase shilft in the far field. I have a similar situation and
here is my plan: To construct and install the antennas each with their
own feed and cable. Then in the shack I can choose horizontal, vertical,
or circular by means of a coax switch arrangement. Horizontal or
vertical are easy as all you do is choose one antenna. Circular is also
easy as all you do is use a splitter or transformenr to match the
impedance, and then feed them with 90 degree phase shift. The question
is how to determine when you have 90 degrees. I plan to build a
turnstile with a ground plane 1/4 wavelength below it to use as a
reference. Since this will be for experimental purposes only, it will be
crudely constructed and be near ground mounted only. The "circular"
yagis can then be pointed at the turnstile, watching for nearby
obstructions, and a line strecher can be inserted in one of the yagi
feeds and adjusted to give maximum coupling between the yagis and
turnstile. A piece of coax can then be cut and replace the line strecher
for a permanent installation. (I will have to borrow the line strecher).
Make sure to watch your left and right c.p. on the turnstile, as you
could get it backwards if not careful! Good luck.


> vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
>                 [e-mail]            (Internet)
>                 HTTP://WWW.SCN.DE/~KOELLNER (WWW)


From [e-mail] Fri Jan 12 14:05:48 1996
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From: "Jordi C." <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: test dont't read it.
Date: 10 Jan 1996 09:23:26 GMT
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To: news:rec.radio

test test test



From [e-mail] Fri Jan 12 14:05:49 1996
Newsgroups: rec.radio.amateur.antenna
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From: Paul Moller <[e-mail]>
Subject: Re: ? Circular Polarisation
Content-Type: text/plain; charset=us-ascii
Organization: MOTOROLA
Date: Wed, 10 Jan 1996 09:36:28 -0600
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To: "Koellner, Guenter" <[e-mail]>
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Koellner, Guenter wrote:
>
> Hello!
>
> I have two questions:
>
> 1) If I take two identical antennas, one horizontal, one vertical, mounted
>    without any forward offest mounted about 1 wavelenth parallel to each
>    other, what must be done to make them to produce left- and right-hand
>    circular polarisation? One thing to mention is matching the impedance,
>    and the other is to feed one antenna a quarter wavelenth later. But
>    under which circumstances which rotation direction will happen?
>

Circular polarization will occur when the phase relationship of the two
antennas is 90 degrees offset in the far field. In this case since they
are identical antennas, the feed only need be seperated by 90 degrees.
In the far field one cannot discern between the two directional antennas
placed close to each other but still seperated. Treat them as if they
were co-located on the same boom. Now, however, there is a problem!
Chances are the antennas do not have the same azmith and elevation
patterns, after all few if any yagis do. This is a general statement
about co-locating yagis and using them to generate circular
polarization, not necessarily about this side by side arrangement.

> 2) If I mount both antennas on the same boom this would not be possible
>    without adding a forward offset (lets say, 2-5cm is possible). What
>    must be done then? I expect the feedlength difference must be corrected,
>    but which value? I think it could not be (2-5cm)*velocitiy_factor, as I
>    expect the wave speed within the antenna directors field is not equal
>    to the speed of light.
>
> Please answer with Email as well as to the board. Thanks a lot in advance!
>

This is another good question. Like I said above, all you need is 90
degrees phase shilft in the far field. I have a similar situation and
here is my plan: To construct and install the antennas each with their
own feed and cable. Then in the shack I can choose horizontal, vertical,
or circular by means of a coax switch arrangement. Horizontal or
vertical are easy as all you do is choose one antenna. Circular is also
easy as all you do is use a splitter or transformenr to match the
impedance, and then feed them with 90 degree phase shift. The question
is how to determine when you have 90 degrees. I plan to build a
turnstile with a ground plane 1/4 wavelength below it to use as a
reference. Since this will be for experimental purposes only, it will be
crudely constructed and be near ground mounted only. The "circular"
yagis can then be pointed at the turnstile, watching for nearby
obstructions, and a line strecher can be inserted in one of the yagi
feeds and adjusted to give maximum coupling between the yagis and
turnstile. A piece of coax can then be cut and replace the line strecher
for a permanent installation. (I will have to borrow the line strecher).
Make sure to watch your left and right c.p. on the turnstile, as you
could get it backwards if not careful! Good luck.


> vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
>                 [e-mail]            (Internet)
>                 HTTP://WWW.SCN.DE/~KOELLNER (WWW)


From [e-mail] Fri Jan 12 14:05:51 1996
Newsgroups: rec.radio.amateur.antenna
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From: Neil Whiting <[e-mail]>
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Tom Bruhns wrote:
>
> Wendy Wing Chi Cheung ([e-mail]) wrote:
> :       I have a question about antenna simulation programs in
> : general.   Does anyone here collect information about most of the
> : antenna simulation programs that exist?   I am doing a quick
>
> Have a look in back issues of QST.  I think it was sometime in
> Spring, 1995, that they published a comparison of EZNEC from Roy
> Lewallen and the suite of programs from Brian Beezley (sp?).  I
> would suggest that you also look at NECWIN -- I think I got it
> right this time -- from an outfit in Pennsylvania.  It's similar
> to EZNEC but windows rather than DOS based.  I personally have
> a license for EZNEC and find it quite worthwhile.  My biggest
> wish, I guess, for these programs that wrap a nice human interface
> around NEC2 is that they include access to the surface modelling
> available in NEC2.  As far as I know, they all limit you to
> modelling wires; patch antennas are rather difficult.
>
> 73, K7ITM
Tom Bruhns wrote:
>
> Wendy Wing Chi Cheung ([e-mail]) wrote:
> :       I have a question about antenna simulation programs in
> : general.   Does anyone here collect information about most of the
> : antenna simulation programs that exist?   I am doing a quick
>
> Have a look in back issues of QST.  I think it was sometime in
> Spring, 1995, that they published a comparison of EZNEC from Roy
> Lewallen and the suite of programs from Brian Beezley (sp?).  I
> would suggest that you also look at NECWIN -- I think I got it
> right this time -- from an outfit in Pennsylvania.  It's similar
> to EZNEC but windows rather than DOS based.  I personally have
> a license for EZNEC and find it quite worthwhile.  My biggest
> wish, I guess, for these programs that wrap a nice human interface
> around NEC2 is that they include access to the surface modelling
> available in NEC2.  As far as I know, they all limit you to
> modelling wires; patch antennas are rather difficult.
>
> 73, K7ITM


From [e-mail] Fri Jan 12 14:05:52 1996
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From: Neil Fox <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Arrival angles
Date: Wed, 10 Jan 1996 13:43:49 -0500
Organization: Capital Area Internet Service [e-mail] 703-448-4470
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Now that's a challange!  You may only be able to tell if the signal is
generally to the "left" or the "right."  As for the type of antenna, a
massive beam antenna is ideal, but perhaps not practical.  There are loop
antennas you may want to consider.  They are made for direction finding,
and can be constructed for HF.

73
Neil
WA4DXC


From [e-mail] Fri Jan 12 14:05:53 1996
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From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.antenna
Subject: ? Circular Polarisation
Date: 10 Jan 96 18:48:00 GMT
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9 Jan 96 22:39:00 GMT
     [e-mail] (Koellner, Guenter) writes:
<snip>

 -1) If I take two identical antennas, one horizontal, one vertical, mounted
 -   without any forward offest mounted about 1 wavelenth parallel to each
 -   other, what must be done to make them to produce left- and right-hand
 -   circular polarisation? One thing to mention is matching the impedance,
 -   and the other is to feed one antenna a quarter wavelenth later. But
 -   under which circumstances which rotation direction will happen?

This will work fine.  What you also need is a way to reverse the
polarization if you need to do so.  The way I've seen this done is
by mounting the two antennas on the same boom.
You connect a quarter wave (less velocity factor) of RG-11 coax
to each yagi.  Each of the free ends is connected to a separate
T-connector.  The other side of each of the T-connectors is
connected together with some 95 ohm coax such as RG-133.
In other words you come from yagi 1 with RG-11 to one side of
T-connector 1, you go from the other side of T-connector 1 with
RG-133 to side 1 of T-connector 2.  You connect side 2 of
T-connector 2 to the other yagi with RG-11.
The 50 ohm coax from your rig is connect to one or the other
T-connectors depending on whether you want left-hand or right-hand
polarization.
<2 snipped>
If you want true circular polarization you will need to build a helical
antenna.  These things become prohibitively large at anything below
220MHz.  The reflective grid must be 1 wavelength square (6 feet or
so at 2 meters.)  If you want decent gain you must have six to
eight turns, each one wavelength long with a quarter wavelength pitch.

Hope this helps

Kevin, WB5RUE
[e-mail]


From [e-mail] Fri Jan 12 14:05:54 1996
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From: [e-mail] (Terry Pridgen)
Newsgroups: rec.radio.amateur.antenna
Subject: 6 mtr Antenna Plans
Date: 10 Jan 1996 19:02:35 GMT
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Looking for simple construction plans for a 6 meter j-pole and other 6
meter antennas. Please respond to: [e-mail]
73, KC4YTF

--




From [e-mail] Fri Jan 12 14:05:55 1996
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From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Arrival angles
Date: 10 Jan 1996 20:07:21 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 26
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References: <4cglbk$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com

W8JI  Tom ([e-mail]) wrote:
: In article <4ceu31$[e-mail]>, [e-mail] (Joe
: Bulger) writes:

: >Does anyone know of an antenna that is used to measure arrival angles of
: >HF signals? I would like to be able to readout arrival angles of signals
: >on 160M.

: Try a loop or ferrite rod antenna.

I'll second that.  As a trivial experiment to prove to yourself that it
works, tune a broadcast portable radio (with ferrite rod antenna) to a
strong station (near the high end of the band).  Turn it in both azimuth
AND elevation; you should find a null the depth of which depends mainly
on how steady you can hold the radio, and the stability of the environment.
Don't be surprised if you get a null deeper than 80dB, sensitive to changes
of angle of less than a degree.  There's a directional ambiguity that
can be resolved by using an additional short "whip" antenna, if you need
to.  (It's possible to use this technique to listen to a weak broadcast
station in the presence of a stronger one on the same frequency, if the
signals are coming from different enough directions.)

--
Cheers,
Tom
[e-mail]


From [e-mail] Fri Jan 12 14:05:56 1996
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From [e-mail] Fri Jan 12 14:05:57 1996
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From: Rahul Patel <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Need Mod for TR-7850 Kenwood 2m
Date: 10 Jan 1996 20:35:21 GMT
Organization: HEWLETT-PACKARD CO.
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If anyone has any mod's for my Kenwood TR-7850 2m mobile radio, I would be ver
y grateful if you
can send me a message.  Thanking you in advance.

73,

Rahul Patel - N4RWZ



From [e-mail] Fri Jan 12 14:05:58 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!firefly!kf8zn
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Continuous loaded verticals?
Date: 10 Jan 1996 22:17:07 GMT
Organization: University of Illinois at Urbana
Lines: 5
Message-ID: <4d1dt3$[e-mail]>
NNTP-Posting-Host: firefly.prairienet.org

Would like SPECIFIC info from anyone using continuous (helical wind) verticals
 on 160m. Please describe
height, winding spacing, matching network, radial system etc.
Your help is appreciated!!!
Mike kf8zn



From [e-mail] Fri Jan 12 14:05:59 1996
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From: Jeff <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: What kind of HF antena using space of apartment's balconi?
Date: 11 Jan 1996 00:34:32 GMT
Organization: UNIServe
Lines: 11
Message-ID: <4d1luo$[e-mail]>
NNTP-Posting-Host: van0111.tvs.net

[e-mail] (Gun Kim) writes:
> Hellow!
> I'm biginner of amateur radio,in South Korea.
> I have 2m and HF all band Rig.
> But I am in a difficulty to construct antena system.
> I need information for using apartment's balconi.
>
> thanks,
> DE DS1AFL 73~~
>



From [e-mail] Fri Jan 12 14:06:00 1996
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From: [e-mail] (Steve Shreeve)
Newsgroups: rec.radio.amateur.antenna
Subject: Antenna for Radio Shack CB? TRC-225
Date: Thu, 11 Jan 1996 00:40:12 -400
Organization: UC Irvine Medical School
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Radio Gurus,

I purchased 2 Radio Shack TRC-225 hand-held 5 watt CB's which claim to have a
range of several miles (even with the standard flexible antenna).  However,
when I use the CB's I can scarcely get 100 yards before the transmission is
nearly dead.  What's the deal?  (Yes, I'm using fresh batteries).  Is the
standard antenna THAT bad, that I need an "extendo"-antenna for any
respectable transmission?


From [e-mail] Fri Jan 12 14:06:01 1996
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From: [e-mail] (Bilbee)
Newsgroups: rec.radio.amateur.antenna
Subject: Bike touring and ham radio?
Date: 11 Jan 1996 02:19:16 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <4d2dlk$[e-mail]>
Reply-To: [e-mail] (Bilbee)

Can one be a ham radio antenna nerd and be into the exciting world of
bicycle touring at the same time? A resounding yes. I'm looking for a few
good men and women to join the annual bike tour along the Pacific Crest
Bicycle Trail this summer, from Lake Tahoe, CA thru Yosemite to Sequoia
Nat. Park. A weeklong trip involving rigorous touring with a limit of 10
riders. Everyone is self-supported and there is no charge. Touring hams
help keep HT communications between parts of the group and some of us do
QRP HF along the way, too. Date not yet set. If interested e-mail me at
 [e-mail]   and supply your postal address and phone number (and
callsign) and I'll put you on the mailing list. 73.

-- Bil Paul  KD6JUI, San Mateo, CA (organizer of author of Trail
guidebook)


From [e-mail] Fri Jan 12 14:06:01 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: [Q]: Diffraction loss calculation?
Date: 11 Jan 96 03:08:55 GMT
Organization: ucsd usenet gateway
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Can somebody shoot me the formulas and/or basic algorithms
for Diffraction over obstacles and irregular terrain
radio path loss calculation?
Any relating computer basic program known?
Your assistance is much appreciated!
Thanks, Danilo +


From [e-mail] Fri Jan 12 14:06:02 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 11 Jan 1996 04:17:25 GMT
Organization: INS Information Services, Des Moines, IA USA
Lines: 35
Distribution: world
Message-ID: <[e-mail]>
References: <4cuduv$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ins.netins.net

In article <4cuduv$[e-mail]>, [e-mail] (Ce
cil A. Moore~) writes:
>In the Feb '96 "Aerials" column, Kurt N. Sterba blasts antenna
>manufacturers for making outrageous claims and then turns
>around and makes an outrageous claim for his own antenna.
>
>"I fully know that the triangle will be some ... fraction of
>a dB down from a square. I myself run mine in the form of a
>perfect circle."
>
>Wow, "a perfect circle". An antenna whose height above ground
>does not vary by even an infinitesimal amount and whose diameter
>does not vary by even an infinitesimal amount. Sterba must be
>the only person in the universe with "a perfect circle" antenna.
>
*parts removed*

>also has perfect wire or else it wouldn't be "a perfect circle".
>Dang, the man and everything around him must be perfect.
>
>Kurt, I'll bet you $100 that your antenna is not a perfect
>circle and that your claim is exaggerated exactly like the
>claims of the antenna manufacturers you love to criticize.
>
>73, Cecil, KG7BK, OOTC  (not speaking for my employer)


I have trouble believing that a guy who writes about tuning up garbage cans,
grocery carts and beer can verticals and who rounds all his d.b. figures to th
e
nearest whole number REALLY believes he operates a "perfect circle"
antenna, except to mention it "tongue-in-cheek". This is his writing style: th
at
of a self-deprecating ironic sarcasm.
No offense intended (I mean that!) but you gotta get out of the laboratory
and into an English lit course.
Peace.



From [e-mail] Fri Jan 12 14:06:04 1996
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From: VE4KLM <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: E.J. Sterba Article of July 1931 ?
Date: Thu, 11 Jan 1996 10:43:20 -0600
Organization: The University of Manitoba
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: access.mbnet.mb.ca
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


I want to know how I can get hold of an article published
by E.J. Sterba in the July 1931 Issue of the Proceedings of the
Institute of Radio Engineers (starting page 1184).

The article was a detailed description of the Sterba array.

Can anyone help me ?

Maiko Langelaar
VE4KLM, Winnipeg

 ---------------------
|  SLM Software Inc.  |
| [e-mail] |
 ---------------------



From [e-mail] Fri Jan 12 14:06:05 1996
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From: <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.cb
Subject: Antron 99 ground plane
Date: 11 Jan 1996 16:42:01 GMT
Organization: CompuServe Incorporated
Lines: 38
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Content-Type: text/plain
Keywords: antron antenna
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Xref: news.epix.net rec.radio.amateur.antenna:18373 rec.radio.cb:25535


>I've read in several newsgroups that there is no performance
>increase when using the ground plane kit on a Antron 99. I am
>still wondering if using the ground plane kit will reduce
>interferance with phones and/or TVI at homes that are close to
>me? The theory being that the ground plane kit will help radiate
>my signal in more of an upward direction and not directly at a TV
>ant./phone lines of my neighbors. Does anybody have any thoughts
>on this subject that will help? Thanks in advance for your
>inputs.

>George (thunder)


I was hoping that this thread will not start again, but here we go:

The Antron 99 is a half wave antenna. A half wave antenna has a high
impedance at its base. (about 1000 ohms) There is a much lower antenna
current at its base than a 1/4 or 5/8 wave antenna, therefore it has
very little use for radials.

A 5/8 and 1/4 wave antenna has a lower base impedance thus a higher
antenna current at its base. Rf energy will tend to "spill over" the bottom
of the antenna on to the mast and anything else touching the mast.
The use of radials "de-couples" the antenna and minimizes this effect.

While there is still a small amount of RF spilling over the base of a 1/2
wave, it is minimal and the addition of a radial kit will be a waste of
money to eliminate what is practically non-existant. Sort of like putting
up a seven foot fence to make sure that your six foot neighbor won't
be able to see you when a six foot fence will do. (Yeah, I know, what
if he stands on his toes?)

Use your money for better coax, higher mast, or a TVI filter to
fix the problem

73 from Steve, Havertown, PA



From [e-mail] Fri Jan 12 14:06:06 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom4!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: Re:QST Tuner Article
In-Reply-To: [e-mail]'s message of 11 Jan 96 14:29:13 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]>
Date: Thu, 11 Jan 1996 17:15:59 GMT
Lines: 59
Xref: news.epix.net rec.radio.amateur.homebrew:12646 rec.radio.amateur.antenna:18376

Does the copyleft protect the authors from someone else using the code
in a commercial product, or just specify that all changes, as well as
the original source must be made available?

The article has got enough information to be useful as it is, both as
a kit and as food for thought, and I don't fault the ARRL for
publishing it, but it's frustrating that to do anything with that,
you'd have to reconstruct the code, instead of being able to build on
what's gone before.

It looks to me as if the MC68HC811E2 is compatible with the -A1 part
used in the article, and has 4 times as much EEPROM for the code.
This would give lots of room for additional functions.  Also, the PD0
and PD1 asynchronous serial port pins are just connected to each
other, and with the addition of an RS-232 converter could perhaps be
used to connect to a computer, or other remote controller.

I also wonder why, apparently, the unit stops tuning when it gets to a
specified level, and doesn't actually continue to find best match.

In addition, there seem to be four more A/D ports available, and I
wonder if a phase detector or other sensor could be added to make for
an even more efficient match hunting algorithm.

My preliminary checking indicates that developement hardware and
software for these microprocessors are readily available and cheap.
Check out "Nuts and Volts" or the 68HC11 microcontroller FAQ.

Also, if you just doubled the values of the capacitors and/or the
inductors, how much would you trade optimization of match for extended
capability on 160M (how much extended capability)?  This version
doesn't require the code, BTW, just the kit, a couple of capacitors,
and some wire.  If you were willing to sacrifice some of the
indicators (use an external SWR meter, say), or use the async port for
control and status, you could, I think, extend the range on 160M,
without sacrificing optimization, but this again requires modifying
the code.

I rather wonder if I'd have paid as much attention to the article if
there hadn't been so much controversy about it.
73, doug


   From: [e-mail]
   Newsgroups: rec.radio.amateur.homebrew
   Date: 11 Jan 96 14:29:13 GMT
   I would encourage authors to incorporate the "copyleft" of the Free
   Software Foundation.  This is a more restrictive copyright.  It says
   that if you modify the software for your personal use and make
   improvements, you must share those improvements freely with others.
   This is the spirit of amateur radio at its best, IMHO.

   BTW, the article was a really neat idea.  I may build one similar
   soon.

   Ray Mack
   WD5IFS
   [e-mail]



From [e-mail] Fri Jan 12 14:06:07 1996
Path: news.epix.net!news.sprintlink.net!news.tcd.net!news
From: [e-mail] (Ray D. Congdon)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: G5RV Reviews?
Date: Thu, 11 Jan 96 17:44:59 GMT
Organization: ISA-USA
Lines: 11
Message-ID: <[e-mail]>
References: <4cgjte$[e-mail]>
 <[e-mail]>
NNTP-Posting-Host: slip13.cedar.tcd.net
X-Newsreader: Quarterdeck Message Center [1.0]

Have used a number of them over the years...  Good antenna, Very forgiving.
Don't wait!  Lay it on the snow and load it up...  you will be amazed!
(It does work best up high... as do most antennas...)
73's

----
Ray D. Congdon   N7HQK
ISA-USA
5515 N. 4400 W.
Cedar City, Utah 84720



From [e-mail] Fri Jan 12 14:06:09 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: SB-201 SWR
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4cp0eg$[e-mail]> <4ctkko$[e-mail]> <4d31s5$[e-mail]>
Date: Thu, 11 Jan 1996 19:01:38 GMT
Lines: 76

In article <4d31s5$[e-mail]> jaeschke <[e-mail]> wri
tes:
>I have been struggling with the problem of matching, SWR, and
>power transfer even since I read an article by Gary Coffman
>that said that most outputs don't match the 50 ohm impedance
>since that would not be very efficient.  I have search through
>my college books on SWR and have not found one that deals with
>source impedance on the transmission line.  They all seem to
>deal with load mismatch.

Oh, I hope I didn't say *that*. What I said was that the real
(dissipative) plate resistance of the tube isn't matched to
50 ohms by the output network. If it were, efficiency couldn't
be greater than 50%. In fact, the real dissipative internal tube
resistance is *minimized* by the tube manufacturer in order to
increase efficiency. That value can be approximated from Epsat/Ipsat
for the tube (which is an operating point we'd never use in practice
unless we were using the tube as a *switch*).

Now the output network is certainly a transformer that transforms
a 50 ohm load impedance to a value that corresponds to a point on
the *desired* tube loadline (at a particular operating point).
In fact the transformed output load *is* the point on the loadline
presented to the tube at that operating point, so by *definition*
the loadline is matched to the output load by the output network,
but that's just ordinary transformer action, it doesn't mean that
the loadline is a real tangible power dissipating resistor *in* the
tube. That's backwards because the loadline is something we're trying
to *present* to the tube by the transformer action of the output network
on the output load impedance. All the chatter about "conjugate" matching
just confuses the issue.

>I am really getting confused now when I ream your comment that
>the load line of a tube is non-dissipative.  I always thought
>that it was.  Could you expand on either topic.

A tube loadline is just the line whose slope satisfies the expression

-delta(Eg1)/delta(Ep)

As you can see by inspection, that doesn't describe a resistance.
It is just a convienent way to describe the tube transfer characteristic.
It is normally presented being superposed on a graph of constant current
curves of the tube, and that's where things can become confused if you
aren't careful.

The tube current (for a tetrode) is in turn defined by

Ip = K*(Eg1 + Eg2/us + Ep/up)^3/2

Where K is a factor determined by tube geometry, Eg1 is the control
grid voltage, Eg2 is screen voltage, us is the screen amplification
factor, Ep is plate voltage, and up is the plate amplification factor.
Since Eg2 is typically fixed and up is a fairly large number, Delta Ip
is determined almost solely by the product of K and Eg1. In other words,
the tube is a current *valve* controlled by control grid voltage. The
value of Ep/Ip measured at the tube plate is not intrinsic and doesn't
represent a real dissipative resistance inside the tube. It is just a
consequence of the external load presented to the tube (as transformed
by the output network), and the control grid voltage at any given instant.

The reason a tube gets hot is just from the kinetic energy of the
electrons bombarding the plate being turned into heat. So plate
temperature is a function of Eg1 and the transformed output load
impedance (which establish the value of Ip), and Ep which represents
the accelerating potential that imparts the kinetic energy to the
electrons. Those two functions are *decoupled*, so you can't just
naively apply Ep/Ip = Rp. That's misleading at best because you can't
say Ip=Ep/Rp since Ip is determined by Eg1 and transformed RL, not
by the thermal/kinetic effect of a resistor in the tube plate.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Fri Jan 12 14:06:11 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Angle of Ground Plane Radials
Date: 12 Jan 96 01:02:39 GMT
Organization: ucsd usenet gateway
Lines: 27
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

In a message dated 96-01-11 10:27:43 EST, you wrote:

>
>On Tue, 9 Jan 1996, Charlie Fortner wrote:
>> I've seen plans for 2m using a SO-239 and some copper rods.  The
>> instructions say to bend the rods at a 45 degree angle towards the
>> ground.  I've seen commercially made 2m antennas that don't have bent
>> radials.  What does the angle  of the radials do for the signal?
>
>The easiest way for me to explain it is: the 45 degree angle is to
>make the typical home brew 1/4wave antenna come out to around 50ohm
>impedance. I am sure a lot of other people will come out with other

I do believe Tom is correct here.  With this type of simple 1/4 wave ground
plane, the radials are cut about 5% longer than the (radiator?).  With a
radial angle of 90 degrees, the impedance is around 30 ohms.  If the radials
were brought straight back (180 degrees), you would have a 1/2 wave dipole
(72 ohms).  45 degrees will give you about 50 ohms.

The antennas with radials that are not bent are probobly not 1/4 wave
antennas.  5/8 wave  antennas have a lower radiation angle, and provide more
gain than a 1/4 wave antenna.  There is no need to bend the radials, since a
matching device is already needed.  Bending would only add the manufacturing
process.

Bob
KD8WU


From [e-mail] Fri Jan 12 14:06:11 1996
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From: [e-mail] (DavidSt1)
Newsgroups: rec.radio.amateur.antenna
Subject: Radiation Resistance of end-feed, unbalanced antennas
Date: 12 Jan 1996 04:29:56 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 12
Sender: [e-mail]
Message-ID: <4d59mk$[e-mail]>
Reply-To: [e-mail] (DavidSt1)
NNTP-Posting-Host: newsbf02.mail.aol.com

Tell me if I have this right:
Given an end-fed wire tuned to resonance with a series L/C
tuner, the radiation resistance is a function of the effective
height of the wire above it's ground plane.

I'm thinking of aircraft HF antennas here.  Given the antenna is
tuned to resonance, the wire's effective height above "ground"
(the aircraft body) is small so the radiation resistance is,
at best, a few ohms.  So, given that X is tuned out, that leaves
radiation resistance plus ohmonic resistances.  Is this correct?
Thanks,
D. Stinson


From [e-mail] Fri Jan 12 14:06:13 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: 12 Jan 1996 05:25:03 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 77
Sender: [e-mail]
Message-ID: <4d5ctv$[e-mail]>
References: <4d32e9$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Jim,

In article <4d32e9$[e-mail]>, jaeschke
<[e-mail]> writes:

>I am struggling to understand SWR, power transfer, and
>matching.  This started with I read an article by Gary Coffman
>that said that most radio outputs are not matched to 50 ohms
>since that would not be efficient.  I have checked into my
>college text books and they don't deal with different source
>impedance only load impedance.

It sure is a struggle! There are two conflicting views on this. Let me try
to explain my view, let me know if anything doesn't make sense (one topic
at a time).

The tube is a varying resistance that is completely out of the circuit (in
some classes of amplifiers) for some portion of the RF cycle. The
efficiency is NOT limited by the value of load impedance (high or low),
but rather by the conduction angle of the tube. Maximum efficiency and
maximum power transfer occur at the same point in an ideal PA stage (no
parasitic losses outside the tube). Power conversion efficiency can
approach 100% if an ideal tube is far into class C at the point of maximum
power transfer!

Look closely at Thevenin's (and Norton's) model descriptions in college
reference books. You will find the rules of the models prevent their use
in talking about anything that goes on internal to any source, and
furtermore rule out their use in non-linear systems. My puzzlement is why
some of us try to use the Thevenin model to determine source efficiency in
spite of Thevenin's rules saying that can't be done. That is compounded by
trying to use it in a non-linear power converter (not a generator)
circuit. The tube is not a "source" at all, it is a time varying resistor.

Thevenin and Norton only deal with power transfer, not source efficiency
or operation. When the circuit's average impedance is matched to the load,
power transfer is maximum. It's that simple. We can have no idea what is
going on inside the black box source from using these models.

Furthermore, Norton states his model directly interchanges with Thevinin's
model if the proper values are substituted. Where does that leave the
series R model? That substitution (that every textbook indicates can
freely occur) would result in maximum efficiency with exactly the opposite
load R!!!!!!

If you can, do this simple test. Apply a safe amount of drive to a AB, B
or C class PA stage. Tune the stage for the absolute maximum power output
with that safe fixed drive level. Calculate the efficiency. Change the
load impedance up or down and re-calculate the efficiency.

In nearly all cases efficiency will exceed 50% when the stage is tuned for
maximum output. If the load impedance is varied a large amount, you will
see the efficiency and the power output BOTH fall off. The Thevenin model
does NOT work to determine efficiency.

> I agree with Gary, if you could
>use a different, lower, source impedance the power transfer
>would be much more efficient.

That's incorrect, as doing the above simple test will prove.

>Your statement about the load line of a tube being
>non-dissapative is also hard for me to understand.  I always
>thought that a tube had an operating point impedance determined
>by the average current and plate voltage.  This is certainly
>dissapative.

It's determined by the maximum available fundamental current and voltage.
Let me ask a few questions. If I had a point in a circuit that delivered
maximum power at 50 volts and the maximum current was one ampere, what
would be the optimum load impedance? If we wanted to connect a
transmission line to that point what impedance line would work most
efficiently? Why is the PA any different?

73 Tom

73 Tom


From [e-mail] Fri Jan 12 14:06:14 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 12 Jan 1996 05:25:45 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 15
Sender: [e-mail]
Message-ID: <4d5cv9$[e-mail]>
References: <4d2h90$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4d2h90$[e-mail]>, [e-mail]
(Michael A. Sterba) writes:

>I think your right here. :) Real world antenna problems are bit harder to
>deal with and
>a laboratory simulation.<grin>
>At least this is what this real "Sterba" has found.

The only problem with Sterba is he makes mistakes, and doesn't allow
anyone to correct them. That makes his column a poor forum for education,
because it everything in it is just his opinion.

It should be read for entertainment, but not for knowlege enhancement.

73 Tom


From [e-mail] Fri Jan 12 14:06:15 1996
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From: [e-mail] (Jari Jokiniemi)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: [Q]: Diffraction loss calculation?
Date: 12 Jan 1996 06:23:46 GMT
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ds10.tekla.fi
In-reply-to: [e-mail]'s message of 11 Jan 96 03:08:55 GMT


Rather than digging out the formulas I would like give a reference to
a book which deals with propagation issues (including diffraction):
David Parsons, The Mobile Radio Propagation Channel, Pentech Press,
London 1992, ISBN 0-7273-1316-9.

--
Jari Jokiniemi, [e-mail], OH2MPO, OH3BU
Tekla Oy, Koronakatu 1, 02210 Espoo, 90-8879 474


From [e-mail] Fri Jan 12 14:06:16 1996
Path: news.epix.net!mango.epix.net!will
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Fri, 12 Jan 1996 09:49:37 -0500
Organization: epix.net
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In-Reply-To: <4d5cv9$[e-mail]>


On 12 Jan 1996, W8JI Tom wrote:

> The only problem with Sterba is he makes mistakes, and doesn't allow
> anyone to correct them. That makes his column a poor forum for education,
> because it everything in it is just his opinion.
>
> It should be read for entertainment, but not for knowlege enhancement.


Tom, I wonder of you can provide any facts to back up your claim?  As a
fan of Sterba's it never occurred to me to consider him inerrant, but as
a lifetime subscriber to WORLDRADIO, I have yet to see him fail to admit
a mistake.  Maybe I have missed something.

[e-mail] - KD3XR - W F Sill, Tunkhannock, PA


From [e-mail] Fri Jan 12 14:06:18 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: 12 Jan 1996 10:12:25 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 43
Sender: [e-mail]
Message-ID: <4d5top$[e-mail]>
References: <4d32e9$[e-mail]>
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X-Newsreader: AOL Offline Reader

Hi,

We have to be careful what we say here:

>The reason a tube gets hot is just from the kinetic energy of the
>electrons bombarding the plate being turned into heat. So plate
>temperature is a function of Eg1 and the transformed output load
>impedance (which establish the value of Ip), and Ep which represents
>the accelerating potential that imparts the kinetic energy to the
>electrons. Those two functions are *decoupled*, so you can't just
>naively apply Ep/Ip = Rp. That's misleading at best because you can't
>say Ip=Ep/Rp since Ip is determined by Eg1 and transformed RL, not
>by the thermal/kinetic effect of a resistor in the tube plate.

The dissipation of a tube at any given instant of time is determined
exactly as we would for any dissipating resistance that limits the current
and voltage to the value obtained in that particular circuit element.

This reminds me of something a guy running a lead-acid battery powered
model streetcar at a train show once told me. He was using a bank of large
rectifier diodes to reduce the voltage, but complaining about battery
life. I suggested he build a switching supply to limit the motor speed,
but he retorted that he wasn't dissipating power because the diodes
weren't resistors. I asked him why the diodes were on heatsinks then, and
why the dissipation of the diodes was determined by E/I in that element of
the circuit! He went into a long explaination of what goes on inside the
diode. But despite the less than educational retort, the result was the
diodes dissipated power and produced heat just like a resistor. The power
dissipated was E*I.

If we "took a snapshot" of the circuit and looked at the tube's anode
dissipation, the power dissipated is a product of E*I at that instant. If
the anode current is one ampere, and the anode to cathode voltage is 100
volts at that instant of time, the plate dissipation is exactly 100 watts
at that instant of time.

I think all of this is a side issue of how the parameters or terms used to
describe chariteristics of a tube are defined, and not related to the real
question asked. The real issue and cause of the confusion is misuse of
models. Maximum power transfer ALWAYS occurs with a conjugate match, and
the efficiency can not be determined via Thevenin or Norton.

73 Tom


From [e-mail] Fri Jan 12 14:06:19 1996
Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Antenna for Radio Shack CB? TRC-225
Date: 12 Jan 1996 11:05:39 GMT
Organization: SRC
Lines: 16
Message-ID: <4d5fam$[e-mail]>
References: <4d2icd$[e-mail]>
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Ahhh You've been had by hype...

I remember a Motorola spec. for a power device.

(IF) you put in under Niagra Fall in January you could get 600 watts...

Anyway, the range is IDEA, and you know I bet you DONT live on the top
of K-2.  So yes, and antenna will extend yuor range.

P.S. In about 5 years, if everyone else would shup up, your radio will
be able to go around the world.  The sun spot cycle is returning!

Tom
WA1RHP




From [e-mail] Wed Jan 17 14:22:17 1996
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From: [e-mail] (John Kaufmann)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: "Doty" in new article
Date: Thu, 11 Jan 96 15:24:25 GMT
Organization: M.I.T. Lincoln Laboratory
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Distribution: world
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[e-mail] (W8JI  Tom) wrote:

>1.) When I actually measured the FS from a 80 meter vertical with four
>elevated radials, FS was around five dB down from the same antenna with
>~60 1/4 wl radials. When I measured ~60 radials elevated or on the ground,
>there was NO difference between the two systems.
>
>2.) When one of the main supporters of elevated radials actually measured
>an elevated radial antenna (in crude form) it was a few dB down from
>predictions.
>
>3.) When a low dipole was actually measured (a full pattern proof done in
>helicopters) and compared to NEC-2 there was a 4 or 5 dB shortfall from
>NEC's predictions.
>
>4.) AM BCB station WVNJ has six elevated radials and a full proof revealed
>the signal is 5 or 6 dB down from NEC models. They are now installing a
>conventional system.
>
>5.) Other broadcast stations appear to have a similar shortfall in signal
>when using elevated radials.
>

[. . .]

>73 Tom


Tom,

I've used EZNEC (based on NEC-2) to model verticals with raised radials and th
e results seem
to support  your contention.   It is claimed that EZNEC can accurately model a
ntennas with
horizontal wires close to the ground.   According to EZNEC, the gain of a  qua
rter-wave vertical
on 80 meters with four quarter-wave raised radials at heights of 10-15 feet ab
ove anything other than
perfect ground is several dB (3-4 dB if I remember correctly) below that of a
ground-mounted
vertical with perfect ground beneath it.  There is an option in EZNEC to model
 ground radials over
imperfect ground  but its accuracy is admitted to be not great unless a large
number of radials
is used.  In the latter case, EZNEC says  a ground-mounted  vertical with 100+
 quarter-wave
radials also outperforms the raised-radial vertical by several dB.   Adding se
veral  more raised
radials, increasing their length or increasing their height did not change thi
s result very much.  In fact
there was only one way I could get the gain of the raised-radial vertical to e
qual the ground-mounted
vertical- - -by adding lots of ground radials beneath the raised radials (in w
hich case why bother with
raised radials at all?) or by assuming perfect ground in the first place.

73,
John Kaufmann W1FV
[e-mail]


From [e-mail] Wed Jan 17 14:22:19 1996
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From: [e-mail] (FORREST GEHRKE)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: "Doty" in new article
Message-ID: <[e-mail]>
Date: Fri, 12 Jan 96 10:36:00 -0300
Distribution: world
Organization: Central Core BBS, 201-575-8991
Reply-To: [e-mail] (FORREST GEHRKE)
References: <[e-mail]>
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LS> He also refers to an article I've filed away and nearly forgotten:
LS> Using Elevated Radials with Ground Mounted Towers by KB8I in Sept
LS> 91, pp 77-82 IEE Trans on Broadcasting.  ".. it is possible to use
LS> four elevated radials together with a conventional ground-mounted,
LS> base-insulated tower for MF broadcasting purposes, and achieve the
LS> same level of performance which is normally obtained from a classic
LS> 120-buried-radial system."  This from NEC simulation.

In 1989 a real test was granted by the FCC at Newburgh, NY.
The vertical was 105 feet long with a 15 foot insulated ground
post and 6 1/4 wavelength raised radials at 15 feet.
Frequency 1580kHz.

Report claims field strength readings equal to 120 1/4 w.l.
ground radials.  Claim was based on computer modelling
using NEC-GS (of which I have no knowledge).

Impedance:  14.9 -j 124.8

No actual real comparison to 120 ground mounted radial test
was run.

I made a calculation of what a 0.17 wavelength vertical with
120 1/4 w.l. ground radials would be but I can't locate it
today and haven't the time to re-do it.

LS> knowledge about ham radio, etc. adds:  "George Brown, it needs to be
LS> stressed, was not adverse to elevated, artificial ground screen.  He
LS> was, in fact, the inventor of the HF/VHF artificial ground-plane
LS> antenna.  He once confessed to me over lunch that his original
LS> version used only two radials, but to satisfy early police-radio
LS> customers this was increased to four radials without significantly
LS> increasing radiation efficiency."  (My comment...these were way up
LS> in the air)

George Brown refers to this two radial vhf antenna in his memoir.
The patent assignment is to Brown, Lewis, & Epstein.  The two-radial
antenna came about to accommodate its use to tugboats in NY Harbor
as they couldn't allow the 2 radials abeam.  You have to remember
that this application was not aimed at efficiency--only something
that was good enough for the purpose.  Dr. Lewis tells me that
the impedance was nowhere near 36.5 resistive, which his modelling
tests with a solid disk showed.

Brown, in his memoir, says that this work led to his invention of
the turnstile antenna used for TV broadcasting.

 * RM 1.3 02583 * Is this yours? Your dog left it on my lawn...


From [e-mail] Wed Jan 17 14:22:20 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: "Doty" in new article
Date: 12 Jan 1996 08:34:49 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 21
Message-ID: <4d56f9$[e-mail]>
References: <[e-mail]> <4d084a$[e-mail]> <4d3a39$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

In article <4d3a39$[e-mail]>,
John Kaufmann <[e-mail]> wrote:
>According to EZNEC, the gain of a  quarter-wave vertical on 80 meters
>with four quarter-wave raised radials at heights of 10-15 feet above
>anything other than perfect ground is several dB (3-4 dB if I remember
>correctly) below that of a ground-mounted vertical with perfect ground
>beneath it.

Hi John,

Your results are really surprizing, I am sure you are aware of the fact that
the idea of raised radials has been proposed on the base of NEC simulations.
Although there is no mention of the actual NEC version in the IEEE papers by
Christmann, it has been said that he used NEC-4 or some other recent version.

Any explanation?

73, Moritz DL5UH





From [e-mail] Wed Jan 17 14:22:21 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!cencore!forrest.gehrke
From: [e-mail] (FORREST GEHRKE)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: "Doty" in new articl
Message-ID: <[e-mail]>
Date: Fri, 12 Jan 96 13:26:00 -0300
Distribution: world
Organization: Central Core BBS, 201-575-8991
Reply-To: [e-mail] (FORREST GEHRKE)
References: <4d084a$[e-mail]>
X-Newsreader: PCBoard Version 15.22
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WT> The true advantage to elevated radials? Putting up the antenna is a
WT> bit easier. ;-)

Tom, I agree with every one of your points vis-a-vis raised
radials and grounded.  But I have trouble visualizing why
an 80M vertical, for instance, would be easier to put up
with raised radials.  I'd rather have those radials lying
on the ground than trying to figure out how to keep a bunch
of radials raised above ground.


 * RM 1.3 02583 * If it ain't broke yet, let me have a shot at it....


From [e-mail] Wed Jan 17 14:22:22 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: "Doty" in new articl
Date: 14 Jan 1996 05:59:46 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 25
Sender: [e-mail]
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In article <[e-mail]>,
[e-mail] (FORREST GEHRKE) writes:

>Tom, I agree with every one of your points vis-a-vis raised
>radials and grounded.  But I have trouble visualizing why
>an 80M vertical, for instance, would be easier to put up
>with raised radials.  I'd rather have those radials lying
>on the ground than trying to figure out how to keep a bunch
>of radials raised above ground.

Hi Forrest,

Let's fact it, putting up FOUR elevated radials is a lot less expensive
and time consuming than installing 30 radials anywhere. That's my point,
the easy way out....convince yourself four in the air are perfect! Heck,
better yet, convince yourself two are enough! ;-)

I suspect the reason you had trouble visualizing how an elevated system
could be easier to install is because you allready KNEW that four radials
aren't enough, either on the ground or in the air a few feet. I suspect
the picture that flases in your mind is the same as the one I have, a
whole bunch of wire in the air or on the ground. And when we use a whole
bunch they look like hell in the air and are almost impossible to support!

73 Tom


From [e-mail] Wed Jan 17 14:22:23 1996
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From: "Jeffrey N. Gibbs" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: (no subject)
Date: 14 Jan 1996 01:28:47 GMT
Organization: AcadiaNet, Inc.
Lines: 12
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X-URL: news:rec.radio.amateur.antenna

Can anyone tell me how to build an high-gain cellular telephone antenna
for my cabin, that will allow me to have reliable communications in a
very marginal service area?  Right now, I am getting less than one bar
(of a possible four) on my car-mounted antenna.  With such a poor signal
I can't get voice calls out very well, let-alone fax/data modem calls.

Please e-mail if you know/are willing to offer advice.

THANKS!
[e-mail]




From [e-mail] Wed Jan 17 14:22:24 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news.cac.psu.edu!usenet
From: John Passaneau <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ***Ham WEB page For all people to use! Give it a TRY***
Date: Tue, 16 Jan 1996 15:47:00 -0800
Organization: Penn State University
Lines: 20
Message-ID: <[e-mail]>
References: <4df36s$[e-mail]>
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Xref: news.epix.net rec.radio.amateur.equipment:23827 rec.radio.amateur.antenna:18501 rec.radio.amateur.digital.misc:13643 rec.radio.amateur.homebrew:12755 rec.radio.amateur.misc:96988 rec.radio.amateur.policy:32577 rec.radio.amateur.space:6142

David Mclean wrote:
>
> Hello to all:
>
>     Come a take a look at my new web page. I have been working on it for
> the last 4 weeks. I have lots of thing that you will like. Some of the
> things that I have are: MODs, Swap Shop, Dfw repeter list, comment page,
> links to other good ham pages, call looks ups (updated by the sec), radio
> pricing, Links to QRZ,FCC,HRO, and many more. If you are a ham and would
> like you web page added to my list just send me e-mail. Please tell me
> what you like and dislike about the page. I want all types of comments.
> Hope you like what I have.
>
> --
>                                                     David Mclean
>                                               From The World of Hamradio
>                                                    KC5NNV is Clear!
> _________________________________________________________________________> -
------------------------------------------------------------------------
It might have been nice to put the address in the message.
John Passaneau, WB8EIY, State College Pa.


From [e-mail] Wed Jan 17 14:22:25 1996
From: Vance Campbell <[e-mail]>
Organization: Novell, Inc.
X-Mailer: Mozilla 1.1N (Macintosh; I; PPC)
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Subject: Re: ***Ham WEB page For all people to use! Give it a TRY***
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David Mclean <[e-mail]> wrote:
>Hello to all:
>
>    Come a take a look at my new web page. I have been working on it for
>the last 4 weeks.

<snip>

What's the URL?



From [e-mail] Wed Jan 17 14:22:26 1996
Path: news.epix.net!news.sprintlink.net!usit.net!news
From: [e-mail] (Robert Werner, Jr.)
Newsgroups: rec.radio.amateur.antenna
Subject: 2 meter antenna for Ford Aspire
Date: 13 Jan 1996 03:18:19 GMT
Organization: US Internet, Inc.
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I recently purchase a Ford Aspire hatchback.  I have an 2 meter mobile
I would like to mount in it.  I need a 1/4 wave antenna that does NOT
require drilling.  Can someone out there suggest an antenna?
Thanks,
Bob Werner
[e-mail]



From [e-mail] Wed Jan 17 14:22:27 1996
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From: Daniel Calzaretta <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 2 meter antenna for Ford Aspire
Date: 13 Jan 1996 16:13:54 GMT
Organization: Pacific Crest Community School
Lines: 5
Message-ID: <4d8lo2$[e-mail]>
References: <4d789r$[e-mail]>
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I use a Larson glass mount and it seems to work great.

Dan
N9BCC/7



From [e-mail] Wed Jan 17 14:22:28 1996
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From: Daniel Calzaretta <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 2 meter antenna for Ford Aspire
Date: 13 Jan 1996 16:13:34 GMT
Organization: Pacific Crest Community School
Lines: 5
Message-ID: <4d8lne$[e-mail]>
References: <4d789r$[e-mail]>
NNTP-Posting-Host: ip-pdx04-22.teleport.com
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To: [e-mail]

I use a Larson glass mount and it seems to work great.

Dan
N9BCC/7



From [e-mail] Wed Jan 17 14:22:29 1996
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From: [e-mail] (David Smith)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 2 meter antenna for Ford Aspire
Date: 13 Jan 1996 13:42:43 GMT
Organization: NLnet
Lines: 7
Message-ID: <4d8csj$[e-mail]>
References: <4d789r$[e-mail]>
NNTP-Posting-Host: terra.nlnet.nf.ca
X-Newsreader: TIN [version 1.2 PL2]

A magnetic mount seems to be the answer here.  There are lots of
manufacturers out there, most making good products.

A glass mount of course is the other way to go, but I've only seen them
in 1/2 wave formats.

Dave Smith, VO1DMS


From [e-mail] Wed Jan 17 14:22:30 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 6 meter antennas ??
Date: Fri, 12 Jan 1996 15:11:46 GMT
Organization: CyberCity of Denmark
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ken brookner <[e-mail]> wrote:

>i've ordered up a ten-tec transverter to build and am now wondering what
>types of antennas are being used on 6 meters.  i'd prefer to build
>something and i don't have room for a big yagi.

>suggestions?

>thanks!

>ken brookner, n5lpi
>[e-mail]

Hi Ken !

I have build a 2 el. Quad antenna..

The boom is very short (0,12 wavwlength) and it works very fine on
six meter.

The gain is around 7,3 dBd.

You can find more info in the book called:
All about cubical quad antennas, by William I. Orr, W6SAI &
Stuart D.Cowan, W2LX....

Regard OZ1CDE, Jan Andersen.
[e-mail].



From [e-mail] Wed Jan 17 14:22:30 1996
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From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 6 mtr Antenna Plans
Date: Thu, 11 Jan 1996 22:01:10 GMT
Organization: Inlink
Lines: 17
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[e-mail] (Terry Pridgen) wrote:

>Looking for simple construction plans for a 6 meter j-pole and other 6
>meter antennas. Please respond to: [e-mail]
>73, KC4YTF

>--


Check out the Copper Cactus on my web-page at
http://www.inlink.com/~raiar
It can be built as a mono-bander

Gary
KG0ZP




From [e-mail] Wed Jan 17 14:22:31 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 6 mtr Antenna Plans
Date: 11 Jan 1996 08:41:05 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 14
Message-ID: <4d2if1$[e-mail]>
References: <4d12gb$[e-mail]>
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In article <4d12gb$[e-mail]>,
Terry Pridgen <[e-mail]> wrote:
>Looking for simple construction plans for a 6 meter j-pole and other 6
>meter antennas.

This reminds me that in the DUBUS magazine there are new designs for
6 meter yagis by DJ9BV. They are optimized by NEC-2.

 5.90 meter boom length, 9.4 dB/d
12.90 meter boom length, 11.9 dB/d.

Good DX!

73, Moritz DL5UH


From [e-mail] Wed Jan 17 14:22:32 1996
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From: [e-mail] (Ross Alexander)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: angle of ground plane radials????
Date: 10 Jan 1996 21:57:08 GMT
Organization: Athabasca University
Lines: 19
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[e-mail] (Charlie Fortner) writes:

>I've seen plans for 2m using a SO-239 and some copper rods.  The
>instructions say to bend the rods at a 45 degree angle towards the
>ground.  I've seen commercially made 2m antennas that don't have bent
>radials.  What does the angle  of the radials do for the signal?

Nothing in particular; but it raises the feedpoint impedance from
around 37 ohms to something pretty close to 50 ie it lowers the
SWR.

regards,
Ross

ps: not that it really matters; most handies are very forgiving ditto
most mobiles.

--
Ross Alexander, ve6pdq  --  [phone]  --  [e-mail]


From [e-mail] Wed Jan 17 14:22:33 1996
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Newsgroups: rec.radio.amateur.antenna
Subject: Re: angle of ground plane radials????
Message-ID: <[e-mail]>
From: Bill Harwood <[e-mail]>
Date: Tue, 16 Jan 1996 20:27:43 GMT
Sender: [e-mail] (NAWS news admin)
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[e-mail] (Charlie Fortner) wrote:
>I've seen plans for 2m using a SO-239 and some copper rods.  The
>instructions say to bend the rods at a 45 degree angle towards the
>ground.  I've seen commercially made 2m antennas that don't have bent
>radials.  What does the angle  of the radials do for the signal?


1.  It brings the characteristic impedance closer to 50 ohm from about
72 ohm for horizontal radials.  These are very relative numbers
depending on installation and location.  The sloped radials provide a
better match.

2.  Because of item 1.  and a little fat wire effect from the four
ground wires coupling a little bit and acting like a fat couterpoise,
the bandwidth should be wider (broader).

3.  Do you get a little radiation from the radials...  well maybe.  They
increase the effective apature a little but not a lot of db improvement
for this reason.

Good Luck and angle those radials down


  \------------------------------------------------------/
   \  Bill Harwood           U play it, I'll dance it   /
    \ AB6DY                         or                 /
     \                      I'll play it, U dance it  /
      \----------------------------------------------/




From [e-mail] Wed Jan 17 14:22:34 1996
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From: [e-mail] (Rolf v/d  Meulen)
Newsgroups: rec.radio.amateur.antenna
Subject: Antenna for Ericsson NH238
Date: Mon, 15 Jan 1996 17:54:47 GMT
Organization: KCL Foundation
Lines: 5
Message-ID: <4de4e0$[e-mail]>
NNTP-Posting-Host: lee43.pi.net
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To improve the working of my handheld mobile phone i am interrested in
a 1/2 wave dipole and one director antena for the ATF 3 net (800-900)
Mhz.
Who has a solution.



From [e-mail] Wed Jan 17 14:22:35 1996
Newsgroups: rec.radio.amateur.antenna
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From: "Jason R. Rieg" <[e-mail]>
Subject: Re: Antenna Simulation Software
Content-Type: text/plain; charset=us-ascii
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Date: Fri, 12 Jan 1996 15:11:32 GMT
Lines: 43

Wendy,

I have had the opportunity to test a number of different software packages and
 have
come to the following conclusions:

ELNEC          Nice little package.  Cheap, easy to use, has given us very rel
iable
               data in the past.  MININEC based.

EZNEC          Same format as ELNEC, same author (Roy Lewallen).  It is based
on
               NEC2 and has given use some good data, but if we're in doubt, w
e
               check the data against ELNEC and go with ELNEC's results, as we
 have
               measured data against ELNEC in the past with accurate results.

MININEC        The granddaddy of them all.  Written in Basic back when dinosau
rs
               ruled the earth.  Same code as ELNEC.  Not as easy to use, thou
gh.

MININEC        Probably the worst $400 we've ever spent.  I was impressed with
 the
PROFESSIONAL   brochure.  They have some nice options, but a lot of them don't
 work
               properly.  It's Windows based and the that actually makes it mo
re
               cumbersome than something like EZNEC.  It's hase a nice geometr
y node
               transformation that could be useful if we could get good data o
ut of
               the program.  I've ran the EXACT same geometry through ELNEC an
d
               MININEC Professional and the MININEC Professional's results are

               completely wrong, sometimes giving a negative resistance as a r
esult.
               That would be really cool if we could get it to work in real li
fe.

Overall, I'd say that EZNEC is your best bet at a decent price.  It's results
haven't always lived up to our expectations, but we are modelling some pretty
radical stuff.

There was somebody up in Alaska with a package that showed some promise, but f
or the
life of me I can't remember the name of the guy or the package.  He offers a d
emo
over the net, so you might be able to troll for it on the Web.

Good luck and let me know how it goes.

--
| Jason Robert Rieg             | "listen: there's a hell of a |  ___   __o
|
| Antenna Electrical Engineer   |  good universe next door;    | ___  _`\<,_
|
| Harris Corp. / Broadcast Div. |  let's go."                  | ___ (*)/ (*)
|
| [e-mail]              |             - E.E. Cummings  | ^^^^^^^^^^^^
|




From [e-mail] Wed Jan 17 14:22:37 1996
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From: Roger A. Cox <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Antenna Simulation Software
Date: 12 Jan 1996 18:22:08 GMT
Organization: Telex Communications, Inc.
Lines: 14
Message-ID: <4d68sg$n36$[e-mail]>
References: <[e-mail]>

Wendy,

Are you looking for HAM antenna software or Electromagnetics -
Professional type?  EZNEC, ELNEC, MININEC-3, NEC for Wires, YO,
MN, AO are all great for Ham antennas.  For greatest flexibility,
you need either NEC-2 or NEC-4 from Lawrence Livermore National
Labs.  These cost about $850, but are worth it if you are
designing or analyzing antennas for your job.

If you need more info on NEC software, I can point you to the
appropriate FTP or WEB site.

Roger Cox
WB0DGF


From [e-mail] Wed Jan 17 14:22:37 1996
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From: Terry Calof <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.cb
Subject: Re: Antron 99 Ground Plane
Date: 12 Jan 1996 18:58:50 GMT
Organization: The University of Manitoba
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I'm using an A99 on my roof, with ground plane kit. The RFI is still
terrible. It gets into the intercom, telephones, and even makes my garage
door opener light flash. I wouldn't bother with it.
Terry VE4UC




From [e-mail] Wed Jan 17 14:22:38 1996
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From: Terry Calof <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.cb
Subject: Re: Antron 99 Ground Plane
Date: 12 Jan 1996 18:59:07 GMT
Organization: The University of Manitoba
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I'm using an A99 on my roof, with ground plane kit. The RFI is still
terrible. It gets into the intercom, telephones, and even makes my garage
door opener light flash. I wouldn't bother with it.
Terry VE4UC




From [e-mail] Wed Jan 17 14:22:40 1996
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From: [e-mail] (Dennis Mull2)
Newsgroups: rec.radio.amateur.antenna,rec.radio.cb
Subject: Re: Antron 99 ground plane
Followup-To: rec.radio.amateur.antenna,rec.radio.cb
Date: 11 Jan 1996 18:55:54 GMT
Organization: Nebraska Dept. of Education
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[e-mail] wrote:

: >I've read in several newsgroups that there is no performance
: >increase when using the ground plane kit on a Antron 99. I am
: >still wondering if using the ground plane kit will reduce
: >interferance with phones and/or TVI at homes that are close to
: >me? The theory being that the ground plane kit will help radiate
: >my signal in more of an upward direction and not directly at a TV
: >ant./phone lines of my neighbors. Does anybody have any thoughts
: >on this subject that will help? Thanks in advance for your
: >inputs.

: >George (thunder)


: I was hoping that this thread will not start again, but here we go:

: The Antron 99 is a half wave antenna. A half wave antenna has a high
: impedance at its base. (about 1000 ohms) There is a much lower antenna
: current at its base than a 1/4 or 5/8 wave antenna, therefore it has
: very little use for radials.

: A 5/8 and 1/4 wave antenna has a lower base impedance thus a higher
: antenna current at its base. Rf energy will tend to "spill over" the bottom
: of the antenna on to the mast and anything else touching the mast.
: The use of radials "de-couples" the antenna and minimizes this effect.

: While there is still a small amount of RF spilling over the base of a 1/2
: wave, it is minimal and the addition of a radial kit will be a waste of
: money to eliminate what is practically non-existant. Sort of like putting
: up a seven foot fence to make sure that your six foot neighbor won't
: be able to see you when a six foot fence will do. (Yeah, I know, what
: if he stands on his toes?)

: Use your money for better coax, higher mast, or a TVI filter to
: fix the problem

: 73 from Steve, Havertown, PA



From [e-mail] Wed Jan 17 14:22:40 1996
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From: George Harris <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.cb
Subject: Antron 99 Ground Plane
Date: 11 Jan 1996 15:58:51 GMT
Organization: Amp Inc. / Lytel Division
Lines: 14
Message-ID: <4d3c3r$8su$[e-mail]>
Xref: news.epix.net rec.radio.amateur.antenna:18404 rec.radio.cb:25596

I've read in several newsgroups that there is no performance
increase when using the ground plane kit on a Antron 99. I am
still wondering if using the ground plane kit will reduce
interferance with phones and/or TVI at homes that are close to
me? The theory being that the ground plane kit will help radiate
my signal in more of an upward direction and not directly at a TV
ant./phone lines of my neighbors. Does anybody have any thoughts
on this subject that will help? Thanks in advance for your
inputs.

George (thunder)

--
Don't do anything that I wouldn't, At least don't get CAUGHT!!!!


From [e-mail] Wed Jan 17 14:22:42 1996
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From: [e-mail] (Bob Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Arrival angles
Date: 13 Jan 1996 17:20:42 GMT
Organization: LI Net (Long Island Network)
Lines: 36
Message-ID: <4d8pla$[e-mail]>
NNTP-Posting-Host: linet04.li.net
X-Newsreader: TIN [version 1.2 PL2]

  At any given frequency, there are usually several paths a signal can
follow from one point to another via the ionosphere.  This means that
there will usually be not one, but several arrival angles at any given
time.  This results in multipath wave interference effects, which cause
the selective fading which is almost always present on an ionospheric signal
path.  This multipath problem also causes confusion and errors when trying
to determine the direction of a null with low-resolution directional
antennas such as loops or loopstick antennas.  For this reason, a
loopstick can not be trusted to give accurate skywave arrival-angle
information.

  A better solution would be a variable-height antenna over a good ground
screen on flat ground.  Such an antenna could be directed if necessary,
and then adjusted in height, noting the heights of nulls and optimum
reception.  Signal arrival angles can then be calculated from the antenna
lobe angles corresponding to these heights.  If necessary, angular
resolution can be increased by using a stacked combination antenna.  Bear
in mind that at 1.8 MHz, such a system might require a tower (or towers)
hundreds of feet tall!  It might actually be more practical to place the
antennas and receivers in remote-controlled model aircraft.

  If one has enough real estate, money and interest, a big multi-element
array could be built, with enough resolution to really separate and
identify the azimuth and elevation of the individual incoming components
of a signal.  This array need not be very high above the ground, but must
be large in area compared to the wavelengths of interest, and the individual
elements of the array must be fairly close to the nearby elements compared
to the wavelength of interest.  Adjustable phasing combiners can be used
to produce directional patterns favoring different directions and arrival
angles, and the information can be tabulated to show the arrival angles
of the various signal components.  If one really wanted to go all-out, a
computerized system could convert the signals from the individual antenna
elements into a real-time image.

  Bob Bruhns, WA3WDR, [e-mail]



From [e-mail] Wed Jan 17 14:22:43 1996
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From: [e-mail] (Zacharias Liangas)
Newsgroups: rec.radio.amateur.antenna
Subject: beam ant, project:Yr advice pls
Date: Mon, 15 Jan 1996 22:10:53 GMT
Organization: ME!!!!!
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Dear friends


I have a big doubt so I post this masage here

   First lemme tell you my system configuration fr the moment before I
   advise you my problem :
   I use a SONY ICF 7600D , a Lowe HF150 and a Philips Magnavox 2395
   all are digital
   - wire antennas - of 6m sloped 60 deg paralel to az 120 deg - and a
   hor wire 13 m [aralel to 15 deg az .Both are  TV antenna mast
guides
   -home brewn ATU operating 2- 7 mHz for 20 - 5 dB respectively
   Palce of Reception ; Thessaloniki 40N 23E

   Due to my interest in SEA  I have the particular interest for
   listening to the folowing radio stations and under the condidtions
   as below :

   - STM / V o Malaysia ( dir 120 dg az) in 15295 at mean levels of 2-
   3 with QRMers as
   R Liberty  fgrom 15290  at levels S4-5 ( abt 15-25 dB more)
   R F I  from 15300 at nearly same as R L
   from varius hand made account-ments I understood that a great
   amount of signal abt 50-60% is lost due to possible reflexions
   coming from the city's mountains at an angle of 270-025 deg az

-RRI Jakarta in 9680  at mean levels (not always receivable) of S1-2
   Only V of Turkey is QRMer at 9675 but not always QRMing due to very
   low mod

- R Singapore  in 6000 at mean levels  of S2to 3 with
   Deutschlandfunk in 6005 (S4) as the only QRMer or sometimes
   Radio Dubai at 6000  but at verylow level

   I asked  the experts  of my city for making a common antenna
constru
   ction for  these 3 freqs of a antenna individual per band , I also
   read  many boks abt antennas found solutions  but most of them  are
un-
   suitable  for  my  place ( they were quad - X beam  for example) as
I
   have minimal  room in  the 7  level building and possibly can use
only
   small constructions  of  no more than 4 x 4 sqm

   PLease help me , and suggest a good protype fr beam antenna(s)
under
   the above conditions
   Thank you in advance

   [e-mail]
PLEASE ADIVSE ME YOUR OPINIONS BY EMAIL ONLY !

======
test for 8-bit
µß≈ß±Θß≥ δΘ▄πΩß≥
Zakaria Liang!
(namanya untuk kawan sahaja!)



From [e-mail] Wed Jan 17 14:22:44 1996
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From: [e-mail] (Jones Stephen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Butternut 80/40 or mfj 1792 or ? for 80/40?
Date: 11 Jan 96 00:10:17 GMT
Organization: ucsd usenet gateway
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hi All,
I have been reading the mail for a few weeks as am new to internet.  I have
antennas for 6m and 10m, which are my main bands (6 ele Y 6m and 5 ele Y 10m o
n
12 metre tilt over mast).  I have a two acre plot with the house at the north
west side of what is a rectangle plot. I like 80m dx and am considering buying
 a
Butternut
HF2v to put in the middle of the field with radials etc to give me low angle
radiation on 80 and 40m.  Is this the best solution? I notice that MFJ have
brought out a 33 ft 40/80m vertical > has anyone tried one or has it been
reviewed or compared with the Butternut?  Would I be better putting up a wire
antenna, using the 2 acres available? I have thought about putting a pole up a
t
the south east side of the rectangular plot and running out
a one wave length wire for 80m, which I would use for 160,80, 40, 30, 17, and
15m with a tuner. Would the main lobes on 80m (Wire running north north west >
south south east) be to the north west (for states) and
north east (for VK,JA etc)? I could probably get the wire up about 50ft withou
t
spending anywhere near the cost
of a Butternut HF2v. Other alternatives I have thought about are a 66ft guyed
vertical made out of three 20ft alu
scaffolding poles with radials in the middle of the field (But we get high win
ds
here on the Island of Anglesey) or a similar 60ft mast to support a 160m dipol
e,
or inverted V, and/or 80m slopers (but without any sophisticated switching
systems as I am not very technically minded!).

Any comments/suggestions would be gratefully received.
 Happy New Year from Steve GW0GEI
[e-mail]



From [e-mail] Wed Jan 17 14:22:45 1996
Path: news.epix.net!news.sprintlink.net!siemens!news.ecn.bgu.edu!feenix.metronet.com!news
From: ken brookner <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: butternut hf9v-x vs. hy-gain dx77 ??
Date: Sun, 14 Jan 1996 09:04:27 -0600
Organization: Texas Metronet, Inc  (login info (214/705-2901 - 817/571-0400))
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: fw19.metronet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b5 (X11; I; Linux 1.2.13 i486)
CC: kenb

i'm looking to purchase a multiband vertical and am tentatively down to
two choices: the butternut hf9v-x with the CPK counterpoise kit or the
hy-gain dx77.

i wish that i had room for a radial system, but i live on a very wooded
lot with a lot of rockwork around.  there's just not enough room to run
long radials.  i have a storage shed that has some clear space above it
so i could roof or mast mount a vertical there.  it'd clear the trees by
five or six feet on one side.  the alternative spot is a grassy area
roughly 30 feet by 45 feet, but it's a low spot on the lot and bordered
by the house, a wooden fence, and the shed.  if i used it, i'd have to
ground mount.

i realize that multiband verticals tend to be compromise solutions, but
long dipoles (although i do have a 40 meter dipole up) are really out of
the question.  i can't mount them as high as they really out to be.

so, i'm looking for experiences with the hf9v-x with the counterpoise
kit and also with the dx77.  i've just upgraded and am anxious to get
under way.  all input is appreciated!

73
ken brookner, n5lpi
[e-mail]


From [e-mail] Wed Jan 17 14:22:46 1996
Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!news.tacom.army.mil!ulowell.uml.edu!tribune.meitca.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!in2.uu.net!news.acadia.net!usenet
From: "Jeffrey N. Gibbs" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Cell phone antenna plans?
Date: 14 Jan 1996 01:39:15 GMT
Organization: AcadiaNet, Inc.
Lines: 12
Message-ID: <4d9ms3$[e-mail]>
NNTP-Posting-Host: rck3.acadia.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12(Macintosh; I; PPC)
X-URL: news:rec.radio.amateur.antenna?ALL

Can anyone tell me how to build an high-gain cellular telephone antenna
for my cabin, that will allow me to have reliable communications in a
very marginal service area?  Right now, I am getting less than one bar
(of a possible four) on my car-mounted antenna.  With such a poor signal
I can't get voice calls out very well, let-alone fax/data modem calls.

Please e-mail if you know/are willing to offer advice.

THANKS!
[e-mail]




From [e-mail] Wed Jan 17 14:22:48 1996
Path: news.epix.net!news.sprintlink.net!nwgw.infi.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Extended Double Zepp designs
Date: 11 Jan 1996 17:58:15 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 24
Distribution: world
Message-ID: <4d3j3n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: scorpion.ch.intel.com

In article <[e-mail]>, Pete Soper <[e-mail]> wrote:

>Could anybody that has built the EDZ from the Handbook design comment about
>whether the feedpoint impedance came out right? Am I missing something about
>EZNEC in this situation, or is the model on target? I'd like to avoid
>the inductance stub but would also like to plan for it if it's going to be
>needed.

Hi Pete, you've found the problem with models. No two antennas or locations
are exactly alike. How about a procedure instead for perfectly tuning your
antenna? Build a 6" piece of ladder-line, shorted on both ends and with
a flashlight bulb soldered midpoint of one side. This will give you an
indication of where the current nodes are (bright = current maximum). With
a longer matching section (start with 80 degrees), load up your antenna
as best you can with a tuner. Use the pickup loop to find the current node.
Mine is at 72 degrees on my 20m EDZ. Cut the ladder-line a couple of feet
longer than the current node. Use a choke on your coax and cut a few inches
at a time off the matching section until you achieve minimum SWR at the
transmitter. If you are extremely lucky, your SWR will be 9:1 on the ladder-
line so the impedance at the end of the matching section will be exactly
50 ohms. In any case, an SWR of below 1.4:1 should easily be achieved.
Anything below 2:1 is probably acceptable to your transmitter.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Wed Jan 17 14:22:49 1996
Path: news.epix.net!news.sprintlink.net!news.interport.net!usenet
From: Michael Neidich <[e-mail]>
Newsgroups: rec.antiques.marketplace,rec.antiques,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.shortwave,rec.radio.swap,rec.radio.scanner
Subject: FS: '34-'35 Radio News Magazines
Date: Sat, 13 Jan 1996 15:18:09 -0800
Organization: Interport Communications Corp.
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: neidich.port.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)
Xref: news.epix.net rec.antiques.marketplace:11511 rec.antiques:32690 rec.radio.amateur.equipment:23732 rec.radio.amateur.misc:96869 rec.radio.amateur.antenna:18431 rec.radio.shortwave:68808 rec.radio.swap:55176 rec.radio.scanner:43738

For sale:  5 issues in perfect condition, "Radio News & Short Wave Radio"
Nov. '34, Dec. '34, Jan. '35, Feb. '35, Apr. '35.  $25 ea. ppd.
First come first served.  Enclose s.a.s.e. and I will return your check.
 See what radio listening was 60 years ago!
K2ENN


From [e-mail] Wed Jan 17 14:22:50 1996
Path: news.epix.net!news.sprintlink.net!news.oz.net!news.wwa.com!news
From: {Gary} KF9CM [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: FS: Vhf High Power Duplexer
Date: 13 Jan 1996 02:17:20 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
Lines: 26
Message-ID: <4d74ng$[e-mail]>
NNTP-Posting-Host: vh1-035.wwa.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)

I have for sale a Sinclair 4 cavity  high power VHF duplexer Model# Q-202GC. T
o my
knowledge it's never been used.  The cavities are inclosed in a steel cabnet w
ith
(3) three conectors on the side.  The frequency tuning range is from 132 to 17
4 Mhz
and I have the complete tuning manual.

The Electrical Specifications are as follows:

INSERTION LOSS= Tx 1.5 db
                             Rx 1.5 db
ISOLATION, Tx Noise at Rx frequency       = 80 db
                  Tx Frequency at Rx Terminal   = 80db

MINIMUM ISOLATION Between Tx and Rx Frequencies = 50db

MINIMUM SEPARATION  = 500Khz


This is a top of the line duplexer and lists from Sinclair for $1730.... I wil
l take $850
or best offer. This is for local pickup or I can deliver within a 100 mile rad
ius of
Chicago Il.


You can "E" mail me at [e-mail]





From [e-mail] Wed Jan 17 14:22:51 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.dacom.co.kr!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Scott Hopta )
Newsgroups: rec.radio.amateur.antenna
Subject: Gap Antennas
Date: 16 Jan 1996 07:11:00 GMT
Organization: Netcom
Lines: 17
Message-ID: <4dfj24$[e-mail]>
NNTP-Posting-Host: als-il1-27.ix.netcom.com
X-NETCOM-Date: Mon Jan 15 11:11:00 PM PST 1996

Hello Everyone:

I looking at purchasing a vertical antenna and was wondering if anyone
has used any of the Gap antennas and if you can tell me how they
perform.

I saw thier add in the December QST and like the idea of no traps ...
etc.

It looks like it also has a bigger band width then other verticals.

Any thoughts would be appreciated.

Thanks

Scott Hopta (N0NXY)



From [e-mail] Wed Jan 17 14:22:51 1996
Path: news.epix.net!news.sprintlink.net!tncnet.com!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!columba.udac.uu.se!sabik!t90jwe
From: [e-mail] (Johan Wennerberg)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GPS antenna design
Date: 15 Jan 1996 15:57:25 GMT
Organization: A poorly-installed InterNetNews site
Lines: 8
Message-ID: <4ddth5$[e-mail]>
NNTP-Posting-Host: sabik.tdb.uu.se
X-Newsreader: TIN [version 1.2 PL2]

I would like some hints on constructing antennas and
antenna amplifiers for my Garmin 45 GPS receiver.

If anyone have information on where I can get circuit
descriptions I would be grateful to know.

Johan Wennerberg
email: [e-mail]


From [e-mail] Wed Jan 17 14:22:52 1996
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!news.pixi.com!usenet
From: Pat & Adaire Mason <[e-mail]>
Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna
Subject: Great circle programs:  Internet link
Date: Sat, 13 Jan 1996 12:48:34 -1000
Organization: Pacific Information eXchange, Inc.
Lines: 33
Message-ID: <[e-mail]>
NNTP-Posting-Host: godzilla20.pixi.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.0b3 (Win95; I)
CC: [e-mail]
Xref: news.epix.net rec.radio.shortwave:68831 rec.radio.amateur.antenna:18441

Aloha....

As promised in a former article, here is the info regarding great
circle computational programs on the 'Net:

        Location:  Navigation Archive Directory
                   http://www.ronin.com/navigation/archives.html

I found a couple of good programs there.  One, called "Bearing"
has a table full of callsign prefixes (ham) and latlon for many
cities worldwide.  It does calculate bearing, but seems to not
enjoy crossing the date line and gives strange results there.
However, it seems OK if you are not crossing the line, and its
database of coordinates is a great reference.

My favorite is ANSER's "Way2go", in which you type in coordinates,
either decimal form or DMS and you can compute the bearing and
distance.  Or if you know the bearing and distance and the origin,
you can get the target coordinates.  Anyway, it works the best and
gives good results, even over the date line.  I generally pull up
Bearing and get my coordinates from them and use Way2go for the
computation.  Both files are shareware and are $7 and $15
respectively.  Out here in the Pacific, such programs are well
worth it for me, as I do not have a Great Circle Map.

If anyone finds these useful, I'd be interested to know.

Happy DX....

Patrick Mason
National Radio Club Member
Mililani, Hawai'i
[e-mail]


From [e-mail] Wed Jan 17 14:22:53 1996
Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.internetmci.com!news.texas.net!chilesp
From: [e-mail] (Pat Chiles)
Newsgroups: rec.radio.amateur.antenna
Subject: HELP  WITH BEVERAGE ANTENNA MADE FROM SLINKIES
Date: 14 Jan 1996 02:29:20 GMT
Organization: Texas Networking, Inc.
Lines: 5
Message-ID: <4d9pq0$[e-mail]>
NNTP-Posting-Host: chilesp.intrepid.net
X-Newsreader: News Xpress Version 1.0 Beta #3

I would appreciate it if someone could supply me with a magazine
reference or information on how to build beverage antennas using toy
slinkies.  One local ham has given me info on the design he uses for
an 80 foot antenna.  I am trying to locate additional information.
Direct reply can be sent via [e-mail]. Pat, AA8NY


From [e-mail] Wed Jan 17 14:22:54 1996
Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!uunet!in1.uu.net!news.spss.com!uchinews!vixen.cso.uiuc.edu!howland.reston.ans.net!usc!news.cerf.net!ni1.ni.net!xband.ni.net!user
From: [e-mail] (J. L. Blanton)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HELP  WITH BEVERAGE ANTENNA MADE FROM SLINKIES
Date: Sun, 14 Jan 1996 10:21:04 -0800
Organization: Network Intensive
Lines: 17
Message-ID: <[e-mail]>
References: <4d9pq0$[e-mail]>
NNTP-Posting-Host: xband.ni.net

In article <4d9pq0$[e-mail]>, [e-mail] (Pat Chiles) wrot
e:

> I would appreciate it if someone could supply me with a magazine
> reference or information on how to build beverage antennas using toy
> slinkies.  One local ham has given me info on the design he uses for
> an 80 foot antenna.  I am trying to locate additional information.
> Direct reply can be sent via [e-mail]. Pat, AA8NY

A beverage using slinkies?  That doesn't sound right.  The beverage
antenna is a travelling wave antenna that is essentially a leaky
transmission line.  It works on different principles than antennas that
benefit from inductive loading.  An antenna using a slinky might tune up
and radiate halfway well but I don't think it would be a true beverage
antenna.

73,
Lee, WA8YBT/6


From [e-mail] Wed Jan 17 14:22:55 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in2.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: "C. J. Hawley" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help for 450 ohm  feed Zeep antenna
Date: Sun, 14 Jan 1996 08:33:37 -0600
Organization: University of Illinois at Urbana
Lines: 20
Message-ID: <[e-mail]>
References: <4d2kq1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: antwerp-4.slip.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b5 (Win95; I)

Cecil Moore wrote:
>
> Frits Jensen <[e-mail]> writes:
>
> >I intend to hang up a dipol "as long as possible, ca. 150ft", and feed it w
ith
> >450 ohm ladderline. The feeder will be about 100ft long. I have a FC901 tun
ersnip
> I've had a lot of experience with this type of antenna. My present
> antenna is the best I've ever had. The secret of it's ease of use
> and performance is a few stubs which are switched in automatically
> depending on the band. The band info out of my IC-745 is monitored
> by some logic and switches in the correct stub automatically. The
> stub kills the reflections at the stub connection point and from
> there to the balun, the line is flat. No more balun losses, no more
> antenna tuner losses. The improvement is amazing.
>
> 73, Cecil, KG7BK, OOTC

This is interesting. I thought that the one you described previously was passi
vely
switched. Could you tell us more (numbers)?
73, Chuck, KE9UW


From [e-mail] Wed Jan 17 14:22:56 1996
Path: news.epix.net!news.sprintlink.net!news.ecrc.de!news.mch.sni.de!horus.mch.sni.de!news
From: [e-mail] (Frits Jensen)
Newsgroups: rec.radio.amateur.antenna
Subject: Help for 450 ohm  feed Zeep antenna
Date: 11 Jan 1996 09:21:05 GMT
Organization: SNI
Lines: 10
Message-ID: <4d2kq1$[e-mail]>
NNTP-Posting-Host: potd1231.mch.sni.de
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.7

I intend to hang up a dipol "as long as possible, ca. 150ft", and feed it with
450 ohm ladderline. The feeder will be about 100ft long. I have a FC901 tuner
wich do not accept open wire. What do I do. 6:1 ballun?. What type of core,
and how do I wind it up (diagram). Will it handle 1kw? Can I expect decent
results on 160M with the antenna 50 ft up in the air?

Hpe it was no to many questions HI.

Best ┤73 de DL4MHU, OZ2Q Frits in Munich



From [e-mail] Wed Jan 17 14:22:57 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help for 450 ohm  feed Zeep antenna
Date: Sun, 14 Jan 96 12:32:19 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 29
Message-ID: <[e-mail]>
References: <4d2kq1$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: bos1d.delphi.com
X-To: "C. J. Hawley" <[e-mail]>

"C. J. Hawley" <[e-mail]> writes:

>This is interesting. I thought that the one you described previously was pass
ively
>switched. Could you tell us more (numbers)?

Hi Chuck, Passive switching was, as W8JI put it, "a pain". And it's not
logical for someone who works for Intel to be satisfied with passive
switching. :-)  On my 102 ft dipole fed with 300 ohm home-made open feed
line, the parallel stub points for 40m and 20m through 10m all fall within
a 10 ft section from 75-85 feet from the antenna. I got a 10 ft piece of
1x2 board and mounted the final 300 ohm section rigid on my patio. I interface
there to the 4:1 balun and coax. I picked up a bunch of open-frame relays
for $3 each suitable for switching my 600w. They have 24vdc coils but I also
picked up a $3 transformer at the same surplus place. The feed line is mounted
on one side of the 1x2 and the relays and stubs are mounted on the other. A
multi-conductor cable runs the length of the 1x2 and carries the 24vdc from
the shack to the relays. My IC-745 automatically puts out 1v for 10m, 2v for
12m, ... 8v for 160m. A few comparitors drive 2n2222's to deliver ground for
one of the relays at a time. I just got it operational last night and it
works great. At the shack, it looks like the antenna is resonant and near-
perfectly matched on all the bands - and it is!!!

73, Cecil, KG7BK, OOTC

PS: The 75m stub point is 35-40 ft. from the antenna and requires a relay or
two mounted at that point so 75m is an exception to the relays on the patio.
Same holds true for 30m but I haven't equipped my system for that band. One
advantage of this system is one can chose not to use a stub on unfrequently
accessed bands and revert to the antenna tuner on those bands.


From [e-mail] Wed Jan 17 14:22:59 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!van-bc!unixg.ubc.ca!nntp.cs.ubc.ca!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help for 450 ohm  feed Zeep antenna
Date: Sun, 14 Jan 96 21:06:34 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 44
Message-ID: <[e-mail]>
References: <4d2kq1$[e-mail]> <[e-mail]> <4dc518$[e-mail]>
NNTP-Posting-Host: bos1g.delphi.com
X-To: wynnt <[e-mail]>

wynnt <[e-mail]> writes:

>Are you switching in closed or open stubs or both?  How do you size
>the stubs? Are they 450 ohm line as well?  One stub required for each
>band?  How broadbanded are the stubs?  How about some ASCII art to
>describe the setup?  A 1/4 wave stub on 80 meters could get unweildy.
>How do you handle the length?

Stubs are both closed and open and I also use parallel capacitors
instead of open stubs for the lower bands.  I size the stubs from
a Smith chart, make them longer than necessary, and start chopping
while monitoring the 50 ohm SWR.  All my transmission lines are
300 ohms, even the #10 and #12 bare copper runs.  In general, one
stub or cap is required for each band.  I define bandwidth as the
frequencies between SWR points of 3:1. On 75m it is 200 kc and a
little better than that on 40m.  On 20m one stub covers the entire
band because the 102 ft dipole is resonant there.  I'll probably
install two sets of parallel caps on 75m.  ASCII art is not
necessary.  Here are the locations and stub lengths for my 102 ft
dipole at 30 ft high fed with 300 ohm ladder-line having a VF of
0.80.  All locations are measured from the antenna. At about 85
ft, I have a 4:1 balun and then coax the rest of the way to the
shack.

75m - parallel 260 pf cap at 36 ft, 40m - 6 ft shorted stub at 82
ft, 30m - 4 ft shorted stub at 54 ft, 20m - 7 ft shorted stub at
77 ft, 17m - 80 pf parallel cap at 79 ft, 15m - 2.2 ft shorted
stub at 82 ft, 12m - 6 ft open stub at 77 ft., 10m - 5.5 ft open
stub at 81 ft.

102 ft is the standard G5RV length.  Many hams have discarded
their coax in favor of 300 ohm ladder-line.  For those hams, the
above figures may be close (but no cigar).  For hams with
different length dipoles, ELNEC or EZNEC will give a reasonable
approximation to the starting points. After installing the stubs
or caps, I am no longer at the mercy of the unknown. I know I
am getting low losses in my balun and tuner or pi-network.

TechnoLogic Concepts ([e-mail]) is working on an
application note on this subject which should be available in
about a month. They will also have available pickup loops and
100w 300 ohm dummy loads.

73, Cecil, KG7BK, OOTC


From [e-mail] Wed Jan 17 14:23:00 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.uoregon.edu!news.orst.edu!news.cs.indiana.edu!mcmcnews.cr.usgs.gov!news.er.usgs.gov!stc06.ctd.ornl.gov!cs.utk.edu!gaia.ns.utk.edu!usenet
From: wynnt <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help for 450 ohm  feed Zeep antenna
Date: 14 Jan 1996 23:53:12 GMT
Organization: University of Tennessee
Lines: 21
Message-ID: <4dc518$[e-mail]>
References: <4d2kq1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: tchm02a13.rmt.utk.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Cecil Moore <[e-mail]> wrote:

>
>I've had a lot of experience with this type of antenna. My present
>antenna is the best I've ever had. The secret of it's ease of use
>and performance is a few stubs which are switched in automatically
>depending on the band.
>
>73, Cecil, KG7BK, OOTC

Hmmm, unlike some of the other fluster, bluster and blather that goes on here,
 when
*you* say "...the best..." it means something.  Please tell us more about this
 setup.
Are you switching in closed or open stubs or both?  How do you size the stubs?

Are they 450 ohm line as well?  One stub required for each band?  How broadban
ded
are the stubs?  How about some ASCII art to describe the setup?  A 1/4 wave st
ub
on 80 meters could get unweildy.  How do you handle the length?

Best regards,
wynnt




From [e-mail] Wed Jan 17 14:23:01 1996
Path: news.epix.net!news.sprintlink.net!news.seanet.com!debenglish.seanet.com!debenglish
From: [e-mail] (Dennis E. English)
Newsgroups: rec.radio.amateur.antenna
Subject: Help to design an AM antenna for remote areas
Date: Sat, 13 Jan 1996 23:23:30 GMT
Organization: OSD, Inc.
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: debenglish.seanet.com
Summary: I need help designing an antenna for AM listening in remote areas
Keywords: Antenna
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

Hello everyone,

I am new to using news groups so please be patient.

I saw an article about 15 years ago that described how to build an AM Band
antenna for use in remote areas.  The plans told of a homemade coil that had a

ground on one end and an antenna on the other.  It told the length of the
antenna wire, type and gauge.   The coil is placed in proximity of an AM radio

and it boasts the signal.

Does anyone out there know how to design one of these?  Or, can you tell me
where to look for design data?

Thanks,


From [e-mail] Wed Jan 17 14:23:02 1996
Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!sundog.tiac.net!shore!news
From: [e-mail] (Jim Martin)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HELP!  R-7 Problem?
Date: Tue, 16 Jan 1996 05:36:16 GMT
Organization: WK1V
Lines: 15
Message-ID: <4df2td$[e-mail]>
References: <[e-mail]> <4chkv1$[e-mail]> <4cq94p$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: slip-7-22.shore.net
X-Newsreader: Forte Free Agent 1.0.82

>:Bret McKee ([e-mail]) wrote:

>:: I had a trap die (open) in my R7 this fall.  The antenna worked fine on
>:: 10/12/15 meters, but had an infinite SWR on all the lower bands.  The 17
>:: meter trap was to blame, and Cushcraft was very responsive.  If your
>:: antenna will not load up on 10 meters, you don't have any open traps,
>:: because the 10 meter element doesn't use any traps, although it still
>:: goes through the mystic black box at the bottom.

Now you know what happens to an R7 when you use a transmatch and
operate it on 80 meters....wonder if you told Cushcraft that is
what you did...? :)

       jjm



From [e-mail] Wed Jan 17 14:23:04 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!microvst.demon.co.uk
From: "Anthony R. Gold" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HELP!! Why is it that....
Date: Sat, 13 Jan 96 09:30:24 GMT
Organization: Microvest Limited, London
Lines: 21
Message-ID: <[e-mail]>
References: <4d722c$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: microvst.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: microvst.demon.co.uk

In article <4d722c$[e-mail]>
           [e-mail] "Randy Seacat" writes:

> Something is wrong, I have a g5RV, and suddenly, its not working correctly.
> I have checked all connections, all seem ok.
>
> Here is the deal.
>
> When I connect the sheild side of the coax to the tuner, ALLMOST ALL my recv
.
> goes away. Running just the center of the coax works awsome.
>
> Whats up here?

Check with a VOM for a short between your coax inner and braid.

Regards,
--
   Tony - G3SKR / AA2PM                  email: [e-mail]
                                                [e-mail]
                                        packet: g3skr@n0ary.#nocal.ca.usa.na


From [e-mail] Wed Jan 17 14:23:04 1996
Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news1.halcyon.com!coho!ki7zd
From: [e-mail] (Randy Seacat)
Newsgroups: rec.radio.amateur.antenna
Subject: HELP!! Why is it that....
Date: 13 Jan 1996 01:31:56 GMT
Organization: Northwest Nexus Inc.
Lines: 20
Message-ID: <4d722c$[e-mail]>
NNTP-Posting-Host: coho.halcyon.com

Hello,

Something is wrong, I have a g5RV, and suddenly, its not working correctly.
I have checked all connections, all seem ok.

Here is the deal.

When I connect the sheild side of the coax to the tuner, ALLMOST ALL my recv.
goes away. Running just the center of the coax works awsome.

Whats up here?

THanks for any and all help


--
/-/-/  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | Amateur Radio Station                       Inet: [e-mail]
  | KI7ZD
  | WWA  CN87  73's    _._ .. __... __.. _..   "If RST > 519, Reduce Power!"


From [e-mail] Wed Jan 17 14:23:06 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!raynet.demon.co.uk
From: Greg Mossop <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: HELP: Patch Antenna Design.
Date: Sat, 13 Jan 96 22:00:07 GMT
Organization: West Cheshire RAYNET
Lines: 22
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: raynet.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.30
X-Mail2News-Path: raynet.demon.co.uk

Hi,
  I am trying to make a microstrip patch antenna, initially to be linearly
polarised on the 70cm band and then perhaps a little play with circular
polarisation.
  I have had one attempt so far, etching a square patch onto fibre glass PCB.
I calculated the velocity factor and made the patch an electrical quarter
wavelength square fed with 50 ohm microstrip in the middle of one side.

  Well ... the SWR is sky high & just to prove the point it doesn't even seem
to hear the local repeater :-(
  Can anyone point me to a reference for the design of patch antennas ? Most
of the books I have got analyse the performance of these antennas but are a
little short on practical construction data.

Tnx.

--
+-------------------------------------+---------------------------------------
+
| Greg Mossop G0DUB                   | 'Even logic must give way to physics'
|
| Internet: [e-mail]  |        - Spock - Star Trek VI
|
+-------------e-mail [e-mail] for PGP2.6i key-------------------
+


From [e-mail] Wed Jan 17 14:23:06 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!gatech!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!nwfocus.wa.com!news.nas.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: How high?
Date: Sun, 14 Jan 1996 08:09:57 GMT
Organization: Network Access Services, Inc.
Lines: 5
Message-ID: <4dadnp$[e-mail]>
NNTP-Posting-Host: 204.57.139.114
X-Newsreader: Forte Agent .99c/32.126

I have a TV antenna that is in a wide open cow field but doesn't pick up very
good reception.  Their aren't any trees blocking the antenna, which is about 3
0 ft. high, but I still wonder if I might
pick up some better signals if I raise the antenna up higher.  How much will t
his help?

Thanks,



From [e-mail] Wed Jan 17 14:23:08 1996
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!degreene
From: [e-mail] (David Greene)
Newsgroups: rec.radio.amateur.antenna
Subject: HT antennas
Date: 15 Jan 96 21:16:13 GMT
Organization: Heurikon Corporation
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: copernicus.heurikon.com
Summary: HT antennas
Keywords: HT antennas
X-Newsreader: NN version 6.5.0 #16 (NOV)

Hello,

I'm looking for suggestions for a good aftermarket dual band
(144 & 440) HT antenna for improved performance over the stock
antennas, if that is possible.  There are some in the catalogs,
but the gain claims seem to be exagerated, so it's difficult to
determine what the better one's are.

I did see some that are rather large (telescoping).  Are there any
problems with coneecting these to the smaller HT's (ie. as in breaking
the connector).

Thanks,
Dave
AA9BI

[e-mail]


--

Dave Greene          Heurikon Corp.       [phone]


From [e-mail] Wed Jan 17 14:23:09 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!EU.net!Portugal.EU.net!news.rccn.net!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: I'm looking for info on putting up antennas.
Date: 16 Jan 1996 12:05:03 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 19
Message-ID: <4dg49f$[e-mail]>
References: <4df1f9$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>I am wanting to put up a beam antenna for 2m.  I was wondering what
>information is available on the net concerning this subject
>(gudilines, advice, how-to's, etc.)  Thanks.

No, there is none. And there is no reason for having one, since the general
information can be found in many books amd journals, which have as yet not
been fully rendered obsolete in cyberspace.

However, if you specify your question as follows, someone might be able to
help:

        What do you want to work? FM? SSB? OSCAR?

        What boom length and height above surrounding obstacles
        are practical for you?

        Buy or build?

73, Moritz DL5UH


From [e-mail] Wed Jan 17 14:23:09 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Gerald Phillips)
Newsgroups: rec.radio.amateur.antenna
Subject: I'm looking for info on putting up antennas.
Date: Tue, 16 Jan 1996 02:13:06 GMT
Organization: Netcom
Lines: 7
Message-ID: <4df1f9$[e-mail]>
NNTP-Posting-Host: ix-tf3-25.ix.netcom.com
X-NETCOM-Date: Mon Jan 15  6:10:49 PM PST 1996
X-Newsreader: Forte Free Agent 1.0.82

I am wanting to put up a beam antenna for 2m.  I was wondering what
information is available on the net concerning this subject
(gudilines, advice, how-to's, etc.)  Thanks.

KE4MBD




From [e-mail] Wed Jan 17 14:23:11 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!newserve!ub!galileo.cc.rochester.edu!alfalfa.pas.rochester.edu!bill
From: [e-mail] (Bill VanRemmen)
Subject: Info request on DDRR antenna
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: alfalfa.pas.rochester.edu
Organization: University of Rochester Computing Center
X-Newsreader: TIN [version 1.2 PL0]
Date: Thu, 11 Jan 96 18:54:30 GMT
Lines: 19

I am thinking of building a DDRR antenna for 10 meters since I live in an
apartment with a 'no outside antenna' policy.  It looks like the 10m
version in the ARRL Antenna Book will just about fit on TOP of the air-
conditioner box, with some overhang.  I figure, if it doesn't look like
an antenna from the ground, maybe no one will complain.

Does anyone have any experience with this design?  Any idea how it performs
versus a dipole?  Is the radiation vertical or horizontally polarized?
Any problem with putting a 2m ring inside the 10m ring?

--

                My opinions.  No one elses.  Get your own!
-----------------------------------------------------------------------------
Oh, I'm a sysadmin, and I'm ok.         | Bill VanRemmen, KA2WFJ
I work all night and I work all day.    | [e-mail]
I knock back Cokes, I skip my lunch,    | http://www.pas.rochester.edu/~bill
I'm glued to the VDT!                   |
-----------------------------------------------------------------------------


From [e-mail] Wed Jan 17 14:23:11 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip7.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Info request on DDRR antenna
Date: Fri, 12 Jan 1996 21:40:20 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 26
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: usr4ip7.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <[e-mail]> [e-mail].
rochester.edu (Bill VanRemmen) writes:
>From: [e-mail] (Bill VanRemmen)
>Subject: Info request on DDRR antenna
>Date: Thu, 11 Jan 96 18:54:30 GMT

>I am thinking of building a DDRR antenna for 10 meters since I live in an
>apartment with a 'no outside antenna' policy.  It looks like the 10m
>version in the ARRL Antenna Book will just about fit on TOP of the air-
>conditioner box, with some overhang.  I figure, if it doesn't look like
>an antenna from the ground, maybe no one will complain.

>Does anyone have any experience with this design?  Any idea how it performs
>versus a dipole?  Is the radiation vertical or horizontally polarized?
>Any problem with putting a 2m ring inside the 10m ring?

Bill:

The DDRR is really just a (very) short vertical with lots of top loading. Is
your A/C wall mounted or do you have roof access?  If the latter, I would sure

try something else. As to the 2M ant, I'd use a duckie on a mag mount before
doing the DDRR. The nearer you are to full size the better.

Good Luck

Wes -- N7WS



From [e-mail] Wed Jan 17 14:23:12 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!math.ohio-state.edu!uwm.edu!msunews!netnews.upenn.edu!Lehigh.EDU!Lehigh.EDU!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Info request on DDRR antenna
Date: 12 Jan 1996 07:32:24 -0500
Lines: 30
Message-ID: <4d5kco$[e-mail]>
NNTP-Posting-Host: ns5-1.cc.lehigh.edu

In article <[e-mail]>, [e-mail]
.r
ochester.edu (Bill VanRemmen) writes:
>I am thinking of building a DDRR antenna for 10 meters since I live in an
>apartment with a 'no outside antenna' policy.  It looks like the 10m
>version in the ARRL Antenna Book will just about fit on TOP of the air-
>conditioner box, with some overhang.  I figure, if it doesn't look like
>an antenna from the ground, maybe no one will complain.
>
>Does anyone have any experience with this design?  Any idea how it performs
>versus a dipole?  Is the radiation vertical or horizontally polarized?
>Any problem with putting a 2m ring inside the 10m ring?
>
>--
>
>                My opinions.  No one elses.  Get your own!
>-----------------------------------------------------------------------------
>Oh, I'm a sysadmin, and I'm ok.                | Bill VanRemmen, KA2WFJ
>I work all night and I work all day.   | [e-mail]
>I knock back Cokes, I skip my lunch,   | http://www.pas.rochester.edu/~bill
>I'm glued to the VDT!                  |
>-----------------------------------------------------------------------------
>
 I built one back in the 60's when an article concerning the design appeared
 in CQ Magazine. The 10 meter version was extremely narrow banded and as a
 result did not load worth a tinkers dam. The swr was outragous outside od a
 5kHz bandwith. I also experienced sever arcing of the capacitor every time
 the swr went nuts. Also  as a result I never made a single qso with it.
 I hope yours works better than mine did. 73's Dick K8WHA




From [e-mail] Wed Jan 17 14:23:14 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ecn.bgu.edu!newspump.wustl.edu!news.starnet.net!wupost!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: J-Pole
Date: Sat, 13 Jan 1996 15:32:56 GMT
Organization: Inlink
Lines: 21
Message-ID: <4d8jie$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: slip11.inlink.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Robert Casey) wrote:

>In article <[e-mail]> [e-mail] (Edward Lewis) wr
ites:
>>I have plans for a 2 meter j-pole constructed from 1/2 inch copper
>>pipe. I have a piece of 1 inch pipe I would like to use, if I keep all
>>deminsions the same would the antenna tune to the sams frequency as
>>the 1/2 antenna.

>Make the spacing of the two pipes (the bottom part of the J) twice as wide,
>and keep the lengths the same, should work.  Expect to do a bit of "fine
>tuning" of the location of the feedpoint to get good SWR.
If your moving from 1/2 inch all the way up to 1 inch tube, you will
have to recalculate the measurements taking into consideration the K
factor for the diameter of the pipe.  The space between the vertical
and the tuning stub remains exactly the same.

See Copper Cactus at http://www.inlink.com/~raiar

Gary KG0ZP




From [e-mail] Wed Jan 17 14:23:14 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!else.net!innuendo.tlug.org!telly!lethe!geac!onramp.ca!grumpy.insinc.net!www.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: J-Pole
Date: 11 Jan 1996 18:49:44 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 19
Message-ID: <4d3m48$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Edward Lewis ([e-mail]) wrote:
: I have plans for a 2 meter j-pole constructed from 1/2 inch copper
: pipe. I have a piece of 1 inch pipe I would like to use, if I keep all
: deminsions the same would the antenna tune to the sams frequency as
: the 1/2 antenna.

Expect that larger diameter conductors will give lower resonant
frequencies, lower impedances (for the "end fed half wave" of the J-pole),
and wider SWR bandwidths.  The transmission line part should be the
same, so you can tune it by adjusting the feedline tap point (up slightly)
and the upper section length (slightly shorter) after you build it, to get
to lowest SWR.  Constructed according to the 1/2" pipe dimensions, assuming
they were right, you'd probably find the lowest SWR down at the bottom of
the band, and you can make small adjustments to bring things in.

--
Cheers,
Tom
[e-mail]


From [e-mail] Wed Jan 17 14:23:15 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Scott Hopta )
Newsgroups: rec.radio.amateur.antenna
Subject: J-pole or Di-pole
Date: 16 Jan 1996 08:01:44 GMT
Organization: Netcom
Lines: 12
Message-ID: <4dfm18$[e-mail]>
NNTP-Posting-Host: als-il1-04.ix.netcom.com
X-NETCOM-Date: Tue Jan 16 12:01:44 AM PST 1996

He Everyone:

Which would be a better antenna to build for 2 meter and/or 440. And
also what would be the difference in performance.

Would you build a J-pole or a vertical Di-pole.

Any info would be appreciate.

Thanks

Scott Hopta


From [e-mail] Wed Jan 17 14:23:16 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!crl.dec.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Jan QST Exploring RF
Date: 12 Jan 1996 05:15:49 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <4d5ccl$[e-mail]>
References: <4cifk9$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi,
I want to get some comments from others on the January Exploring RF that
discusses an attenuator computer modeling error. Could someone else please
read the article and tell me what they "get out of it"?

I've been trying to understand the author's points for a month now, and I
fail to understand what the point was, besides he modeled the circuit
incorrectly.

73 Tom


From [e-mail] Wed Jan 17 14:23:18 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: LINEAR TUNING RODS
Date: 15 Jan 1996 10:46:14 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 34
Sender: [e-mail]
Message-ID: <4ddss6$[e-mail]>
References: <4dd4t0$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4dd4t0$[e-mail]>, John <[e-mail]> writes:

>Can anyone tell me where I can read the design parameters for linear
>tuners and the theory of operation? They seem to be increasing in use for

>multiband verticals but none of my handbooks have any dope.
>
>

Hi John,

"Linear loading" stubs can operate in two modes, one is efficient and the
other isn't.

The more efficient mode is where it acts as a decoupling stub allowing the
antenna to be used on a higher band. In that mode it generally physically
appears as a 1/4 wave shorted stub. So it allows use of a long element on
a higher frequency band by decoupling the unwanted length of the antenna.
One big advantage is a long element  can be made without any insulators,
and stll be made to work on higher bands. In these cases the stub is
usually a 1/4 wl long electrically at the decoupling frequency.

The other use is where the linear loading operates like an inductor and
makes the antenna look longer. It is not as efficient as a conventional
coil loaded antenna, but the bandwidth can be a bit better (mostly due to
the additional losses it adds). In these cases the stub length has to
calculated like a shorted transmission line to the length required to
cancel the antennas capacitive reactance. Sections on transmission lines
will give the formulas, such as in Walt Maxwell's book Reflections. But
remember, a coil is generally more efficient if you want to load a short
antenna.

Hope this helps,
Tom


From [e-mail] Wed Jan 17 14:23:19 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Log Periodic Transmission Lines
Date: 12 Jan 1996 17:05:25 GMT
Organization: Hewlett-Packard
Lines: 31
Message-ID: <4d64cl$[e-mail]>
References: <4d1lp9$[e-mail]> <4d3lk9$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4d3lk9$[e-mail]>, Tom Bruhns <[e-mail]> wrote
:
>Graeme Jury ([e-mail]) wrote:
>: Can anyone help with the formula for a transmission line made from square
>: tubing. I am using this in the construction of an LP antenna and suspect th
at
>: it will be the same as 2 parallel plate lines but the only formula I can fi
nd
>: is for round transmission line. Tnx for reading
>
>From Howard Sams' "Reference Data for Engineers", seventh edition, Pg. 29-20:
>
>"H.  Single [round] wire, square enclosure  [wire diameter = d, inside side
>length of square enclosure = D]

Yes, but what he needs is the Zo of a *square* "wire" over a ground plane.
From this, he can get Zo of a pair of square wires (twice as much).

This is known as slab line.  You might try Mattei, Young and Jones' handbook
for this one.  If not in the handbook itself, you might find some references
to IRE/IEEE Transactions that you can look up.  Also look at papers on
comb line filters made with square rods.  You can deduce Zoo and Zoe from the
coupling capacitance tables.  From that you can get Zo.

As an approximation, you might assume that the Zo of a pair of square wires
is the sames as a pair of round wires of equal surface area.  Then use
Zo = 60 ln D/d.  I'll bet that the approximation is very close for high Zo and
only deviates significantly below 150 ohms.

I wouldn't trust the parallel plate model for square "plates".

Rick Karlquist N6RK
[e-mail]



From [e-mail] Wed Jan 17 14:23:20 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!else.net!innuendo.tlug.org!telly!lethe!geac!onramp.ca!grumpy.insinc.net!www.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Log Periodic Transmission Lines
Date: 11 Jan 1996 18:41:13 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 34
Message-ID: <4d3lk9$[e-mail]>
References: <4d1lp9$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Graeme Jury ([e-mail]) wrote:
: Can anyone help with the formula for a transmission line made from square
: tubing. I am using this in the construction of an LP antenna and suspect tha
t
: it will be the same as 2 parallel plate lines but the only formula I can fin
d
: is for round transmission line. Tnx for reading

From Howard Sams' "Reference Data for Engineers", seventh edition, Pg. 29-20:

"H.  Single [round] wire, square enclosure  [wire diameter = d, inside side
length of square enclosure = D]

Zo approx=

     [138*log10(rho) + 6.48 - 2.34*A - 0.48*B - 0.12*C] * epsilon^0.5

where
     rho = D/d

     A = ( 1 + 0.405*rho^-4 ) / ( 1 - 0.405*rho^-4 )

     B = ( 1 + 0.163*rho^-8 ) / ( 1 - 0.163*rho^-8 )

     C = ( 1 + 0.067*rho^-12 ) / ( 1 - 0.067*rho^-12 )

     epsilon = relative dielectric constant of the dielectric  "
             = 1 for air dielectric

(Hopefully I haven't made too many [any] typos transcribing this...)


--
Cheers,
Tom
[e-mail]


From [e-mail] Wed Jan 17 14:23:21 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet
Newsgroups: rec.radio.amateur.antenna
Subject: Looking for SG-230 or similar
Message-ID: <[e-mail]>
From: Bill Harwood <[e-mail]>
Date: Tue, 16 Jan 1996 20:31:07 GMT
Sender: [e-mail] (NAWS news admin)
Organization: NAWS, China Lake, CA
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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Lines: 14

I need to find an SGC-230 feed point tuner.  Would prefer a later
moidel.  I would also consider another manufacturers equivelent tuner.

Please reply by e_mail or phone at [phone]

Thanks

  \------------------------------------------------------/
   \  Bill Harwood           U play it, I'll dance it   /
    \ AB6DY                         or                 /
     \                      I'll play it, U dance it  /
      \----------------------------------------------/




From [e-mail] Wed Jan 17 14:23:21 1996
Path: news.epix.net!news.sprintlink.net!crusher.ici.net!tsmith
From: [e-mail] (Tim Smith)
Newsgroups: rec.radio.amateur.antenna
Subject: MFJ SWR Analyzers - Any users?
Date: Sun, 14 Jan 96 16:26:54 GMT
Organization: From the home front
Lines: 15
Message-ID: <4dbe97$[e-mail]>
NNTP-Posting-Host: dialups153
X-Newsreader: News Xpress Version 1.0 Beta #4

I'm thinking about buying one...any pros/con?  Does your have the internal
resistance (aka impedance) bridge?  Is the built in counter worth it?  Any
success/horror stories in antenna building using these?  Better than or does
it compliment a dip meter?  Are the wide range ones (1.8-170MHz)vernier tuned
and stable enough for handheld operation?

Thanks,

N1BTQ

Tim Smith

Email: [e-mail]
WWW: http://www.ici.net/cust_pages/tsmith/tsmith.html
Fax: [phone]


From [e-mail] Wed Jan 17 14:23:22 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in1.uu.net!news1.digex.net!news.crosslink.net!usenet
From: [e-mail] (Chester Alderman)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: MFJ SWR Analyzers - Any users?
Date: 15 Jan 1996 12:49:10 GMT
Organization: CrossLink Internet Services
Lines: 34
Message-ID: <4ddig6$[e-mail]>
NNTP-Posting-Host: dyn015a.springfield.va.us.crosslink.net
X-Newsreader: NeoLogic News for OS/2 [version: 4.2]

In message <4dbe97$[e-mail]> - [e-mail] (Tim Smith) writes:
:>
:>I'm thinking about buying one...any pros/con?  Does your have the internal
:>resistance (aka impedance) bridge?  Is the built in counter worth it?  Any
:>success/horror stories in antenna building using these?  Better than or does

:>it compliment a dip meter?  Are the wide range ones (1.8-170MHz)vernier tune
d
:>and stable enough for handheld operation?
:>
:>Thanks,
:>
:>N1BTQ
:>
:>Tim Smith
:>
:
        Tim...I've been using the older MFJ-247 for several years now and have found
it to be a pretty useful piece of gear. This one has the internal 1-40 MHz
sig gen and counter, and it can be battery operated. It is very convenient to
carry that out to the antennas rather than the older way's of checking SWR.
While the engineering lab accuracy certainly is not there, it certainly is
close enough for ham use.

        The only thing I think is better is probably the AEA SWR analyzer with its
graphic LCD readout, and of course it is battery operated also. I do think as
soon as I can save up the 'nickles' I'm going to get the AEA unit.

        All-in-all, I've found the MFJ unit to be satisfactory.

Tom/W4BQF



[e-mail]



From [e-mail] Wed Jan 17 14:23:24 1996
Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!netnews
From: [e-mail](Ted Viens)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: MFJ SWR Analyzers - Any users?
Date: 15 Jan 1996 14:04:43 GMT
Organization: Netcom
Lines: 33
Message-ID: <4ddmtr$[e-mail]>
References: <4dbe97$[e-mail]>
NNTP-Posting-Host: ix-hou6-05.ix.netcom.com
X-NETCOM-Date: Mon Jan 15  6:04:43 AM PST 1996

In <4dbe97$[e-mail]> [e-mail] (Tim Smith) writes:
>
>I'm thinking about buying one...any pros/con?  Does your have the internal
>resistance (aka impedance) bridge?  Is the built in counter worth it?  Any
>success/horror stories in antenna building using these?  Better than or does

>it compliment a dip meter?  Are the wide range ones (1.8-170MHz)vernier
tuned
>and stable enough for handheld operation?
>
>Thanks,
>
>N1BTQ
>
>Tim Smith
>
>Email: [e-mail]
>WWW: http://www.ici.net/cust_pages/tsmith/tsmith.html
>Fax: [phone]

I bought the MFJ-259 last year with the grid dip coils.  I am currently using
it to check out the results of a home built Lindenblad antenna to be
used for weather sat reception.  I am happy with it.  The frequency
counter is an Optronics OP-10 module and can be used separately through
a second connector. The meters are adequate for monitoring dips and
impedance swings.  My only complaint is the poor linearity in the
frequency adjust knob.  I am sure they could have specified a more
appropriate taper or at least added a small resistor or two to modify
the taper of the multiturn pots they are using.  Still, I am happy with
it.
--
Bye...  Ted..
Deep in the Heart of the Armpits of Houston, Texas...


From [e-mail] Wed Jan 17 14:23:25 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger
From: [e-mail] (COUGER GORDON)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: MFJ SWR Analyzers - Any users?
Date: 15 Jan 1996 14:41:08 GMT
Organization: CEAT at Oklahoma State University, Stillwater
Lines: 35
Message-ID: <4ddp24$[e-mail]>
References: <4ddig6$[e-mail]>
Reply-To: Gordon Couger <[e-mail]>
NNTP-Posting-Host: master.ceat.okstate.edu

>In message <4dbe97$[e-mail]> - [e-mail] (Tim Smith) writes:
>:>
>:>I'm thinking about buying one...any pros/con?  Does your have the internal
>:>resistance (aka impedance) bridge?  Is the built in counter worth it?  Any
>:>success/horror stories in antenna building using these?  Better than or doe
s
>:>it compliment a dip meter?  Are the wide range ones (1.8-170MHz)vernier tun
ed
>:>and stable enough for handheld operation?
>:>
>:>Tim Smith
>
I have an MFJ with frequency readout and internal resistance meter. I find it
a very useful tool. It will handle 90% of my needs. It is not as frequency
stable as I would like it to be but it is good enough for antenna work. I also
use it as a signal generator on occasion.

I have a Booton Impeadence bridge and a noise birdge also. I nearly allways
use the MFJ because it is eaiser to use and will almost always do what I need.

The only real problem with this type of meter is it can be over loaded by a
strong recived signal. But this is also true of the Booton. Another problem
I have encountered with it is if there is some crud in the connections of an
antenna you may need to load it with some power to establish a good enough
connection for it to work. This would be true of any other low power method of
antenna measurement.

I like the unit very much and I would buy another one.

Your milage my vary
Gordon AB5DG


   Gordon Couger
   Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075
   [e-mail] 405 744 8392 day 625-2855 evenings



From [e-mail] Wed Jan 17 14:23:26 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!news.tacom.army.mil!ulowell.uml.edu!wang!news.kei.com!newsfeed.internetmci.com!uwm.edu!homer.alpha.net!Shea
From: [e-mail] (Kevin Shea)
Newsgroups: rec.radio.amateur.antenna
Subject: Mods for Yaesu  G 5400 az/el rotator
Date: Sun, 14 Jan 96 02:42:31 GMT
Organization: N9JKP
Lines: 20
Message-ID: <4d9qk9$[e-mail]>
NNTP-Posting-Host: 205.213.64.118
X-Newsreader: News Xpress Version 1.0 Beta #4

In another newsgroup someone metioned that there was a mod for the 5400.
It was suggested to look for info on a tracking system called "supertrack"
developed by Freddy de Guchteneire, ON6UG.  The mods apparently replace the 10

turn pots with optical encoders in order to improve the pointing accuracy of
the 5400.

I've looked all over and have found nothing e.g. oak.oakland.edu's FTP site.

Any help would be greatly appreciated!

73,

Kevin N9JKP

****************************************
* Kevin G. Shea  N9JKP                 *
* 4460 Dahmen Pass                     *
* Cross Plains, WI 53528 USA           *
* 608.789.4326,voice; 608.798.1747,fax *
****************************************


From [e-mail] Wed Jan 17 14:23:27 1996
Path: news.epix.net!news.sprintlink.net!eskimo!news.pixi.com!usenet
From: Pat & Adaire Mason <[e-mail]>
Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna
Subject: MW antennas, capacitors, DFing etc...
Date: Sat, 13 Jan 1996 11:45:53 -1000
Organization: Pacific Information eXchange, Inc.
Lines: 71
Message-ID: <[e-mail]>
References: <4d3or0$[e-mail]> <[e-mail]>
NNTP-Posting-Host: rodan08.pixi.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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Xref: news.epix.net rec.radio.shortwave:68822 rec.radio.amateur.antenna:18438

Ron Hardin <9289-11216> 0112110 wrote:
>
> I use a home-made MW loop antenna that is very successful in pulling
> signals out of the noise.  It extends Imus in the Morning for about an
> hour, listening in Ohio to WFAN 660 NYC
>
> It costs about $10 to build; I'm not sure what the commercial MW loops
> are or how much they cost.
>
> It's not too useful at night, when signal strength isn't lacking,
> but is wonderful in the day, for getting an extra couple hundred miles
> or so of reception.
>
> (It's an 18.75 inch side wooden square (18" plus .75 inch thickness of
> the next board), with 14 turns of Radio Shack 22awg hookup wire
> wound on it, separating the turns as much as possible on the 2.5"
> board width.   The ends of the wire are connected to the leads
> of the capacitor mounted in an unassembled Radio Shack crystal set kit.
> The arrangement tunes from 600kHz to 1660kHz.  You put the radio
> inside the loop, not connecting it to anything, and it works like
> a charm.
>
> The Radio Shack capacitor is noisy and has intermittent connections,
> so if you can get a real broadcast capacitor it would be better.
> But the crystal set kit is easy to get and regular variable
> capacitors are not.
>
> Most things attach nicely with duct tape.
>
> I have tried various sizes of loop and find the 18" baby works
> as well as bigger ones with my SRIII and 7600G, and is much
> handier.
>
> To raise the whole frequency range, eliminate turns of the wire;
> to lower the whole frequency range, add turns.  A larger loop
> requires fewer turns.)

Yes, this design is excellent and uses inductive coupling to the
set's internal ferrite rod.  Thus I imagine it will not work with
those comm. receivers with no internal antenna, such as the Drake
R8; yet I use a 12" homemade loop and inductively couple it to an
AOR Active ferrite loop antenna and it works well.  The flatter
you get the loop (narrow turns, larger circumference, like a
pancake) the better it will be for direction finding, which is
very useful in determining where stations are.

This loop is the same design of the Select-a-Tenna, which runs
for about $70 or so.  The active Kiwa (a future purchase of mine)
is $350 + shipping.  Kiwa is on the net and has a nice description
of the loop and other products, and pictures.

Now my question, does anyone know a good place to order broadcast
capacitors -- that cover up to 1700 kHz?  I don't think there is
any good store in Hawai'i that actually has them.  I used to get
mine from Electronics Plus in Beltsville, MD when I used to live
in the Washington "snow haven" area.

Also, as far as DFing goes, I have been looking for a great-circle
map centered on Honolulu; if anyone has one that they don't need
anymore, please let me know at [e-mail].  Also, I found
a couple of great circle computation programs on the net which
are good use in DF computation -- next post I will give the site
when I find out what it is, that is if there is an interest.  I
forgot the site but will look for it again.

Patrick Mason
National Radio Club member
Mililani, Hawai'i
[e-mail]

TP DX nightly...


From [e-mail] Wed Jan 17 14:23:29 1996
Path: news.epix.net!news.sprintlink.net!gryphon.phoenix.net!usenet
From: "Bill Holbert Sr." <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Need help for ( Cushcraft ARX-2B )
Date: 13 Jan 1996 22:55:43 GMT
Lines: 15
Message-ID: <4d9d9f$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: realbill.breh.phoenix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

Tony my name is Bill and amateur call is W5BBR located in Brenham, TX.
If you will tell me the frequency which you wish to operate the ARX-2B I
will provide the correct dimensions for setting up the antenna.  There
will be three dimensions:  First will be from the top of the insulator
that the Hairpin mounts into, then from the top of insulation from the
mount to the mast to the radiator insulator to the bottom of the
insulator which the hairpin mounts into, and then finally the dimension
of the hairpin to center of the radiator.

You can provide answer by E-Mail or place a post here either way.

Regards.

Bill, W5BBR



From [e-mail] Wed Jan 17 14:23:30 1996
Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!news.tcst.com!op.net!uaem!news.uoregon.edu!cs.uoregon.edu!usenet.ee.pdx.edu!newsrelay.netins.net!news.netins.net!news.dacom.co.kr!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!usc!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Need UHF DF ideas
Date: 10 Jan 1996 01:45:08 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 28
Message-ID: <4cv5n4$[e-mail]>
References: <4cp9m8$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com

Gordon Mitchell ([e-mail]) wrote:
: I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and
: Adcock array with a doppler scheme for DF.

My understanding is that an Adcock antenna uses time-difference-of-arrival
at pairs of antennas (with a two orthogonal crossed pairs) to find
direction; this is different than a Doppler.

: It would be ideal to find one that is hand-held, compact, and doesn't
: take much power.  Generally it will be used in the 130-900 MHz range.

I long ago built the unit described in May, 1978, QST, a Doppler system.
I built it originally for 2 meters, but now have an antenna for 440 as
well.  The deviation varies directly with diameter of the array and with
frequency, so for optimal deviation, you are limited to a modest range
of frequencies with a single antenna unit, unless you want to optimize your
receiver instead.  And to get really good antenna switching over a broad
range of frequencies will require a lot of care; my antennas are optimized
for specific bands.

On the plus side, the 440 antenna is small and easily hand-carried.  I've
put a receiver in the electronics box, with 8 AA penlight cells, and they
last several hours of on-time.

--
Cheers,
Tom
[e-mail]


From [e-mail] Wed Jan 17 14:23:31 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.av.qnet.com!news.qnet.com!news.widomaker.com!grouper.Exis.Net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!warwick!news.herts.ac.uk!news.herts.ac.uk!not-for-mail
From: [e-mail] (Lauder)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Need UHF DF ideas
Followup-To: rec.radio.amateur.antenna
Date: 12 Jan 1996 16:54:39 -0000
Organization: University of Hertfordshire
Lines: 20
Sender: Dave Lauder
Message-ID: <4d63of$[e-mail]>
References: <4cp9m8$[e-mail]>
NNTP-Posting-Host: altair.herts.ac.uk

In article <4cp9m8$[e-mail]> [e-mail]
(Gordon Mitchell) writes:

>I'd like to build (or buy) a UHF DF setup, e.g., the sort that uses and
>Adcock array with a doppler scheme for DF.
>
>It would be ideal to find one that is hand-held, compact, and doesn't
>take much power.  Generally it will be used in the 130-900 MHz range.
>
>   Gordon Mitchell   K7HCV  [e-mail]
>   Future Focus, Inc  [phone]
>   Electronic eavesdropping countermeasures

For anyone interested in DF, I recommend the book "Transmitter Hunting,
Radio Direction Finding Simplified" published by Tab in the USA in 1987.
It covers just about every known type of DF technique and gives
construction details and practical DF hints.  I think you can buy a copy
from ARRL.  I got mine from Radio Society of Great Britain recently.

Dave Lauder, g0sno  [e-mail]


From [e-mail] Wed Jan 17 14:23:32 1996
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Noise rejection
Date: 9 Jan 1996 05:38:48 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 29
Sender: [e-mail]
Message-ID: <4ctgjo$[e-mail]>
References: <4cr13l$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4cr13l$[e-mail]>,
[e-mail] (Wolfgang Gellerich) writes:

>Try a magnetic loop. Most of the man made noise constists purely or
mainly
>of an electric component, while a megnetic loop will only receive the
>magnetic component of an electromagnetic field. The ARRL Antenna Book and
the
>Antenna Book by K. Rothammel give detailled descriptions of this kind of
>antenna.
>
>73s, Wolfgang DJ3TZ

Hi Wolfgang,

Handbooks present the wrong idea on this. Noise is NOT of a dominate
electrical field just "because it comes from electrical appliances and
devices". It is just as likely to be magnetic field dominate. If it is far
field (or even approaches far field) the magnetic and electrical field
levels are equal. For a small antenna both electrical and magnetic fields
are nearly equal much closer than a 1/2 wavelength!

It doe not matter the noise starts from a spark, a bolt of lightning, or
from a CW oscillator. Noise is an electromagnetic wave exactly like a
radio wave. "Shielding the loop" can do nothing to help unless the system
is very poorly designed or located.

73,
Tom


From [e-mail] Wed Jan 17 14:23:33 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!howland.reston.ans.net!agate!holonet!colossus.holonet.net!cencore!forrest.gehrke
From: [e-mail] (FORREST GEHRKE)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Off-center fed dipol
Message-ID: <[e-mail]>
Date: Fri, 12 Jan 96 11:11:00 -0300
Distribution: world
Organization: Central Core BBS, 201-575-8991
Reply-To: [e-mail] (FORREST GEHRKE)
References: <4csmst$[e-mail]>
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 30

CM> Hi Forrest, I guess I was fortunate. My Elmer was Shorty, W5OLV (SK)
CM> and he was the local Madison Co., TX radio/TV repairman. He loaned
CM> out his VTVM and grid dip meter to all the local hams. But, as you
CM> say, one can make do with a pickup loop with a neon or other kind of
CM> bulb.

You definitely were lucky.  The VTVM and the grid dip meter really
did not become fairly common until the 1950's.  That's about
the time I bought an RCA Voltohmyst and the Lafayette Grid Dip
meter (the latter made in Japan!).

CM> >"The most dangerous persons and groups in our society >are those
CM> who do not know that they do not know".

Upon re-reading my post, that quote could have been read as applying
to you, which I did not mean at all. I threw it in only because it
is so true so often.  As you may know, George Brown went on into
television at RCA. He came up with vestigial sideband transmission
and was instrumental in devising the present all-electronic color
TV broadcast standard which avoided obsoleting B&W receivers when
color was being broadcast.  His comment was directed at the FCC
for approving a kludge CBS color system standard involving a
mechanical whirling color filter! (Much like the Jenkins TV
scanner wheel of the early 1930's). The industry considered that
approval so ridiculous that nobody adopted it or attempted to build
TV receivers for it except CBS.  It never went anywhere except
in FCC demos.  I saw one of those receivers--you can imagine
the noise from that filter!

 * RM 1.3 02583 * If it ain't broke yet, let me have a shot at it....


From [e-mail] Wed Jan 17 14:23:34 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!ifwtech.demon.co.uk!G3SEK
From: Ian White <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: Mon, 15 Jan 1996 07:15:05 +0000
Organization: IFW Technical Services
Lines: 29
Distribution: world
Message-ID: <$[e-mail]>
References: <4b9jgi$[e-mail]>
 <4bc3e4$[e-mail]> <4ceesi$[e-mail]>
 <[e-mail]>
 <4dbqne$[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
X-NNTP-Posting-Host: ifwtech.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL>

In article <4dbqne$[e-mail]>, Jim Weir wrote:
>> Are you saying that a material that passes the oven test
>>might still be unsuitable for use at HF?
>
>Absopositistinkingtruly.  Take a plain old aluminum pie pan
[snip]

OK, I'll give you that one, Jim!  :-)

Now,
                       an INSULATING
>> Are you saying that ^ material that passes the oven test
>>might still be unsuitable for use at HF?

By "passes the oven test", I mean "gets little or no warmer than the
surrounding air, in the time it takes to boil a glass of water".


>Tell me if you also didn't get my email on a slightly different
>subject.

(Sorry, nothing arrived here.)


73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - anywhere.


From [e-mail] Wed Jan 17 14:23:35 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
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From: [e-mail] (Gary Coffman)
Subject: Re: Re: QST Tuner Article
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]>
Date: Fri, 12 Jan 1996 18:21:22 GMT
Lines: 32
Xref: news.epix.net rec.radio.amateur.homebrew:12665 rec.radio.amateur.antenna:18398

In article <[e-mail]> [e-mail] (
Doug Faunt N6TQS [phone]) writes:
>Does the copyleft protect the authors from someone else using the code
>in a commercial product, or just specify that all changes, as well as
>the original source must be made available?

The latter. It also prohibits charging for the code, though a media
and distribution charge is allowed. Thus someone can't take your program
and go sell it, but they can charge a media and distribution fee to *give*
it away.

Copyleft is a powerful idea, born of concepts of academic freedom.
It encourages development by allowing access to the work of others
so you don't have to constantly be reinventing the wheel, but can
stand on the shoulders of giants while making your contribution.
It also, due to the mandatory source availability, is a powerful
teaching tool. It allows anyone to see how things work, and how
a particular problem might be addressed by a practitioner in the
field.

This latter is particularly important to an organization like the
ARRL which maintains its tax exempt status by claiming to be an
educational organization. If they wish to teach us about *auto*
tuners, then they'd better show us how the *auto* part works. Trade
secrets have no place in a tax exempt educational organization's
lead publication.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Wed Jan 17 14:23:37 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: QST Tuner Article
Date: 17 Jan 1996 02:37:52 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 43
Message-ID: <4dhne0$[e-mail]>
References: <4dg7m9$[e-mail]>
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>   [e-mail] (Thilo Kootz) writes:
>  Dave Nulton <[e-mail]> wrote:
>
>
>  >The focus of my project at this point is writing a program to draw
>  >a smith chart and plot impeadance points as I run my algorithym.
>  >The smith chart is a handy way of looking at impeadance data -
>  >although it has slowed me down quite a bit.  I have already
>  >written the functions needed to model different algorithyms - just
>  >need to write the algorithyms.
>
>  >I am also looking for a schematic for a "phase / mag" detector -
>  >to use instead of the directional voltmeter (or
>  >what-chu-ma-call-it) used in the QST project.  That way the
>  >program could predict the best match instead of clattering relays
>  >looking for a match.
>
>  Hi Dave !
>  As I understand you effort, you want to measure the komplex impedance
>  of your antenna at a give frequency (i.e. 60-j80), insert the data in
>  your computer and than it tells you how to adjust your tuner.
>  If i understood correctly (please tell if i did not), that should be
>  fairly easy. i wrote a procedure that gives you all solutions of
>  c1,l,c2  for a t-filter configuration to match a certain impedance to
>  50ohms. that is a long list. now you simply take the solution which
>  has the highest load capacity (c2=max). This should be the best match
>  with least loss !
>  I think the hard part to it is guessing the complex impedance !!!
>  If you have suggestions, how that could be accomlished, i would be
>  thankfull to hear.
>  73 thilo dl9kce
>
> ***************************
Use one of the antenna modeling programs to get an idea of what your antenna l
ooks like
and then get a copy of "TL.zip" a program - transmissions line - from ARRL tha
t will do
exactly what you are talking about.  It will give you component data for T - P
i and L
configurations.

73/Jim/AC4cz
>
>
>>>>



From [e-mail] Wed Jan 17 14:23:38 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: R7 & DX77
Date: 15 Jan 1996 17:32:17 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 14
Message-ID: <4de331$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>I'm going to buy a HF vertical antenna and I'd like to know your
>opinions or experiences about these antennas:
>R7 by Cushcraft and DX77 by Hy Gain.
>Tnx a lot.

Well,

I feel sorry for you. These no-radial verticals are really poor antennas
and are easily outperformed by the simplest wire dipole. The advertizment
claims of high efficiency are a downright lie.

73, Moritz Dl5UH




From [e-mail] Wed Jan 17 14:23:39 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Radiation Resistance of end-feed, unbalanced antennas
Date: 12 Jan 1996 10:09:50 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Hi David,
In article <4d59mk$[e-mail]>, [e-mail] (DavidSt1)
writes:

>Tell me if I have this right:
>Given an end-fed wire tuned to resonance with a series L/C
>tuner, the radiation resistance is a function of the effective
>height of the wire above it's ground plane.

Radiation resistance is often a carelessly or mis-used term. In the most
useful case, it is the total power radiated divided by the square of the
net current causing the radiation. If that definition is used, it is a
measure of how "easily" the antenna radiates. Your example fits that
definition.

The other "definition" is feedpoint resistance due to radiation and other
losses. It isn't very useful except in very limited applications.

>I'm thinking of aircraft HF antennas here.  Given the antenna is
>tuned to resonance, the wire's effective height above "ground"
>(the aircraft body) is small so the radiation resistance is,
>at best, a few ohms.  So, given that X is tuned out, that leaves
>radiation resistance plus ohmonic resistances.  Is this correct?

Yes, but that isn't necessarily the value measured at the feed terminals.
Look at the case of a vertical 1/2 wave end fed. The radiation resistance
may be 80-100 ohms at certain heights above a large groundplane, but the
feedpoint impedance (as "seen" at the end) can be anywhere from a few
hundred to few thousand ohms (depending largely on element thickness).

73 Tom
>Thanks,
>D. Stinson
>
>
>



From [e-mail] Wed Jan 17 14:23:40 1996
Path: news.epix.net!news.sprintlink.net!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Radiation Resistance of end-feed, unbalanced antennas
Date: 12 Jan 1996 19:59:09 GMT
Organization: ELNEC/EZNEC Software
Lines: 33
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References: <4d59mk$[e-mail]>
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>   [e-mail] (DavidSt1) writes:
>  Tell me if I have this right:
>  Given an end-fed wire tuned to resonance with a series L/C
>  tuner, the radiation resistance is a function of the effective
>  height of the wire above it's ground plane.
>
>  I'm thinking of aircraft HF antennas here.  Given the antenna is
>  tuned to resonance, the wire's effective height above "ground"
>  (the aircraft body) is small so the radiation resistance is,
>  at best, a few ohms.  So, given that X is tuned out, that leaves
>  radiation resistance plus ohmonic resistances.  Is this correct?
>  Thanks,
>  D. Stinson

The value of the feedpoint resistance depends highly on the lengths
of the antenna and aircraft. I recommend forgetting about "ground"
and consider the antenna to be made of two "wires" -- one is the
actual wire and the other is the aircraft. The antenna is fed at
the junction of the two "wires". Any change to either the aircraft
or the actual wire will modify the characteristics of the antenna.
Think of it as a dipole with unequal length, unequal diameter legs.

Some people will argue that "radiation resistance" should be
measured at a current loop. If you use that definition, the
radiation resistance may be different from the feedpoint resistance,
even if the actual wire is shorter than 1/4 wavelength, because a
current loop will occur on the aircraft if it's electrically long
enough.

Roy Lewallen, W7EL





From [e-mail] Wed Jan 17 14:23:41 1996
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From: [e-mail] (Adam Husik)
Newsgroups: rec.radio.amateur.antenna
Subject: Repeater Antennas
Date: Sun, 14 Jan 1996 01:02:17 GMT
Organization: New Jersey Computer Connection, Lawrenceville, NJ
Lines: 17
Message-ID: <4d9d67$[e-mail]>
NNTP-Posting-Host: husik.njcc.com
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We are currently in the planning stage of setting up a VHF repeater
with approximately 30-50 watts. The location will be on the top of a
house which is approximately at 300'. The house is located on one of
the highest points in Princeton NJ, Great Rd. There are  trees in the
area, however, I'm not sure how relevant that is due to the fact that
we are using VHF. My question is: is there a way to calculate the
usable range of this repeater system, given that we use a directional
or omnidirection antenna. We don't know a lot about antennas but want
to get the maximum range possible with the least power.

Any suggestions?

Adam Husik
KB2UTP




From [e-mail] Wed Jan 17 14:23:42 1996
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From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: RFI from ladderline?
Date: 12 Jan 1996 03:39:12 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 40
Distribution: world
Message-ID: <4d4l50$[e-mail]>
References: <4d1c51$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In article <4d1c51$[e-mail]>,
 <[e-mail]> wrote:
>I'm thinking of going to a ladder-line-fed dipole instead of my
>coax-fed trap dipole to cut my losses in the coax from the
>high SWRs of nonresonant antenna.

Hi Bill, my 102 ft dipole fed with ladder-line radiates well
on all bands because I kill the reflections before they
reach my balun and tuner or amp. I just checked into a 75m
net in CA from AZ. Net control said he couldn't give me an
accurate 'S' meter reading because it only went up to 40dB
over S9. I previously lost a lot of my 100w in the tuner and
balun. I'm now getting most of my 600w to the antenna.

>I think I might get more rf to the radiator using ladder line.

There won't be much difference on bands where the SWR is low.
There could be considerable difference on bands where the SWR
is high. But to be fair, there's not much difference between
the losses in 9913 and 300 ohm TV twin-lead.

>A fellow ham advised me against using ladder line, saying it
>produces a lot of RFI.  Is this true?

It's a myth that needs to be debunked. Coax with unbalanced
currents will radiate much more potential RFI than ladder-line
with balanced currents because the equal/opposite currents cancel
the fields surrounding the ladder-line.

>If so, would a current
>balun at the feedpoint eliminate this alleged RFI?

Ideally, anytime the transmission system changes from balanced
to unbalanced or visa versa, a balun should be installed to
help balance the currents. One will generally get more
feedline radiation from feeding a balanced antenna directly
with coax than from feeding the same antenna directly with
ladder-line and a balun at the coax/ladder-line interface.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Wed Jan 17 14:23:44 1996
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From: [e-mail] (David Lipson)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: RFI from ladderline?
Date: 12 Jan 1996 22:03:36 GMT
Organization: Medtronic Corporation
Lines: 19
Message-ID: <4d6lro$[e-mail]>
References: <4d1c51$[e-mail]>
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X-Newsreader: WinVN 0.90.5

In article <4d1c51$[e-mail]>, [e-mail] says:
>
>I'm thinking of going to a ladder-line-fed dipole instead of my
>coax-fed trap dipole to cut my losses in the coax from the
>high SWRs of nonresonant antenna.  While I have no problems using
>the trap dipole, being able to tune it EVERYWHERE, including 160m,
>I think I might get more rf to the radiator using ladder line.
>A fellow ham advised me against using ladder line, saying it
>produces a lot of RFI.  Is this true?  If so, would a current
>balun at the feedpoint eliminate this alleged RFI?  I'm using a
>50' run of RG8U coax to the trap dipole, by the way, which I'm
>wondering might be just fine, and that I might be making
>unnecessary work for myself, and that the losses now might not
>be as bad as I might think.  Thanks for your collective wisdom.
>--Bill KB8USZ [e-mail]

If you have unbalanced currents in either co-ax or ladder, you'll get TVI.

de N9PVF


From [e-mail] Wed Jan 17 14:23:45 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: RFI from ladderline?
Date: Sat, 13 Jan 1996 06:57:25 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 64
Message-ID: <4d7l70$[e-mail]>
References: <4d1c51$[e-mail]>
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[e-mail] wrote:

>I'm thinking of going to a ladder-line-fed dipole instead of my
>coax-fed trap dipole to cut my losses in the coax from the
>high SWRs of nonresonant antenna.  While I have no problems using
>the trap dipole, being able to tune it EVERYWHERE, including 160m,
>I think I might get more rf to the radiator using ladder line.
>A fellow ham advised me against using ladder line, saying it
>produces a lot of RFI.  Is this true?  If so, would a current
>balun at the feedpoint eliminate this alleged RFI?  I'm using a
>50' run of RG8U coax to the trap dipole, by the way, which I'm
>wondering might be just fine, and that I might be making
>unnecessary work for myself, and that the losses now might not
>be as bad as I might think.  Thanks for your collective wisdom.
>--Bill KB8USZ [e-mail]

Bill,

Please don't do this without careful analysis.

A properly made trapped dipole is not the terrible lossy
monster it is made out to be. Even at the band edge on 160M,
the SWR should be moderate enough to be handled in an
efficient manner with a antenna tuner in the shack. The
extra loss in your coax due to SWR should be negligible.

The ladder-line fed dipole (LLFD) on the other hand can be
MORE lossy when the true loss of ladder-line is used,
particularly in the case cited by WB6LWS.
All of this has been discussed here in recent months, but in
a nut shell.

The published loss figures for are highly optimistic,
especially when the line is wet.

I have computed losses of from 7 to 12 dB, depending on
whether you include the complex line impedance in the
calculations, for an 80 meter dipole fed with 100' of 450
ohm line on 160 meters. This assumes dry line, with no
accounting for bends, unbalance, etc. A 1/4 wavelength
antenna is NOT a good length. Going to 3/8 makes a large
difference in efficiency.

In addition to line loss, you must add tuner and balun
losses which can be much higher than are normally assumed,
particularly when the SWR is >100.

The idea that RFI is produced by the transmission line,
except in cases of poor connections, etc, is nonsense.
There MAY be more line radiation from parallel conductor
line, but to say this is a cause of RFI is spurious (no pun
intended).  If another device is being affected by your
transmissions, then either your transmitter is generating
spurious signals or the affected device is susceptible to
overload.  Radiation from the line may be increasing the
signal at the affected device, but to say the line is
"producing" RFI is wrong.  You could do the same thing with
a "perfect" transmission line and an antenna located closer
to the overloading device or by increasing transmitter
power.

73, Wes -- N7WS




From [e-mail] Wed Jan 17 14:23:46 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: RFI from ladderline?
Date: 10 Jan 1996 21:47:13 GMT
Organization: Oberlin College, Oberlin, Ohio
Lines: 13
Message-ID: <4d1c51$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: alpha.cc.oberlin.edu

I'm thinking of going to a ladder-line-fed dipole instead of my
coax-fed trap dipole to cut my losses in the coax from the
high SWRs of nonresonant antenna.  While I have no problems using
the trap dipole, being able to tune it EVERYWHERE, including 160m,
I think I might get more rf to the radiator using ladder line.
A fellow ham advised me against using ladder line, saying it
produces a lot of RFI.  Is this true?  If so, would a current
balun at the feedpoint eliminate this alleged RFI?  I'm using a
50' run of RG8U coax to the trap dipole, by the way, which I'm
wondering might be just fine, and that I might be making
unnecessary work for myself, and that the losses now might not
be as bad as I might think.  Thanks for your collective wisdom.
--Bill KB8USZ [e-mail]


From [e-mail] Wed Jan 17 14:23:47 1996
Path: news.epix.net!news.sprintlink.net!ns2.pb.net!news
From: bob maickel <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: RFI from ladderline?
Date: 13 Jan 1996 02:31:41 GMT
Organization: Long Island Internet HQ/Point Blank BBS LTD.
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I've used multi-band ladder line antennas for many years. However, the
antenna has to be designed to work with ladder line. I don't think it
wise to substitute ladder line for coax in your situation. Ladder line
does not cause RFI when used with an antenna designed for ladder line.
A balun arrangement would probably complicate the problem.

AR 73
de Bob WB2ZHA




From [e-mail] Wed Jan 17 14:23:48 1996
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From: [e-mail] (Chester Alderman)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: RFI from ladderline?
Date: 14 Jan 1996 01:05:35 GMT
Organization: CrossLink Internet Services
Lines: 38
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References: <4d1c51$[e-mail]>
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In message <4d4l50$[e-mail]> - [e-mail] (Cecil

A. Moore~) writes:
:>
:>In article <4d1c51$[e-mail]>,
:> <[e-mail]> wrote:
:>>I'm thinking of going to a ladder-line-fed dipole instead of my
:>>coax-fed trap dipole to cut my losses in the coax from the
:>>high SWRs of nonresonant antenna.
:>

Thanks for asking tha question about trap dipoles and feedline. Some of the
responses certainly shows that ham's THINK they know transmission lines.

True...if your feedline is only 50 feet long, your probably not going to gain
anything by switching to ladder line.

Of spaced transmission line, the so-called 'ladder-line' is the worst choice.
PVC covered 'ladder-line' has about the same loss per 100' at 21 MHz as coax
does.

The currents in ladder-line or open wire feeders are ONLY equal and balanced
if each side of the dipole are EXACTLY equal in length. ANY equal sided
dipole has maximum voltage (minimum current) at the end of each dipole wire.

What a wasted (LOSS) to use a balun in a tuner that is connected to open wire
feeders. If you go to the trouble to build open wire feeders, also go to the
trouble to build/buy a balanced antenna tuner...such as the old E.F. Johnson
Match Box type tuners.

Don't ever buy the story of someone being 'more than 40 db over' because they
use ladder-line or open wire feeders...the next time the propagation skip is
substantially different between those two locations, that same station MAY
NOT EVEN BE HEARD!

Tom...W4BQF

[e-mail]



From [e-mail] Wed Jan 17 14:23:49 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!micro.internexus.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!iglou!iglou.com!n4lq
From: [e-mail] (Steve Ellington)
Subject: Re: RFI from ladderline?
X-Nntp-Posting-Host: iglou
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Date: Fri, 12 Jan 1996 13:00:51 GMT
Lines: 14

These guys are talking about feeding a wire antenna without traps. You
are feeding a trap dipole which I assume was designed to operate on
several bands. Using open wire line would not be advisable since with
coax you have a resonable match already. 50feet of anything isn't going
to cause much power loss at HF frequencies! Stick with the coax. It will
be much easier to match. Plus, if you go to open line, you will need a
balun at the tuner which will introduce more loss than you would ever
overcome by changing feeders. If you are really concerned about a little
loss, switch to a higher grade of coax.



--
Steve Ellington [e-mail]  Louisville, Ky


From [e-mail] Wed Jan 17 14:23:50 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: SB-201 SWR
Date: 12 Jan 1996 11:30:37 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 77
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Message-ID: <4d62bd$[e-mail]>
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Hi Jim,

In article <4d5q24$[e-mail]>, jaeschke
<[e-mail]> writes:

>Another way of looking at the power transfer that I thought
>Gary was refering to, is as follows.  If I had a 50 ohm load
>and a 50v voltage source, I would get the maximum power to the
>load with the lowest source impedance, i.e. 0 ohms.  The power
>would be V^2/50.  If I had a source impedance, 50 ohms, the
>power to the load is reduced by 75% since the total power is
>reduced by one half and the power is shared between the
>impedances.

That is fine, but remember the PA is a power limited source (as most
sources are).

As the resistance of the load is lowered, eventually the finite power
available will limit current. The voltage will fall, yet no more current
will be available. The problem we have occurs because we are conditioned
to have a mindset. The mindset tells us current limiting must come from a
"resistor" somewhere that dissipates power.

That is an incorrect view. Current, voltage, or power limiting can come
from a non-dissipating resistance or impedance.

Going back to a more basic circuit may help. For example, consider a
generator with perfect (or close to perfect) construction. Assume the
shaft is driven by an infinite source of power (or a souce much larger
than the load power requires). If field winding current and the internal
magnetic field is limited, the power available from generator will also be
limited. As generator loading is increased at some point maximum power
extraction occurs. Lighter loading will cause the voltage to rise less
rapidly than the current decrease, and heavier loading will cause the
voltage to drop faster than the load current increases.

The generator behaves as if limited by an internal resistance, yet there
is no internal heat produced! It is a impedance limited source! That is
why generators can be very efficient even when maximum power is being
drawn. Maximum efficiency occurs very near the point of maximum power
transfer to the load in a well designed generator system.

>The maximum power transfer theorem applies to finding a load
>that matches the source impedance.  Since we have fixed in our
>minds that the load is always 50 ohms, we tend to think using
>the theorem that the source impedance should be 50 ohms for
>maximum power transfer.  This is not true.

Of course it is. Otherwise the theorem is incorrect. The problem is as I
tried to illustrate above. We are conditioned to have a mindset that
anything that limits power must dissipate power. That isn't true. Let me
give another example using the generator.

Consider what would happen if the field winding has unlimited flux, and
the shaft is driven by a water wheel. If output loading were increased,
the wheel would simply slow down. No heat would be produced. At a certain
value of load impedance, maximum power is transferred. The efficiency of
the generator can be 99% at this point. Yet it is the point of conjugate
match. Let's say this point was 50 volts at one ampere.

If we inserted a source in series with the load and wiggled the voltage
across the load, we would see the current CHANGE required to wiggle the
voltage across the load 1 volt would be .02 amperes. Looking back at the
generator, it would look like it was trying to wiggle 50 ohms in the
source, even though it's an impedance rather than an actual resistor.

>My confusion comes from the effect of SWR when the source
>impedance is not 50 ohms.  I had assumed that it would have
>the same effect at either end.  But I am not sure that it would
>change the power transfer on a transmission line if the source
>is not matched to the line.

All we can be sure of is maximum power is transferred to the load. January
QST Exploring RF seems to illustrate ( and perhaps re-enforce) this
misconception very well. The attenuation of an attenuator is exactly as
designed when the load and attenuator have the same design impedance. The
source impedance does n


From [e-mail] Wed Jan 17 14:23:51 1996
Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!uunet!in2.uu.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!news.cyberstore.ca!van-bc!news.mindlink.net!uniserve!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!news.magi.com!newsadm
From: Kilgore Trout <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Shogun TV Antenna?
Date: 15 Jan 1996 19:22:41 GMT
Organization: RAMJAC Corporation
Lines: 12
Message-ID: <4de9i1$[e-mail]>
NNTP-Posting-Host: magi04p46.magi.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Does anyone have any experience with this type of TV antenna? It looks like a
tube/rod instead of the typical TV antenna. I was thinking of replacing the on
e on
my cottage which got hit by a falling tree. Recommendations on TV antennas?

Also, does anyone have any recommendations on improving reception? Do any of t
he
electronic gizmos help or is this strictly related to having a good antenna an
d
location?

Thanks in advance from the Great White North...

KT



From [e-mail] Wed Jan 17 14:23:52 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news-feed.mci.newscorp.com!uunet!in2.uu.net!csn!nntp-xfer-2.csn.net!yuma!usenet
From: fiz <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Source of Al tubing?
Date: Tue, 16 Jan 1996 16:39:53 -0700
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 6
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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Hi,

I'm looking for a source of Al tubing to build some antennas. Any
suggestions?

ttfn fiz (KG0YG)


From [e-mail] Wed Jan 17 14:23:53 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.sfo.com!news.zeitgeist.net!bdt.com!rmstar.efi.com!nntp-hub.barrnet.net!inet-nntp-gw-1.us.oracle.com!news.internetMCI.com!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 12 Jan 1996 20:16:16 GMT
Organization: ELNEC/EZNEC Software
Lines: 30
Message-ID: <4d6fig$[e-mail]>
References: <4d3cdj$[e-mail]>
NNTP-Posting-Host: ip-pdx02-49.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   [e-mail] (Cecil A. Moore~) writes:
>  In article <4d084u$[e-mail]>,
>  W8JI  Tom <[e-mail]> wrote:
>
>  >... Or do you fear the response would be another
>  >example of "we told you how it is, and so it must be"?
>
>  Hi Tom, I have written numerous letters to Sterba and gotten
>  absolutely no response. Worldradio responds nicely to letters
>  addressed to the magazine but probably passes letters addressed
>  to Sterba directly on to Him. . .

A letter I wrote a while back was sent both to the editor and to
"Sterba". He responded to the letter in his column without
printing the letter or naming its writer.

Another bit of evidence that he reads them -- In my letter I got
on his case about using "S-Units" as a measurement unit (one of
my hot buttons) and suggested that if he insists on using a 6-dB
unit of measurement, he ought to call it a "Sterby", not an "S-Unit".
(This is because the units on receivers' S-meters are seldom 6 dB
and may be GREATLY different from 6.) Anyway, a couple of columns
ago, there it is.

At least he's capable of learning, just not capable of giving
credit or acknowledging errors. But he does help sell magazines,
just like Uncle Wayne.

Roy Lewallen, W7EL



From [e-mail] Wed Jan 17 14:23:54 1996
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From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Sat, 13 Jan 96 01:42:03 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 15
Message-ID: <[e-mail]>
References: <4cuduv$[e-mail]> <[e-mail]>
NNTP-Posting-Host: bos1d.delphi.com
X-To: <[e-mail]>

<[e-mail]> writes:

>I have trouble believing that a guy who writes about tuning up garbage cans,
>grocery carts and beer can verticals and who rounds all his d.b. figures to t
he
>nearest whole number REALLY believes he operates a "perfect circle"
>antenna, except to mention it "tongue-in-cheek". This is his writing style: t
hat
>of a self-deprecating ironic sarcasm.
>No offense intended (I mean that!) but you gotta get out of the laboratory
>and into an English lit course.


No offense taken. I'm just disappointed that you didn't recognize
my tongue-in-cheek, self-deprecating ironic sarcasm. ;-)

73, Cecil, KG7BK, OOTC


From [e-mail] Wed Jan 17 14:23:55 1996
Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!news.sics.se!news.kth.se!news.eunet.fi!EU.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!scorpion.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 11 Jan 1996 16:04:03 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 22
Distribution: world
Message-ID: <4d3cdj$[e-mail]>
References: <4cuduv$[e-mail]> <4d084u$[e-mail]>
NNTP-Posting-Host: scorpion.ch.intel.com

In article <4d084u$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:

>... Or do you fear the response would be another
>example of "we told you how it is, and so it must be"?

Hi Tom, I have written numerous letters to Sterba and gotten
absolutely no response. Worldradio responds nicely to letters
addressed to the magazine but probably passes letters addressed
to Sterba directly on to Him.

In a newsgroup posting with another netter, I used the words
"as if". Sterba devoted 1/3 of His column the next month to
blasting me for the use of those words as being non-scientific.
He was trying to hold me to a high standard and that's OK. I
just want Him not to be a hypocrite and to hold Himself to the
standards that He asks from me and others.

Sterba says He has an antenna that is a "perfect circle". Seems
that is a more ridiculous statement than my use of "as if".

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Wed Jan 17 14:23:56 1996
Path: news.epix.net!news.sprintlink.net!grumpy.insinc.net!www.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!news.bluesky.net!gatech!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!nwfocus.wa.com!ender.techcenter.paccar.com!news
From: [e-mail] (Michael A. Sterba)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 11 Jan 1996 08:20:48 GMT
Organization: OES Skagit County WA.
Lines: 19
Distribution: world
Message-ID: <4d2h90$[e-mail]>
References: <4cuduv$[e-mail]> <[e-mail]>
NNTP-Posting-Host: kg7hq.paccar.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.4

Hello Cecil and Group,

In article <[e-mail]>, [e-mail] says...
(Cecil A. Moore~) writes:
>I have trouble believing that a guy who writes about tuning up garbage cans,
>grocery carts and beer can verticals and who rounds all his d.b. figures to t
he
>nearest whole number REALLY believes he operates a "perfect circle"
>antenna, except to mention it "tongue-in-cheek". This is his writing style: t
hat
>of a self-deprecating ironic sarcasm.
>No offense intended (I mean that!) but you gotta get out of the laboratory
>and into an English lit course.

I think your right here. :) Real world antenna problems are bit harder to deal
 with and
a laboratory simulation.<grin>
At least this is what this real "Sterba" has found.
--
                "Handcrafted From The Finest ASCII"
73's de KG7HQ



From [e-mail] Wed Jan 17 14:23:57 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 14 Jan 1996 05:59:07 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 37
Sender: [e-mail]
Message-ID: <4danlr$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Will,

I wrote:
>> The only problem with Sterba is he makes mistakes, and doesn't allow
>> anyone to correct them. That makes his column a poor forum for
education,
>> because it everything in it is just his opinion.
>> It should be read for entertainment, but not for knowlege enhancement.

You wrote:
>
>Tom, I wonder of you can provide any facts to back up your claim?

Cecil just mentioned a few recent problems. My experience was years ago
when I wrote to him about some grave technical errors concerning radiation
resistance, ground systems, and verticals. I even included references. His
response was to make a few wise comments and out of context half truths
about what "some W8" said and go on with the same incorrect information.
Unfortunately that was too long ago to recall the specific language he
used.

>fan of Sterba's it never occurred to me to consider him inerrant, but as
>a lifetime subscriber to WORLDRADIO, I have yet to see him fail to admit
>a mistake.  Maybe I have missed something.

Probably you have missed something, hi. How would you know when he made a
mistake, if he edits all the responses and extracts little areas that he
dances around?
Look at it this way......You read his column and trust him to provide the
correct data. If he never prints or responds to letters that point out
errors, how would you know he ever even made an error?

Anyway, I'm sure it's 90% acting just to generate attenation. I just hope
anyone trying to get a fair view or to seriously learn how something works
keeps that in mind.

73 Tom


From [e-mail] Wed Jan 17 14:23:59 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!news.itd.umich.edu!newsxfer2.itd.umich.edu!gatech!sdd.hp.com!hp-pcd!hp-cv!reuter.cse.ogi.edu!news.ogitel.net!seikotsi.com!usenet
From: [e-mail] (KG7FU)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Mon, 15 Jan 1996 17:16:38 GMT
Organization: Seiko Communications Systems Inc., Beaverton, Oregon, USA.
Lines: 53
Message-ID: <4de25m$[e-mail]>
References: <4cuduv$[e-mail]>
NNTP-Posting-Host: 198.3.253.45
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Cecil A. Moore~) wrote:

>In the Feb '96 "Aerials" column, Kurt N. Sterba blasts antenna
>manufacturers for making outrageous claims and then turns
>around and makes an outrageous claim for his own antenna.

There's not a difference between manufacturing a product for sale,
misleading the consumer about it's specifications and making an honest
mistake about your hombrew job?

>"I fully know that the triangle will be some ... fraction of
>a dB down from a square. I myself run mine in the form of a
>perfect circle."

Try taking it in context. I'm sure he meant a circle as opposed to
something less than square or triangular.

>Wow, "a perfect circle". An antenna whose height above ground
>does not vary by even an infinitesimal amount and whose diameter
>does not vary by even an infinitesimal amount. Sterba must be
>the only person in the universe with "a perfect circle" antenna.
>Of course, he also has perfectly flat ground under his antenna
>or else it wouldn't be "a perfect circle". And of course, he
>also has perfect wire or else it wouldn't be "a perfect circle".
>Dang, the man and everything around him must be perfect.

You're putting way too many words into his discription and have missed
the point entirely. BTW: what does "perfectly flat ground" have to do
with the ability to construct a "perfect" cricle above it? I've
installed plenty of horizontal antenna structures with out the benefit
of level terrain.

>Kurt, I'll bet you $100 that your antenna is not a perfect
>circle and that your claim is exaggerated exactly like the
>claims of the antenna manufacturers you love to criticize.

I'll bet you his "perfect circle" is closer to truth than some
advertisements in 73 Magazine vis-a-vis gain specifications.

>73, Cecil, KG7BK, OOTC  (not speaking for my employer)

Being in the broadcast industry I have to question why some amateur
product manufacturers make wild claims about their product. If a
broadcast antenna manufacturer advertised in a similar fashion there'd
be reports with technical back-up in all the trade journals slamming
the faux-pas. I'm surprised, actually, that Mr. Sterba doesn't
actually let us know the names of these outfits. Ever wonder why QST
ads NEVER have gain specs? Why is it o.k. for and amateur oriented
manufacturer to do this? I'd rather suffer the consequences without
their product than be made to feel stupid.

KG7FU



From [e-mail] Wed Jan 17 14:24:00 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr6ip49.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Mon, 15 Jan 1996 21:32:28 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 50
Message-ID: <[e-mail]>
References: <4cuduv$[e-mail]> <4de25m$[e-mail]>
NNTP-Posting-Host: usr6ip49.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <4de25m$[e-mail]> [e-mail] (KG7FU) writes
:
>From: [e-mail] (KG7FU)
>Subject: Re: Sterba again
>Date: Mon, 15 Jan 1996 17:16:38 GMT

>[e-mail] (Cecil A. Moore~) wrote:

>>In the Feb '96 "Aerials" column, Kurt N. Sterba blasts antenna
>>manufacturers for making outrageous claims and then turns
>>around and makes an outrageous claim for his own antenna.

>There's not a difference between manufacturing a product for sale,
>misleading the consumer about it's specifications and making an honest
>mistake about your hombrew job?

I don't subscribe to this rag, but I did get a promo copy.  I used it to line
the bird cage, so I can't refer to it, however, I seem to remember part
of the editorial discussing an appeal to the "common non-techie (wo)man."

If indeed, the purpose is to educate the beginner, then it is a grave
disservice to mislead the newcomer with some of the hair-brained ideas
(including this one) offered in this publication. I have made similar
complaints to ARRL regarding some of the same kinds of errors published in the

New Ham Companion section of QST. In this endeavor, I have been in the company

people of the caliber of John Belrose, et al. Neither of these publications
seems to be willing to acknowledge any of this in print.

In my opinion, the very last place errors should occur is in writings directed

to beginners. Those of us in this forum are (mostly) better able to evaluate
these things and can have (usually) reasoned discussions about them and
separate the wheat from the chaff.

>Being in the broadcast industry I have to question why some amateur
>product manufacturers make wild claims about their product. If a
>broadcast antenna manufacturer advertised in a similar fashion there'd
>be reports with technical back-up in all the trade journals slamming
>the faux-pas. I'm surprised, actually, that Mr. Sterba doesn't
>actually let us know the names of these outfits. Ever wonder why QST
>ads NEVER have gain specs? Why is it o.k. for and amateur oriented
>manufacturer to do this? I'd rather suffer the consequences without
>their product than be made to feel stupid.

I know why ARRL claims to not publish manufacturer's antenna gain numbers.
Sure they are inflated like auto horsepower ratings, but then take a look at
the rest of the ads in QST and see all of the other unproven or misleading
superlatives which are unchallenged. That's show biz.

>KG7FU

Wes -- N7WS


From [e-mail] Wed Jan 17 14:24:01 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Tue, 16 Jan 96 22:16:09 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 10
Message-ID: <[e-mail]>
References: <4d2h90$[e-mail]> <4d5cv9$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4dhglb$[e-mail]>
NNTP-Posting-Host: bos1g.delphi.com
X-To: <[e-mail]>

<[e-mail]> writes:

>      doubling the power raises three dB. Well, one must raise the
>      voltage by six times to gain three dB."
>

Wonder what kind of calculator Sterba uses. Mine says if v2/v1=6 then
that's almost 16 dB.

73, Cecil, KG7BK, OOTC


From [e-mail] Wed Jan 17 14:24:02 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.mind.net!news.onramp.net!newshost.convex.com!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!atkes
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 17 Jan 1996 00:42:19 GMT
Organization: Arizona State University
Lines: 13
Message-ID: <4dhglb$[e-mail]>
References: <4d2h90$[e-mail]> <4d5cv9$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: general2.asu.edu
X-Newsreader: TIN [version 1.2 PL2]

[e-mail] wrote:
: Cecil Moore <[e-mail]> writes:
:
: it exactly...... and Cecil, you must be the only one in the world that didn'
t
: catch that the "perfect circle" was a JOKE!!!!!!Go the the newstand ang get
: a copy of MAD magazine....pay someone to explain the gags to you.

Kurt had an even better joke in the January 96 Aerials column:
     "Now we'll get to learning. First, just about all know that
      doubling the power raises three dB. Well, one must raise the
      voltage by six times to gain three dB."




From [e-mail] Wed Jan 17 14:24:03 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!spool.mu.edu!howland.reston.ans.net!news1.digex.net!news.crosslink.net!en.com!usenet
From: "Steven M. Evans" <[e-mail]>
Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna
Subject: SW/MW Antennas evaluations
Date: 11 Jan 1996 19:35:58 GMT
Organization: Exchange Network Services
Lines: 27
Message-ID: <4d3or0$[e-mail]>
NNTP-Posting-Host: l2-1.en.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-URL: news:rec.radio.shortwave
Xref: news.epix.net rec.radio.shortwave:68762 rec.radio.amateur.antenna:18401

At the Grove web site I found the following antennas listed and am
wondering if anyone has used these and found them to be useful, or have
you seen reviews written about them.

Grove Skywire Antenna               Outdoor dipole provides worldwide sw
                                    reception!

Stoner-Dymek Active Antenna         The best 50 kHz-30 MHz active,
                                    receiving antenna available!

Grove Mini-Skywire                  Short on Yard Space?

Select-A-Tenna Medium Wave Loop Antenna Booster
                                    Ideal for Apartment Dwellers!

Realistic Amplified Shortwave Antenna
                                    Active Antenna and A Preselector
                                    All-In-One!

KIWA MW Air-Core Loop Antenna       High Performance!

Universal Reel Antenna for Shortwave Portables!
                                    Ideal For Apartment Dwellers!

Thanks for your help!




From [e-mail] Wed Jan 17 14:24:04 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Radiomatt)
Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna
Subject: Re: SW/MW Antennas evaluations
Date: 13 Jan 1996 07:41:36 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <4d89a0$[e-mail]>
References: <4d3or0$[e-mail]>
Reply-To: [e-mail] (Radiomatt)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: news.epix.net rec.radio.shortwave:68811 rec.radio.amateur.antenna:18432

The KIWA is superb, but only for AM broadcast (540 kHz to 1705 kHz).
A longwire, whether by Grove or anybody else is cheapest/best if you can
get it up at least 25 feet, and over 35 feet long.
Forget the R/S active antenna unless you need one for traveling with a SW
radio and want to use it in hotel rooms, etc.
I use longwires (plus a KIWA for AM/BC), but for SW I have 3 McKay Dymek
DA-100s. I feed them to different receivers and they are as sensitive as
the 40-50 foot longwires I have, but a lot smaller and less visibly
obtrusive (to my wife). They reach from longwave to 30 MHz andare the best
all-around unit you can get.


From [e-mail] Wed Jan 17 14:24:06 1996
Path: news.epix.net!news.sprintlink.net!usit.net!news
From: [e-mail] (Steven Fritts)
Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna
Subject: Re: SW/MW Antennas evaluations
Date: Sat, 13 Jan 1996 17:22:38 GMT
Organization: United States Internet, Inc.
Lines: 34
Message-ID: <4d8pu6$[e-mail]>
References: <4d3or0$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bway-slip110.dynamic.usit.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.shortwave:68815 rec.radio.amateur.antenna:18435

"Steven M. Evans" <[e-mail]> wrote:

>At the Grove web site I found the following antennas listed and am
>wondering if anyone has used these and found them to be useful, or have
>you seen reviews written about them.

>Grove Skywire Antenna               Outdoor dipole provides worldwide sw
>                                    reception!

>Stoner-Dymek Active Antenna         The best 50 kHz-30 MHz active,
>                                    receiving antenna available!

>Grove Mini-Skywire                  Short on Yard Space?

>Select-A-Tenna Medium Wave Loop Antenna Booster
>                                    Ideal for Apartment Dwellers!

>Realistic Amplified Shortwave Antenna
>                                    Active Antenna and A Preselector
>                                    All-In-One!

>KIWA MW Air-Core Loop Antenna       High Performance!

>Universal Reel Antenna for Shortwave Portables!
>                                    Ideal For Apartment Dwellers!

>Thanks for your help!


While it was not listed, I am using among others, the Sony ANT-1 with
excellent results. Great little antenna!

Steve



From [e-mail] Wed Jan 17 14:24:07 1996
Path: news.epix.net!usenet
From: [e-mail] (Scott Walker)
Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna
Subject: Re: SW/MW Antennas evaluations
Date: 17 Jan 1996 16:23:17 GMT
Organization: epix.net
Lines: 22
Message-ID: <4dj7pl$[e-mail]>
References: <4d3or0$[e-mail]>
NNTP-Posting-Host: lwbyppp182.epix.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news.epix.net rec.radio.shortwave:68959 rec.radio.amateur.antenna:18516

In article <4d3or0$[e-mail]>, [e-mail] says...
>
>At the Grove web site I found the following antennas listed and am
>wondering if anyone has used these and found them to be useful,

I have a Kiwa for MW.  Its great, giving excellent sensitivity PLUS the
ability to null-out interfering adjacent signals and/or local noise.

I have a McKay-Dymek DA100D active antenna (older version of the one at
Grove?)  that I use for SW.  Its sensitive enough for those of us with no room

for longwires, but it is susceptible to locally generated noise, which I have
a lot of.  Ideally I would have both it AND a longwire, and switch between
them based upon my target...

--
************************************************
* Scott Walker                                 *
* [e-mail]                      *
*                       ***                    *
*    "Age Quod Agis." - Jerry Brown, 1992      *
************************************************



From [e-mail] Wed Jan 17 14:24:08 1996
Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!news.sics.se!news.kth.se!news.eunet.fi!EU.net!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!news.trw.com!news2.trw.com!alpha.nafb.trw.com!sysadmin
From: [e-mail] (Bob Wartburg)
Newsgroups: rec.radio.amateur.antenna
Subject: Tower Specs
Date: 11 Jan 1996 19:25:57 GMT
Organization: TRW
Lines: 8
Message-ID: <4d3o85$[e-mail]>
NNTP-Posting-Host: sp232
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

Tower specifications state the tower will withstand a 50 MPH wind for a
given antenna wind area. If an antenna has 1/2 of this given wind area,
can the tower take 100 MPH winds?

Thanks

Bob K0LLO



From [e-mail] Wed Jan 17 14:24:08 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!in-news.erinet.com!imci3!imci2!newsfeed.internetmci.com!news.ro.com!usenet
From: Jim Kinney <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Tower Specs
Date: Mon, 15 Jan 1996 03:23:18 +0000
Organization: RENAISSANCE INTERNET SERVICES
Lines: 18
Message-ID: <[e-mail]>
References: <4d3o85$[e-mail]>
NNTP-Posting-Host: ts4p7.ro.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.0b3 (Win95; I)

Bob Wartburg wrote:
>
> Tower specifications state the tower will withstand a 50 MPH wind for a
> given antenna wind area. If an antenna has 1/2 of this given wind area,
> can the tower take 100 MPH winds?
>
> Thanks
>
> Bob K0LLO

If you consider the antenna only the tower could support 1/4 the antenna
at twice the wind velocity.  The force equation is P=.004V*2.  If you
consider the tower and the antenna together, the tower may not support
itself at 100 mph let alone the tower and an antenna.

Hope this helps.

73's Jim WB7ECS


From [e-mail] Wed Jan 17 14:24:10 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.netzone.com!news.rtd.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!sdd.hp.com!col.hp.com!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger
From: [e-mail] (COUGER GORDON)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Tower Specs
Date: 12 Jan 1996 01:53:38 GMT
Organization: CEAT at Oklahoma State University, Stillwater
Lines: 15
Message-ID: <4d4ev2$[e-mail]>
References: <4d3o85$[e-mail]>
Reply-To: Gordon Couger <[e-mail]>
NNTP-Posting-Host: master.ceat.okstate.edu

In article <4d3o85$[e-mail]>,
Bob Wartburg <[e-mail]> wrote:
>Tower specifications state the tower will withstand a 50 MPH wind for a
>given antenna wind area. If an antenna has 1/2 of this given wind area,
>can the tower take 100 MPH winds?
>
The drag (wind load of the antenna) is proportional to the velocity squared.
So wind load on an anttena with half the wind load area will produce a
good deal more than twice the wind load if the wind speed is doubled.

Gordon AB5DG
   Gordon Couger
   Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075
   [e-mail] 405 744 8392 day 625-2855 evenings



From [e-mail] Wed Jan 17 14:24:10 1996
Path: news.epix.net!news.sprintlink.net!news.socketis.net!op014
From: [e-mail] (jmleveron)
Newsgroups: rec.radio.amateur.antenna
Subject: Transportable Antenna?
Date: Mon, 15 Jan 96 02:12:36 GMT
Organization: SOCKET Internet Services
Lines: 8
Message-ID: <4dcicr$[e-mail]>
NNTP-Posting-Host: 205.242.94.64
X-Newsreader: News Xpress Version 1.0 Beta #4

I would like to get some opinions on a good, back-packable
(or readily vehicle transportable) omnidirectional and/or
dir. antenna for 2m.  I'm looking for something with high
gain.  J-pole, di Zepp, dipole, 5/8; whatever works is
great!  FM phone is only mode needed.  Will be powering
this from a 5 watt handheld.  Thanks for your replies!

73 de John


From [e-mail] Wed Jan 17 14:24:11 1996
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Transportable Antenna?
Message-ID: <[e-mail]>
From: Bill Harwood <[e-mail]>
Date: Tue, 16 Jan 1996 20:17:26 GMT
Sender: [e-mail] (NAWS news admin)
References: <4dcicr$[e-mail]>
Organization: NAWS, China Lake, CA
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To: [e-mail]
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Mime-Version: 1.0
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Lines: 15

Try the Antennas West roll up J-pole or if you are a builder build one.
Use ladder line and make a j-pole antenna.  Some COAX to a BNC on the
bottom and a place to hook a fishing line on the top.  The fishing line
goes over something high and you hois up the ladder line and hook to
your HT.

Good Luck

  \------------------------------------------------------/
   \  Bill Harwood           U play it, I'll dance it   /
    \ AB6DY                         or                 /
     \                      I'll play it, U dance it  /
      \----------------------------------------------/




From [e-mail] Wed Jan 17 14:24:13 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!news.fibr.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: VHF/UHF Log Periodic
Date: 13 Jan 1996 06:31:01 -0700
Organization: Primenet Services for the Internet
Lines: 12
Sender: [e-mail]
Message-ID: <4d8c6l$[e-mail]>
References: <4c3it8$[e-mail]> <4d69k7$n36$[e-mail]>
Reply-To: [e-mail]
X-Posted-By: ip157.fhu.primenet.com
X-Newsreader: IBM NewsReader/2 v1.03

In <4d69k7$n36$[e-mail]>, Roger A. Cox <75052.3037@Co
mpuServe.COM> writes:
>I have written a DOS program that can be used to design or
>analyze LPDA antennas.  Look for LPCAD.EXE or LPCAD.ZIP on
>CompuServe's HAMNET Library or at ftp.nic.funet.fi in the Ham
>antenna area.  LPCAD ver. 2 has a few more graphics than ver.
>1.37 but is essentially the same.
>
>73, Roger WB0DGF

Does the program work for HF Log Periodics also

73, Mike


From [e-mail] Wed Jan 17 14:24:14 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!uunet!in2.uu.net!news.spss.com!uchinews!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Roger A. Cox <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: VHF/UHF Log Periodic
Date: 12 Jan 1996 18:34:47 GMT
Organization: Telex Communications, Inc.
Lines: 7
Message-ID: <4d69k7$n36$[e-mail]>
References: <4c3it8$[e-mail]>

I have written a DOS program that can be used to design or
analyze LPDA antennas.  Look for LPCAD.EXE or LPCAD.ZIP on
CompuServe's HAMNET Library or at ftp.nic.funet.fi in the Ham
antenna area.  LPCAD ver. 2 has a few more graphics than ver.
1.37 but is essentially the same.

73, Roger WB0DGF


From [e-mail] Wed Jan 17 14:24:14 1996
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!grumpy.insinc.net!news.bconnex.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!howland.reston.ans.net!nctuccca.edu.tw!news.cc.nctu.edu.tw!ccnews.ncku.edu.tw!sparc12!n2683244
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Wanted: Smith Chart on PC
Date: 12 Jan 1996 13:14:30 GMT
Organization: Computer Center, NCKU, Tainan, Taiwan, R.O.C.
Lines: 19
Message-ID: <4d5mrm$[e-mail]>
NNTP-Posting-Host: sparc12.cc.ncku.edu.tw
X-Newsreader: TIN [version 1.2 PL2]

ubject: Wanted: Smith Chart on PC
Newsgroups: sci.electronics.design
Summary:
Keywords:


Hi there :


       I am in urgent need of a PC software which can help me to draw
       Smith Chart on PC and even process the Chart on PC ....
       I wonder if there is any free-shared software to help. If you know
       please let me know.... Thank in advance !



Clifford




From [e-mail] Wed Jan 17 14:24:15 1996
Path: news.epix.net!news.sprintlink.net!hookup!bloom-beacon.mit.edu!crl.dec.com!caen!sol.ctr.columbia.edu!news.mindlink.net!van-bc!uniserve!news.uniserve.com!usenet
From: Jeff <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: What kind of HF antena using space of apartment's balconi?
Date: 11 Jan 1996 00:37:43 GMT
Organization: UNIServe
Lines: 14
Message-ID: <4d1m4n$[e-mail]>
NNTP-Posting-Host: van0111.tvs.net

[e-mail] (Gun Kim) writes:
> Hellow!
> I'm biginner of amateur radio,in South Korea.
> I have 2m and HF all band Rig.
> But I am in a difficulty to construct antena system.
> I need information for using apartment's balconi.
>
> thanks,
> DE DS1AFL 73~~
>
try using a Antron 99 laying horizontal. Spoke with ham in
the east that had been using one for several years and has
had nothing but success. With good swr from 14 mhz through
30 mhz.                                   Good Luck


From [e-mail] Wed Jan 17 14:24:16 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.ro.com!usenet
From: "John D. Farr" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Wind Load
Date: Sun, 14 Jan 1996 01:44:16 -0600
Organization: RENAISSANCE INTERNET SERVICES
Lines: 21
Message-ID: <[e-mail]>
References: <4da9jg$[e-mail]>
NNTP-Posting-Host: ts1p1.ro.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b4 (Win95; I)
To: W2FOE <[e-mail]>

W2FOE wrote:
>
> I'm trying to design an antenna support.  How does one convert wind
> velocity to force in pounds per square foot?
>
> Thanks, Merv


try:

p = 0.004 v^2

where p is peak pressure (lb/ft^2) and v is the mean wind speed (mi/h).

this is from "Physical Design of Yagi Antennas" by David B. Leeson,
W6QHS.  It is sold by the ARRL and is an excellent reference for any
antenna design.

73

John KC4ZXX


From [e-mail] Wed Jan 17 14:24:17 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W2FOE)
Newsgroups: rec.radio.amateur.antenna
Subject: Wind Load
Date: 14 Jan 1996 01:58:56 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <4da9jg$[e-mail]>
X-Newsreader: AOL Offline Reader

I'm trying to design an antenna support.  How does one convert wind
velocity to force in pounds per square foot?

Thanks, Merv


From [e-mail] Wed Jan 17 14:24:18 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news1!ind-000-236-49
From: [e-mail] (Patrick Croft)
Subject: WTB: ROHN 45/55 TOWERS!!!
X-Nntp-Posting-Host: ind-000-236-49.iquest.net
Message-ID: <[e-mail]>
Keywords: TOWERS
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
X-Newsreader: News Xpress Version 1.0 Beta #2.1
Date: Sat, 13 Jan 1996 16:47:36 GMT
Lines: 12

I'm hunting sections of Rohn 45 and/or 55 towers, and the various hardware acc
essories that go with them.
 Additionally, I'm interested in buying a RTS  (Dick Weber)  rotating tower sy
stem or parts  for Rohn 25,45,55.
     PLEASE EMAIL ME WHAT YOU HAVE - EVEN A SINGLE SECTION OF TOWER CONSIDERED
!
With all the swap nets, corners of garages holding 'spares', and plans that ge
t changed, keep this WTB in mind
when you hear someone looking to sell!  Somebody's got to have some somewhere!

Thanks!                       WB9IQI  -  Patrick Croft
                                  Daytime Tel:[phone]
                                          Fax:[phone]
                                        email:[e-mail]




From [e-mail] Wed Jan 17 14:24:19 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!usenet.seri.re.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WTB: ROHN 45/55 TOWERS!!!
Date: 14 Jan 1996 21:17:06 GMT
Organization: Texas A&M University, College Station, TX
Lines: 29
Message-ID: <4dbrsi$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 128.194.44.219
X-Newsreader: IBM NewsReader/2 v1.2

In <[e-mail]>, [e-mail] (Patrick Croft) writes:
>I'm hunting sections of Rohn 45 and/or 55 towers, and the various hardware ac
cessories that go with them.
> Additionally, I'm interested in buying a RTS  (Dick Weber)  rotating tower s
ystem or parts  for Rohn 25,45,55.
>     PLEASE EMAIL ME WHAT YOU HAVE - EVEN A SINGLE SECTION OF TOWER CONSIDERE
D!
>With all the swap nets, corners of garages holding 'spares', and plans that g
et changed, keep this WTB in mind
>when you hear someone looking to sell!  Somebody's got to have some somewhere
!
>
>Thanks!                       WB9IQI  -  Patrick Croft
>                                  Daytime Tel:[phone]
>                                          Fax:[phone]
>                                        email:[e-mail]
>
>

Gerald Williams, the proprieter of Texas Towers in Plano, TX, stocks the
entire stuff for Weber's systems.  At least a month ago, he told me he was
going to go back and re-stock it.

When Weber first started putting out the hardware, Gerald stocked it, then
gave up on it for a while.

However, when I expresesed interest in finally going through with the idea
down here, he told me that he was going back into holding the stuff.

It isn't a small project......

:)

Mike Luther W5WQN as a guest at leviathan.tamu.edu


From [e-mail] Wed Jan 17 14:24:20 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news
From: Frank Scutch <[e-mail]>
Subject: WTD: Design for 17 meter Quad
Content-Type: text/plain; charset=us-ascii
Organization: Motorola, Inc.
Date: Mon, 15 Jan 1996 15:45:23 GMT
Message-ID: <[e-mail]>
X-Mailer: Mozilla 1.1 (Macintosh; U; 68K)
Mime-Version: 1.0
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Lines: 12

Hello Fellas:

I am not an experienced antenna builder but am wondering if someone
could suggest or has the plans for a easy to build 2 element 17 meter
quad.  I am looking to experiment and am hoping to find something I can
easily get parts for and can put together w/o much trouble.  I would
prefer something with a smaller boom no more than 8ft or so.  Any
suggestions?

Frank, WB4AYJ




From [e-mail] Mon Jan 22 19:53:22 1996
Path: news.epix.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: !!! HOT High Tech WWW Site !!!
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Covering Amateur Radio, Electronics, Engineering, Space, Scanners
Shortwave, and many more interesting Technical Areas.  Includes
0ver 400 WWW links, and a link to our September 95 CD-ROM archive
with over 23,000 files online.  Very HOT High Tech WWW Site

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         Surf The High Tech World from here today!





From [e-mail] Mon Jan 22 19:53:23 1996
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From: [e-mail] (kazumasa kawase)
Newsgroups: rec.radio.amateur.antenna
Subject: (none)
Date: 16 Jan 96 13:20:13 GMT
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NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

subscribe



From [e-mail] Mon Jan 22 19:53:24 1996
Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 100 MHz Noise Cancel Ant?
Date: 16 Jan 1996 20:31:47 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 19
Message-ID: <4dh1vj$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Greg Prior ([e-mail]) wrote:
: I have been looking for an antenna for my FM (broadcast band) radio.  The
: challenge is: I want to use it in my work building which has LOTS of PCs nea
rby.
: Most of what I hear on the radio is computer buz.  Does anyone know of a sma
ll
: (I have a Sony ICF-2001 in a cubicle) antenna that can be purchased or built
 (I
: like to build) for this situation?  Or maybe the answere is filtering?

If you are constrained to keep the antenna inside, I'm afraid the answer is
filtering alright.  Filtering on each PC that's emitting noise.
Undoubtedly the noise is being "transmitted" by the PCs on the frequencies
you want to listen to, and unless you get your antenna away from the noise
or the noise away from the antenna, you are going to have problems.
Polarization of the antenna or directionality of the sort you can
reasonably get indoors is unlikely to help.

--
Cheers,
Tom
[e-mail]


From [e-mail] Mon Jan 22 19:53:25 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!csulb.edu!drivel.ics.uci.edu!news.service.uci.edu!usenet
From: [e-mail] (Brian Williams)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 2 meter antenna for Ford Aspire
Date: 17 Jan 1996 20:40:07 GMT
Organization: UCI Medical Center
Lines: 19
Message-ID: <4djmr7$[e-mail]>
References: <4d789r$[e-mail]>
NNTP-Posting-Host: dialin9110.slip.uci.edu
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <4d789r$[e-mail]>, [e-mail] says...
>I need a 1/4 wave antenna that does NOT require drilling.  Can someone
>out there suggest an antenna?
>Bob Werner

Bob,
If you would like a stealth antenna, and don't care about AM reception,
you could also install a coupler that allows you to replace your am/fm
antenna on the cars fender and replace it with a 1/4 wave 2 meter ant.
With the coupler attached, you can still receive fm and 2 meter at the
same time without danger of blowing out your am/fm radio when you
transmitter. If you wish I can find out what the power capability is
and approx. prices.  I did this to my company car, and when it was time
to turn it in, it took me about 20 minutes to return it to normal.  I'm
currently using on my '67 mustang and it works pretty well.  Radiation
pattern isn't as good as an antenna in the middle of the roof, but no
damage to paint and it seems to do a better job (INHO) than when I was
using a glass mount (but it is more expensive). Good luck,  Brian N6ZAU



From [e-mail] Mon Jan 22 19:53:27 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.mel.connect.com.au!yarrina.connect.com.au!diablo.OntheNet.com.au!news
From: Jon Jenkins <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Announce: New RF Design sw for Windows
Date: 17 Jan 1996 20:42:48 GMT
Organization: Academic Technologies
Lines: 94
Message-ID: <4djn08$[e-mail]>
NNTP-Posting-Host: ts-gc-3-p2.onthenet.com.au
Mime-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

        RF: The Analog Analysis Program

        by Academic Technologies

RF is a new inexpensive circuit simulation sw package for
Windows, Windows 95 and Windows NT. It is primarily
intended for Radio Frequency design but is applicable
to all frequencies.

Come and have a look, visit out Web site at:

http://www.onthenet.com.au/~academic/Welcome.htm

or download the readme.txt and rfdemo.zip demo
version from:

ftp.onthenet.com.au in /pub/acdemic/

or mail us at:

[e-mail]


Briefly RF has the following functions:

Tools
        Convert between S,Y,Z and ABCD two port parameters
        Design Butterworth and Chebichev Filters
        Design and analyse coil and wire inductors
        Sophisticated Microstrip design and analysis
        Design parallel, series resonators and LC filters
        Complex/Polar calculator

Compnents
        Capacitors (includes parasitics)
        Resistors   (includes parasitics)
        Inductors   (Q included )
        Curve fitted S parameter devices and whole circuits (fit types:
                    rational, polynomial, spline, ls, linear)
        OpAmps
        Transmission Lines (ideal and lossy, open and shorted)
        Transformers (ideal and non ideal, leakage inductances and resistances)
        FETS (all parasitics)
        Tapped Inductors (Q and parasitics)
        Beta controlled current sources (all parasitics)
        VCCS
        Mutual inductors (all parasitics)
        Source and Loads
        DC source

Analysis Facilities
        Swept frequency (Full and Nodal)
        Single frequency component tolerance
        Swept frequency component tolerance
        DC bias point analysis
        Pulse analysis (Fourier simulated)

Text Output
        Transducer gain
        Linvil c stability
        Stern k stability
        Input impedance
        Output impedance
        Input admittance
        Output admittance
        Voltage gain
        S11, S12, S21, S22 S parameters
        Input reflection coefficient
        Output reflection coefficient
        Maximum transducer gain possible
        Source admittance/impedance to obtain Gtmax
        Load admittance/impedance to obtain Gtmax

Graphical Output
        Voltage Gain
        Transducer gain
        Input impedance
        Output impedance
        S11, S12, S21, S22 S parameters
        Input reflection coefficient
        Output reflection coefficient
        Pulse time trace
        Multiple "tagged" plots
        Autoscaling or manual scale
        Auto cursor tracking (warps to and displays the nearest
                              points) or absolute
        Points or line traces

---------------------------------------------------------
Name:      Academic Technologies       Bongaree Rd,
Voice/Fax: [phone]         Terranora,
Inet:      [e-mail]    NSW, AUSTRALIA 2486
----------------------------------------------------------



From [e-mail] Mon Jan 22 19:53:28 1996
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Joe Lukas )
Newsgroups: rec.radio.amateur.antenna
Subject: ANRENNA, 114' PORTABLE, WHERE TO ADVERTISE
Date: 17 Jan 1996 02:15:58 GMT
Organization: Netcom
Lines: 37
Message-ID: <4dhm4u$[e-mail]>
NNTP-Posting-Host: ix-tf5-17.ix.netcom.com
X-NETCOM-Date: Tue Jan 16  6:15:59 PM PST 1996

PORTABLE 114 ' ANTENNA MASTS


Mobile 114' antenna manufactured by TRI-EX Tower Corp. for US Military
at a cost of $193,779 ea.   The antenna is a seven section, telescoping
mast designed to support three four foot diameter dishes.  Each dish
can be in
dividually controlled in it's tilt axis. The system is powered by two
10kw diesel generators driving electric over hydraulic motors operating
cables to hoist the mast.  The unit includes hydraulic controls for the
above a
nd for stabilizers, a power distribution box and an aluminum trailer
with pintle hitch.

This unit is ideal for a government's emergency program to set up com
links in case of a natural disaster, for a large remote construction
project or unit could also be used to mount high tech video equipment
for peaking
over tree tops.

Overall Dimensions are:  352" L x 98"W x 98" H.   Total  weight is
approximately 15,600 Lbs.

NSN : 5895-01-156-0572.   Units have under 10 hours running time.

Price Ea.  $35,000 US.

Contact:

Joe Lukas
Federal Resource Corp.
2201 Barren Hill Road
Conshohocken, Pa. 19412

Ph. 610.828.3500. X 118
Fax [phone]



From [e-mail] Mon Jan 22 19:53:29 1996
Path: news.epix.net!uunet!in2.uu.net!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!gumby!newspump.wustl.edu!news.starnet.net!wupost!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Apartment Antenna Selection?
Date: Sat, 20 Jan 1996 16:12:11 GMT
Organization: Inlink
Lines: 39
Message-ID: <4dr4h8$[e-mail]>
References: <4dndam$[e-mail]>
NNTP-Posting-Host: slip30.inlink.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (GFT) wrote:

>I just moved into an apartment which obviously limits my selection of
>suitable antennas for VHF/UHF.  I primarily work 2m and 70cm and would
>like any input from others who are in a similar situation.  I want to
>use an indoor antenna and am located on the highest floor of the
>building which is about halfway up a small hill which may hamper my
>line of sight to the local repeater.

>Any help would be appreciated!

>Grant
>KF4FTL

Hi Grant

I lived in apartments for many years and found numerous ways to get
around the antenna problems.  The most unique was building a
multi-band J-Pole, 4 inches in diameter at the base and mounting it in
a terra cotta clay flower pot.  The coax was hidden inside a garden
hose and a dummy (gutted) faucet was glued to the wall for the input
to the shack.  The antenna sat right out in the open on the balcony.

If you have a tree closeby, you could also build a ribbon J-Pole and
hang it in the tree or let it hang out your window while you are on
the air.  It could also be made right on the window using copper or
aluminum foil tape.

J-Pole dimensions and plans can be found on my web-page, including
K-Factor tables for larger diameter tubing.
http://www.inlink.com/~raiar

TTUL - 73+ de Gary - KG0ZP








From [e-mail] Mon Jan 22 19:53:30 1996
Path: news.epix.net!news.sprintlink.net!cyberspace.com!imci2!newsfeed.internetmci.com!news.cfa.org!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon
From: Michael Haydon <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Continuous loaded Verticals??
Date: Sun, 14 Jan 1996 20:37:08 -0600
Organization: Olivet Nazarene University
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: tiger.olivet.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Anyone who is using a continuously loaded vertical on 160m, please send
me data!!!
Include length, wire size and winding pitch, matching network and feed
specifics, please!
 Thanks in advance.
  KF8ZN Mike



From [e-mail] Mon Jan 22 19:53:31 1996
Path: news.epix.net!uunet!in1.uu.net!news.net99.net!news.burgoyne.com!news.aros.net!usenet
From: [e-mail] (MFP - KB7YJJ)
Newsgroups: rec.radio.amateur.antenna
Subject: CQ: All HF remote base users..............
Date: 21 Jan 1996 17:32:06 GMT
Organization: ArosNet
Lines: 15
Message-ID: <4dttam$[e-mail]>
NNTP-Posting-Host: anp9.aros.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Attention all other REMOTE HF group operators:

We have to put our UHF to HF (Kenwood 690AT and HAMLINK AEA Controller)
at our rptr site......

I would be very happy to hear what antennas you guys are using...

We tried an R7 and it was noisy, BUT would snap under our icing -
windloading at our site.....

Our next bet might be a dipole...

how bought the Gap Challenger 80-6 meter antenna, any more rugged or
less-rugged than the R&!!!



From [e-mail] Mon Jan 22 19:53:32 1996
Path: news.epix.net!news.sprintlink.net!news.genesis.net!news.atlantic.net!netaxs.com!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!news.kei.com!ub!dsinc!netnews.upenn.edu!Lehigh.EDU!Lehigh.EDU!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Crossbanding antenna Dip or Duplexer?
Date: 15 Jan 1996 19:06:33 -0500
Lines: 15
Message-ID: <4deq69$[e-mail]>
NNTP-Posting-Host: ns4-1.cc.lehigh.edu

Hello, i would like to run my dual band rig crossbanding into ONE antenna
now, do i need to get one of those small duplexers for 30-40$ or
a multi hundred <or homebrew> cavitiy?

thanks
private replys would be nicer

David
|-----------------------------------------------------------------------|
|         David Roseman       |          [e-mail]       OUTTA ORDER!
|                             |          Saucon Valley Sen. HS   |      |
|      SysOp of NODE 3 BBS    |          The Flying HAm - BBS    |      |
|     Running OBV/2 Software  |          Technomage - BBS        |      |
|                             |          N3SQE/1     - HAm       V      |
|                             |  [e-mail] - Packet  |


From [e-mail] Mon Jan 22 19:53:33 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!news.sfo.com!news.zeitgeist.net!wizard.pn.com!mozo.cc.purdue.edu!purdue!ames!agate!news.mindlink.net!van-bc!news.cyberstore.ca!news
From: [e-mail] (Donovan Isaac)
Newsgroups: rec.radio.amateur.antenna
Subject: Dipole optimized for 55.25MHz and 77.25MHz
Date: Sun, 14 Jan 1996 05:13:10 GMT
Organization: Cyberstore Systems, Inc.
Lines: 47
Message-ID: <4da3mt$[e-mail]>
NNTP-Posting-Host: 204.244.77.22
X-Newsreader: Forte Free Agent 1.0.82

Yeah, I know. It's the TV Band. Specifically Ch2 and 5.

Here's my problem. I built a dipole antenna optimized for those two
channels. The first night that I had excellent reception. The next
day, let's just say that the reception was less than desirable.

The dipole antenna is made from 300ohm twin lead and is 195.2 cm long
(76.85")

The formula I used to calculate the langth of the dipole is as
follows: (Which I recieved from my communications systems professor)

   1.   Geometric Mean of the 2 carrier frequencies.
                Square_root of (55.25MHz x 77.25MHz) = 65.33MHz

   2.   Calculate the Wavelength
                WaveLgth = c / f = 4.592m (180.8")

   3.   Calculate half of the wavelength = 2.296m (90.39")

   4.   Take 85% of that value = 1.952m (76.85")

I originally suspected that the 50-ohm coax cable was at fault. (Yes,
I am using a matching transformer) Not so. I highly suspect that it is
the fault of the stucco (aka, chicken wire) apartment building that
sits between me and the transmission station on Knox Mtn. (I also live
in an apartment building)

Tonight (The next night) I could drag in BCTV but not CHBC. The
weather was cloudy. I figure that CHBC transmitts from knox mountain,
roughly NNW of me. The dipole was facing SW. I believe that it was
clear yesterday. I assume that the weather is also playing a large
factor.

Does anyone have any suggestions? Mounting the antenna higher is _not_
an option here. I would like to mount the antenna on the roof, but its
against strata rules.

I was thinking of putting up a reflector in behind and then another
one quarter wavelength antenna in front of the half wave dipole. If I
do this, would the sensitivity increase? What If I built a section
that was 1 wavelength long?

please e-mail [e-mail] and/or post here.

any help would be greatly appreciated.



From [e-mail] Mon Jan 22 19:53:34 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!news.cyberstore.ca!math.ohio-state.edu!cs.utexas.edu!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail](Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.antenna
Subject: Dipole using #26 gage wire.
Date: 15 Jan 1996 17:03:32 GMT
Organization: Netcom
Lines: 19
Message-ID: <4de1d4$[e-mail]>
References: <4da3mt$[e-mail]>
NNTP-Posting-Host: ix-pon-mi3-06.ix.netcom.com
X-NETCOM-Date: Mon Jan 15  9:03:32 AM PST 1996


Travelling alot I wanted a super light dipole for 40m. I have tried
many portable designs but prefer the dipole. I don't like using a tuner
unless nessesary and work 40m cw only. The question is how does the
gage of wire used affect the antenna?

Your comments are welcome on the following:

a.) I assume the higher gage wire would have lower velocity factor and
need to be longer.

b.) Does the higher resistance wire cause the antenna to be any sharper
or more broadband in respect to SWR?

c.) Any limits on wire size?

Thanks to all who can share something.

Tim, ka8ddz


From [e-mail] Mon Jan 22 19:53:35 1996
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!cs.utexas.edu!howland.reston.ans.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Greg Prior)
Newsgroups: rec.radio.amateur.antenna
Subject: Folded Log Periodic
Date: 17 Jan 96 06:48:53 GMT
Organization: ucsd usenet gateway
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I just ran across an article on a Log Periodic Array with a twist.  The elemen
ts
are folded into half-wave delta loops.  I found the article in the "ARRL Anten
na
Compendium", page 48 called "A Wide-Band, Low-Z Antenna - New Thoughts on Smal
l
Antennas".  There is only a sketch of the antenna, no building info.  The sket
ch
looks promising.  It covers 20-30 MHz and is 8' wide and 12' 4" long.  A 14-30
MHz Antenna would be more interesting to me.  So:

1.  Are there any other construction articles on this antenna?
2.  Has anyone built this antenna?
3.  Has anyone modeled this antenna?

I would be interested in any and all comments.

Thanks, Greg - AC6IY



From [e-mail] Mon Jan 22 19:53:36 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!xara.net!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: G5RV Reviews?
Date: 14 Jan 1996 01:55:01 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 14
Distribution: world
Message-ID: <4d9npl$[e-mail]>
References: <4cgjte$[e-mail]> <[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In an article,
Scott N0XZY <[e-mail]> wrote:

>As for sigs, made some 10m phone contacts during the recent contest,
>to a PQ station, LU... Mine is configured for east and west signals.

Hi Scott, if your antenna is the 100-105 ft class of G5RV, your
radiation pattern on 10m is not east/west. When the length of
a dipole in feet exceeds 1170/freq, the pattern is multi-lobed
with almost no broadside radiation. On 10m your pattern will
be somewhat NNE/SSE/NNW/SSW. For a 102 ft. G5RV, a cloverleaf
pattern starts at about 12 MHz.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Mon Jan 22 19:53:37 1996
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!cs.uoregon.edu!usenet.ee.pdx.edu!newsrelay.netins.net!news.netins.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Gap Antennas
Date: 17 Jan 1996 03:19:24 GMT
Organization: INS Information Services, Des Moines, IA USA
Lines: 40
Message-ID: <[e-mail]>
References: <4dfj24$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ins.netins.net

In article <4dfj24$[e-mail]>, [e-mail](Scott Hop
ta ) writes:
>Hello Everyone:
>
>I looking at purchasing a vertical antenna and was wondering if anyone
>has used any of the Gap antennas and if you can tell me how they
>perform.
>
>I saw thier add in the December QST and like the idea of no traps ...
>etc.
>
>It looks like it also has a bigger band width then other verticals.
>
>Any thoughts would be appreciated.
>
>Thanks
>
>Scott Hopta (N0NXY)
>

Scott:
I know someone will come along and roast me for any kind of support for GAP an
tennas but
I've used one for about 3 or more years. I will *briefly* tell you what my fee
lings are
on them.
I used the Challenger DX-VIII. Reason: I needed something to survive ice storm
s in Northern
Iowa, I wanted something that was multi-band, I couldn't get any kind of radia
l system up and
stay married and I didn't really have room for a dipole (which is about the be
st "simple"
antenna that I have used). In actual usage I used it running about 50% QRP@ 3
watts and
50% 100 watts. All c.w. Even when the spots were no where near as good as at t
he peak, i.e.
3 years ago, I could work UA's and other dx with 3 watts, and get 559 reports.

This was mostly on 20 and 15 meters. On 40 meters I worked okay to pretty good
. On 80 it
was terrible.
There are, to be sure, better antennas. You will need to decide what you can d
o. If you
can get a decent radial system out then I wouldn't necessarily recommend this
antenna.
IF you can get some decent wire antenna up, i.e. dipoles at good heighth, loop
s, etc.
then I'd go that way. These are not "yagi at 70 ft" that I rather have but wit
h good
operating technique they work. Oh they are kind of pricey. A large loop fed wi
th a tuner
would be about 1/8th the cost and probably more efficient.
Thats my $.02 worth.
(I am now putting on my asbestos underwear.) 8-)



From [e-mail] Mon Jan 22 19:53:38 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!in2.uu.net!fdn.fr!jussieu.fr!univ-lille1.fr!ciril.fr!news.imag.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Gap Antennas
Date: 17 Jan 1996 14:32:00 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 19
Message-ID: <4dj190$[e-mail]>
References: <4dfj24$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>I looking at purchasing a vertical antenna and was wondering if anyone
>has used any of the Gap antennas and if you can tell me how they
>perform.

Hello Scott,

It has been stated several times that all no-radial verticals
are very poor performers and that they are easily beat by a simple
dipole. Even in a recent product review over here the author admitted
that its signal was 1 - 2 S-points low compared with a simple dipole at
the same height. And this although product revievs are generally heavily
biased towards the product reviewed!

One thing is sure, that GAP's claim of 95% efficiency is a blatant lie and
that 5% would be more realistic. There are "satisfied" users of such
antennas, but OTOH it is hard to admit that an antenna is poor
if you have paid a lot for it.

73, Moritz DL5UH


From [e-mail] Mon Jan 22 19:53:39 1996
Path: news.epix.net!uunet!in2.uu.net!news.accessone.com!news
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna,rec.radio.scanner,rec.radio.shortwave,rec.radio.amateur.equipment
Subject: Ham Radio Online Magazine Has a Whole New Look!
Date: 21 Jan 1996 18:50:50 GMT
Organization: Virtual Publishing Co.
Lines: 17
Message-ID: <4du1ua$[e-mail]>
NNTP-Posting-Host: vbook.accessone.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5
Xref: news.epix.net rec.radio.amateur.misc:97084 rec.radio.amateur.policy:32629 rec.radio.amateur.digital.misc:13683 rec.radio.amateur.antenna:18566 rec.radio.scanner:44064 rec.radio.shortwave:69066 rec.radio.amateur.equipment:23910


Check out our new layout at Ham Radio Online magazine. As always, its free and

free of ads. The coolest and classiest Ham Radio site on the web. Check out th
e
new articles this week - Reviews of HF propagation prediction software, an
article on a proposal to reinstate the low power Class D commercial broadcast
FM license and much more!

We are not just pointers to cyberspace - we've got content - real stories on
everything having to do with radio telecommunications!

http://www.accessone.com/~vbook/hronline.htm

------------------------
personal email to [e-mail]
Visit Ham Radio Online, it's free, at
http://www.accessone.com/~vbook/hronline.htm



From [e-mail] Mon Jan 22 19:53:40 1996
Path: news.epix.net!news.sprintlink.net!wizard.pn.com!brighton.openmarket.com!decwrl!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Tony Natoli, 516-282-3976)
Newsgroups: rec.radio.amateur.antenna
Subject: RE: Ham-Ant Digest V96 #12
Date: 17 Jan 96 00:15:47 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

unsubssribe ham-ant


From [e-mail] Mon Jan 22 19:53:41 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.u.washington.edu!news.alt.net!news.net99.net!news.localnet.com!news2.net99.net!news.cais.net!news.sfo.com!news.zeitgeist.net!wizard.pn.com!brighton.openmarket.com!decwrl!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Tony Natoli, 516-282-3976)
Newsgroups: rec.radio.amateur.antenna
Subject: RE: Ham-Ant Digest V96 #12
Date: 17 Jan 96 00:16:18 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

unsubscribe ham-ant


From [e-mail] Mon Jan 22 19:53:42 1996
Path: news.epix.net!news.sprintlink.net!mercury.galstar.com!usenet
From: Dan Sitterley <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: HELP:What did I buy??
Date: Wed, 17 Jan 1996 20:07:14 -0800
Organization: Galaxy Star - Northeastern Oklahoma Internet
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: star159.galstar.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)

I recently purchased 5 sections of what I thought was ROHN 45 tower only
to find out that it is smaller than ROHN 45 (which has an 18" face) and
larger than ROHN 25 (which has a 12" face). This tower has a 15" face and
has the same Z bracing as ROHN. I took a section to our club meeting and
no-one had seen anything like it. I need to find a top section for it and
don't know where to start looking. I believe that the legs are 1.25" in
diameter and is made of very heavy zinc coated metal.

Any help would be appeciated.

--
Thanks,

Daniel M. Sitterley - MCNE
KA3GRJ
Tulsa, OK
[e-mail]


From [e-mail] Mon Jan 22 19:53:43 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!msunews!news.gmi.edu!zombie.ncsc.mil!nntp.coast.net!howland.reston.ans.net!newsxfer.itd.umich.edu!qiclab.scn.rain.com!gasco!nntp.teleport.com!usenet
From: Daniel Calzaretta <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Info Needed on Butternut HF9VX
Date: 21 Jan 1996 18:36:17 GMT
Organization: Pacific Crest Community School
Lines: 8
Message-ID: <4du131$[e-mail]>
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I am looking at buying the Butternut HF9VX with counterpoise.  Does
anyone have experience with this antenna?  I would appreciate any and all
comments.

Thanks,

Dan  N9BCC/7



From [e-mail] Mon Jan 22 19:53:44 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!news.worldlinx.com!news
From: "Marc J. Hemphill" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Info request on DDRR antenna
Date: Wed, 17 Jan 1996 17:14:04 -0400
Organization: WorldLinx Telecommunications Inc.
Lines: 56
Message-ID: <[e-mail]>
References: <[e-mail]>
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Bill VanRemmen wrote:
>
> I am thinking of building a DDRR antenna for 10 meters
>
> blah blah blah
>
> Does anyone have any experience with this design?  Any idea how it performs
> versus a dipole?  Is the radiation vertical or horizontally polarized?
> Any problem with putting a 2m ring inside the 10m ring?
>
> --Several years ago I built a 20 Meter DDRR that was mounted under
a truss style roof. It was a 'dipole' DDRR (ie it had both a
top and bottom ring. It was made of 1/2 copper pipe. the 'vertical'
section of the ring was about 12 or 14 inches high. the feed to
this vertical section was through 50 ohm coax from a 1:1 balun
using a delta arrangement. I didn't use a tuning capacitor at all.
Instead I varied the distance between the ends of the ring by
attaching fishing line to it and a Rube Goldberg screw driven
arm. A few inches difference 'rubbered' the tuning point across
a large portion of the band. ( can't remember if it was the whole
band or not).

The bandwidth was narrow with 3 db points of maybe 15 Khz. Can't
remember exactly but it was close to the theoretical value. That's
good for two reasons: 1) It rejects adjacent signals and broadband
noise wonderfully, 2) It must have been fairly efficient or the
BW would have been flatter due to the lower Q from the losses.

I had no problems working/hearing stations but then I don't
typically do the DX thing. Take off angle should be low if
you build the dipole version or are working against an excellent
ground. It is vertically polarized.

The Gotchas:
The whole thing has to be very low loss, after all the antenna
is effectively a foot high. Forget about versions using
using muffler pipes working against a poor ground. Might
as well get a tuner and load the bed springs.
It has to be very stable mechanically or it will go out of tune
when a mouse sneezes.
You can tune on background noise to get it close but my receiver
AGC makes that difficult. I can now disable my AGC.
A noise bridge is handy for adjusting the Delta feed. There are
a lot of variables to contend with and lot of calulating involved.

There was a 2 part article by the inventor in either Ham Radio
or 73 many years ago. All the theory and practical data is
there. He called it a Directly Driven Ring Radiator. It
was designed for military use and he won an award for it. I'll
dig into my archives and try to get the details for the mag
and issue.

Unfortunately, I moved to a new house not long after I put it
up. Because it was assembled 'around' the roof trusses, it was
disassembled with a tubing cutter and never put back into
service.


From [e-mail] Mon Jan 22 19:53:45 1996
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip22.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Info request on DDRR antenna
Date: Wed, 17 Jan 1996 20:56:01 LOCAL
Organization: Arizona Daily Star - AZSTARNET
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: usr4ip22.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <[e-mail]> "Marc J. Hemphill" <[e-mail]
net.com> writes:
>From: "Marc J. Hemphill" <[e-mail]>
>Subject: Re: Info request on DDRR antenna
>Date: Wed, 17 Jan 1996 17:14:04 -0400

[snip]

>There was a 2 part article by the inventor in either Ham Radio
>or 73 many years ago. All the theory and practical data is
>there. He called it a Directly Driven Ring Radiator. It
>was designed for military use and he won an award for it. I'll
>dig into my archives and try to get the details for the mag
>and issue.



If it will help in your search, the inventor was Joe Boyer, W6UYH.
I also have the articles somewhere, but apparently not where I remember.

73, Wes -- N7WS


From [e-mail] Mon Jan 22 19:53:46 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!news
From: [e-mail] (John Scott)
Newsgroups: rec.radio.amateur.antenna
Subject: J-Pole calculations
Date: Wed, 17 Jan 1996 19:09:23 GMT
Organization: Dell Computer Corporation
Lines: 7
Message-ID: <4djhhn$[e-mail]>
NNTP-Posting-Host: jscott.us.dell.com
X-Newsreader: Forte Free Agent 1.0.82

Does anybody know where I could get the actual calculations needed for
J-Pole design.  I am interested in playing around with different
diameters of pipe etc.

Thanks ahead of time




From [e-mail] Mon Jan 22 19:53:47 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!fury.berkshire.net!op.net!agis!frankensun.altair.com!newsserver.pixel.kodak.com!newsserver.rdcs.Kodak.COM!usenet
From: [e-mail] (Andy Jeutter)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: MFJ SWR Analyzers - Any users?
Date: Thu, 18 Jan 1996 06:33:17 GMT
Organization: Eastman Kodak Company
Lines: 36
Message-ID: <4dkpgd$[e-mail]>
References: <4dbe97$[e-mail]>
NNTP-Posting-Host: mgpc3.ag01.kodak.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Tim Smith) wrote:

>I'm thinking about buying one...any pros/con?  Does your have the internal
>resistance (aka impedance) bridge?  Is the built in counter worth it?  Any
>success/horror stories in antenna building using these?  Better than or does
>it compliment a dip meter?  Are the wide range ones (1.8-170MHz)vernier tuned

>and stable enough for handheld operation?

>Thanks,

>N1BTQ

>Tim Smith

>Email: [e-mail]
>WWW: http://www.ici.net/cust_pages/tsmith/tsmith.html
>Fax: [phone]
Tim,

the MFJ 259 consists of a resistive
Wheatstone-Bridge that is feed by a RF
osciallator. The rectified bridge voltage is shown
on the instrument. A similar design is shown in
QST December 1967 p. 39 (the R. T. Hart noise
bridge, also US Patent 3531717).
Thus you can use the MFJ 259 for all the jobs you
can use a noise bridge. Get the free manual from
MFJ to see how useful it can be for an antenna
experimenter.

Also the designer of the device is here on the
net. You can ask him if you have any specific
questions. Once he answered mine very kindly.

73 Andy, DL4SEI



From [e-mail] Mon Jan 22 19:53:48 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!cs.umd.edu!zombie.ncsc.mil!paladin.american.edu!gatech!newsfeed.internetmci.com!uwm.edu!news.inap.net!news.enteract.com!delta.misha.net!news
From: [e-mail] (Roger W Sellers)
Newsgroups: rec.radio.amateur.antenna
Subject: need APRS setup help
Date: 22 Jan 1996 04:31:04 GMT
Organization: Midwest Information Super Highway Access Group, Inc.
Lines: 9
Message-ID: <4dv3u8$[e-mail]>
NNTP-Posting-Host: dial02.misha.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

I need assistance in getting an ICOM Z1A HT configured to my Kantronics KPC-3
and laptop computer. I'm anew HAM and don't understand some of the
configuration requirements like UNPROTO. Some guys here are trying to help, bu
t
no one is yet shall we say an expert with it yet.
Thanks in advance, 73.

Roger
KB9LBU



From [e-mail] Mon Jan 22 19:53:49 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!nntp.crl.com!news.fibr.net!nntp.news.primenet.com!news.primenet.com!stanl
From: Stanley Lalli <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Need mod for GE Masterpro (repeater)
Date: 16 Jan 1996 21:48:01 -0700
Organization: Primenet Services for the Internet
Lines: 12
Sender: [e-mail]
Message-ID: <4dhv21$[e-mail]>
X-Posted-By: [e-mail]

I am looking for any mods regarding the GE Masterpro. I want to convert
one for repeater use. I know it can be done. I just can't seem to find any
schematics, diagrams, or information about this radio.  I have also heard
it is simular to the Motorola Micor.
If anyone has any info, please reply...

Thanks.
--

 \`O.o'
 =(_ _)=
    U    [e-mail]


From [e-mail] Mon Jan 22 19:53:50 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!psinntp!psinntp!psinntp!pipeline!news
From: [e-mail] (Dave Santoro)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Needed: Eggbeater Plans
Date: Tue, 16 Jan 1996 16:33:50 GMT
Organization: JRP Securities, Inc.
Lines: 12
Message-ID: <4dgk1d$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dsantoro.nyc.pipeline.com
Xref: news.epix.net rec.radio.amateur.homebrew:12784 rec.radio.amateur.antenna:18522

Am looking to homebrew an Eggbeater Antenna dor Sarex/Mir operation.
Can anyone point me to a site or file with plans?

Thanks, & 73,

_______________________________________________________________________
  David H. Santoro       |   [e-mail]    |  Amateur Radio
   Systems Analyst       | [e-mail]    |    Callsign
JRP Securities, Inc.     |    [e-mail]        |     N2VYP
-----------------------------------------------------------------------
                         *<Standard Disclaimers Apply>*



From [e-mail] Mon Jan 22 19:53:51 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Repeater Antennas
Message-ID: <[e-mail]>
From: Bill Harwood <[e-mail]>
Date: Thu, 18 Jan 1996 18:57:19 GMT
Sender: [e-mail] (NAWS news admin)
References: <4d9d67$[e-mail]>
Organization: NAWS, China Lake, CA
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[e-mail] (Adam Husik) wrote:
>
>We are currently in the planning stage of setting up a VHF repeater
>with approximately 30-50 watts. The location will be on the top of a
>house which is approximately at 300'. The house is located on one of
>the highest points in Princeton NJ, Great Rd. There are  trees in the
>area, however, I'm not sure how relevant that is due to the fact that
>we are using VHF. My question is: is there a way to calculate the
>usable range of this repeater system, given that we use a directional
>or omnidirection antenna. We don't know a lot about antennas but want
>to get the maximum range possible with the least power.
>
>Any suggestions?
>
>Adam Husik
>KB2UTP
>
>

Since you are not getting an overwhelming response, I will try.

First,  you are embarking on a journey to build a repeater so you will
do a lot of learning and make a lot of mistakes and will have to redo
many things.  Don't give up and keep plugging.  When someone tells you
how dumb you are for doing something remember they probably made the
same dumb mistake when they started.

Given that; read the repeater antenna sections of ARRL Handbook and the
ARRL Antenna Book.  For a repeater you probably want a more durrable
antenna than you might use at home.  The repeater does provide a service
to the amateur community.

1.  What kind of winds do you face?  Remember hurricanes, noreasters
and such.  The long fiberglass claimed highgain antennas from dimond and
comet don't do so well.

2.  What kind of cold weather, ice and snow loading do you face?

3.  What kind of tower mounting and how much tower space can you use up?
You are probably a guest or low cost user so mke sure you are
considerate in this area.

4.  What is your coverage area?  Is it omni directional or figure eight
or cartoid in nature.  Use an antenna or antennas which have patterns
which match the coverage area.  This maximises your signal in areas
where people are and minimises them where people arn't.  It also
minimises the conflict and overlapping with neighboring repeaters on the
same or close frequencies.  Remember you need less RF over water than
land in a coastal situation.  Also remember that very high gain
verticals tend to put lots of RF at the horrison but may have nulls
under the antenna.  ie a mobil on the horrizon may be full quieting
while a handie talkie a couple of miles away can't get into the
repeater.

All this said here are some sugggestions.  A two, four or eight bay
dipole or folded dipole set.  These tend to be durrable and can be
easily set up to optimise coverage area.  They also can be placed on
tower legs to conserve space.  Station Master Commercial verticals.
They are rugged.  If your coverage area is cartoid or hemispherical a
lazy beam may work well.  That is a two or three element beam with good
front to back characteristics but pretty poor forward directional
pattern.  Look to your local commercial two way radio shops for ideas.
They will know a lot about successful repeater installations for your
area.  Good COAX is must.  Leakey or lossy coax leads to
desensitization.  Lose RF fromr your transmitter is near your recieve
frequncy sos use 99-100% shielded transmission line such as hardline or
9913 type coax to reduce headaches.

Good Luck and don't get discouraged!!!!!

  \------------------------------------------------------/
   \  Bill Harwood           U play it, I'll dance it   /
    \ AB6DY                         or                 /
     \                      I'll play it, U dance it  /
      \----------------------------------------------/




From [e-mail] Mon Jan 22 19:53:52 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news
From: Paul Moller <[e-mail]>
Subject: Re: REPEATER ANTENNAS
Content-Type: text/plain; charset=us-ascii
Organization: MOTOROLA
Date: Thu, 18 Jan 1996 12:06:54 -0600
Message-ID: <[e-mail]>
X-Mailer: Mozilla 2.0b3 (Win95; I)
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Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 144.188.36.8
Lines: 36

It would not be fare to say that the trees do not make any difference. A
dB of loss is a dB no matter how high above average terrain it is.

Second. In this application you may want to use a high gain omni
antenna. That many times seems to be the rule, but is not always the
best choice. An example of when it is not a good choice is where you may
be limited in overall height due to mechanical or other reasons. Then
you want to use an antenna which balances getting your center of
radiation up the highest with antenna gain. In one case there was a
limit of 70ft total height. The better choice was to use a 6dB gain 7ft.
tall antenna rather than a 9dB gain 15 ft tall antenna.

As far as actual coverage predictions go, I have used the curves in the
ARRL antenna handbook for path loss and found them to be pretty good.

Lastly, everybody should have your problem of having a 300ft site!!


moncef wrote:
>
> [e-mail] (Adam Husik) writes:
> >
> > We are currently in the planning stage of setting up a VHF repeater
> > with approximately 30-50 watts. The location will be on the top of a
> > house which is approximately at 300'. The house is located on one of
> > the highest points in Princeton NJ, Great Rd. There are  trees in the
> > area, however, I'm not sure how relevant that is due to the fact that
> > we are using VHF. My question is: is there a way to calculate the
> > usable range of this repeater system, given that we use a directional
> > or omnidirection antenna. We don't know a lot about antennas but want
> > to get the maximum range possible with the least power.
> >
> > Any suggestions?
> >
> > Adam Husik
> > KB2UTP


From [e-mail] Mon Jan 22 19:53:54 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: RFI from ladderline?
Date: Tue, 16 Jan 96 22:32:24 est
Organization: PSI Public Usenet Link
Lines: 57
Message-ID: <[e-mail]>
References: <4d1c51$[e-mail]>
NNTP-Posting-Host: 38.12.1.169
Mime-Version: 1.0
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X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In Article<4d1c51$[e-mail]>, <[e-mail]> writ
e:
> Path: interramp.com!interramp.com!psinntp!psinntp!howland.reston.ans.net!gat
ech!newsfeed.internetmci.com!news.msfc.nasa.gov!sol.ctr.columbia.edu!news.ober
lin.edu!ocvaxa.cc.oberlin.edu!PRUTH
> From: [e-mail]
> Newsgroups: rec.radio.amateur.antenna
> Subject: RFI from ladderline?
> Date: 10 Jan 1996 21:47:13 GMT
> Organization: Oberlin College, Oberlin, Ohio
> Lines: 13
> Message-ID: <4d1c51$[e-mail]>
> Reply-To: [e-mail]
> NNTP-Posting-Host: alpha.cc.oberlin.edu
>
> I'm thinking of going to a ladder-line-fed dipole instead of my
> coax-fed trap dipole to cut my losses in the coax from the
> high SWRs of nonresonant antenna.  While I have no problems using
> the trap dipole, being able to tune it EVERYWHERE, including 160m,
> I think I might get more rf to the radiator using ladder line.
> A fellow ham advised me against using ladder line, saying it
> produces a lot of RFI.  Is this true?  If so, would a current
> balun at the feedpoint eliminate this alleged RFI?  I'm using a
> 50' run of RG8U coax to the trap dipole, by the way, which I'm
> wondering might be just fine, and that I might be making
> unnecessary work for myself, and that the losses now might not
> be as bad as I might think.  Thanks for your collective wisdom.
> --Bill KB8USZ [e-mail]
Use the ladder line.

Here is my experience.  Licensed since 1958, I have tried it all but
I never used ladder line because of all the propaganda about how you have
to keep it away from metal, run it straight, etc., etc.

In Oct 93 I moved into 1.5 acre lot with 70' trees all over.  Only clear
area is the house and a 100 x 150 foot area for septic drain field.  I put up
135 feet of wire feed in center with ladder line.  My shack is in the
basement.
I drilled a 3/8" hole through the concrete block wall of the basement and
enlarged it with a chisel so the ladder ine runs through it.  Stuffed
some insulation around it to keep out the wind and the critters.  The ladder
line runs up the side of the house (aluminum siding) across the roof, the
straight up to the center of the antenna.  The only precaution I took was to
mount a piece of pressure treated 2 x 2 on the deck to hold the lineout from
the house siding.  I feed it through a MFJ-989C (their big tuner).
It works like a champ.  I do a lot of QRP work and I work anything I hear and
I hear a lot.  My only regret is that I did not go to ladder line
38 years ago.  Right now, the ladder line is buried in two feet of snow on the

roof.  That just makes the tuner tune a little different.  I just worked
a 9G, a 6V, and a FN on 80 meter CW running 3 watts.
Call the guy at Radio Works in Chesapeake, VA.  Get him to send you the
ready-made all-band antenna, 135 foot of wire with 100 feet of ladder line.
Also, order a line-lock.  It's a neat plastic device that clamps onto the line

and the wire.  Problem with ladder line is that, because of twisting i the
wind, it will break at the soldered connection about once a year.  The ladder
lock prevents that.  Get a couple of 200 foot lengths of nylon rope and start
pulling it up.  The higher the better.  Keep everything straight.




From [e-mail] Mon Jan 22 19:53:55 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!inet.d48.lilly.com!evax01.d51.lilly.com!ga19989
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Rhombics at Low Heights?
Message-ID: <[e-mail]>
From: [e-mail]
Date: 18 Jan 96 12:27:57 EST
References: <4dkpo5$[e-mail]>
Distribution: world
Nntp-Posting-Host: evax01.d51.lilly.com
Lines: 24



In article <4dkpo5$[e-mail]>, Bill Kleronomos <[e-mail]>
writes:
> So, to summarize my REAL question! At an elevation of 50
or 60 feet, how  well might a one to two
> wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or
160 meters? Would
> ground losses and reflections negate the benefits of using
this type of antenna at a low height in
> terms of wavelength? Anyone tried same?
>
> Bill, KD0HG
> Lyons, Colo.

It's been decades (really) since I had a long wire, but (according to the ARRL
antenna books of the day) a long wire or rhombic is not as sensitive to
elevation as dipoles ... in fact, I was running a 250 footer at 25' with some
pretty fair results.... the books were a little vague as to long wire and
rhombic performance on 80 and 160, but I'd guess if there was space, give it a
try.... be sure to point it where you want the signal to go, as it sure won't
be omnidirectional....

mel  KJ9C


From [e-mail] Mon Jan 22 19:53:57 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!hookup!gatech!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!news-2.csn.net!usenet
From: Bill Kleronomos <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Rhombics at Low Heights?
Date: 18 Jan 1996 06:35:49 GMT
Organization: Supernet, Inc.
Lines: 19
Message-ID: <4dkpo5$[e-mail]>
NNTP-Posting-Host: 199.117.100.5
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

On the lower frequencies such as on 80 and 160, very low horizontally polarize
d antennas work
pretty poorly, even at relatively close distances where they ought to have a f
air high angle of
radiation-- Moxon's RSGB antenna book suggests that this is due to the earth a
cting as a good
lossy attenuator for an antenna in close proximity....The extreme case of this
 being a dipole
lying on the ground.

I'm looking for any insight as to whether a reasonably low long-wire antenna o
r a variant
(vee-beam, rhombic) would suffer from  the effects of lossy earth as much as a
 simple dipole. In
this case, the extreme example might be how well a Beverage might work out in
transmitting, but
I'm thinking in terms of 50 feet elevation or so.

So, to summarize my REAL question! At an elevation of 50 or 60 feet, how  well
 might a one to two
wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 16
0 meters? Would
ground losses and reflections negate the benefits of using this type of antenn
a at a low height in
terms of wavelength? Anyone tried same?

Bill, KD0HG
Lyons, Colo.



From [e-mail] Mon Jan 22 19:53:58 1996
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From: Bill Kleronomos <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Rhombics at Low Heights?
Date: 18 Jan 1996 06:35:22 GMT
Organization: Supernet, Inc.
Lines: 19
Message-ID: <4dkpnb$[e-mail]>
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On the lower frequencies such as on 80 and 160, very low horizontally polarize
d antennas work
pretty poorly, even at relatively close distances where they ought to have a f
air high angle of
radiation-- Moxon's RSGB antenna book suggests that this is due to the earth a
cting as a good
lossy attenuator for an antenna in close proximity....The extreme case of this
 being a dipole
lying on the ground.

I'm looking for any insight as to whether a reasonably low long-wire antenna o
r a variant
(vee-beam, rhombic) would suffer from  the effects of lossy earth as much as a
 simple dipole. In
this case, the extreme example might be how well a Beverage might work out in
transmitting, but
I'm thinking in terms of 50 feet elevation or so.

So, to summarize my REAL question! At an elevation of 50 or 60 feet, how  well
 might a one to two
wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 16
0 meters? Would
ground losses and reflections negate the benefits of using this type of antenn
a at a low height in
terms of wavelength? Anyone tried same?

Bill, KD0HG
Lyons, Colo.



From [e-mail] Mon Jan 22 19:53:59 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Rhombics at Low Heights?
Date: 18 Jan 1996 09:30:58 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 42
Sender: [e-mail]
Message-ID: <4dllj2$[e-mail]>
References: <4dkpo5$[e-mail]>
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X-Newsreader: AOL Offline Reader

In article <4dkpo5$[e-mail]>, Bill Kleronomos <[e-mail]>
writes:

>
>On the lower frequencies such as on 80 and 160, very low horizontally
>polarized antennas work pretty poorly, even at relatively close distances
where they >ought to have a fair high angle of radiation-- Moxon's RSGB
antenna book suggests >that this is due to the earth acting as a good
lossy attenuator for an antenna in close >proximity....The extreme case of
this being a dipole lying on the ground.
>
>I'm looking for any insight as to whether a reasonably low long-wire
antenna
>or a variant (vee-beam, rhombic) would suffer from  the effects of lossy
earth as much >as a simple dipole. In this case, the extreme example might
be how well a Beverage >might work out in transmitting, but I'm thinking
in terms of 50 feet elevation or so.
>
>So, to summarize my REAL question! At an elevation of 50 or 60 feet, how
>well might a one to two wavelength per leg rhombic or vee-beam be
expected to >perform on 80 oand/or 160 meters? Would ground losses and
reflections negate the >benefits of using this type of antenna at a low
height in terms of wavelength? Anyone >tried same?

Hi Bill,

Data from others and my own experience confirms what you read in Moxon's
article. In a Beverage seven feet above earth, I measured 6 dB of current
loss at a distance of ~1 wavelength from the fedpoint. That indicates
adding wire would make little or no improvement in performance.

John Kueclin published data on V's and Rhombic taken from actual field
tests. His data indicated LW antennas need to be 1/3 of their length above
ground to minimize losses. Antennas longer than 3.3-3.9 wl (when 1.1-1.3
wl high) actually had a slight gain decrease in gain.

Very long low wires do radiate on 160. When I compared 500 foot longwires
at 100 feet to a 1/4 wl vertical on 160 the vertical always won. On 80 the
longwire was a bit better (in the favored direction) than a vertical, but
barely better. They were much better for receiving, just not transmitting.

73 Tom


From [e-mail] Mon Jan 22 19:54:00 1996
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Rhombics at Low Heights?
Date: 19 Jan 1996 00:27:07 GMT
Organization: Hewlett-Packard
Lines: 27
Message-ID: <4dmogr$[e-mail]>
References: <4dkpnb$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4dkpnb$[e-mail]>,
Bill Kleronomos  <[e-mail]> wrote:
>On the lower frequencies such as on 80 and 160, very low horizontally polariz
ed antennas work
>pretty poorly, even at relatively close distances where they ought to have a
fair high angle of
>
>So, to summarize my REAL question! At an elevation of 50 or 60 feet, how  wel
l might a one to two
>wavelength per leg rhombic or vee-beam be expected to perform on 80 oand/or 1
60 meters? Would
>ground losses and reflections negate the benefits of using this type of anten
na at a low height in
>terms of wavelength? Anyone tried same?
>
>Bill, KD0HG
>Lyons, Colo.

FWIW:  I used to have a full sized (130 feet long) 80 meter dipole at 55 feet.
For distances up to 1000 miles, it was outstanding.  Transmitting from Norther
n
Calif., I would often be told I was the loudest signal on the band in Southern
 Calif. or
VE7, etc.  For DX, it wasn't worth a tinker's damn.  I was just barely able
to work JA's on CW running a KW.  I also put up a quarter wave vertical with
2 elevated quarter wave radials.  Listening to DX signals, the two antennas we
re
virtually identical.  However, the vertical was 10 to 15 dB. down vs the dipol
e
on the 1000 mile paths where I had gotten great reports on the dipole.

I don't claim any great insight in antenna theory here; I am just relating
my experiences.  BTW, the dipole was end fed as a Zepp, but that's another dis
cussion.

Rick Karlquist N6RK
[e-mail]


From [e-mail] Mon Jan 22 19:54:01 1996
Path: news.epix.net!news.sprintlink.net!sparky.midwest.net!usenet
From: [e-mail] (Marty Albert)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Source of Al tubing?
Date: Thu, 18 Jan 1996 05:36:27 GMT
Organization: Midwest Internet
Lines: 16
Message-ID: <4dkm3v$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: dial4-27.midwest.net
X-Newsreader: Forte Free Agent 1.0.82

fiz <[e-mail]> wrote:

>Hi,

>I'm looking for a source of Al tubing to build some antennas. Any
>suggestions?

>ttfn fiz (KG0YG)

Texas Towers in Plano, TX sells AL tube in many sizes. See details in
QST/CQ/73 mags.


Marty Albert (Amatuer Radio Station KC6UFM)
Fredericktown, MO USA



From [e-mail] Mon Jan 22 19:54:02 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!ns.etri.re.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Tue, 16 Jan 96 21:51:25 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 13
Message-ID: <[e-mail]>
References: <4d2h90$[e-mail]> <4d5cv9$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: bos1b.delphi.com
X-To: <[e-mail]>

<[e-mail]> writes:

>it exactly...... and Cecil, you must be the only one in the world that didn't
>catch that the "perfect circle" was a JOKE!!!!!!Go the the newstand ang get

Hi again Armond, there are at least three people who even thought my
posting was serious. Hope to teach Sterba a lesson with that one. Some
young, vulnerable, naive people don't know when he's kidding. What I
did was assume the persona of Sterba and blasted Sterba just like
Sterba would have. What goes around comes around. And Armond, an EDZ
*is* a dipole - ask W7EL. :-)

73, Cecil, KG7BK, OOTC


From [e-mail] Mon Jan 22 19:54:03 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 17 Jan 1996 10:40:46 GMT
Organization: ELNEC/EZNEC Software
Lines: 19
Message-ID: <4dijne$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-pdx01-34.teleport.com

;   Cecil Moore <[e-mail]> writes:
;  <[e-mail]> writes:

;  >      doubling the power raises three dB. Well, one must raise the
;  >      voltage by six times to gain three dB."
;  >

;  Wonder what kind of calculator Sterba uses. Mine says if v2/v1=6 then
;  that's almost 16 dB.

;  73, Cecil, KG7BK, OOTC


He must have meant Sterbys, not dB. At 6 dB per Sterby, a voltage ratio
of 6 is 2.59 Sterbys (Sterbies?), or 3 in round numbers. We all make
mistakes.

Roy Lewallen, W7EL, OF



From [e-mail] Mon Jan 22 19:54:04 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Mon, 15 Jan 96 23:53:18 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 12
Message-ID: <[e-mail]>
References: <4d2h90$[e-mail]> <4d5cv9$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: bos1b.delphi.com
X-To: Cecil Moore <[e-mail]>

Cecil Moore <[e-mail]> writes:

>hangs on two thirty foot supports like my 88 ft dipole. He hasn't come up

Cecil: so you are back to thumping that drum again, huh, Ask W7EL and he will
explain this to you. Your "dipole"is NOT a dipole. A dipole is two poles.
 :di" state and are creating
more "poles" Your antenna has moved beyond that of a dipole , it is an EDZ or
something. I threw away the message that was a relay to you so can not quote
it exactly...... and Cecil, you must be the only one in the world that didn't
catch that the "perfect circle" was a JOKE!!!!!!Go the the newstand ang get
a copy of MAD magazine....pay someone to explain the gags to you.


From [e-mail] Mon Jan 22 19:54:05 1996
Path: news.epix.net!uunet!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 21 Jan 1996 18:06:34 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 22
Distribution: world
Message-ID: <4dtvba$[e-mail]>
References: <[e-mail]> <4do8h9$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In article <4do8h9$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:
>
>Definition's I found indicate your dipole ANTENNA is a dipole ANTENNA on
>every band where the antenna is "primarily" a broadside radiator. But the
>def excludes that name where the antenna goes into a non-broadside primary
>pattern mode.

So my 88ft EDZ centerfed *is* a "dipole" on 20m because of the two
broadside major nodes but not a "dipole" on 17m where it has a
4-lobbed clover-leaf pattern?

The confusing part for me is during receive. The antenna doesn't
know what frequency the receiver is tuned to or even if the
receiver is powered up or not. How does it know whether to be
a dipole or not during non-transmitting times? If I'm not home
and you drive by my house, would you say I had a dipole or not?
I can buy how using it during transmit can change its definition.
I have trouble accepting that thinking about it can change its
definition. If only that worked with girlfriends. :-)

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Mon Jan 22 19:54:06 1996
Path: news.epix.net!news.sprintlink.net!news.ICSI.Net!news
From: [e-mail] (Ken Jones & Martha McLemore)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: tower install options?
Date: Thu, 18 Jan 1996 02:53:00 GMT
Organization: McLemore/Jones, Hanover PA USA Tel/Fax:[phone]
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 205.231.169.55
X-Newsreader: Forte Agent .99c/16.141

Once upon a time, [e-mail] (Chris Terwilliger) wrote:

>I am thinking about installing a tower and wonder if the following idea has
>any serious flaws...
<<snip-o-rama>>
>Is this structurally sound?
>
>73
>Chris Terwilliger, AA7WD
>[e-mail]

I think you'll find that Rohn's tilt-over base is built on this
idea. Ask fer a catalog.  They have some good engineering ideas.


Cheers,

Ken Jones ([e-mail]) [Amateur Radio callsign KB3JA]
McLemore/Jones -- Hanover PA USA Tel/Fax [phone]


From [e-mail] Mon Jan 22 19:54:07 1996
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From: [e-mail] (n4jvp)
Newsgroups: rec.radio.amateur.antenna
Subject: VK parasol in 73 Magazine(Oct 83)
Date: Tue, 16 Jan 1996 17:21:21 GMT
Organization: Netcom
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: ix-nas-nh1-02.ix.netcom.com
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X-Newsreader: Forte Agent .99c/16.141

I am looking for a copy of the October 1983 issue of 73 Magazine. This
issue had an article on constructing a VK parasol, an inexpensive 2
element wire beam. I have built several versions of this antenna but
in my travels I have misplaced/lost that issue.
I would like to build another but I need the fomulae from the article.
I am looking for either a copy of that issue or a photocopy of the
article.
73 de N4JVP/NH


From [e-mail] Mon Jan 22 19:54:08 1996
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!van-bc!news.mindlink.net!news
From: [e-mail] (jim pestell)
Newsgroups: rec.radio.amateur.antenna
Subject: wefax stations
Date: Tue, 16 Jan 1996 09:20:24 GMT
Organization: MIND LINK! - British Columbia, Canada
Lines: 6
Message-ID: <4dfqmo$[e-mail]>
NNTP-Posting-Host: line045.nwm.mindlink.net
X-Newsreader: Forte Free Agent 1.0.82

Just wondering if anyone knows of any good wefax stations and where to
find them?
Also other things that can be see with a fax program?
thanks.




From [e-mail] Mon Jan 22 19:54:09 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news.cac.psu.edu!usenet
From: John Passaneau <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: what is the theory behind the R-
Date: Thu, 18 Jan 1996 08:18:04 -0800
Organization: Penn State University
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References: <4dkngk$[e-mail]>
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Peter Shintani wrote:
>
> Help
>         I would like to find out more of the theory of how the R-5 and R-7 a
ntennas work.
> I understand that they are half wave antennas, so that the input impedance i
s
> very high, so I assume that there is a 1:x ratio unun plus perhaps a balun
> inside the black box. Ie, use a 1:4 or so unun to bring the input impedance
of the
> vertical+ radials acting as a vertical windom
> down to 50  or so ohms, then use a balun to feed the coax. Is that correct ?
>
>         Any technical info would be appreciated.
> VE7CQA in JA land

I talked to one of the guys that designed that antenna a Datyon
Hamvention one year. He told me that they made the antenna slightly
shorter than a 1/2 wave. This was to lower the impedance just a bit to
make it easier to match. In the Black box is a matching unit to bring
the impedace down to 50 ohms. This is followed by a 1 to 1 balun to
prevent feedline radation. Its mostly straight foward stuff.
John Passaneau, WB8EIY, State College Pa.


From [e-mail] Mon Jan 22 19:54:10 1996
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From: Peter Shintani <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: what is the theory behind the R-
Date: 18 Jan 1996 05:57:40 GMT
Organization: Sony Japan
Lines: 12
Message-ID: <4dkngk$[e-mail]>
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X-URL: news:rec.radio.amateur.antenna

Help
        I would like to find out more of the theory of how the R-5 and R-7 antennas w
ork.
I understand that they are half wave antennas, so that the input impedance is
very high, so I assume that there is a 1:x ratio unun plus perhaps a balun
inside the black box. Ie, use a 1:4 or so unun to bring the input impedance of
 the
vertical+ radials acting as a vertical windom
down to 50  or so ohms, then use a balun to feed the coax. Is that correct ?

        Any technical info would be appreciated.
VE7CQA in JA land




From [e-mail] Mon Jan 22 19:54:11 1996
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: Listserv@ucsd (Mailing List Processor)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: your LISTSERV request "help  with beverage antenna made from slinkies"
Date: 15 Jan 96 23:13:27 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

The mailing list "with" could not be found.
You may use the INDEX command to get a listing
of available mailing lists.


From [e-mail] Mon Jan 22 19:54:12 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!news.sol.net!daily-planet.execpc.com!earth!whiteboy
From: [e-mail] (Ryan Dunham)
Newsgroups: rec.radio.amateur.antenna
Subject: ~~~~ WHAT IS THE BEST GROUNDING SYSTEM? ~~~~
Date: 19 Jan 1996 19:53:57 GMT
Organization: Exec-PC
Lines: 5
Message-ID: <4dossl$[e-mail]>
NNTP-Posting-Host: earth.execpc.com
X-Newsreader: TIN [version 1.2 PL2]

I have a 3 ft tripod and a 5 ft mast on that and a antron99 on that and
its on my roof, what is a cheap but effective way to ground it?
E-mail me
thanks



From [e-mail] Fri Jan 26 13:39:21 1996
Path: news.epix.net!uunet!in2.uu.net!news.texoma.com!usenet
From: Gary Stone <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc.,rec.radio.amateur.homebrew.
Subject: 72 ohm twin lead ??
Date: 21 Jan 1996 22:17:10 GMT
Organization: Internet Texoma, Inc.
Lines: 23
Message-ID: <4due16$[e-mail]>
NNTP-Posting-Host: ppp109.texoma.com
Mime-Version: 1.0
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X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Greetings,

My brother-n-law (KI7XQ) is trying to locate a source for a few feet of
72 ohm twin lead for an antenna project.  I am not sure of the details of
the project, but I believe he needs only about 3 feet.  He is making a
balun from the twin lead and the plans call for 72 ohm.

Any ideas?  Please e-mail with any response, as I cannot always have
access to the usenets.  Thanks and 73,

Gary (N5PHT)



--

       /\__/\        Gary and Karen Stone (Gary N5PHT)
        0  0         E-Mail:  [e-mail]
         @               or    [e-mail]
       (_/\_)        Http://home.texoma.com/personal/garystone/
         ~~




From [e-mail] Fri Jan 26 13:39:22 1996
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!gw2.att.com!gw1.att.com!csn!ub!news.kei.com!newsfeed.internetmci.com!swrinde!news.uh.edu!lurch.sccsi.com!news.sccsi.com!tattoo.sccsi.com!nuchat!ganymede
From: [e-mail] (Greg R. Broderick)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc.,rec.radio.amateur.homebrew.
Subject: Re: 72 ohm twin lead ??
Date: Mon, 22 Jan 96 05:53:35 GMT
Organization: The UseNet global cabal
Lines: 25
Message-ID: <4dv8ov$[e-mail]>
References: <4due16$[e-mail]>
NNTP-Posting-Host: tty25.com2.houston.net
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <4due16$[e-mail]>,
   Gary Stone <[e-mail]> wrote:
>Greetings,
>
>My brother-n-law (KI7XQ) is trying to locate a source for a few feet of
>72 ohm twin lead for an antenna project.  I am not sure of the details of
>the project, but I believe he needs only about 3 feet.  He is making a
>balun from the twin lead and the plans call for 72 ohm.

Somebody please correct me if I'm incorrect, but I believe that zip cord
has a characteristic impedance of 72 ohms.

[posted and emailed]

Greg R. Broderick (no call sign yet)

--
============================================================================
Greg R. Broderick        And it came to pass that in the hands of the
                         ignorant, the words of the Bible were used to beat
                         plowshares into swords.
[e-mail]                                                  -- Alan Watts
[e-mail]
[e-mail]
============================================================================


From [e-mail] Fri Jan 26 13:39:23 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news2.acs.oakland.edu!newshub.gmr.com!news.delcoelect.com!usenet
From: Tom Pfaffenbach <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc.,rec.radio.amateur.homebrew.
Subject: Re: 72 ohm twin lead ??
Date: 24 Jan 1996 18:26:40 GMT
Organization: Delco Electronics
Lines: 9
Distribution: usa
Message-ID: <4e5tl0$[e-mail]>
References: <4due16$[e-mail]> <4dv8ov$[e-mail]>
NNTP-Posting-Host: koprpc05.delcoelect.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.1 (Windows; I; 16bit)
To: [e-mail]

I tested several brands of zip cord recently with a Tektronix time-domain refl
ectometer. I
started with some really nice looking clear insulation oxygen-free copper spea
ker cord that
Sam's Club was selling for $8.50/100ft. My thought was to run balanced feed fr
om a toroid balun
and keep the balun accessible, rather than 60ft in the air. All brands measure
d between 100 and
123 ohms. Apparently modern diameters and line spacing have made the 72 ohm ru
le of thumb
obsolete!

73 K9JDU



From [e-mail] Fri Jan 26 13:39:24 1996
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!newsserv.freeway.net!dave
From: [e-mail] (Dave Wright)
Newsgroups: rec.radio.amateur.antenna
Subject: 88 ft dipole antenna.  Was: Re: Sterba again
Date: 21 Jan 1996 05:17:23 GMT
Organization: "Freeway (TM) - America's Public Information Network"
Lines: 23
Message-ID: <4dsi93$[e-mail]>
References: <4d2h90$[e-mail]> <4d5cv9$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: onramp.freeway.net
X-Newsreader: NN version 6.5.0 #9 (NOV)

[e-mail] writes:

>Cecil Moore <[e-mail]> writes:
>
>>hangs on two thirty foot supports like my 88 ft dipole. He hasn't come up
>
>Cecil: so you are back to thumping that drum again, huh, Ask W7EL and he will
>explain this to you. Your "dipole"is NOT a dipole. A dipole is two poles.
> :di" state and are creating
>more "poles" Your antenna has moved beyond that of a dipole , it is an EDZ or
>something. I threw away the message that was a relay to you so can not quote

An "88 ft dipole" is a correct discription of Cecil's antenna.  It describes t
he
physical properties; two 44 ft conductors with a center feed point.  Armond, i
f
you said that you had a "5/2 wavelength dipole" then that would not be correct

because you are then describing the electrial properties, not physical.

Armond, is my 120 ft, 80m monopole a dipole?  hmmmmmm

dave
--
david wright - n8it
[e-mail]


From [e-mail] Fri Jan 26 13:39:25 1996
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!news.columbia.edu!sol.ctr.columbia.edu!spool.mu.edu!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!usenet
From: [e-mail] (Thilo Kootz)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ?impedance of longwire?
Date: Tue, 23 Jan 1996 17:13:23 GMT
Organization: Regional Computing Center, University of Cologne
Lines: 15
Message-ID: <4e34va$[e-mail]>
References: <4dg7m7$[e-mail]> <4dqdho$[e-mail]>
NNTP-Posting-Host: annexr2-6.slip.uni-koeln.de
X-Newsreader: Forte Free Agent 1.0.82

[e-mail](Jim Stubstad ) wrote:


Thanks for the advice, jim, however thats what i knew allready. I was
interested in HOW (!!!) high the capacitance would be. thats what they
do not say in the books! what about the real parts ? are they low ?
and if how low ? 1 ohm,  five or 1000? what changes if fed in the
middle ?
I have done exactly as you proposed and fed it allright, but it would
be necessary to predict the behavier in advance to setting the thing
up.
if you can provide more details, i would be thankfull
73 thilo dl9kce




From [e-mail] Fri Jan 26 13:39:26 1996
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.monmouth.com!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!usenet
From: [e-mail] (Thilo Kootz)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ?impedance of longwire?
Date: Thu, 25 Jan 1996 01:04:39 GMT
Organization: Regional Computing Center, University of Cologne
Lines: 5
Message-ID: <4e6ktc$[e-mail]>
References: <4dg7m7$[e-mail]> <4dqdho$[e-mail]> <4e34va$[e-mail]>
NNTP-Posting-Host: annexr2-9.slip.uni-koeln.de
X-Newsreader: Forte Free Agent 1.0.82

Thanks to all who helped me.
Question was answerd sufficiently.
73 thilo




From [e-mail] Fri Jan 26 13:39:27 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!natinst.com!news-relay.us.dell.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.antenna
Subject: angle of ground plane radials????
Date: 23 Jan 96 13:38:00 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]



[e-mail] (Charlie Fortner) wrote:

>I've seen plans for 2m using a SO-239 and some copper rods.  The
>instructions say to bend the rods at a 45 degree angle towards the
>ground.  I've seen commercially made 2m antennas that don't have bent
>radials.  What does the angle  of the radials do for the signal?

The feedpoint impedance of a groundplane with horizontal
radials is around 36 ohms.  In order to get an impedance of 50
ohms you need to bend the radials down about 45 degrees.  This
reduces the capacitive reactance a bit.  If you need to have the
radials at horizontal you can compensate for this be reducing
the length of the radiator by about 5 percent.  This has the same
effect of reducing the capacitive reactance a bit.

Kevin, WB5RUE
[e-mail]


From [e-mail] Fri Jan 26 13:39:28 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!news.umbc.edu!haven.umd.edu!ames!lll-winken.llnl.gov!sol.ctr.columbia.edu!news.mindlink.net!uniserve!usenet
From: Jeff <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: apartment Ant.
Date: 20 Jan 1996 23:22:30 GMT
Organization: UNIServe Online
Lines: 4
Distribution: world
Message-ID: <4drtfm$[e-mail]>
NNTP-Posting-Host: van0119.tvs.net

I know a ham in Ontario Canada that has been using an Antron 99
antenna laying horizontal on his balcony. It works great. He
talks all over the world with it. But it won`t help on the
lower bands. The Antron is good from 14 through 28 megs.


From [e-mail] Fri Jan 26 13:39:29 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!sierra.net!imci3!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!ames!waikato!auckland.ac.nz!news
From: Mitchell Rodda <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Best HF Vertical Antenna?
Date: 24 Jan 1996 23:35:07 GMT
Organization: School of Engineering, University of Auckland
Lines: 23
Message-ID: <4e6fnb$[e-mail]>
NNTP-Posting-Host: ead-64-33.ead.auckland.ac.nz
Mime-Version: 1.0
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X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]


Hi Folks,

The amateur radio club here at the university is thinking of putting up a
vertical HF antenna.

We were wondering what the best brands were and if any one model or
brand was particularly (un)effective or easy (hard) to tune. Ideally we
want coverage of all bands from 80-10m though 80 could be sacrificed if
necessary.

We hear a lot about the G5RV design - what is it? Are they available in
commercial kits? Any info appreciated.

If you have an HF vertical please let me know your experiences with it -
ewven if only briefly.

T.I.A.,
Mitchell Rodda (ZL1BAT or [e-mail])

Secretary - Auckland University Amateur Radio Club.




From [e-mail] Fri Jan 26 13:39:30 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!usenet
From: Joe Fitter   BV/N0IAT <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna
Subject: Re: CB to Ham Transformation.
Date: 26 Jan 1996 06:23:08 GMT
Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C.
Lines: 22
Message-ID: <4e9s0c$[e-mail]>
References: <4e8bj0$[e-mail]> <4e8nji$[e-mail]> <4e9rsj$[e-mail]>
NNTP-Posting-Host: 137.167.36.115
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Xref: news.epix.net rec.radio.amateur.misc:97248 rec.radio.amateur.antenna:18657



Anyone out here in Rec.Radio land able to help Alex?  How about anyone
in the NYC area?  Please email to the below address, not the one in
the top of this message (it was posted elsewhere).

Thanks in advance to any elmer who helps.  Joe

----------------------------------------
[e-mail] (Alex948739) wrote:
The reason I did not get my licence is because I am only 15. When I have
time to study and learn stuff, I will get a licence. I was wondering, can
you transform portable CB radio that I have from GE to Ham? How did you
transformed it?Is it a good ham or a bad ham? Also, on cb since i live in
NY i hear alot of spanish itallian people speaking in other languages on
most channels and there is alot of profanity. I am wondering is there
anythink like that on HAm? Please send me plans on how to transform.
                                                               Thank You
------------------------------------------





From [e-mail] Fri Jan 26 13:39:31 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!in2.uu.net!news.ultranet.com!bigboote.WPI.EDU!news3.near.net!news.ner.bbnplanet.net!llnews.ll.mit.edu!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Cell phone antenna plans?
Date: Thu, 18 Jan 1996 10:40:18
Organization: MIT Lincoln Laboratory
Lines: 22
Message-ID: <[e-mail]>
References: <4d9ms3$[e-mail]>
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

>Can anyone tell me how to build an high-gain cellular telephone antenna
>for my cabin, that will allow me to have reliable communications in a
>very marginal service area?  Right now, I am getting less than one bar
>(of a possible four) on my car-mounted antenna.  With such a poor signal
>I can't get voice calls out very well, let-alone fax/data modem calls.

>Please e-mail if you know/are willing to offer advice.


Jeffrey,

You might look at the article "Portable Helix for 435 MHz," in ARRL Antenna
Book  (16th edition, p. 19-30).  You'd want to scale most dimensions down by
 a factor of about  2, for the antenna to operate properly at cellular
frequencies.  Although this antenna provides circular polarization rather
than linear vertical, I think you'd find it fairly forgiving to precision of
construction.  My guess that a good antenna that's pointed correctly at the
nearest cellular tower will indeed allow you to work when you should be
relaxing!

John Taylor, V73JT
Kwajalein Atoll


From [e-mail] Fri Jan 26 13:39:32 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!newshost.comco.com!news.tamu.edu!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: CQ: All HF remote base users..............
Date: 23 Jan 1996 05:26:39 GMT
Organization: Texas A&M University, College Station, TX
Lines: 39
Message-ID: <4e1rif$[e-mail]>
References: <4dttam$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 128.194.44.219
X-Newsreader: IBM NewsReader/2 v1.2

In <4dttam$[e-mail]>, [e-mail] (MFP - KB7YJJ) writes:
>Attention all other REMOTE HF group operators:
>
>We have to put our UHF to HF (Kenwood 690AT and HAMLINK AEA Controller)
>at our rptr site......
>
>I would be very happy to hear what antennas you guys are using...
>
>We tried an R7 and it was noisy, BUT would snap under our icing -
>windloading at our site.....
>
>Our next bet might be a dipole...
>
>how bought the Gap Challenger 80-6 meter antenna, any more rugged or
>less-rugged than the R&!!!
>

Probably the most reliable single pole multiband vertical antenna is the old
and expensive Hy-Gain - AVQ deal.  It is a stub segment multi-band job that
goes in a nice safe block of concrete.  It has a feed line at the base that ca
n
take advantage of a nice safe set of radials at ground level to be used for a
really needed lightning p[rotection scheme.  Your feed line goes away from it,
assuming you are smart, at or below ground level.  It will come away from the
tower into a nice safe single point entry into the remote base hut, if you are

also smart.  At about 60 feet hight it is no stick it in the ground and jump
start the pony deal, but, the years will go by.  You rig will be as safe as
you could ask, assuming the proper lightning protection has been done at the
hut end and you will be thankful you didn't try a loading coil version of
anything.

If you are lucky, you may be even able to go up to the top of it with a neat
little 440 beam towar the direction of an RF control link ito the site and,
with a little padding of the feed to the tower and the feed line inside the
deal, get your link up high enough to be line of site to the control point.

Mike W5WQN as a guest at leviathan.tamu.edu





From [e-mail] Fri Jan 26 13:39:33 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!news.dfn.de!scsing.switch.ch!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!gatech!usenet.eel.ufl.edu!freenet2.freenet.ufl.edu!afn17891
From: "Thomas W. Castle" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: CQ: All HF remote base users..............
Date: Tue, 23 Jan 1996 01:11:37 -0500
Lines: 32
Message-ID: <[e-mail]>
References: <4dttam$[e-mail]>
NNTP-Posting-Host: freenet2.afn.org
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]
In-Reply-To: <4dttam$[e-mail]>

On 21 Jan 1996, MFP - KB7YJJ wrote:
> Attention all other REMOTE HF group operators:
> We have to put our UHF to HF (Kenwood 690AT and HAMLINK AEA Controller)
> at our rptr site......
> I would be very happy to hear what antennas you guys are using...
>
> Our next bet might be a dipole...
>
Not sure on how far your trying to spread the freq; but how about a
multi-band trapped antenna <so as to get the most usable freq ranges>
mounted in a vertical manor with fiberglass stand-offs at 3 points...?

We used this method a year ago on field day an it worked pretty good.
It was mounted using 3 fiberglass poles <2 1/2" dia. by 8' long>, one
at the top half end, one at the center <coax-mtg> and 1 at the bottom
end. I believe the antenna was a B&W 10 - 80 mtr band trapped antenna.
Even without readjusting any of the traps or lengths, we were able to
use the tuner of a Kenwood TS50 an matching tuner <automatic> and get a
acceptable SWR. We Were Able to work all the bands of the antenna,
with less than 1.5 SWR. Bear in mind that the antenna was previously
tuned an set up, elseware in a conventional manner and had been tweaked
in at "that" time.

If nothing else its simple to try an someone in your group may have
an antenna to work with to try it out...?

BTW> have you considered the AEA Isoloop Antenna.?

Hope this helps
De Tom




From [e-mail] Fri Jan 26 13:39:34 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Chris Boone <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: CQ: All HF remote base users..............
Date: 22 Jan 1996 01:06:04 GMT
Organization: ENTERGY/Gulf States Utilities
Lines: 24
Message-ID: <4dunts$gqk$[e-mail]>
References: <4dttam$[e-mail]>

I am using the following set up on my HF remote base:

Kenwood TS680 with allmode squelch mod
ACC SM100 Shackmaster
Full duplex 420 Mhz link to my rptr site 5 miles south and also
have dial up via the SM100 phone line

Full wave 80 m loop with apex at 100ft and bottom at 20ft off
ground (in triangle shape) fed with 75 ohm coax at top of apex.

Works great on all bands from 80-10 and even 6! (SWR looks good
anyway)....hope to put a 160 mtr full wave loop up and then use a
10mtr and 6 mtr verticals for those bands (with relay switching
handling the selection).....next on the list is a TS690s (the
rcvr in the 680 stinks sometimes!)

73
Chris

--
Senior Telecommunications Technician  [e-mail]
ENTERGY/Gulf States Utilities         1:106/4267 FIDOnet
WB5ITT - Advanced Class               BBS- 409-447-4267 (WBBS)
PG-9-5322  FCC Commercial             409-525-2001 PhoneMail 24hr


From [e-mail] Fri Jan 26 13:39:35 1996
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!netnews.upenn.edu!dsinc!ub!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!usc!news.service.uci.edu!usenet
From: [e-mail] (Brian Williams)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Crossbanding antenna Dip or Duplexer?
Date: 19 Jan 1996 23:29:04 GMT
Organization: UCI Medical Center
Lines: 20
Message-ID: <4dp9g0$[e-mail]>
References: <4deq69$[e-mail]>
NNTP-Posting-Host: dialin9125.slip.uci.edu
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1

In article <4deq69$[e-mail]>, [e-mail] says...
>
>Hello, i would like to run my dual band rig crossbanding into ONE antenna
>now, do i need to get one of those small duplexers for 30-40$ or
>a multi hundred <or homebrew> cavitiy?
>thanks
>David

David,
Duplexors are not required when on different bands, and in fact, the small
duplexors that I think you're speaking of would require you to use two of
them (at the dual band antenna and at the radio).  That would involve more
losses and expense than it is worth.
If you're not running a power amplifier, your radio has enough isolation
built in to use it for crossbanding.  Be careful of tone encoding and
decoding or use DTMF coding to prevent other signals from tripping your
radio.

Brian N6ZAU



From [e-mail] Fri Jan 26 13:39:37 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!news.uni-mainz.de!news.th-darmstadt.de!uni-erlangen.de!rznews.rrze.uni-erlangen.de!news
From: Richard Hieber <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: European archive site?
Date: 25 Jan 1996 16:00:42 GMT
Organization: RRZE
Lines: 21
Message-ID: <4e89fa$[e-mail]>
NNTP-Posting-Host: miraculix.rrze.uni-erlangen.de
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.antenna:18654 rec.radio.amateur.homebrew:12921

Hi all,

as I tend to use my Usenet browser quite unregulary, I'd prefer
to retrieve the traffic of the last few months or so at an
archive site. I know the official archive site of r.r.a.antenna
and of r.r.a.homebrew somewhere at a stateside location, but the
slowness of my access takes the fun out of it.

I'd like to know an archive site for the rec.radio.amateur.*
newsgroups somewhere in Europe. I don't need an FTP site for
programms or stuff, just archived Usenet traffic. Do you know
any, over here in the Old World?

Vy 73,
Richard

--
Richard Hieber, DL8MFQ/AA8CP
EMAIL: [e-mail]




From [e-mail] Fri Jan 26 13:39:37 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Y.K.Chan <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Extremely narrow-band antennas?
Date: 22 Jan 1996 01:07:56 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 26
Message-ID: <4duo1c$su8$[e-mail]>
References: <4d729b$[e-mail]>

Hi Paul,
I am a bit confused with your comments and wonder if you can help
me understand some of the details.

/I disagree with the part about the efficiency going down.
Can you elaborate the term efficiency use in here.

/The radiation resistance does go down.  That makes it more
/challenging to keep the ohmic losses low.
I cannot agree with you more.:-)

/An indication of low efficiency in a small antenna is bandwidth
(what bandwidth?) that is larger than expected (expected what
bandwidth?).

/In the case of the orginal poster, he wanted a low bandwidth.
/So he has good reason to do everything possible to have high
/efficiency.
Can you give us examples for high efficiency?

YK

--
Y.K.Chan
B.C.Canada
[e-mail]


From [e-mail] Fri Jan 26 13:39:38 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!howland.reston.ans.net!usc!newshub.csu.net!ssu-2en173.sonoma.edu!user
From: [e-mail] (Bob Butler)
Newsgroups: rec.radio.amateur.antenna
Subject: Feed Line - Ethernet Coax
Date: Tue, 23 Jan 1996 18:12:52 -0800
Organization: Sonoma State University, Information Technology
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: ssu-2en173.sonoma.edu

I think this has been discussed in the past, but does anyone know how well
IEEE 802.3 (82959) Ethernet 10base5 cable works as transmission feed line
compared to something like RG-8U?  Are they fairly comparable as far as signal
loss goes in the 2m band?  It definitely has to be better the RG-58U I'm
using now, which is about 5db loss/100' @ 146mhz.  Thanks for any info or
comments.

-Bob
KE6EHO

--



From [e-mail] Fri Jan 26 13:39:39 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!newsfeed.internetmci.com!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!usenet
From: John Passaneau <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Feed Line - Ethernet Coax
Date: Wed, 24 Jan 1996 09:51:27 -0800
Organization: Penn State University
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: thing-two.phys.psu.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6a (Win16; I)
To: Bob Butler <[e-mail]>

Bob Butler wrote:
>
> I think this has been discussed in the past, but does anyone know how well
> IEEE 802.3 (82959) Ethernet 10base5 cable works as transmission feed line
> compared to something like RG-8U?  Are they fairly comparable as far as sign
al
> loss goes in the 2m band?  It definitely has to be better the RG-58U I'm
> using now, which is about 5db loss/100' @ 146mhz.  Thanks for any info or
> comments.
>
> -Bob
> KE6EHO
>
> --
> Its the same as RG-8 type cable, just a different jacket.
John Passaneau, WB8EIY, State College Pa.


From [e-mail] Fri Jan 26 13:39:40 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Feed Line - Ethernet Coax
Date: 26 Jan 1996 06:03:01 -0700
Organization: Primenet Services for the Internet
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        Take a sample and compare it with some good quality coax.
        I used to work in commercial office buildings as building operator. I supervi
sed
tenant improvments and had access to all the salvage coax I wanted.
        The bad news is the 50 stuff often had only token shielding. I would guess
about 50%! I did aquire a couple hundred feet of RG-62 (~100 ohms) which I hav
e
used for impeadance transforms.
        Look for brand names, plenum-grade has a fire-resistant jacket. None have
uv protection.

Jim N7TCF


From [e-mail] Fri Jan 26 13:39:41 1996
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From: [e-mail](Jim Stubstad )
Newsgroups: rec.radio.amateur.antenna
Subject: Re: G-Line Feeders
Date: 21 Jan 1996 01:01:11 GMT
Organization: Netcom
Lines: 31
Message-ID: <4ds38n$[e-mail]>
References: <4dop1b$[e-mail]> <[e-mail]>
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X-NETCOM-Date: Sat Jan 20  5:01:11 PM PST 1996

In <[e-mail]> [e-mail] (J. L.
Blanton) writes:
>
>In article <4dop1b$[e-mail]>, [e-mail] wrote:
>
>> I have for years read little tid-bits about the G-Line feeder. This
a
>> single wire, very low loss (even at SHF+) feeder system developed by
>> some fellow whose last name starts (started? it has been around a
long
>> time) with G.  ...
>
>One limitation of G-line is that it doesn't tolerate sharp bends very
well
>or close proximity to other objects (especially metallic ones).
>
>Lee, WA8YBT/6

I agree, the launchers are a bitch, and even the droop of the wire can
be a problem, to be serious you need tensioned rods or solid copperclad
steel, plain copper creeps, and stranded increases losses.  My vote is
for open wire line, it tolerates all but sharp bends, and it is easier
to transition to.  I'd rather build a balanced line with half the loss
by using more air, less plastic between to minimize dielectric and wet
dirt losses, and bigger wires spaced farther apart to minimize skin
effect losses than build launchers and align G line.  If it's really
microwave, you should have an up/down converter or at least a PA/LNA up
at the antenna feed with a coax drop anyway.  The (french?) inventor
was named Gobau, hence "Gobau line."

                                                Jim


From [e-mail] Fri Jan 26 13:39:42 1996
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From: Jeff Blumenfeld KB3DX <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: GAP Titan
Date: Mon, 22 Jan 1996 15:36:20 +0000
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I have an R5, which is great, and just purchase a GAP Titan (still
in the box) because I wanted 40 and 80.  What does anyone think
about the GAP?  Should I buy an R7 instead?


From [e-mail] Fri Jan 26 13:39:43 1996
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From: M Biddiscombe <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: GAP Titan DX Vertical Antenna
Date: 22 Jan 1996 21:35:59 GMT
Organization: UnipalmPIPEX server (post doesn't reflect views of UnipalmPIPEX)
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Can anyone please advise me on the best method of mounting the GAP Titan
antenna eg, at ground level or on a mounting pole?



From [e-mail] Fri Jan 26 13:39:43 1996
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From: Jeff Blumenfeld KB3DX <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GAP Titan DX Vertical Antenna
Date: Tue, 23 Jan 1996 13:55:17 +0000
Organization: CompuServe Incorporated
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I just bought one of those myself, but haven't put it up yet, due to
the weather.  The GAP folks (as I guess you know) say you can mount
it either about 8' off the ground on a metal pipe, or at rooftop,
with no difference in performance.  I'd be interested in hearing
your experience with its performance.


From [e-mail] Fri Jan 26 13:39:45 1996
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From: Jeff Blumenfeld KB3DX <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GAP Titan DX Vertical Antenna
Date: Wed, 24 Jan 1996 10:34:38 +0000
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Subj:   Re: GAP Titan DX Vertical Antenna
Date:   Wed, Jan 24, 1996 4:32 AM EDT
From:  [e-mail]
X-From: [e-mail] (Peter C. Markham)
To:     [e-mail]

>I just bought one of those myself, but haven't put it up yet, due to
>the weather.  The GAP folks (as I guess you know) say you can mount
>it either about 8' off the ground on a metal pipe, or at rooftop,
>with no difference in performance.  I'd be interested in hearing
>your experience with its performance.

  I made the mistake of purchasing the Titan, after seeing it at the Dayton,
94 hamfest. I mounted it on a the roof of a single story wood frame building
with the counterpoise? 36" above the peak of the roof, 22 ft. above ground.

  I used my FT-890, the Titan switched direct, and the 80m dipole, straight,
at 33ft with balanced feed switched through an MFJ-949B tuner, for the
following observations. Only on 40m did it perform better than my 80m dipole
at 33ft, at low angles, < 10 degrees, in most directions.  40m at >10 degrees
it was consistently down in all directions except a small sector off the ends
of the dipole, where it was 1 to 2 S units better. On 30m it was down by 2 S
units,  compared to the dipole in the directions of least difference between
the two antennas. On 7, 14, 18, 21, 24 and 28 mhz it was down > 1/2 S unit at
all az and el angles with very few exceptions. On 80m the performance was down

1 to 2 S units, in general, but given the antenna's space requirements and
physical length, I consider its performance acceptable.

  I used an MFJ-202 noise bridge to get an idea of ant Q, resonance and band
width. On 30m the resonance was 400khz high. On the other bands, it was
sufficiently close that operating environment/assembly, may have been
responsible for the errors noted. The Q was quite high and narrow on the high
end of 80m, exactly where it should have been for the capacitor used and
required on that band. As a general observation the other bands had an antenna

Q quite low and broad, which troubled me, bringing to mind the characteristics

of a dummy load.

  In the Fall of 94, a front passed through with winds gusting 50 to 60 mph
for a full day. The antenna was bent over some 20 degrees in a gentle curve in

the area a few feet above the "counterpoise". The decoupling/tuning rods were
all askew because of the twisting force generated when the antenna flexes in
the wind. I then removed the antenna from the roof, disassembled it,
straightened it, reassembled it and mounted it on a mast in the backyard with
the counterpoise 8 ft off the ground. I guyed it with 125 lb test nylon net
twine, in 90 degree directions just above the "gap". No mechanical problems,
since.

   No noticeable difference in performance, of any consequence, was noted in
its new location.

   During the Summer of 95, a friend brought over, at my request, a high rent,
new, Hewlett Packard spectrum analyzer and tracking generator, with which we
swept the antenna from 3 to 30 mhz. The results were very consistent with what

I had determined with the noise generator, and in general, confirmed my
suspicions that the antenna did have bandwidth, resonance and Q
characteristics that came dangerously close, on most bands, to emulating those

of a dummy load.

   No signal checks were made in transmit because I can in no way determine
the validity of a "signal report"

   I touched bases with GAP personel on 3 occaisions, over a period of the
first 18 months, and was in general, informed that my observations were
probably a consequence of operating environment.

   I submit that the same characteristics exhibited by the antenna at 2
different locations is probably a consequence of design, barring some
subtle assembly mistake I made, assembling the antenna twice, with meticulous
care, by the book. I accept that my empirical methods may not hold up under
the scrutiny of perfectionists. I have no doubt of the general differences in
operating characteristics of the 2 antennas compared. I have no doubt about
the general antenna characteristics observed with the noise bridge and
spectrum analyzer. I have made my way through life as a generally competent
electronic technician who thinks about what he does, and despises wild a--
guesses.

   For the better part of the last 9 months, I have been using it with a Comet
duplexer as an BCB/SW antenna for listening only, and as a 2 meter antenna for

local work. SWR on 146 is 1.6:1

   Yes, I have buyer's remorse.  :-)

                                      Pete, wa4hei


From [e-mail] Fri Jan 26 13:39:47 1996
Path: news.epix.net!uunet!in1.uu.net!cs.utexas.edu!howland.reston.ans.net!nntp.crl.com!crl7.crl.com!not-for-mail
From: [e-mail] (Tim Heinrichs)
Newsgroups: rec.radio.amateur.antenna
Subject: Glen 326G for sale
Date: 21 Jan 1996 15:17:14 -0800
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 82
Message-ID: <4duhhq$[e-mail]>
NNTP-Posting-Host: crl7.crl.com
X-Newsreader: TIN [version 1.2 PL2]

GREEN SHEET from [e-mail]

For Sale:

Glen 326-G Digital Controller manufactured by Glen Manufacturing in
Stockton, CA

<start: direct quote from the manual>

"Congratulations, you have just purchased a very unique and precision
instrument.  This unit contains a VFO, Digital Computer, Frequency
Counter, and a 5 digit LED display.  Its function is to generate a stable
variable frequency, compute and display the resultant transmit or receive
frequency.

Technical Specifications:

VFO Frequency Range--7 to 25 MHz on fundamentals, 14 to 50 MHz on 2nd
                     harmonic.

Tuning Ratio---------10 : 1 vernier on Coarse, and Fine controls.
                     500 KHz may be tuned on any band.

High/Low switch------Shifts any selected frequency up 400 KHz,
                     allowing coverage of any band of 900 KHz.

Display--------------MC or KC gives a choice of either 1KHz, or .1KHz
                     resolution on display.

Accuracy-------------1KHz in MC position, .1KHz in KC position.

Counter Range--------5KHz to 50MHz, fully programmable on 5 digits.
                     X1 or X2 multiplier for harmonics.

Power, Base model----117 Volts AC @ .1 Amps @ 60 Hz

Power, Mobile model--10 to 20 Volts DC negative or positive gnd.
                     Either lead may be reversed with out regard
                     to polarity.

Note:
Novice band, business band, or citizen band is not permitted the use of a
VFO to transmit with.  Only crystal controlled transmissions are
authorized by the FCC on these bands.

If the purpose of the VFO is to monitor the various bands previously
mentioned, and a transceiver is used, then the transmitter should be
dis-abled or the microphone removed to prevent the possibility of
transmitting.

<end-direct quote from the manual>

Face description:

Has five digit readout
High/Low switch
Fine tune pot
Coarse tune pot
on/stby switch
on/off power switch

Back description:

KC/MC display switch
X2/X1 multiplier switch
frequency set adjustment
1/2/3/4/5/6 band selector switch


asking $150.00

all offers considered

email for more information----

Tim Heinrichs   Marietta, Georgia  U.S.A.
  Internet: [e-mail]

If you would like to be put on my mailing list, send email.  I
periodically send out green sheets on mainly electronics, new and used,
several unusual items.



From [e-mail] Fri Jan 26 13:39:47 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!s81.phxslip4.indirect.com!tracker
From: [e-mail] (Mark Saunders)
Newsgroups: rec.radio.amateur.antenna
Subject: GPS antenna designs needed
Date: Mon, 22 Jan 1996 18:34:35 UNDEFINED
Organization: Amateur Radio Station KJ7BS
Lines: 9
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Hello and thanks for reading this message.

Does anyone have antenna designs for a GPS receiver, Garman 45 to be specific?







From [e-mail] Fri Jan 26 13:39:48 1996
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From: [e-mail] (Mark Saunders)
Newsgroups: rec.radio.amateur.antenna
Subject: GPS antenna designs needed
Date: Mon, 22 Jan 1996 18:24:24 UNDEFINED
Organization: Amateur Radio Station KJ7BS
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: s81.phxslip4.indirect.com
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Hello and thanks for reading this message.

Does anyone have antenna designs for a GPS receiver, Garman 45 to be specific?




From [e-mail] Fri Jan 26 13:39:49 1996
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!News.MO.NET!opus.anet-stl.com!news.anet-dfw.com!imci2!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!oleane!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.hol.gr!news
From: Douglas Braun <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GPS antenna designs needed
Date: 23 Jan 1996 08:09:34 GMT
Organization: Hellas On-Line
Lines: 8
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X-URL: news:[e-mail]

I've been looking for a couple of years for a GPS auxillary antenna
project, and the best I've seen was a patch antenna in last October's QST.
It was a very good article, but I haven't had a change to build it...

Douig Braun

SV/N1OWU



From [e-mail] Fri Jan 26 13:39:50 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!freenet3.freenet.ufl.edu!afn17891
From: "Thomas W. Castle" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Ground Radials...?
Date: Thu, 25 Jan 1996 02:34:42 -0500
Lines: 40
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Hi Tom here:      I am sure this subject has been gone over here, many
times before; but I am just now getting into Vertical Antennas'...

I would like to take an area that I have, 150' x 150' that is in the
clear; an put a Vertical antenna in the center of it. The center of
this strip of land is about 100' from the back of my Ham shack. There
are no trees' or anything in this area period...

I have read that the more radials you use the better... I have also
been told to put multiple radials in the same trench. The figures I
was given was 33', 65' & 130': splitting those figures in half at the
intersecting point <X> of 9 sets of these. At the intersecting point
they would be cut an soldered to a 6" ring on copper wire, which would
be positioned symmetrically around a 1 & 1/2" pipe mounted in the
ground, that would hold your vertical antenna. This would give you
a total of 27 wires attached to the ring; which in turn would be used
to connect to your antenna. I was also told to put grounding rods
at the end of each wire and bond them together.

To me this seems like over kill...? Not to mention a lot of digging.
I can see the idea of using part of a wave length to figure in the
ground wire length. The Question is : Do you need to figure them for
20, 40 & 80 like that for each band? If so how about 15 & 10 mtrs as
well? Not to mention the WARC bands..?

The type of vertical I want to use is Cushcraft, Butternut or whatever;
I just want to put down the best, most effective & most reasonable
ground system that I can...   "I only want to do it "once".....
I would like to keep it simple, if at all possible..?
I want to put up either a 5  or a 8 band vertical.

What type an size of one "Size Fits All" ground system should I build?
I live in N. Fla. an have reasonabley good soil conditions. Had friend
from F.P.L. check the ground conductivity with a "Meggar". A 20'
ground rod gave a .5 ohm ground <1" solid brass rod x 20'>...

Thanks ahead of time for any assistance, on this project of mine...

De KD4QHH  a.k.a. Tom.



From [e-mail] Fri Jan 26 13:39:52 1996
Path: news.epix.net!uunet!in1.uu.net!tcsi.tcs.com!agate!holonet!colossus.holonet.net!woodybbs!1-106-4267-0!chris.boone
From: [e-mail] (Chris Boone)
Date: 20 Jan 96 07:56:33
Newsgroups: rec.radio.amateur.antenna
Subject: HELP:What did I buy??
Message-ID: <[e-mail]>
X-FTN-To: Dan Sitterley
Organization: WoodyWare Software, Inc.
Lines: 37

5*** Quoting Dan Sitterley to All dated 01-17-96 ***
> From: Dan Sitterley <[e-mail]>
> Subject: HELP:What did I buy??
> Organization: Galaxy Star - Northeastern Oklahoma Internet
>
> I recently purchased 5 sections of what I thought was ROHN 45 tower
> only
> to find out that it is smaller than ROHN 45 (which has an 18" face) and
>
> larger than ROHN 25 (which has a 12" face). This tower has a 15" face
> and
> has the same Z bracing as ROHN. I took a section to our club meeting
> and
> no-one had seen anything like it. I need to find a top section for it
> and
> don't know where to start looking. I believe that the legs are 1.25" in
>
> diameter and is made of very heavy zinc coated metal.
>
> Any help would be appeciated.
>
sounds like what you got is the Motorola special....ROHN makes a special size
for the Big M inbetween 25 and 45....(they MAY call it 35 but Ive never seen
it in the ROHN catalogs)...


Call ROHN and ask them....

73
Chris
WB5ITT
--
|Fidonet:  Chris Boone 1:106/4267
|Internet: [e-mail]
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Fri Jan 26 13:39:53 1996
Newsgroups: rec.radio.amateur.antenna
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From: [e-mail] (John Ackermann)
Subject: Re: HELP:What did I buy??
X-Nntp-Posting-Host: cn2935.daytonoh.attgis.com
Message-ID: <[e-mail]>
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References:  <[e-mail]>
Date: Thu, 18 Jan 1996 10:03:22 GMT

In article <[e-mail]> Dan Sitterley <[e-mail]> wri
tes:

>I recently purchased 5 sections of what I thought was ROHN 45 tower only
>to find out that it is smaller than ROHN 45 (which has an 18" face) and
>larger than ROHN 25 (which has a 12" face). This tower has a 15" face and
>has the same Z bracing as ROHN. I took a section to our club meeting and
>no-one had seen anything like it. I need to find a top section for it and
>don't know where to start looking. I believe that the legs are 1.25" in
>diameter and is made of very heavy zinc coated metal.

Going from an old recollection here, but I think that Motorola used to sell a
tower that was manufactured for them by Rohn, and that was intermediate in
size between 25G and 45G -- it may even have been called 35G.

John   AG9V



From [e-mail] Fri Jan 26 13:39:54 1996
Path: news.epix.net!news.sprintlink.net!news.oz.net!news.wwa.com!news
From: [e-mail] (Len Revelle)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HELP:What did I buy??
Date: Wed, 24 Jan 1996 04:03:05 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
Lines: 27
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X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (John Ackermann) wrote:

>In article <[e-mail]> Dan Sitterley <[e-mail]> wr
ites:

>>I recently purchased 5 sections of what I thought was ROHN 45 tower only
>>to find out that it is smaller than ROHN 45 (which has an 18" face) and
>>larger than ROHN 25 (which has a 12" face). This tower has a 15" face and
>>has the same Z bracing as ROHN. I took a section to our club meeting and
>>no-one had seen anything like it. I need to find a top section for it and
>>don't know where to start looking. I believe that the legs are 1.25" in
>>diameter and is made of very heavy zinc coated metal.

>Going from an old recollection here, but I think that Motorola used to sell a

>tower that was manufactured for them by Rohn, and that was intermediate in
>size between 25G and 45G -- it may even have been called 35G.

>John   AG9V

        I used to have a tower similar in diminsions to Rohn 25G but was made
in Racine, Wisc.. It was made by a "Universal Tower Company" which was
not the aluninum tower people. This one was only 1/2" or so wider than
25G and had vertically oriented bolts going thru angle steel welded to
the outside of the tower legs. The may have made a larger version as
well.





From [e-mail] Fri Jan 26 13:39:56 1996
Path: news.epix.net!news.sprintlink.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!news.orst.edu!news.PEAK.ORG!billn
From: [e-mail] (Bill Nelson)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: HF DF antenna
Date: 22 Jan 1996 08:06:42 GMT
Organization: CS Outreach Services, Oregon State University, Corvallis, OR, USA
Lines: 9
Message-ID: <4dvgii$[e-mail]>
References: <4dub5j$[e-mail]>
NNTP-Posting-Host: peak.org
X-Newsreader: TIN [version 1.2 PL2]

Laurence Jamieson ([e-mail]) wrote:
: Does anybody know where I can find details on HF direction finding
: antennae? I am looking for any information, e.g. ready made hardware,
: designs, books containing the theory, sources of any of these.

I don't know about recent Radio Amateur's Handbooks, but those of the
70s contained DF information and construction details.

Bill


From [e-mail] Fri Jan 26 13:39:57 1996
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From: [e-mail] (Laurence Jamieson)
Newsgroups: rec.radio.amateur.antenna
Subject: HF DF antenna
Date: Sun, 21 Jan 1996 21:37:23 GMT
Lines: 12
Message-ID: <4dub5j$[e-mail]>
NNTP-Posting-Host: foula.zetnet.co.uk

Does anybody know where I can find details on HF direction finding
antennae? I am looking for any information, e.g. ready made hardware,
designs, books containing the theory, sources of any of these.

Thanks in advance

--
Laurence Jamieson                 [e-mail]
Shetland Islands
Scotland
U.K.



From [e-mail] Fri Jan 26 13:39:58 1996
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.localnet.com!news2.net99.net!news.cais.net!news.supernet.net!news.cyberport.com!news.chatlink.com!news.internetMCI.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!uknet!florence.scotnet.co.uk!usenet
From: [e-mail] (Lord John)
Newsgroups: rec.radio.amateur.antenna
Subject: Hygain TH7DX Mast Clamp and Parts needed?
Date: Sun, 21 Jan 1996 21:43:31 GMT
Organization: The Scottish Internet Supplier
Lines: 9
Message-ID: <4dub0e$[e-mail]>
NNTP-Posting-Host: dynamic33-hobbit.celtic.co.uk
X-Newsreader: Forte Free Agent 1.0.82

My TH7DX is in need of repair and with the Spring drawing near  I am
looking for a source of parts. In particular I need a boom to mast
clamp.  Do you have any idea of the cost?

Many thank

de LordJohn
GW0ACH



From [e-mail] Fri Jan 26 13:39:58 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news1!ind-008-237-73
From: [e-mail] (Patrick Croft)
Subject: Re: Hygain TH7DX Mast Clamp and Parts needed?
X-Nntp-Posting-Host: ind-008-237-73.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
X-Newsreader: News Xpress Version 1.0 Beta #2.1
References: <4dub0e$[e-mail]>
Date: Tue, 23 Jan 1996 15:36:31 GMT
Lines: 16

[e-mail] (Lord John) wrote:
>My TH7DX is in need of repair and with the Spring drawing near  I am
>looking for a source of parts. In particular I need a boom to mast
>clamp.  Do you have any idea of the cost?
>
>Many thank
>
>de LordJohn
>GW0ACH
>
HyGain sells these items and will accept charge cards.  The pricing will not b
e cheap. ($50+ range I think)
 You may wish to post a want to buy note to source someone p[arting out a yagi
 with the parts you need .
Buty replacement STAINLESS STEEL bolts and associated hardware local - MUCH ch
eaper than HyGain!
Shipping to GW land will be a little hassle, but UPS and FedEx gets packages t
here everyday.
73
Patrick  WB9IQI


From [e-mail] Fri Jan 26 13:39:59 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news.utdallas.edu!news.starnet.net!wupost!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: J-Pole calculations
Date: Sun, 21 Jan 1996 18:21:39 GMT
Organization: Inlink
Lines: 18
Message-ID: <4du0fn$[e-mail]>
References: <4djhhn$[e-mail]>
NNTP-Posting-Host: slip86.inlink.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (John Scott) wrote:

>Does anybody know where I could get the actual calculations needed for
>J-Pole design.  I am interested in playing around with different
>diameters of pipe etc.

>Thanks ahead of time



Check out my web page, K-Factoring charts and several J-Pole designs
already calculated for you.  To change pipe sizes, just change the
K-Factor multiplier for the pipe diameter.
http://www.inlink.com/~raiar

TTUL - 73+ de Gary - KG0ZP




From [e-mail] Fri Jan 26 13:40:00 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: J-Pole gain
Date: 22 Jan 1996 17:59:02 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 31
Message-ID: <4e0j96$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Edward Lewis ([e-mail]) wrote:
: I would like to know what the gain of a 2 meter j-pole would be, also
: is a j-pole dirrectional, and if so to what side. I recently

I'll choose to disagree slightly with Roy's post on this one...  The
simulations I've done indicate that, because of antenna current on the 1/4
wave matching section, the gain is slightly less than that of a simple
half-wave in the same place as the half-wave part of the J-Pole.  It's a
fraction of a dB.  This was true for freespace as well as for a-few-feet-
above-ground simulations.  On the other hand, end-feeding a half-wave
against four quarter-wave radials resulted in a fraction of a dB _more_
gain than a center-fed half-wave...

I'd say in practice none of this matters compared to other factors.  Roy's
comment about decoupling the feedline is important, and it is ALSO
important to not simply attach the J-pole to a mast, if you want to know
about your pattern.  That is, if the mast, including the length of the
quarter wave matching section, is resonant on your operating frequency, the
small antenna current at the top of the matching section can become a much
larger current odd quarter waves down the mast.

Similarly, the simulations indicated that the J-Pole is slightly
directional in the horizontal plane, but it's a small fraction of a dB with
the matching-section dimensions that hams typically use.  If the matching
section is, for example, 1" diameter pipe on 3" centers, the effect will be
greater than if it's twinlead with 1/2" spacing.

--
Cheers,
Tom
[e-mail]


From [e-mail] Fri Jan 26 13:40:01 1996
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From: [e-mail] (Edward Lewis)
Newsgroups: rec.radio.amateur.antenna
Subject: J-Pole gain
Date: Sat, 20 Jan 1996 16:51:13 GMT
Organization: West Coast Online's News Server - Not responsible for content
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: dsp228.dsp.com
X-Newsreader: Forte Agent .99c/16.141

I would like to know what the gain of a 2 meter j-pole would be, also
is a j-pole dirrectional, and if so to what side. I recently
constructed a 2 meter j-pole with much help from readers of the
newsgroup, and it seems to work very well. I optamized the frequency
to our local aprs frequency 145.010 mhz by cutting the antenna 1/4
inch shorter than my plans. Than I added couplers to the ends and
adjusted the lenth for the lowest swr which was 1.1.
73


From [e-mail] Fri Jan 26 13:40:03 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!wetware!wsrcc.com!news.orst.edu!news.PEAK.ORG!billn
From: [e-mail] (Bill Nelson)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Looking for info on legal cases involving commercial antenna-tower construction
Date: 26 Jan 1996 05:24:35 GMT
Organization: CS Outreach Services, Oregon State University, Corvallis, OR, USA
Lines: 15
Distribution: world
Message-ID: <4e9oij$[e-mail]>
References: <4dk20l$[e-mail]> <4dq9b5$[e-mail]>
NNTP-Posting-Host: peak.org
X-Newsreader: TIN [version 1.2 PL2]

[e-mail] wrote:

:    I may be wrong, but I don't think it's under local jurisdiction.
: If you get approval from the FCC and the FAA, that's all you need,
: unless they are trying to claim a zoning problem.   Check with the
: FCC office in Washington D.C. on this.

Nope. The FCC has ruled that local government must make "reasonable
allowances" for antennas. The ruling dealt with Amateur Radio Stations,
if I remember correctly.  However, they did not say that local agencies
had no say - not the "reasonable". Basically, it means that antennas
cannot be prohibited by local governments - but they can still limit
the size of the antennas and towers.

Bill


From [e-mail] Fri Jan 26 13:40:04 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news1!news
From: [e-mail] (Doug Borders)
Subject: loop antenna again
X-Nntp-Posting-Host: rus-ts0-26.holli.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
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X-Newsreader: Forte Free Agent 1.0.82
Date: Tue, 23 Jan 1996 07:35:24 GMT
Lines: 32


At the request of the one response I have gotten so far I will give
more detail as to why I am using a loop antenna.  I need the radiation
pattern characteristics of the loop so that I will be able to tell
when a car crosses the start/finish line.

My plan is to have a transmitter in each car that is transmitting a
carrier frequency of 49.9 MHz.  This carrier is then modulated with a
different frequency for each car(ie. car #1=1KHz, car #2=2KHz, etc.)
The loop antenna would then be placed under the surface of the track
at the start/finish line.  The start/finish line would bisect the
center of the loop.  Using this technique the antenna would pick up
the signal as it passes the first edge of the loop, the signal would
then null out at the center of the loop and then rise again as it
passes over the other edge.  By using circuitry I would be able to
detect this null point and thus have the exact time when the car
passes the line!!!!

This project at this point is not trying to go to production with all
of the bugs worked out, but instead just trying to prove this idea
would work on a small scale.

Any help on constructing loop antennas(material, size to receive
49MHz, equations, etc.) would be much appreciated.

Don't hold back,  tell me what you think!!!!


later,

Doug Borders



From [e-mail] Fri Jan 26 13:40:05 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon
From: Michael Haydon <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Loop Antenna Question
Date: Mon, 22 Jan 1996 21:16:29 -0600
Organization: Olivet Nazarene University
Lines: 51
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: tiger.olivet.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Doug;
 loop can be made of any kind of wire, copper preffered, the larger
formule for a single turn, untuned loop is 1005/freq in mhz=feet, for
your application, assuming you desire a fairly limited range (15-20 feet
or so), I would use a small, (6in diam or so) multi-turn loop tuned to
resonance with a plain old air variable capacitor (100pf or so), however,
these smaal loops are rather directional (bi-directional). Hop I have
been helpful.
 Mike KF8ZN


On Mon, 22 Jan 1996, Doug Borders wrote:

>
> Hello,
>
> I am looking for any information on how to build a loop antenna that
> can receive 49.9MHz.  I am working on my senior design project and am
> building a timing and scoring system for race cars that will use this
> loop antenna to receive signals transmitted from each car.  I used
> 49.9 MHz because of the availability of transmitter and receiver IC's
> for this frequency.
>
> My question is what should I make it out of?
>
> How big should it be?
>
> Are there simple equations to figure out the size vs. frequency?
>
> Should I just construct a loop and then tune it with a capacitor or
> varactor diode?
>
> What is the best way to construct a loop?  What size wire?  Should I
> use coil dope or somthing to mash the turns together?
>
> How does the number of turns in a loop change it's characteristics?
>
> Are loops generally wide ban receiving antennas?
>
> I know, I know....too many questions right?   I am not a big RF guy
> and am trying to find the best way to get this section of the project
> done.  Any help would be greatly appreciated.  If anyone has any help
> please e-mail me at [e-mail].  I don't frequent this board
> very often and don't want to miss out on good information.
>
> Thanks!!!!
>
> Doug Borders
>
>
>


From [e-mail] Fri Jan 26 13:40:06 1996
Path: news.epix.net!news.sprintlink.net!castle.nando.net!news
From: [e-mail] (George McCrary)
Newsgroups: rec.radio.amateur.antenna
Subject: Material for Vertical
Date: Tue, 23 Jan 1996 22:07:30 GMT
Organization: News & Observer Public Access
Lines: 16
Message-ID: <4e3m7m$[e-mail]>
NNTP-Posting-Host: grail1015.nando.net
X-Newsreader: Forte Agent .99a.107

Hello,

        I'm planning on consturcting a 40M 1/4 wave vertical in the woods
behind my house. I have a wire vertical already and would like to make
this one self-supporting (or at least not supported from above).

        Any suggestions for materials? Aluminium tubing is available in 6 foot
lengths and can be nested. What would the minimum size to use be? What
about TV mast? Conduit?

        Any suggestions would be appreciated.

                                        73 DE KQ4QM (George)

Please E-mail direct, my news server misses a lot of posts!



From [e-mail] Fri Jan 26 13:40:07 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!usenet
From: Joe Fitter   BV/N0IAT <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: MFJ SWR Analyzers - Any users?
Date: 26 Jan 1996 06:36:52 GMT
Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C.
Lines: 25
Message-ID: <4e9sq4$[e-mail]>
References: <4dbe97$[e-mail]> <4dkpgd$[e-mail]> <1197cc$[e-mail]>
NNTP-Posting-Host: 137.167.36.115
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Saw this post on the MFJ analyzers and couldn't resist a comment!

I've had one of the original models (MFJ-247 comes to mind).  It has
the built in freq counter, covers 160 thru 10 meters etc.

I have found this little gadget to be the absolute most worthwile
$150 investment in my ham radio career.  I use it ALL the time.  I
originally bought it to help tune up a bugcatcher mobile antenna.
After using it about a half dozen times the first time I had it out
of the box, I realized MFJ had a winner here.  I guess the new models
are even "fancier".

I enjoy antenna experimenting and it's really neat to try some
different wire configurations and get a quick and easy "swr curve"
chart, know the rough Q of the system, and know other possible points
of resonance (or near resonance).  It is also useful when testing
runs of coax cable, and even decent as a signal generator.

Only disappointment is that the input RF required to get the
freq counter to measure an over-the-air signal is too high.  Some
kind of preamp is needed to boost sensitivity for over-air readings.

regards,  Joe   BV/N0IAT  in Taipei TAIWAN




From [e-mail] Fri Jan 26 13:40:08 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in1.uu.net!world!blanket.mitre.org!linus.mitre.org!usenet
From: Al Wong <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: need info:  5/8 wave 2m/70cm antenna
Date: 23 Jan 1996 21:47:00 GMT
Organization: The MITRE Corp.
Lines: 13
Message-ID: <4e3l0k$[e-mail]>
NNTP-Posting-Host: m24837-pc.mitre.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 32bit)

Has anyone any recommendations for a good 5/8 wave 2m/70cm
mobile antenna?

Only one stumping block....The car is corvette, thus mag/trunk
mounts are out of the picture.

Is my only other choice a window mount antenna?


73, DE NF4GDD





From [e-mail] Fri Jan 26 13:40:09 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jim Storm)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: need info:  5/8 wave 2m/70cm antenna
Date: Thu, 25 Jan 1996 08:58:37 GMT
Organization: ix.netcom.com
Lines: 21
Message-ID: <4e7gnr$[e-mail]>
References: <4e3l0k$[e-mail]>
NNTP-Posting-Host: ix-smx-ca1-02.ix.netcom.com
X-NETCOM-Date: Thu Jan 25 12:58:35 AM PST 1996
X-Newsreader: Forte Free Agent 1.0.82

Al Wong <[e-mail]> wrote:

>Has anyone any recommendations for a good 5/8 wave 2m/70cm
>mobile antenna?

>Only one stumping block....The car is corvette, thus mag/trunk
>mounts are out of the picture.

>Is my only other choice a window mount antenna?


>73, DE NF4GDD

I use the Larsen glass mount and it works quite well. The Larsen has a
very large footprint which makes for good coupling and Physical
strength.

                                73, Jim WB6LWS





From [e-mail] Fri Jan 26 13:40:09 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!news.service.uci.edu!usenet
From: [e-mail] (Brian Williams)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Need mod for GE Masterpro (repeater)
Date: 19 Jan 1996 23:34:10 GMT
Organization: UCI Medical Center
Lines: 9
Message-ID: <4dp9pi$[e-mail]>
References: <4dhv21$[e-mail]>
NNTP-Posting-Host: dialin9125.slip.uci.edu
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1

In article <4dhv21$[e-mail]>, [e-mail] says...
>
>I am looking for any mods regarding the GE Masterpro.
I have schematics for the GE MASTRII but not for the Masterpro.
I am looking for mods for it.  If I locate Masterpro schematics, I'll
let you know.

Brian N6ZAU



From [e-mail] Fri Jan 26 13:40:11 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Need V-Beam advice
Date: 20 Jan 1996 07:09:17 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 29
Sender: [e-mail]
Message-ID: <4dqm1d$[e-mail]>
References: <4dp24d$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Bob,
In article <4dp24d$[e-mail]>, [e-mail] (Robert M.
Bratcher Jr.) writes:

>I'm thinking about replacing my 2 Rhombics next summer with a pair of
>V-beams of the same length as the Rhombics one a quarter wavelength
>behind the other with ladder line between them. I know they become
>unidirectional depending on which antenna the feedline hooks up to.
>Should I just change the feed at the antenna manually or can I run
>feedline from both antennas into the shack  without affecting
>directivity?

Here's where you may have difficulty. The phase must be shifted the proper
amount and the power properly distributed to each antenna to get a good
uni-directional pattern.

The length of the antennas and feedlines complicates this. The idea works
well on paper, but is a real hassle in the world. I can suggest some
methods to use if you want to use this method.

The second method is to run the antennas exactly 180 degrees out of phase.
This relaxes some of the problems, but not all of them. If you use this
method, feed the antennas with a common short section of open wire line.
Each conductor of that short line should connect to opposite feedpoint
sides of each V. Connect the feeder from the house to the exact middle of
that line. The pattern will be sorta bi-directional, losses in the antenna
will make the pattern favor the direction away from the feedpoint by a few
dB.



From [e-mail] Fri Jan 26 13:40:12 1996
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!news.umbc.edu!hookup!nntp-hub2.barrnet.net!pacbell.com!gw2.att.com!gw1.att.com!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!NewsWatcher!user
From: [e-mail] (Henry Baker)
Subject: Re: New Book about TESLA
Message-ID: <hbaker-2001961812380001@10.0.2.15>
Sender: [e-mail]
Organization: nil organization
References: <[e-mail]>
Date: Sun, 21 Jan 1996 02:12:38 GMT
Lines: 25
Xref: news.epix.net rec.radio.amateur.digital.misc:13729 rec.radio.amateur.antenna:18622

In article <[e-mail]>, <[e-mail]> wrote:

> We have translated the book: Tesla's Correspondence with Relatives in
> ENGLESH. It contains more than 200 pages and we recommend that it gets
> wide distribution in the scholastic community and elsewhere. It contains
> a Preface by Dr. A.S. Marincic, Introduction by Dr. Nenad V. Mandich,
> Tesla's relative and translated by Nicholas Kosanovich.
>
> TESLA MEMORIAL SOCIETY, Inc.  http://www.neuronet.pitt.edu/~bogdan/tesla
> 453 Martin Road
> Lackawanna, NY  14218        http://www.eskimo.com/~billb/tesla/telsa.html
                                                                    ^^^

This looks interesting, but you'll probably get more visitors if you spell
the URL correctly: http://www.eskimo.com/~billb/tesla/tesla.html
                                                        ^^^

--
www/ftp directory:
ftp://ftp.netcom.com/pub/hb/hbaker/home.html

Copyright (c) 1996 by Henry G. Baker.  All rights reserved.
** Warning: Due to its censorship, CompuServe and its subscribers **
** are expressly prohibited from storing or copying this document **
** in any form.                                                   **


From [e-mail] Fri Jan 26 13:40:13 1996
Path: news.epix.net!uunet!in1.uu.net!sunrise.gv.ssi1.com!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: PVC for Antennas
Date: Sun, 21 Jan 1996 22:36:29 GMT
Organization: RST Engineering
Lines: 36
Message-ID: <4duf5n$[e-mail]>
References: <4b9jgi$[e-mail]> <4bc3e4$[e-mail]> <4ceesi$[e-mail]> <[e-mail]> <4dbqne$[e-mail]> <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

"Anthony R. Gold" <[e-mail]> wrote:

>In article <4dbqne$[e-mail]> [e-mail] "Jim Weir" writes:

>> > Are you saying that a material that passes the oven test

>Do you have any example for a material which appears to be an
>insulator to a VOM?  An example of a near-perfect conductor may be
>amusing but it is not a serious or useful answer to the question.

[snip in consideration of bandwidth]

I'm glad you have set yourself up as the arbiter of what is serious
and useful.  I was taught that useful was what pointed out something
you didn't know and serious was anything you didn't do with a red bulb
on your nose.

Sure, how about carbon impregnated synthetic cloth (carbon fiber and
the generic kevlar/carbon series).  How about certain metallic paints
and wet wood.  Concrete with rebar in it.  Bandwidth limits the rest
of the examples.

My original point, sir.  You are using a VOM to measure, the other guy
was using a microwave.  Two ends of the RF spectrum -- DC and uW.
Neither of which have a damned thing to do with what a material does
at HF.  If you're gonna use it at 30 MHz. MEASURE IT at 30 MHz..

Jim


Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen. Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From [e-mail] Fri Jan 26 13:40:14 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Q: HT antenna design
Date: 26 Jan 1996 07:59:35 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 21
Message-ID: <4ea1l7$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

In article <[e-mail]>,
 <[e-mail]> wrote:
>Hello all!
>
>I would like to wind an antenna for an HT to be used at 446 MHz.  My objectiv

>is to make the antenna as short as possible.

Jason,

Many years ago, when I still thought that a HT is a usefull thing to have,
I built such an "antenna" (for two meters).

You take a  plastic rod with the diameter of RG58 cable (I happned to have
some teflon) drill from one end a 1 mm hole through the center 3/4"
or so deep, and a hole from the side to meet the central bore.
Than you feed a 7" (or longer) copper wire through the bore, solder a BNC
center pin to one end and wind the other end round the rod. When you mount
this thing in a BNC plug and enclose it in heat shrink you are done.
Of course it helps to adjust the length and winding pitch with a SWR meter.

73, Moritz DL5UH


From [e-mail] Fri Jan 26 13:40:15 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!news1.isp.net!news.isp.net!news.slip.net!not-for-mail
From: Ron Giuntini <rong@204.160.88.10>
Newsgroups: rec.radio.amateur.antenna
Subject: QRP Tuner
Date: 25 Jan 1996 06:59:45 GMT
Lines: 12
Message-ID: <4e79p1$[e-mail]>
NNTP-Posting-Host: sf-pm9-3.slip.net
Mime-Version: 1.0
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NNTP-NEWS-ADMIN: [e-mail]
X-Mailer: Mozilla 1.2 (Windows; U; 16bit)

Anyone have any suggestions on the best tuner for a 2 watt CW QRP rig?  I
am looking for something small, efficient and reasonable in price.  I
have looked at the MFJ catalogue but am unable to figure out which is
best for this purpose.  I would like to hear from any satisfied users.  I
have always been a little bit shy about using a tuner since my thought
was that it would be another power robbing device in the line.  Now that
I am going to be using QRP power levels I am concerned about this even
more.  Does anyone think using one is a bad idea?  Maybe some article in
QST would solve my problem. I could build it if I knew which issue might
have one in it.  E mail me at [e-mail] or reply here. Thanks for
reading this message.



From [e-mail] Fri Jan 26 13:40:17 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!despina.neptune.com!news.jsums.edu!gatech!newsxfer2.itd.umich.edu!agate!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!leon.d..zetekoff
From: Leon.D..Zetekoff%1:2619/211.9 (Leon D. Zetekoff%1:2619/211.9)
Date: 21 Jan 96 08:44:38
Newsgroups: rec.radio.amateur.antenna
Subject: Re: R-7 problems
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 46

To: Leon D. Zetekoff%1:2619/211.9%12:320/100.666
From: [e-mail] (Leon D. Zetekoff)
Subject: Re: R-7 problems
Organization: Z&K Enterprises

In message <4dtft7$[e-mail]> - [e-mail] (Leon D. Zetek
o
ff) writes:
:>
:>I just recently put an R-7 up (after almost 10 years with a tower and beam.
:>Because my counterpoise is only a few feet off my roof (which slopes) (it's
:>also about 12 feet above the ground ona  steel pipe) my SWR charts are all
:>over the place. I faxed Cushcraft and they gave me some pointers. Anyone els
e

:>have any pointers on what to try when retuning the antenna?
:>
:>40m it seems to resonant way below the bottom edge of the band and even ther
e

:>is is 3.0:1; 15m seems to resonant above the top of the band; 20 resonants i
n

:>the CW band. 10m resonants around 28.9; the rest seem to resonant around the

:>center of their band segments.

On other item, I homebuilt a common mode choke to try and keep RF out. On 10m
I can not run full power (100w using borrowed FT-890) as I get RF all over
the place.


Leon D. Zetekoff, N.C.E.
Z&K Enterprises
1338 SW 3 Street
Boca Raton, FL 33486

E-mail:         [e-mail]
CompuServe:     74015,674
AMPRnet:        wa4zlw@wa4zlw.#bcr.fl.us.na, [e-mail]


 # Origin: Usenet:Z&K Enterprises (1:2619/211.9)

 # Origin: Gateway ARNet <-> HamNet by HB9EBW (12:320/100.666)
--
|Fidonet:  Leon D. Zetekoff%1:2619/211.9 2:301/249.666
|Internet: Leon.D..Zetekoff%1:2619/211.9
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Fri Jan 26 13:40:17 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.cais.net!zippy.cais.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Relays That Hum
Date: 24 Jan 1996 23:28:54 GMT
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 10
Message-ID: <4e6fbm$[e-mail]>
NNTP-Posting-Host: 205.252.17.229
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

I have several 115 V AC relays that are at times produce an objectinal hum.  D
oes anyone
have experience in opeating such relays on DC.  The DC resistance is 75 to 85
ohms and
the coil wire looks about # 28 to 30.  Any comments for DC opeation - Voltage
likely
required - current required etc.

Thanks

Jim Sutton/AC4CZ
[e-mail]



From [e-mail] Fri Jan 26 13:40:18 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!chnews!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Rhombics at Low Heights?
Date: 26 Jan 1996 00:06:15 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 12
Distribution: world
Message-ID: <4e95tn$[e-mail]>
References: <4dkpnb$[e-mail]> <4dmogr$[e-mail]>
NNTP-Posting-Host: cmoore.ch.intel.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

[e-mail] (Richard Karlquist) wrote:
>However, the vertical was 10 to 15 dB. down vs the dipole
>on the 1000 mile paths where I had gotten great reports on the dipole.

Hi Rick, I just picked up a college text on Electromagnetics by Joseph Edminis
ter.
Here's a quote: "As the monopole radiates power only in the region above the
conducting plane, the total radiated power is one-half that of the correspondi
ng
dipole."  Where does the power go? :-)

73, Cecil, KG7BK, OOTC  (not speaking for my employer)




From [e-mail] Fri Jan 26 13:40:19 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!Portugal.EU.net!news.rccn.net!scsing.switch.ch!news.rediris.es!power.ci.uv.es!usenet
From: Esteban Sanchis <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Rotor
Date: 26 Jan 1996 08:14:44 GMT
Organization: Universitat de Valencia, Spain
Lines: 14
Message-ID: <4ea2hk$[e-mail]>
NNTP-Posting-Host: dxer.eleinf.uv.es

Hello to everybody

Could somebody tell me how I have to choose the rotor for my antenna.
The antenna I have bought is the TA-53M of Mosley. How do I know the
torque I need an the braking torque I require. The fast formula I have
used until know is:

     boomlength squared (ft) x weight (lb) x 0.03252 = torque (lb-in)

or   boomlength squared (ft) x weight (lb) x 0.03747 = torque (kg-cm)

Does somebody know a beter formula and any foemula for the braking torque.

      73' Stefan (EA5GMI)


From [e-mail] Fri Jan 26 13:40:20 1996
Path: news.epix.net!news.sprintlink.net!news.fast.net!dmarra.fast.net!user
From: [e-mail] (David M. Marra)
Newsgroups: rec.radio.amateur.antenna
Subject: Source for "Band Hopper" HF Mobile Ant.?
Date: Thu, 25 Jan 1996 16:09:23 -0400
Organization: FASTNET(tm) PA/NJ/DE Internet
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: dmarra.fast.net

Hi Everyone-

Does anyone know the source of an HF mobile antenna called the Band-Hopper?

It is a "screwdriver" design which has a built-in tuning mechanism to
raise and lower the antenna based on transmit frequency.  (This is what I
was told from someone who has seen one.)

Any information would be greatly appreciated!


Thanks in advance!


DAVE MARRA
n3odx


From [e-mail] Fri Jan 26 13:40:21 1996
Path: news.epix.net!news.sprintlink.net!wizard.pn.com!brighton.openmarket.com!decwrl!purdue!yuma!usenet
From: fiz <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Source of Al tubing?
Date: Thu, 18 Jan 1996 08:47:33 -0700
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 29
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ts3311.slip.colostate.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)

Joe Mack wrote:
>
> In article <[e-mail]> [e-mail] (Russ
Renaud) writes:
> >
> >fiz ([e-mail]) writes:
> >> Hi,
> >>
> >> I'm looking for a source of Al tubing to build some antennas. Any
> >> suggestions?
> >>
> >> ttfn fiz (KG0YG)
> >
>
> Dillsburg Aeroplane Works, Dillsburg PA, Charles Vogelsong propietor
> (717)-432-4589. Very pleased with them. Remember if you want 12'

This place is great. Thanks to all who recommended it. As it happens I not
only want to build antennas, I want to build an airplane (full size) and
didn't know about this company so it was a good lead there too. The tubing
for a 12 element, 2 meter yagi (with lots of excess) is on its way :)

Someone replying to this asked(?) whether there was a FAQ. I haven't seen
one listed for a long time. Does anyone know where it is? Maybe its
location should be posted now and then.

BTW, I finally passed the 20 wpm code last night on the 4th try in 11
months. Already had credit for 4B that was due to expire 2/13 :)

ttfn  fiz (KG0YG)


From [e-mail] Fri Jan 26 13:40:23 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!psgrain!newsfeed.internetmci.com!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: Sat, 20 Jan 96 12:36:31 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 12
Message-ID: <[e-mail]>
References: <4cuduv$[e-mail]> <4de25m$[e-mail]> <[e-mail]> <4dqjqv$[e-mail]>
NNTP-Posting-Host: bos1d.delphi.com
X-To: Michael A. Sterba <[e-mail]>

>Shouldn't one refer to author in these rags by their full pen
name. I hate
>getting tagged for sombody elses opinions since I am a real
"Sterba".   :)
>KG7FU

Sorry Michael, nothing personal, we're just nitpicking a
nitpicker. He's right a lot but it wouldn't make sense to
nitpick him when he's right.
From now on let's everyone use KNSerba or KNS.

73, Cecil, KG7BK, OOTC


From [e-mail] Fri Jan 26 13:40:24 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!woodybbs!1-106-4267-0!chris.boone
From: [e-mail] (Chris Boone)
Date: 19 Jan 96 20:00:47
Newsgroups: rec.radio.amateur.antenna
Subject: T2FD (Tilted Terminated Folded Dipole), any exp. ?
Message-ID: <[e-mail]>
X-FTN-To: Gert Carlsson
Organization: WoodyWare Software, Inc.
Lines: 38

5*** Quoting Gert Carlsson to All dated 01-16-96 ***
> From: [e-mail] (Gert Carlsson)
> Subject: T2FD (Tilted Terminated Folded Dipole), any exp. ?
> Organization: CIS Dept, Linkoping University, Sweden
>
> Does anybody have any experience with T2FD antennas?
> I believe that Barker and Williamson makes a commercial version of this
> antenna.
>
> I know that it is a compromise but I just don't have the space for more
> than
> one antenna. This antenna seems to be an interesting compromise.
>
> How do I feed it? I came across an article which suggested a 9:1 balun
> and
> coax feed. The terminating resistor should be around 390 Ohm in this
> case.
> So far, I have not been able to find a formula for calculating the
> terminating
> resistor. Does anyone know about this? I need an antenna that covers
> 10-30 MHz
The B&W antenna is a very compromised antenna....the balun is 16:1 not
9:1...the resistor "balance" section is 600 ohm non inductive....

Below 10 Mhz, the B&W antenna is outperformed by a 1/2wave dipole at the same
freq as much as 10 db!!!

73
Chris
WB5ITT

(a B&W AC3-30 owner)
--
|Fidonet:  Chris Boone 1:106/4267
|Internet: [e-mail]
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Fri Jan 26 13:40:25 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!swrinde!sgigate.sgi.com!sgiblab!news.spies.com!genmagic!bug.rahul.net!a2i!kaiwan.kaiwan.com!not-for-mail
From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.amateur.antenna
Subject: Testing co-axial filter
Date: 24 Jan 1996 09:56:47 -0800
Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338)
Lines: 23
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: kaiwan009.kaiwan.com


Greetings.

Many hams living in the metropolitans are having inter-mod problem with
outside antenna in the VHF and UHF bands.  I am wondering if anyone
has tried using filter made from l/4 lines to filter strong out of
band signals.

What I have in mind is to insert two open l/4 (electrical length)
transmission line stubs in series to the centre conductor and the shield.
Then parallel two shorted l/4 stubs from the centre conductor to the
shield at both end of the first two stubs.

I wonder what kind of insertion loss would result and what kind of
attenuation can be achieved, say 154 MHz for 2 meter band.  Also how
may we test for insertion loss and attenuation using average hams'
equipment.

73,

---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'


From [e-mail] Fri Jan 26 13:40:26 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail
From: [e-mail] (Garry Foster)
Subject: Transformer for Screwdriver type antenna
Message-ID: <1187cc$[e-mail]>
Date: Wed, 24 Jan 1996 11:47:41 GMT
Reply-To: [e-mail]
X-Newsreader: Forte Free Agent 1.0.82
Lines: 9

I hear that Don Johnson and others are now recomending a matchinng
transformer at the base of this antenna instead of the matching
capicators. Does anyone have the details on this transformer. Just
guessing I would assume about a 3-1 balun for 80 and 40. However it
seems that would harm 20 through 10. Does any one have any ideas on
this?

                                        Thanks Garry WB0NNO




From [e-mail] Fri Jan 26 13:40:27 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!newsfeed.pitt.edu!bb3.andrew.cmu.edu!casaba.srv.cs.cmu.edu!fore.com!forebarrel.fore.com!reh
From: [e-mail] (Russ Hoffman)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Transportable Antenna?
Date: 22 Jan 1996 04:21:23 GMT
Organization: FORE Systems, Inc.
Lines: 32
Message-ID: <4dv3c3$[e-mail]>
References: <4dcicr$[e-mail]>
NNTP-Posting-Host: forebarrel.fore.com
X-Newsreader: TIN [version 1.2 PL2]

jmleveron ([e-mail]) wrote:
: I would like to get some opinions on a good, back-packable
: (or readily vehicle transportable) omnidirectional and/or
: dir. antenna for 2m.

I constructed a 2m J-pole from 300 ohm twin-lead, housed inside a
length of 3/4" O.D. PVC pipe. On each end, I cemented a threaded pipe
cap receptacle. Then, I threaded a pipe cap on the top, and for the
bottom constructed a removable spike with which to plant the assembly
in the ground.

To constrcut the removable spike, take a 3/4" threaded pipe cap, drill
a hole in the center large enough to accomodate a 12" long aluminum
spike, like those use to secure aluminum rain gutters to houses. Save
the drill shavings. Poke the spike thru the hole in the pipe cap, then
drop the PVC shavings in on top the spike, and fill with PVC cement.
The PVC cement will melt the shavings, and when it solidifies, creates
a very rigid fixture.

When you want to go out in the field, simply pund the spike into the
ground, thread on the antenna, connect the coax, and you're on the
air!

You can also create other threaded mounts using pipe caps, so you have
a modular antenna system. I have a roof mount that I'm working on that
allows me to use the same J-pole at home as I use in the field.

73,

Russ Hoffman
[e-mail]
N3WDZ


From [e-mail] Fri Jan 26 13:40:28 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in1.uu.net!news.ssd.intel.com!ornews.intel.com!news
From: [e-mail] (Collier Chun)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: VHF/UHF disguise antenna for Mobile use
Date: Thu, 25 Jan 96 06:58:56 PST
Organization: Intel Corporation
Lines: 15
Message-ID: <4e85ua$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: cchun.intel.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.8

In article <[e-mail]>, [e-mail]
says...
>A friend and I were discussing the possiblites of combining the AM/FM
>antenna in a car with an antenna for VHF and or UHF use.  I have heard of
>some sort of matching circuts but have been unable to find any plans.. Any
>help would be greatly appreciated.. Thanks in advance

I've done two installations where I put my wideband Kenwood receiver/scanner i
nto
Toyota's.  Quick-testing revealed that the coax that Toyota uses between the b
roadcast
radio in the car to the antenna is almost useless above 150 MHz.  I use a VHF/
UHF duplexer
to feed the scanner so that the standard broadcast antenna is used for below 1
50 MHz and
a separate glass-mounted 440 MHz antenna covers the rest.

I don't know if other auto antenna coax has this same characteristics, but thi
s is a caveat.




From [e-mail] Fri Jan 26 13:40:29 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Roger A. Cox <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: VHF/UHF Log Periodic
Date: 24 Jan 1996 01:21:28 GMT
Organization: Telex Communications, Inc.
Lines: 10
Message-ID: <4e41io$n98$[e-mail]>
References: <4d8c6l$[e-mail]>

Mike,

Yes, LPCAD will work with HF logs also, however the program only
works with cylindrical elements.  So, to analyze an existing
antenna, you will need to use the average element OD.  To create
a new design, the average element OD should be converted into
equivalent tapered sections.  This will get you close.  The rest
is up to you.

73, Roger WB0DGF


From [e-mail] Fri Jan 26 13:40:30 1996
Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!news.net99.net!news.vbc.net!news.cais.net!xara.net!SoNet!rmplc!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: Fri, 19 Jan 96 20:33:12 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 5
Message-ID: <[e-mail]>
References: <4dkiob$[e-mail]>
NNTP-Posting-Host: bos1d.delphi.com
X-To: Jeff <[e-mail]>

According to Sterba, "A square is always better than a dipole".
 So a square laying on the ground should be
better than a dipole at 100 ft. :-)

73, Cecil, KG7BK, OOTC


From [e-mail] Fri Jan 26 13:40:31 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!atlantis.utmb.edu!news.tamu.edu!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 23 Jan 1996 05:50:32 GMT
Organization: Texas A&M University, College Station, TX
Lines: 80
Message-ID: <4e1sv8$[e-mail]>
References: <4dkiob$[e-mail]> <4dpt7f$[e-mail]> <4e0ok3$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 128.194.44.219
X-Newsreader: IBM NewsReader/2 v1.2

In <4e0ok3$[e-mail]>, [e-mail] (Richard Karlquist) write
s:
>In article <4dpt7f$[e-mail]>,  <[e-mail]> wrote:
>
>>About the only one's you can get to do a nice job with your feet still on th
e
>>ground most of the time are the vertical arrays.  My 4 Rohn 25G 66 foot
>>self supporting towers in a 4 square with a cubic yard of concrete each
>>didn't grow there by themselves, but they do work.
>>
>>Mike W5WQN as a guest at leviathan.tamu.edu
>>
>
>Now that raises some eyebrows!  Rohn 25G is only supposed to be self supporti
ng
>to 30 feet.  Can you explain what you're doing in more detail?
>
>Rick Karlquist N6RK
>[e-mail]

Simple.  Check the book again.  I think the wind load you are looking at is
for a tower with an antenna at the top!

These are six sections of Rohn 25G, the lowest one sunk 3 feet into a
cubic yard of concrete each.  There is a 1 + inch section of galvanized 10 ft.
EMT stinger at the top strapped to each tower for some 6-7 feet more top
height with a slug of stainless steel hose clamps, safetied, for reasonance.

The array has all the radials bonded to the bases.  Of course the tower
sections are solid grounded.  Ufer ground style into the blocks with direct
connections to the radial field sort of solves the lightning problem.

:)

Each tower section is fed with about a 30 odd foot gamma match section
of matching section made from TV twin lead stand-off insulators.  The
top of the gamma match line joins the tower itself at a 45 degree angle
from the top stand off and bonded to the tower just above one of the joints.
The bottom of the gamma match section is reasonated for a forced match
at each tower base by four ARC-13 surplus silver plated brass tuning variable
caps with about at two foot section of RG-8 coax uses in parallel with them
to bring the rand of the caps in line.  Cheap at most ham fests...

Whole array is fed with DX Engineering phase box a-la Collins style.

Tune each tower to exactly the same format with an MFJ combo SWR
and impedance bridge.  They all are perfect matches size wise tower for
tower.  Hook up the phase delay lines,  hook up the line to the shack.

By itself, a vertical fed this way can be brought down to where the needle wil
l
not move off the zero mark, but your total array SWR will not be that good.
I can change the exit impedance with an antenna tuner at the dummy load port
on the phase box and see the F/B ration null, but each lobe is never perfect.

Performance on the 40 meter one is about text book.  6 or so DB forward gain
with anywhere from 25-30+ F/B, however, you will find that the F/B is
really variable depending on the arrival angle of the sigs.  The array can be
optimized for F/B by adjust the spacing and phasing minutely to favor a
higher or lower angle by playing around with MNC by W6TI, which I use,

and really do like and use HEAVILY, paid for, and all,

although I HATE HATE HATE his copy protection that has caused me a LOT
of misery and grief as I change hardware like clothes.

The array just took another round of 70 mph gusts this weekend here in
tornado alley.  The towers move a bit, but there is no spurious reasonance
(mechanically) in the stingers.  They just sulk there.  I've seen more than
70 mph gusts so far, zero deflection, no guys at all......

You'd be wise to be SURE where you puch the holes for the concrete.  If
you miss, it hurts.  I played with a 40 meter version of this for a while,
solid grounded poles with elevated grounded bonded radials up 9 feet before
I got up enough guts to hand dig the holes and pour the concrete.....

Nice neat clean array any girl friend can appreciate too...

Mmmmm...

:)

Mike as a guest at leviathan.tamu.edu



From [e-mail] Fri Jan 26 13:40:33 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 23 Jan 1996 11:48:51 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
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In article <rohrwerk-2201961556420001@10.0.2.15>, [e-mail]
(John Seboldt) writes:

>The half square is a PAIR OF VERTICALS!  Actually a pair of phased
>verticals independent of ground.  The radials of an *excellent* vertical
>will have some effect in helping ground conductivity near the antenna, of
>course, but you will not have the ground losses of a less-than-perfect
>radial system with the half square.

I suspect the half square still has appreciable losses. The flat top wire
radiates in directions other than the desired direction (that certainly
causes losses), and the radiating fields induce current in the lossy
ground below the antenna. There are no radials to "shield" the antenna
from the lossy earth.

I bet these losses are significant.

73 Tom


From [e-mail] Fri Jan 26 13:40:33 1996
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From: [e-mail] (MARKTAINT)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 22 Jan 1996 01:16:52 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
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NNTP-Posting-Host: newsbf02.mail.aol.com

Do you have any high supports? Like a couple 70 foot trees about 140 feet
apart? If so my vote would be for a halfsquare antenna. It's a pair of
qtr. wave vertical wires in phase 1/2 wavelength apart. you feed it in one
of the corners. It works great if it's pointing the direction you want!
Good luck!
Mark, N0YRW


From [e-mail] Fri Jan 26 13:40:34 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 24 Jan 1996 09:27:26 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 19
Sender: [e-mail]
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In article <4e4n45$[e-mail]>, [e-mail] writes:

>
>That lead to my plea for help on what to do in some way to somehow tune
>it out of inferometrence, to coin a word here.
>
>

We corrected this type of problem all the time at BC stations. The correct
way to detune the tower is to put a capacitor across a vertical area of
the tower, and adjust it for minimum current in the tower above or below
the trap. You may need multiple traps along the tower, but it's a lot
easier than moving the tower.

I use that method here at the present time, and I used that system on
hundreds of BC towers and structures like power poles that were causing
pattern distortion when I was doing BC antenna work.

73 Tom


From [e-mail] Fri Jan 26 13:40:36 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 24 Jan 1996 07:29:09 GMT
Organization: Texas A&M University, College Station, TX
Lines: 59
Message-ID: <4e4n45$[e-mail]>
References: <4dpt7f$[e-mail]> <4e3hhk$[e-mail]>
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NNTP-Posting-Host: 128.194.44.219
X-Newsreader: IBM NewsReader/2 v1.2

In <4e3hhk$[e-mail]>, [e-mail] (W2FOE) writes:
>I agree with Mike 80 Meter DX antennas are work.  l too have a 4square
>array and while the dollar cost was relatively cheap, I estimate that I
>have about 400 hours in it.  However, it does work and I'm not worried
>about wind and ice taking it down.  Mike is right on another count too -
>they take a lot of space.  The four square with its radials takes up
>approximately 1 acre (roughly 200' by 200' and if I were doing it again I
>would increase the spacing).  Everything interacts with it.  I once
>thought I wwas being very clever and put up a 160 meter inverted L in the
>middle of the 4 square and tied it to the same ground system.  Seemed like
>a great idea at the time, but the 4square never worked again until I took
>it down.
>
>Good luck, and if you find one that's easy let us all know.
>
>Regards, Merv

Despite my anger at 6STI for the copy protection, I really DO use the product
and depend on it.  You are right BIG time on the damage to the pattern of
the array by chunking something in the middle of it.  I, very wrongly, thought

instinctively that in the middle was the safest place to put a 200 foot tower.

Instinct is what a skunk does under your house when you run one under there
and shoot it there too because you didn't do the job right out in the fairway
the first time!

I lost a nice girl friend in high school doing that, however her dad couldn't
say much.  He is the one who insisted I use his 22 instead of my shotgun,
even furnished the shells from his pocket that night.  It died right under the
ir
coat closet at the front porch where all their fur coats were hanging.

:)

That fiasco, on the screen of course, lead me to plunking the tower all over
creation trying to get rid of the pattern distortion.   Gee, on 80, if you hav
e
about 600 feet to spare in separation, the pattern settles down somewhat.

That lead to my plea for help on what to do in some way to somehow tune
it out of inferometrence, to coin a word here.

Frank Donovan W3LPL, came to my aid here in the group, suggesting a
forced reasonance of the higher tower with a mid point long wire, somewhat
like your errant 160 meter inverted L, but with a devious plot in mind,
pun intended.

I'm toying with the plots when I can wrench time away from all the other
work, with MNC, to see exactly how to detune this glorious propsed new
200 foot rotating tower nighmare.

Plus,

if I ever can muster up the funds for a full sized 4 square transmitting
array on 160, you can bet I won't place it ANYWHERE, except in the back
forty, after watching MNC make fun of my instincts.

:)

Mike W5WQN as a guest at leviathan.tamu.edu



From [e-mail] Fri Jan 26 13:40:37 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 26 Jan 1996 06:43:07 GMT
Organization: Texas A&M University, College Station, TX
Lines: 54
Message-ID: <4e9t5r$[e-mail]>
References: <4e76fb$[e-mail]> <4e8l64$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 128.194.44.219
X-Newsreader: IBM NewsReader/2 v1.2

In <4e8l64$[e-mail]>, [e-mail] (W8JI  Tom) writes:
>In article <4e76fb$[e-mail]>, [e-mail] writes:
>
>
>I'm a bit puzzled by all that. If the horiz wire is 1/2 wave long , any
>effect of tying it to the center will be minimized and highly dependent on
>the reesonant frequency and L/D ratio of the wire. Think about it, it is a
>very high impedance end fed wire that has a large impedance variation
>around resonance.

No, his suggestion was to conside the distance to the botom ** or ** to the
top, including the horizontal stub wire as the 1/2 wave length, not just
the length to the tiew point.  That, per his suggestion, forces the tower
out of the picture as a tuned complete unit outside the range of problems!

>
>On the other hand, a 1/4 wave wire will have a more gradual impedance
>variation less dependent on L/D ratio, and a much lower impedance at the
>tie point!

I think I understand this.

>If the proper design de-tuning system is employed, the BW is reasonable
>and it is not readily detuned. BW becomes poor if too small a capacitor is
>used, or if a large area of the pole is tuned. Better to tune two or three
>small areas! I did installations that remained in tune for years, and even
>Big Bird from Sesame St wouldn't bother em.

I never tried multiple segments.  I can see where that would help.  I do
understand that a reasonable balance between L and C is required to make
the system work well.

>Now if I wanted a real "broad-band" de-tuning here's what I would do. I'd
>run out and buy a gross split ferrite cores, and clamp a stack of 'em
>around the legs at every tower section junction. I'd use a core that had
>as much impedance as I could find within the limitation of maintaining a
>reasonable Q at the operating frequency, certainly Q>5.

Now THAT is a novel idea!

>
>More on the rest later.
>

Please do, if you will!


Mike as a guest at leviathan.tamu.edu








From [e-mail] Fri Jan 26 13:40:38 1996
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From: [e-mail] (Geert Pirens)
Newsgroups: rec.radio.amateur.antenna
Subject: WANTED schematic of a IF-100 interface
Date: Thu, 25 Jan 1996 00:53:22 GMT
Organization: PING Belgium
Lines: 8
Message-ID: <4e6k85$[e-mail]>
NNTP-Posting-Host: dialup37.hasselt.eunet.be
X-Newsreader: Forte Free Agent 1.0.82


Can someone help me on a schematic of an IF-100 interface ?

All information is welkom !

Geert Pirens,ONL2057




From [e-mail] Fri Jan 26 13:40:39 1996
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From: [e-mail] (Gary Myers)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Why is man-made RFI vertically polarized?
Date: Fri, 26 Jan 1996 00:51:33 GMT
Organization: Self
Lines: 25
Message-ID: <4e98jh$[e-mail]>
References: <4e8qfj$[e-mail]>
NNTP-Posting-Host: gmyers.pr.mcs.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Stephen G. Roseman) wrote:

>       In the ARRL General Class study guide (and I've seen it other places)
>is a statement the "man-made interference is usually vertically polarized".

>       In 25 words or less, anyone know why?

>Thanks,
>Steve, N3WHW

>----------------------------------------------------------------------------
>Steve Roseman
>Lehigh University Computing Center
>[e-mail]

Gauss' law requires that the electric field must always be
perpendicular to a conductor. Since manmade rfi usually arrives by
ground wave (as opposed to skip), the electric field is perpendicular
to the conducting earth, i.e., vertically polarized.

Ok, ok, that's more than 25 words...

Gary K9CZB
[e-mail]



From [e-mail] Fri Jan 26 13:40:41 1996
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From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: wire antenna impedances
Date: 23 Jan 1996 19:25:27 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 39
Distribution: world
Message-ID: <4e3cn7$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

Many people have asked how to estimate the impedance of a
center-fed wire antenna without antenna modeling software.
I don't know if anybody else has posted anything on that
subject, but here is what I found based on a 10MHz half-
wavelength dipole, 46.8 ft long, 30 ft high, fed with 300
ohm ladder-line. The following Smith chart is normalized
to 300 ohms so multiply every point by 300 to get an
approximate antenna impedance. The data points were generated
using ELNEC.

Get a Smith Chart. Draw a circle centered at 1.4-j0.2 and
passing through 0.33+j0. Label the 0.33+j0 point as odd-
half-wavelengths. Label the 14.0+j0 point as even-half-
wavelengths. Draw an arc centered at 1.6-j0.6 from 0.33+j0
down to the boundary at 0-j1.4. Draw a line straight down
from the center 1.0+j0 to 0-j1.0 and label point 0.1-j1.0
as the 3/8 wavelength point.

From an odd-half-wavelength, increasing the length will take
you in a clockwise direction, i.e. inductive. Decreasing the
length will take you in a counter-clockwise direction, i.e.
capacitive.

This is a conceptual aid, not a very accurate representation.
All odd-half-wavelength values come out at 100 ohms resistive.
All even-half-wavelength values come out at 4200 ohms resistive.
_These are only approximations_ and will indicate approximately
what your balun and antenna tuner are up against for center-
fed wire antennas. Remember, the impedance values read from the
chart are for the antenna and are transformed by the length of
the 300 ohm ladder-line which I have measured at a velocity
factor of 0.8  Note that half way around the above chart is
a half-wavelength which is different from a normal Smith chart.

In general, we want our baluns and antenna tuners to see values
on the left-central side of the chart, rather than on the far
right, far top, far bottom, or far left. Hope this is helpful.

73, Cecil, KG7BK, OOTC  (Not speaking for my employer)


From [e-mail] Fri Jan 26 13:40:41 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!fdurt1.fdu.edu!xyzzy.bubble.org!newshost.cyberramp.net!news.iadfw.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!nntp-trd.UNINETT.no!telepost.no!statoil!fou.tr.statoil.no!trm
From: [e-mail]
Subject: Wizard antenna for 80m
Message-ID: <[e-mail]>
Keywords: Cramped space solution.
Sender: [e-mail]
Nntp-Posting-Host: 143.97.83.112
Organization: Statoil R&D, Trondheim, Norway.
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Date: Tue, 23 Jan 1996 14:39:15 GMT
Lines: 4

I have 21m free horizontal space available. You clever guys out there figure
out an optimum antenna design for 80m DX-ing. I supply 100w costly HF power.
Good luck!
LA7WWJA Tormod Hals


From [e-mail] Fri Jan 26 13:40:43 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Wizard antenna for 80m
Date: 24 Jan 1996 07:39:59 GMT
Organization: Texas A&M University, College Station, TX
Lines: 39
Message-ID: <4e4nof$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 128.194.44.219
X-Newsreader: IBM NewsReader/2 v1.2

In <[e-mail]>, [e-mail] writes:
>I have 21m free horizontal space available. You clever guys out there figure
>out an optimum antenna design for 80m DX-ing. I supply 100w costly HF power.
>Good luck!
>LA7WWJA Tormod Hals

Use a GIANT coaxial shield vertical, just like a huge expansion of the ones
you see in the handbooks for 2 meters.

Put about three yards of concrete down to make it self supporting, with no
guys.

Go up with heavy enough tower to make the self supporting tower.

Make your coaxial sleeve on the outside out of a ring of vertical wires,
sort of like around bicycle wheels for spacers mounted on spacers on
the tower.  Minimizes wind loading.

You feet the upper active element at the mid point, like the gap.

Unlike what I see posted here about the Gap and it not liking 100 MPH
winds too well, you can control the project so it will survive whatever.

It will get out just fine.

About a hundred square feet of land space is all you need.

:)

Variations on this theme of insanity, etched by the afforability of your
pocketbook and your willingness to consume a bit more ground space,
such as the conical monopole and the like, will do about as well for you.

They say in defensive driving school that humor is the best teacher.

To low band DX - on a small lot - with low power...

Mike W5WQN as a guest at leviathan.tamu.edu



From [e-mail] Fri Jan 26 13:40:44 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Wizard antenna for 80m
Date: 25 Jan 1996 06:49:42 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 31
Sender: [e-mail]
Message-ID: <4e7qom$[e-mail]>
References: <4e4nof$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail]
writes:

>I have 21m free horizontal space available. You clever guys out there
figure
>out an optimum antenna design for 80m DX-ing. I supply 100w costly HF
power.
>Good luck!
>LA7WWJA Tormod Hals
>

I recommend a "dipole" antenna as high in the air and as long as it can
be. Feed it with open wire line dropped vertically straight down to a
tuner. Bring as many radials as you can to the tuner from all directions.

If you tie the feeders together and load the antenna as a "T" against
ground on 80 and 160, it will be a top loaded vertical. If you connect the
antenna in a normal dipole configuration it will work well on the higher
bands.

Use a good ground system with plenty of straight radials. Make the radials
as long as space allows. The feedline should drop vertically to the ground
and be away from other objects. The tuning system should be at the ground
connection if possible.

I've used a system like this on 160 through 10 meters, and worked a lot of
DX. It is inexpensive, serves multiple uses, and works very well on all
bands.

73,
Tom


From [e-mail] Fri Jan 26 13:40:45 1996
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From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
Date: 22 Jan 1996 01:49:34 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 10
Distribution: world
Message-ID: <4duqfe$[e-mail]>
References: <4dpris$[e-mail]> <4dr03e$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

In article <4dr03e$[e-mail]>,
W8JI  Tom <[e-mail]> wrote:

>1.) A bottle of saltwater for a ground. Run wires from the rig into the
>bottle, and throw some pennies in the bottle to improve the ground.

Hey Tom, there's nothing wrong with this advice as long as you
have a very biiigggg bottle and lots and lots of pennies. :-)

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From [e-mail] Fri Jan 26 13:40:45 1996
Path: news.epix.net!news.sprintlink.net!news.mcn.net!blpm01-195
From: [e-mail] (Vince Fiscus,  KB7ADL)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
Date: Wed, 24 Jan 96 00:13:58 GMT
Organization: Montana Communications Network
Lines: 4
Message-ID: <4e3tkn$[e-mail]>
References: <4dpris$[e-mail]> <4dr03e$[e-mail]> <[e-mail]>
NNTP-Posting-Host: blpm01-195.mcn.net
X-Newsreader: News Xpress Version 1.0 Beta #4


A broken coax. Cuts down on neighborhood QRN.  ;-)




From [e-mail] Fri Jan 26 13:40:46 1996
Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
Date: 24 Jan 1996 01:35:57 GMT
Organization: SRC
Lines: 19
Message-ID: <4e42eg$[e-mail]>
References: <4dot60$[e-mail]>
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

Whats the BEST coax...

Try Andrew 4" Heliax with type "N" connectors.

Good, but seriously, use the lowest loss coax you can find.

9913 is good, but I've reciently see some other promising stuff.

Don't believe the trash about thick wire needing power.

On the other hand, a 30 foot run of almost anything is good enough.

So, if your looking for that last .1 db savings,,, use real low loss
cable, the bigger the better.

Tom
WA1RHP




From [e-mail] Fri Jan 26 13:40:47 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
Date: Thu, 25 Jan 96 21:24:48 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 8
Message-ID: <[e-mail]>
References: <4dpris$[e-mail]> <4dr03e$[e-mail]> <[e-mail]>
NNTP-Posting-Host: bos1d.delphi.com
X-To: <[e-mail]>

<[e-mail]> writes:

>that he "gets out better now" since he replaced his mike cable with RG-8.
>

Hi Terry, could be his old mike cable was shorted out. :-)

73, Cecil, KG7BK, OOTC


From [e-mail] Fri Jan 26 13:40:48 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!imci4!imci5!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Steve Shumway )
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
Date: 26 Jan 1996 01:37:35 GMT
Organization: Netcom
Lines: 25
Message-ID: <4e9b8v$[e-mail]>
References: <4dpris$[e-mail]> <4dr03e$[e-mail]>
NNTP-Posting-Host: akr-oh3-23.ix.netcom.com
X-NETCOM-Date: Thu Jan 25  5:37:36 PM PST 1996

In <4dr03e$[e-mail]> [e-mail] (W8JI  Tom)
writes:

>
>Boy, I'll second that. If you want to learn something the wrong way,
learn it from an expert on CB! Some of the neat things I've heard over
the years from CB'ers are:
>
{snip}
>
>Did I miss anything?????

Never put a lead acid battery directly on a cement floor, it will go
dead. Always put it on a couple of 2*4's

Hot water will freeze before cold water

I'm sure there are many more. Might be fun to start a colection.

TNX de N8SHP

Steve Shumway
[e-mail]




From [e-mail] Fri Jan 26 13:40:48 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
Date: 24 Jan 1996 17:41:10 -0500
Lines: 13
Message-ID: <4e6ci6$[e-mail]>
NNTP-Posting-Host: ns1-1.cc.lehigh.edu

>Try Andrew 4" Heliax with type "N" connectors.

right....like a CBer has enough money for that!! :)
besides, i beat the reply to him....i said 5" :-P~

DAvid
|-----------------------------------------------------------------------|
|         David Roseman       |          [e-mail]       OUTTA ORDER!
|      SysOp of NODE 3 BBS    |          The Flying HAm - BBS    |      |
|     Running OBV/2 Software  |          Technomage - BBS        |      |
|                             |          N3SQE/1     - HAm       V      |
|                             |  [e-mail] - Packet  |
|-----My AWESOME home page :) http://www.lehigh.edu/~c002/c002.html-----|


From [e-mail] Tue Jan 30 16:13:36 1996
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From: [e-mail] (James Lyons)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: ***ONE OF THE BEST HAM WEB PAGES ON THE INTERNET. TRY IT OUT!!***
Date: 22 Jan 1996 13:49:59 -0500
Organization: Communications Accessibles Montreal, Quebec Canada
Lines: 24
Message-ID: <4e0m8n$[e-mail]>
References: <4dk7io$[e-mail]> <4dlre7$[e-mail]>
In-Reply-To: <4dlre7$[e-mail]>
MIME-Version: 1.0
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Xref: news.epix.net rec.radio.amateur.misc:97408 rec.radio.amateur.antenna:18711 rec.radio.amateur.digital.misc:13825 rec.radio.amateur.equipment:24270 rec.radio.amateur.homebrew:13004 rec.radio.amateur.policy:32834 rec.radio.amateur.space:6217



On 18 Jan 1996, Ken Durham wrote:

> In article <4dk7io$[e-mail]>, [e-mail] says...
> >
> >Hello all:
> >
> >      In the last message that I sent over usenet I forgot to include my
> >url for my web site. The URL is "http://www.dfw.net/~dmclean".
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
`
> I tried this URL yesterday and again this morning with no results. Netscsape
> keeps contacting the host forever. Please try your page from another site an
d
> see if it can be accessed.
>
> Ken Durham K5MBV  [e-mail]
>
>
>
I had no problem accessing it yesterday (Sunday) afternoon, twice ...
once via Netscape and once via Lynx.

Jim Lyons



From [e-mail] Tue Jan 30 16:13:37 1996
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!torn!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Sterba again
Date: 22 Jan 1996 16:52:38 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 33
Sender: [e-mail]
Message-ID: <4e10v6$[e-mail]>
References: <4dtvba$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4dtvba$[e-mail]>, [e-mail]
(Cecil A. Moore~) writes:

>So my 88ft EDZ centerfed *is* a "dipole" on 20m because of the two
>broadside major nodes but not a "dipole" on 17m where it has a
>4-lobbed clover-leaf pattern?

That is correct it is NOT a 17m dipole antenna. It is a 20m collinear
dipole even when used on 17m. Or a 5.3 MHz dipole antenna on all bands,
even when you use it on 160 or 2 meters, and for receiving or
transmitting. The point is, a dipole antenna does NOT need to have only
"two poles", it can have hundreds of electrical poles and still be a
dipole antenna if the phase is correct. Unless the IRE's definition of
antenna terms and engineering textbooks are incorrect.

>The confusing part for me is during receive. The antenna doesn't
>know what frequency the receiver is tuned to or even if the
>receiver is powered up or not. How does it know whether to be
>a dipole or not during non-transmitting times? If I'm not home
>and you drive by my house, would you say I had a dipole or not?
>I can buy how using it during transmit can change its definition.
>I have trouble accepting that thinking about it can change its
>definition. If only that worked with girlfriends. :-)

Only after a few beers, in both cases! The confusion comes from using the
abbreviated name. For instance, I used to date a gal by the name of Cheryl
Teagues. If I just called her Cheryl, no one could form a mental picture
of who I was talking about. If I used her abbreviated name "Cher", the
picture was further confused. It didn't matter if I was speaking of her in
terms of receiving or transmitting something, at least not for a week or
two.

73 Tom


From [e-mail] Tue Jan 30 16:13:38 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 22 Jan 1996 19:30:11 GMT
Organization: Hewlett-Packard
Lines: 15
Message-ID: <4e0ok3$[e-mail]>
References: <4dkiob$[e-mail]> <4dpt7f$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4dpt7f$[e-mail]>,  <[e-mail]> wrote:

>About the only one's you can get to do a nice job with your feet still on the

>ground most of the time are the vertical arrays.  My 4 Rohn 25G 66 foot
>self supporting towers in a 4 square with a cubic yard of concrete each
>didn't grow there by themselves, but they do work.
>
>Mike W5WQN as a guest at leviathan.tamu.edu
>

Now that raises some eyebrows!  Rohn 25G is only supposed to be self supportin
g
to 30 feet.  Can you explain what you're doing in more detail?

Rick Karlquist N6RK
[e-mail]


From [e-mail] Tue Jan 30 16:13:39 1996
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!news.uoregon.edu!news.u.washington.edu!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.tc.cornell.edu!caen!spool.mu.edu!howland.reston.ans.net!psinntp!psinntp!psinntp!news1.h1.usa.pipeline.com!usenet
From: [e-mail](Dave Malley)
Newsgroups: rec.radio.amateur.antenna
Subject: MOSLEY TA34M Question
Date: 24 Jan 1996 00:22:37 GMT
Organization: Pipeline USA
Lines: 8
Message-ID: <4e3u4d$[e-mail]>
NNTP-Posting-Host: pipe10.h1.usa.pipeline.com
X-PipeUser: dmalley
X-PipeHub: usa.pipeline.com
X-PipeGCOS: (Dave Malley)
X-Newsreader: Pipeline USA v3.4.0

Does anyone have experience with the TA34M and/or TA34XL that would favor
one antenna or the other? Any difficulties with erecting the TA34M (a
modified TA33) or it's performance?

Thx a lot!

Dave, K1NYK
[e-mail]


From [e-mail] Tue Jan 30 16:13:40 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs
From: [e-mail] (Robert Smits)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: need info:  5/8 wave 2m/70cm antenna
Message-ID: <[e-mail]>
Date: Wed, 24 Jan 1996 21:23:00 PST
References: <4e3l0k$[e-mail]>
Reply-To: [e-mail]
Distribution: world
Organization: The Curmudgeon's Cottage
X-Newsreader: Rnf 0.79b6
Lines: 23

Al Wong <[e-mail]> writes:

>Has anyone any recommendations for a good 5/8 wave 2m/70cm
>mobile antenna?
>
>Only one stumping block....The car is corvette, thus mag/trunk
>mounts are out of the picture.
>
>Is my only other choice a window mount antenna?
>

Nope. Larsen has a 2m-70cm antenna that uses a half wave element for 2
metres and collinear elements for 70cm - and doesn't need a ground plane,
according to Larsen.

The NMO-2/70 uses the Motorola style mount (3/4 " hole) and the NLA-2/70
uses the 3/8 " hole mount.

I haven't used it myself, although I've been very happy with individual
Larsen VHF and UHF mobile antennas.

--
[e-mail]   (Robert Smits, VE7HS)


From [e-mail] Tue Jan 30 16:13:41 1996
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.monmouth.com!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!usenet
From: [e-mail] (Thilo Kootz)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ?impedance of longwire?
Date: Thu, 25 Jan 1996 01:03:18 GMT
Organization: Regional Computing Center, University of Cologne
Lines: 5
Message-ID: <4e6kqr$[e-mail]>
References: <4dg7m7$[e-mail]> <4dqdho$[e-mail]> <4e34va$[e-mail]>
NNTP-Posting-Host: annexr2-9.slip.uni-koeln.de
X-Newsreader: Forte Free Agent 1.0.82

Thanks to all who helped me.
Question was answerd sufficiently.
73 thilo




From [e-mail] Tue Jan 30 16:13:42 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcomsv!uu3news.netcom.com!netcomsv!uu4news.netcom.com!infosphere.com!usenet
From: Norm Hammar <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: hidden antenna
Date: Thu, 25 Jan 1996 06:35:49 -0700
Organization: CQG
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: rofpop19.infosphere.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)

I live in a subdivision that prohibits antennas. Does anyone have any
plans for an HF (80-10 meter) antenna that would be inobtrusive? EMail
to [e-mail]


From [e-mail] Tue Jan 30 16:13:43 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!news.moneng.mei.com!sol.ctr.columbia.edu!news.mindlink.net!van-bc!news.rmii.com!usenet
From: [e-mail] (Eugene L. Olson)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Need 16' vertical; easy breakdown/collapsable
Date: Thu, 25 Jan 1996 07:29:35 GMT
Organization: Rocky Mountain Internet Inc.
Lines: 20
Message-ID: <4e7beq$[e-mail]>
References: <4dmhqr$[e-mail]>
NNTP-Posting-Host: slip8141.rmii.com
X-Newsreader: Forte Free Agent 1.0.82

Why not just use a center fed 20 meter dipole and hang it from a tree
in the vertical configuration?

kc0rl, "Ole"
------------------------------------------------------------------------------
--------------------

[e-mail] (richard l wilder k3di) wrote:

>I need a 16' vertical that is easy to break down or can be collapsed.
<Snip>

>73, Dick Wilder, K3DI   (ZF2OP QRP in ARRL CW contest next month.)

====================================================
Eugene L. Olson, "Ole"   - Amateur Radio Call: KC0RL
Internet: [e-mail] - Packet Radio: KC0RL@W0LKD
====================================================





From [e-mail] Tue Jan 30 16:13:44 1996
Path: news.epix.net!uunet!in2.uu.net!cs.utexas.edu!news.ti.com!usenet
From: Joseph Fitter  BV/N0IAT <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Source of Al tubing?
Date: 25 Jan 1996 09:31:37 GMT
Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C.
Lines: 19
Message-ID: <4e7ilp$[e-mail]>
References: <[e-mail]> <4dkm3v$[e-mail]>
NNTP-Posting-Host: 137.167.36.115
Mime-Version: 1.0
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X-Mailer: Mozilla 1.1N (Windows; I; 16bit)


>>I'm looking for a source of Al tubing to build some antennas. Any
>>suggestions?
>>ttfn fiz (KG0YG)
Texas Towers in Plano, TX sells AL tube in many sizes. See details in
>QST/CQ/73 mags.
>Marty Albert (Amatuer Radio Station KC6UFM)
>Fredericktown, MO USA


I might add that the fine folks at Texas Towers shipped me a bunch of
Aluminum when I was living in Tokyo, Japan.  They worked out all the
shipping details etc.  Wasn't cheap, but after a typhoon tore heck outta
the antenna, it was worth the price to fix it "better than new".

73  Joe

BV/N0IAT  ex 7J1AOF



From [e-mail] Tue Jan 30 16:13:44 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!spool.mu.edu!pravda.aa.msen.com!fu-berlin.de!news.dfn.de!news.ruhr-uni-bochum.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GAP Titan DX Vertical Antenna
Date: 25 Jan 1996 10:01:48 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 9
Message-ID: <4e7kec$[e-mail]>
References: <4e0vvv$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>The GAP folks (as I guess you know) say you can mount
>it either about 8' off the ground on a metal pipe, or at rooftop,
>with no difference in performance.

... and with no difference in performance if you operate it lying in its
box just next to your rig. Judging by GAP's claimed efficiency they do not
have the faintest clue about antenna performance.

73, Moritz DL5UH


From [e-mail] Tue Jan 30 16:13:46 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!nntp.net-link.net!news
From: "Steven F. Johnson" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Safety concerns: Info needed on antenna mooring
Date: Thu, 25 Jan 1996 10:44:40 -0500
Organization: NetLink Systems, LLC.
Lines: 24
Message-ID: <[e-mail]>
References: <4du131$[e-mail]>
NNTP-Posting-Host: lorien.net-link.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6a (Win95; I)

A local business now owns a property on which a Rohn (?) 110G antenna
was previously erected.  This is a 110' antenna, with three sets of 3
guy wires.  The owner wants to remove the guy wires and fasten the
antenna somehow to his building instead, so he doesn't have to worry
about cars or trucks hitting the pylons or wires.  He's not using the
antenna right now.

This seems to me to be pretty unwise - if the guy wires weren't needed,
they wouldn't be there.

My questions:

* Is Rohn the right company? (I heard "Roland" - but it could be Rollan
or Rohn)

* Is there a resource for information on antenna mooring systems that I
can get to on the Net?

* What is the approximate replacement cost for a 110' antenna tower?
(The neighbors might get together and buy it from him to get him to take
it down safely)

I don't visit this newsgroup often, so any replies to my e-mail address,
[e-mail], would be greatly appreciated.


From [e-mail] Tue Jan 30 16:13:46 1996
Path: news.epix.net!news.sprintlink.net!mhv.net!netaxs.com!news.cais.net!news.cais.com!cais3.cais.com!gttm
From: USCG TELECOMMS <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: W9INN Multi-band dipoles
Date: Thu, 25 Jan 1996 13:55:24 -0500
Organization: Capital Area Internet Service [e-mail] 703-448-4470
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: cais3.cais.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]

Does anyone have experience with the Hi-Performance Dipoles, such as the
HPD-3 160-80-40 dipoles?  I'm looking for something with low SWR that
would not require use of a tuner to cover the three top bands.

Thanks.


From [e-mail] Tue Jan 30 16:13:47 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!news.Stanford.EDU!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 25 Jan 1996 14:10:22 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 24
Sender: [e-mail]
Message-ID: <4e8kiu$[e-mail]>
References: <4e1sv8$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4e1sv8$[e-mail]>, [e-mail] writes:

>
>These are six sections of Rohn 25G, the lowest one sunk 3 feet into a
>cubic yard of concrete each.  There is a 1 + inch section of galvanized
10
>ft.
>EMT stinger at the top strapped to each tower for some 6-7 feet more top
>height with a slug of stainless steel hose clamps, safetied, for
reasonance.
>
>

You probably noticed the "stinger" only makes the most minor change in
resonant frequency. I'd like to highlight that point!

The change from a large diameter lower section terminating in a small pipe
is the root of the problem. With a 100 foot base insulated (series fed)
tower on 160, the addition of a 40 foot "stinger" moved the resonant
frequency less 40 kHZ!!!!  The stinger must be the same capacitance per
foot as the tower to have the same height effect as adding the same
percentage of tower height.

73 Tom


From [e-mail] Tue Jan 30 16:13:48 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 25 Jan 1996 14:20:36 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 50
Sender: [e-mail]
Message-ID: <4e8l64$[e-mail]>
References: <4e76fb$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4e76fb$[e-mail]>, [e-mail] writes:

>Frank suggested another way of doing this that used a multiple of a half
>wave wire tied to the center point of the offending pole.  He said that
>properly chosen as to tap point, so as to split the tower equally,
>electrically,
>above and below the tap point, it was possible to force the tower out of
>the pattern of the other array.  He said they do that at the W3LPL site,
as
>opposed to the traditional capacitor tuning method, because it turns out
to
>be far broader in frequency range as to the tuning.   He says that the
use of
>
>the variable cap to tune a segment of the tower is so narrow in frequency

>range that it makes it difficult to protect an antenna for the full 80
meter
>band using this method.  The other one works better, he claims.
>
>

I'm a bit puzzled by all that. If the horiz wire is 1/2 wave long , any
effect of tying it to the center will be minimized and highly dependent on
the reesonant frequency and L/D ratio of the wire. Think about it, it is a
very high impedance end fed wire that has a large impedance variation
around resonance.

On the other hand, a 1/4 wave wire will have a more gradual impedance
variation less dependent on L/D ratio, and a much lower impedance at the
tie point!

If the proper design de-tuning system is employed, the BW is reasonable
and it is not readily detuned. BW becomes poor if too small a capacitor is
used, or if a large area of the pole is tuned. Better to tune two or three
small areas! I did installations that remained in tune for years, and even
Big Bird from Sesame St wouldn't bother em.

Now if I wanted a real "broad-band" de-tuning here's what I would do. I'd
run out and buy a gross split ferrite cores, and clamp a stack of 'em
around the legs at every tower section junction. I'd use a core that had
as much impedance as I could find within the limitation of maintaining a
reasonable Q at the operating frequency, certainly Q>5.

More on the rest later.

73 Tom





From [e-mail] Tue Jan 30 16:13:49 1996
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!pacbell.com!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.oanet.com!usenet
From: ve6dvp <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: CQ: All HF remote base users..............
Date: 25 Jan 1996 17:03:36 GMT
Organization: YCS Internet
Lines: 8
Message-ID: <4e8d58$[e-mail]>
References: <4dttam$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 204.209.114.52
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

We`re using a Kenwood TS 680 with a GAP antenna, good RX and TX. Tuning
was simple  and it stands up well to weather conditions here- we
have60+mph winds and heavy snow and ice conditions . Control is via DTMF
thru a Link-Comm RLC-2with expander board. Only problem is not enough
control lines  to be able to remotely switch HF-6 meter antennas, however
we are in process of setting up remote switching by packet. 73`s
Don(VE6DVP)



From [e-mail] Tue Jan 30 16:13:51 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci4!imci5!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!nntp-trd.UNINETT.no!Norway.EU.net!oslonett.no!sn.no!newsfeed.tip.net!dataphone!news.redshift.com!usenet
From: Orrin Winton <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Rhombic antenna designer for windows
Date: Thu, 25 Jan 1996 17:24:39 -0800
Organization: Redshift Online Service
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My "rhombic utility" for windows 3.1, version 2.04, is available from
my ftp site.  See details on my web page listed below.  This program
will design rhombics for HF and VHF and, among other things, give you
dimensions in meters (xyz coordinates in meters) for inputting into
an analysis program like EZNEC.

--

         [e-mail]           http://www.redshift.com/~orrin

 "Our uncle thought he was a chicken, but the family never would take
  him to the doctor for psychiatric treatment."  "Oh, why was that?"
 "Well, it's cuz they needed the eggs."


From [e-mail] Tue Jan 30 16:13:52 1996
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From: [e-mail] (William Michels)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 72 ohm twin lead
Date: 25 Jan 96 18:42:01 GMT
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     72 ohm transmitting twin lead was available last year from at least
     one source in the US. It consists of two No. 13 AWG stranded copper
     conductors spaced VERY close together and insulated . This is similar
     to the transmission line specified by G5RV in his original article,
     "An Effective Multi-Band Aerial of Simple Construction," RSGB
     Bulletin, July 1958.

     This is distinct from 72 ohm receiving twin lead, which uses smaller
     diameter conductors. The transmitting variety has similar loss
     characteristics to RG-8 at 7 MHz and below. Losses increase above 7
     Mhz.

     The source for this transmission line is The RF Connection in
     Gaithersburg, MD. They can be reached at 1-301-840-5477 (inquiries) or
     1-800-783-2666 (orders). They said it was a revival of the older
     Belden 8210 transmission line.



     Disclaimer: I have no affiliation with The RF Connection.

     Best Regards,

     Bill Michels
     [e-mail]




From [e-mail] Tue Jan 30 16:13:53 1996
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From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Material for Vertical
Date: 25 Jan 1996 19:02:35 GMT
Organization: ELNEC/EZNEC Software
Lines: 35
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>   [e-mail] (George McCrary) writes:
>  Hello,
>
>       I'm planning on consturcting a 40M 1/4 wave vertical in the woods
>  behind my house. I have a wire vertical already and would like to make
>  this one self-supporting (or at least not supported from above).
>
>       Any suggestions for materials? Aluminium tubing is available in 6 foot
>  lengths and can be nested. What would the minimum size to use be? What
>  about TV mast? Conduit?
>
>       Any suggestions would be appreciated.
>
>                                       73 DE KQ4QM (George)
>
>  Please E-mail direct, my news server misses a lot of posts!

I've had four self-supporting 40 meter verticals in my back yard for
over 10 years now, and they've survived a couple of really strong
windstorms. They're made from 6061-T6 aluminum tubing of 1-1/4, 1-1/8,
and 1" diameter, nested. Our soil is clay, and I drove 8' galvanized
steel chain link fence end posts 4' into the ground. Using slices from
heavy wall PVC pipe for insulation, the verticals are clamped to the
line posts with muffler clamps. My experience is that the aluminum
tubing that you buy at home improvement stores is much too flexible
for this use. I haven't tried other materials.

There have been postings on this newsgroup fairly recently about where
to get good aluminum tubing.

Good luck!

73,
Roy Lewallen, W7EL



From [e-mail] Tue Jan 30 16:13:54 1996
Newsgroups: rec.radio.amateur.antenna
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From: Coen Waasdorp <[e-mail]>
Subject: Re: GAP Titan DX Vertical Antenna
X-Nntp-Posting-Host: ldn98-21.leiden.nl.net
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 <4e7kec$[e-mail]>
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In article <4e7kec$[e-mail]>, moritz@ipers1.e-
technik.uni-stuttgart.de writes
>>The GAP folks (as I guess you know) say you can mount
>>it either about 8' off the ground on a metal pipe, or at rooftop,
>>with no difference in performance.
>
>... and with no difference in performance if you operate it lying in its
>box just next to your rig. Judging by GAP's claimed efficiency they do not
>have the faintest clue about antenna performance.
>
>73, Moritz DL5UH

Moritz,

I cannot completely agree with you. Working from PA country to VK, JA,
LU, ZS and getting signal reports which do not greatly vary from the
ones I give on 20 mtrs and higher to those operating two, three element
quads, mono beams etc, does seem to indicate that some radiation is
taking place.

With the limited amount of space the GAP Titan DX is using, which for
some of us is of great importance, I have not yet found a better working
alternative.

73

--
Coen Waasdorp
PA0COE


From [e-mail] Tue Jan 30 16:13:55 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 26 Jan 1996 06:56:35 GMT
Organization: Texas A&M University, College Station, TX
Lines: 68
Message-ID: <4e9tv3$[e-mail]>
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In <4e8kiu$[e-mail]>, [e-mail] (W8JI  Tom) writes:
>In article <4e1sv8$[e-mail]>, [e-mail] writes:
>
>>
>>These are six sections of Rohn 25G, the lowest one sunk 3 feet into a
>>cubic yard of concrete each.  There is a 1 + inch section of galvanized
>10
>>ft.
>>EMT stinger at the top strapped to each tower for some 6-7 feet more top
>>height with a slug of stainless steel hose clamps, safetied, for
>reasonance.
>>
>>
>
>You probably noticed the "stinger" only makes the most minor change in
>resonant frequency. I'd like to highlight that point!
>
>The change from a large diameter lower section terminating in a small pipe
>is the root of the problem. With a 100 foot base insulated (series fed)
>tower on 160, the addition of a 40 foot "stinger" moved the resonant
>frequency less 40 kHZ!!!!  The stinger must be the same capacitance per
>foot as the tower to have the same height effect as adding the same
>percentage of tower height.
>


I didn't check the case for length vs frequency.  It was a case of either thro
w
another top section up there and trim it to length, or chunk up the stinger.

We tried the stinger first.

It worked.

One of the things that seems to change things markedly is the fact that
all my stuff is solid grounded tower stuff.  There are no insulated towers
at all in any of these systems.    Feeding them all by gamma match seems
to have a MUCH smoother setup process than insulated tower elements.

I realize that feeding them this way doe NOT create a perfect equivalent of
a simple element pole.  The current profile in the complex element may make
the comment you made above not quite as relevant.  I don't know enough hard
theory and math to debate the issue with anyone.

:)

The things don't seem to be near as critical for an inch or two here and all
that which I saw with insulated versions.   Although it would seem that
if the bandwidth was very broad for the element, the Q must be horribly low
and thus the efficiency ought to be lower also.

In practice, I can't tell the difference between the insulated versions and th
e
shunt fed versions.  The shunt fed versions have so many advantages as to
lightning protection, bandwidth and ease of tuneup, that I totally gave up
on insulated systems years ago.  The performance seems to be equal with
respect to signal strength, so I don't argue with the poles.

At these frequencies and with the available land around me, there isn't
going to be much measurement to the 1/4 of a DB and playing with the
things either!

The QTH is way out in the middle of no where in the country, so the noise
problem is greatly reduced from urban sites.  For that reason I can't really
pass a firm comment on it, but it seems that the shunt fed versions are
far quieter for trash noise than the others as well.

Mike as a guest at leviathan.tamu.edu




From [e-mail] Tue Jan 30 16:13:57 1996
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From: [e-mail] (Ty Stober)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.broadcasting,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: Larsen Antennas Job Posting
Followup-To: poster
Date: 26 Jan 1996 07:35:11 GMT
Organization: Pacifier Internet Server [phone]
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Approved: [e-mail]
Distribution: world
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MARKET MANAGER - ANTENNA PRODUCTS

Larsen Electronics is an internationally recognized supplier of quality
antenna products for two-way communications.  We are seeking an
experienced Market/Product Manager for Amateur and Commercial antennas.

Successful candidates will have in-depth experience in radio related
products up to 800 MHz. Direct experience with LMR and Amateur markets is
preferred.  Bachelor92s degree in Business or Marketing, or extensive
related business experience required. Position responsibilities include:
Product line management, pricing, sales programs, new products, training,
and technical support. This position will also include a competitive
compensation, incentive, and benefits plan.

Interested candidates may respond by forwarding a resume92 including
income history to:


Larsen Electronics, Inc.
ATT:  Human Resources Manager
P.O. Box 1799
Vancouver, WA. 98668-1799
FAX:  [phone]

Pre-employment drug screen required.  Larsen Electronics is an Equal
Opportunity Employer.

--
-------------------------------------------------------------------------
-
----
Pacifier Online Data Service Dialup SLIP/PPP User
To register: [phone] or telnet pods.pacifier.com
-------------------------------------------------------------------------
-
----



From [e-mail] Tue Jan 30 16:13:58 1996
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From: [e-mail] (nstn2527)
Newsgroups: rec.radio.amateur.antenna
Subject: Battle Creek Special
Date: 26 Jan 1996 12:33:15 GMT
Organization: NSTN Navigator User
Lines: 5
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I've heard several references to a wire antenna called the "Battle Creek
Special".  Has anyone any info on this antenna, how its constucted etc.?

Les VE1WWH



From [e-mail] Tue Jan 30 16:13:59 1996
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From: [e-mail] (David Lipson)
Newsgroups: rec.radio.amateur.antenna
Subject: Bazooka Antenna Design
Date: 26 Jan 1996 18:26:56 GMT
Organization: Medtronic Corporation
Lines: 6
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X-Newsreader: WinVN 0.90.5

Does anyone have a design for a Bazooka antenna?
I'm told their good on 160 M.

Thanks for the assistance.

de N9PVF


From [e-mail] Tue Jan 30 16:14:00 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Why is man-made RFI vertically polarized?
Date: 26 Jan 1996 18:48:22 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
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In article <4e8qfj$[e-mail]>, [e-mail]
(Stephen G. Roseman) writes:

>
>       In the ARRL General Class study guide (and I've seen it other
places)
>is a statement the "man-made interference is usually vertically
polarized".
>
>       In 25 words or less, anyone know why?
>
>Thanks,
>Steve, N3WHW

One reason man-made RF is said to be predominately vertically polarized is
because horizontally polarized components are attenuated much more
rapidly, and so mostly the vertical components remain.

Even though the polarization of sources are random, propagation effects
filter out the horizontal components.

The second reason is verticals generally accept radiation from all
different directions, and have maximum response along the ground.
Horizontal antennas have a null along the horizon and off the ends. So a
vertical is an ideal collector of random local noise sources.

73 Tom


From [e-mail] Tue Jan 30 16:14:01 1996
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From: [e-mail] (Howard Lester)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Battle Creek Special
Date: 26 Jan 1996 18:59:51 GMT
Organization: University of Arizona, Tucson, AZ
Lines: 12
Message-ID: <4eb8b7$[e-mail]>
References: <4eahmb$[e-mail]>
NNTP-Posting-Host: nemo.as.arizona.edu

In article <4eahmb$[e-mail]> [e-mail] writes:
>I've heard several references to a wire antenna called the "Battle Creek
>Special".  Has anyone any info on this antenna, how its constucted etc.?
>
>Les VE1WWH
>

Wasn't that something like installing a loading coil inside a box of
Rice Krispies?

;-)



From [e-mail] Tue Jan 30 16:14:02 1996
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From: [e-mail] (John Mitchell)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Rhombics at Low Heights?
Date: 26 Jan 1996 20:11:33 GMT
Organization: Virginia Tech/Blacksburg Electronic Village
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Message-ID: <4ebchl$[e-mail]>
References: <4dkpnb$[e-mail]>
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In article <4dkpnb$[e-mail]>, [e-mail] says...
>So, to summarize my REAL question! At an elevation of 50 or 60 feet, how
 well might a one to two
>wavelength per leg rhombic or vee-beam be expected to perform on 80
oand/or 160 meters? Would
>ground losses and reflections negate the benefits of using this type of
antenna at a low height in
>terms of wavelength? Anyone tried same?


Hi Bill,
I tried a Rhombic run thru the forest at 25-35 feet, 500 feet on each
leg, and was very disappointed.  IMHO, you sacrifice any gain developed
to ground loss, unless you can get the antenna up out of ground effect
(at least 50 feet).  I would expect that you would do better with
dipoles, inverted vees, wire beams, etc, below 50 feet, but don't expect
to develop much gain in any particular direction at that height.

I get good results with dipole /inv vees at 50 feet with a reflector
directly UNDER them.  Although this would appear to direct energy
straight up, what I find is that they actually improve radiation overall
by reducing ground losses.  I space the reflector at about .10 wavelength
and have worked a lot of dx with this setup.  Works particularly well if
your QTH has lossy ground, such as my mountainous terrain.

73, John



From [e-mail] Tue Jan 30 16:14:02 1996
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From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Solid dielectric coax
Date: 26 Jan 1996 22:07:36 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 8
Distribution: world
Message-ID: <4ebjb8$[e-mail]>
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Awhile ago someone posted a brand and type of coax that was equivalent to 9913
 specs
but was solid instead of hollow.  I've forgotten what it was.  Could some kind
 soul
please repost.  I'm looking for something short of hardline that is low loss,
relatively low cost, and will stand the Phoenix 120 degree summers.  thanks,

73, Cecil, KG7BK, OOTC  (not speaking for my employer) actually, I am this tim
e.




From [e-mail] Tue Jan 30 16:14:03 1996
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From: [e-mail] (Steven Whitehead)
Newsgroups: rec.radio.amateur.antenna
Subject: Want:  Source, flexible dual band ht ant
Date: Fri, 26 Jan 1996 23:58:43
Organization: Burgoyne Computers Inc.
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I use my HT constantly.  Have had many problems with dual band antennas
wearing out and breaking.  Last ant was an ANLI and it broke off the center
connector in the bnc.  It took 4 hours to replace the connector because I
could not get the old pin out.

Does someone make a dual band ht antenna that is flexible all the way down to
the connector i. e. does not have the solid plastic matching piece at the
bottom.  I tried Icom's ant that came on the 24 but the performance was worse
than a 440 1/4 wave.  Currently I ususally carry a scanner with me so I keep
the 440 1/4 wave on the HT and switch it with the 2 mtr helical duckie when I
need 2 meters.

Thanks,

Steve
[e-mail]


From [e-mail] Tue Jan 30 16:14:04 1996
Path: news.epix.net!news.sprintlink.net!news.mcn.net!blpm01-172
From: [e-mail] (Vince Fiscus,  KB7ADL)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
Date: Sat, 27 Jan 96 00:53:41 GMT
Organization: Montana Communications Network
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X-Newsreader: News Xpress Version 1.0 Beta #4


Best Coax for CB is one that ends in a dummy load.




From [e-mail] Tue Jan 30 16:14:05 1996
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From: [e-mail] (W2FOE)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 27 Jan 1996 02:12:28 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
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References: <4e76fb$[e-mail]>
X-Newsreader: AOL Offline Reader

Mike, there are two stations here on the east coast that may be able to
offer you some help.  Bruce, K01F, has a 4square on 80 meters with
halfwave elements.  At least he started with half waved, however, after a
while he concluded that his elevation level was (would you believe) too
low.  I don't think he is using the array on 160, but I'm sure he has done
some playing around with it.

Fred, W1FC, has a similar set up which he designed specifically for 160
(1/4 wave elements on 160, with 1/8 wave spacing); and he does use the
array extensively on 80 meters as well.  I have no idea how he solved the
matching problems.

I'm sure either would be happy to talk about it.  You can find either of
them in the 3790 to 3800 window on a regular basis.  I'm not on 160 at the
moment so I don't know where or when Fred operates there.

Regards, Merv


From [e-mail] Tue Jan 30 16:14:06 1996
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From: [e-mail] (James M. Atkinson, Communications Engineer)
Newsgroups: rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc
Subject: TSCM Counter Surveillance & Technical Security Page
Date: Sat, 27 Jan 1996 02:30:25 -0500
Organization: tscm.com
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Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: jmatk.tiac.net
Keywords: Counterintelligence Debugging Surveillance Counter-Terrorism
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Just got posted a new article on the REI OSCOR-5000, an excellent piece of
test equipment for the TSCM industry.

Also, check out our updated tool list.

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 ===============================================================
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From [e-mail] Tue Jan 30 16:14:07 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!usc!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 27 Jan 1996 09:14:29 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <4edc05$[e-mail]>
References: <4ecj8s$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com

In article <4ecj8s$[e-mail]>, [e-mail] (W2FOE)
writes:

>
>Mike, there are two stations here on the east coast that may be able to
>offer you some help.  Bruce, K01F, has a 4square on 80 meters with
>halfwave elements.  At least he started with half waved, however, after a
>while he concluded that his elevation level was (would you believe) too
>low.  I don't think he is using the array on 160, but I'm sure he has
done
>some playing around with it.
>
>
I've had that problem on both 160 and 80 also. 1/2 wl verticals stink. I
used my 160 tower on 80 by putting a parallel decoupling stub from the
base up. I made the stub 1/4 wl on 80. Then the antenna acted like a 1/4 w
on both bands.

Much like a hygain hitower does.

73 Tom


From [e-mail] Tue Jan 30 16:14:09 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Ground Radials...?
Date: 27 Jan 1996 09:19:03 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 48
Sender: [e-mail]
Message-ID: <4edc8n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Tom,
In article
<[e-mail]>,
"Thomas W. Castle" <[e-mail]> writes:
>I have read that the more radials you use the better.

Untrue. The BC studies by Lewis Brown and Epstein showed the following
points where most of the efficiency possible for a given radial length was
reached for a 1/4 wl vertical:
.137 wl long = 15 radials = 57% eff
.274 wl long = 60 radials = 80.5% eff
.412 wl long = 113 radials = 95% eff

The longer the radials, the more you can use. But no point in going beyond
those numbers!

>been told to put multiple radials in the same trench.

It will do **NO good**  to put three different length wires (or even three
same length wires) together in one trench. That's bad advice.

> I was also told to put grounding rods
>at the end of each wire and bond them together.

Ground the far end? That will help if the radials are very short on the
band you are using, but certainly not where they are more than .1 wl long.


>To me this seems like over kill...? Not to mention a lot of digging.
>I can see the idea of using part of a wave length to figure in the
>ground wire length. The Question is : Do you need to figure them for
>20, 40 & 80 like that for each band? If so how about 15 & 10 mtrs as
>well? Not to mention the WARC bands..?

When a radial is on or in the ground, or even very close to the ground, it
is not very "resonant". If you don't believe this, lower your dipole down
and lay it on the ground and measure the SWR and bandwidth. Radial
resonance is *ONLY* important if the radials are elevated and there are
very few radials in the elevated system. Expect the efficiency to be 50%
or less if a small elevated resonant system is used.

>from F.P.L. check the ground conductivity with a "Meggar". A 20'
>ground rod gave a .5 ohm ground <1" solid brass rod x 20'>...

That is almost meaningless for the RF performance.

73,
Tom


From [e-mail] Tue Jan 30 16:14:11 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!holmes.sgate.com!jekyll.sgate.com!donovanf
From: Frank Donovan <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED : GREAT 80 METER DX ANTENNA
Date: Sat, 27 Jan 1996 11:58:08 -0500
Organization: Southgate Internet Host
Lines: 50
Message-ID: <[e-mail]>
References: <4e76fb$[e-mail]> <4e8l64$[e-mail]> <4e9t5r$[e-mail]>
NNTP-Posting-Host: jekyll.sgate.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4e9t5r$[e-mail]>

This is a clarification of the method that I successfully use to detune a
tower located near (within a wavelength) a vertical antenna.

When a tower is in the near field of a vertical antenna, inevitably a
parasitic current will be induced into the tower by the vertical
antenna.  The tower and antenna form a parasitic array, and the intended
radiation from the vertical antenna will be distorted, often severely.

The approach I use to detune the tower -- by attaching a carefully selected
horizontal wire to the tower --  is only one of many available
detuning methods.  It offers the advantage of wide bandwidth, and
therefore non-critical adjustment.  I will discuss only the horizontal
detuning wire method.

This approach cancels the net radiation from the tower by utilizing a
horizontal "detuning wire" to force a current minimum at approximately
the mid point of the tower height.  The parasitic tower currents above and
below this mid-point then produce minimal net radiation.

First, determine where on the tower a horizontal wire can be attached.
If you have horizontally polarized Yagis on the tower, you will want to
place the wire well away from the Yagi, at least 1/4 wavelength above
and/or below.

The length of the detuning wire must be 1/2 wavelength at the operating
frequency of the vertical MINUS the distance from the mid-point of the
tower to the attachment point of the wire.

For example:  To minimize parasitic radiation from a 100 foot tower
affecting a nearby 160 meter vertical, and the 100 foot tower has a
triband beam at the top, you elect to attach a horizontal detuning wire
80 feet up the tower.  To determine the required length of the
detuning wire, first subtract half the height of the tower (50 feet) from
the height of the detuning wire attachment point (80 feet) for a result
of 30 feet.  The required detuning wire length is 1/2 wavelength (270
feet on 160 meters) minus 30 feet for a required detuning wire length of 240
feet.

Now, having said all of this, by far the best way to select the detuning
wire length (other than detailed pattern measurement!) is to use an antenna
modelling program, such as EZNEC.  Model the tower and its attached
antennas and metallic guys (if not broken up with insulators), and the
nearby vertical antenna.  The model will show the pattern distortion
affecting the vertical antenna.  You can now add the horizontal detuning
wire to the model and select the optimum length by minimizing the net
pattern distortion.

73!
Frank
W3LPL


From [e-mail] Tue Jan 30 16:14:12 1996
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!goanna.cs.rmit.EDU.AU!news.apana.org.au!panther.apana.org.au!news
From: CandyMAN <[e-mail]>
Newsgroups: rec.photo.equipment.medium-format,rec.photo.equipment.misc,rec.photo.film+labs,rec.photo.marketplace,rec.photo.misc,rec.photo.technique.art,rec.photo.technique.misc,rec.photo.technique.nature,rec.photo,technique.people,rec.ponds,rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb
Subject: Re: ***KEYBOARD RECORDERS***********************************************
Date: 27 Jan 1996 12:42:27 GMT
Organization: AARDVARK Internet - Melbourne Australia
Lines: 4
Message-ID: <4ed6jj$[e-mail]>
References: <4dmb8v$[e-mail]>
NNTP-Posting-Host: dialup-15.aardvark.apana.org.au
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Xref: news.epix.net rec.photo.equipment.medium-format:1266 rec.photo.equipment.misc:1067 rec.photo.film+labs:617 rec.photo.marketplace:27166 rec.photo.misc:36722 rec.photo.technique.art:442 rec.photo.technique.misc:525 rec.photo.technique.nature:590 rec.ponds:6513 rec.puzzles:54128 rec.puzzles.crosswords:4946 rec.pyrotechnics:40002 rec.radio.amateur.antenna:18681 rec.radio.amateur.equipment:24151 rec.radio.amateur.misc:97312 rec.radio.amateur.policy:32765 rec.radio.amateur.space:6201 rec.radio.cb:25904

Do we REALLY need to see this type of thing in rec.pyrotechnics?!?!?





From [e-mail] Tue Jan 30 16:14:13 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: All spammers please read was (Re: WI Hams Please read!
Message-ID: <[e-mail]>
Summary: Use your Distribution attribute properly.
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ecli3$[e-mail]>
Date: Sat, 27 Jan 1996 13:35:55 GMT
Lines: 43
Xref: news.epix.net rec.radio.amateur.antenna:18683 rec.radio.amateur.misc:97319 rec.radio.amateur.policy:32769

In article <4ecli3$[e-mail]> [e-mail] (Gary Schwartz
) writes:
>If you don't live in Wisconsin, please excuse the bandwidth.

There would be no need to ask our pardon if you'd properly set the
Distribution header line in your message. The reason the Distribution
attribute exists is so that messages of only local interest can be
limited in distribution to only the local area. If you leave it blank,
as I have in this posting, the default distribution is *world*. But there's
no reason to leave it blank if your message is intended for a smaller
audience.

Each area has its local distribution codes, state codes, regional codes,
country codes, and the default of world. If you don't know the proper
distribution coding to use, ask your sysop. There's no use wasting
the entire world's time with, for example, an announcement of your
local BBS number in Los Angeles when a distribution of LA would limit
it to only those who might care. Same with notices of exam sites for
a locale, IE exam notices for Southern California should have a distribution
attribute of SoCAL. And the same goes for the president of my local club who
recently spammed the world about an event that should have been limited
to an ATL distribution (or at most to a GA distribution). There's no good
reason to spam the net when the tool to prevent that is available to you
in *every message header*. It's just good nettiquette.

In the proximate case, there was enough of non-local interest in
your post to justify the "world" distribution (or at least a
USA distribution), but because that's true, you needn't beg
forgiveness for using the bandwidth.

Sorry to seem to be singling you out for this lecture, but yours
is just the most recent of a number of posts of this nature. Please
everyone, use the Distribution attribute properly for locale specific
postings. If you don't know how, ask your provider. If he tells you
his system won't permit it, demand he fix his system. Every usenet
message has a Distribution attribute in the header, and every system
has to have a way to set it to some value.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Jan 30 16:14:14 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Rick Markey)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Ham-Ant Digest V96 #29
Date: 27 Jan 96 14:21:06 GMT
Organization: ucsd usenet gateway
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


>Date: 23 Jan 1996 16:13:05 GMT
>From: [e-mail] (nstn2527)
>Subject: Thru Tinted Glass Ants.
>
>I've heard that thru-glass mobile antennas do not work so well on tinted
>automobile windows.  Anyone have any info on this?
>
>Les VE1WWH

A regular tinted window is OK.  I understand, however, that some forms of
tinted windows use some metal in them which would be a problem.
Unfortunately, I don't know how to tell the difference.  de Rick Markey, KN3C





From [e-mail] Tue Jan 30 16:14:15 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DCimp)
Newsgroups: rec.radio.amateur.antenna
Subject: Syntor Manual
Date: 27 Jan 1996 14:43:07 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <4edv8b$[e-mail]>
Reply-To: [e-mail] (DCimp)
NNTP-Posting-Host: newsbf02.mail.aol.com

I need a Syntor Manual for VHF, prefer the 136-150 Split, but any VHF will
do, Not the Syntor X, or the Syntor X9000, just plain Syntor
thanks   [e-mail]


From [e-mail] Tue Jan 30 16:14:17 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!newsrelay.netins.net!news.netins.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GAP Titan DX Vertical Antenna
Date: 27 Jan 1996 18:27:36 GMT
Organization: INS Information Services, Des Moines, IA USA
Lines: 67
Message-ID: <[e-mail]>
References: <4e0vvv$[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ins.netins.net

In article <[e-mail]>, Jeff Blumenfeld KB3DX <[e-mail]>
writes:
>Subj:   Re: GAP Titan DX Vertical Antenna
>Date:   Wed, Jan 24, 1996 4:32 AM EDT
>From:  [e-mail]
>X-From:        [e-mail] (Peter C. Markham)
>To:    [e-mail]
>
>>I just bought one of those myself, but haven't put it up yet, due to
>>the weather.  The GAP folks (as I guess you know) say you can mount
>>it either about 8' off the ground on a metal pipe, or at rooftop,
>>with no difference in performance.  I'd be interested in hearing
>>your experience with its performance.
>
>  I made the mistake of purchasing the Titan, after seeing it at the Dayton,
>94 hamfest. I mounted it on a the roof of a single story wood frame building
>with the counterpoise? 36" above the peak of the roof, 22 ft. above ground.
>
>  I used my FT-890, the Titan switched direct, and the 80m dipole, straight,
>at 33ft with balanced feed switched through an MFJ-949B tuner, for the
>following observations. Only on 40m did it perform better than my 80m dipole
>at 33ft, at low angles, < 10 degrees, in most directions.  40m at >10 degrees

>it was consistently down in all directions except a small sector off the ends

>of the dipole, where it was 1 to 2 S units better. On 30m it was down by 2 S
>units,  compared to the dipole in the directions of least difference between
>the two antennas. On 7, 14, 18, 21, 24 and 28 mhz it was down > 1/2 S unit at

>all az and el angles with very few exceptions. On 80m the performance was dow
n
>1 to 2 S units, in general, but given the antenna's space requirements and
>physical length, I consider its performance acceptable.
>
>  I used an MFJ-202 noise bridge to get an idea of ant Q, resonance and band
>width. On 30m the resonance was 400khz high. On the other bands, it was
>sufficiently close that operating environment/assembly, may have been
>responsible for the errors noted. The Q was quite high and narrow on the high

>end of 80m, exactly where it should have been for the capacitor used and
>required on that band. As a general observation the other bands had an antenn
a
>Q quite low and broad, which troubled me, bringing to mind the characteristic
s
>of a dummy load.
>
>  (Lots of stuff edited here to save space)
>
>   I submit that the same characteristics exhibited by the antenna at 2
>different locations is probably a consequence of design, barring some
>subtle assembly mistake I made, assembling the antenna twice, with meticulous
>care, by the book. I accept that my empirical methods may not hold up under
>the scrutiny of perfectionists. I have no doubt of the general differences in

>operating characteristics of the 2 antennas compared. I have no doubt about
>the general antenna characteristics observed with the noise bridge and
>spectrum analyzer. I have made my way through life as a generally competent
>electronic technician who thinks about what he does, and despises wild a--
>guesses.
>
>   For the better part of the last 9 months, I have been using it with a Come
t
>duplexer as an BCB/SW antenna for listening only, and as a 2 meter antenna fo
r
>local work. SWR on 146 is 1.6:1
>
>   Yes, I have buyer's remorse.  :-)
>
>                                      Pete, wa4hei
Pete:
Thanks for one of the rational and cogent posts that I have run across on this

newsgroup since I subscribed! The "GAP controversy" has certainly sparked a lo
t of
comment. Yours is a very acceptable, (IMHO) analysis of the relative merits of
this product. You used tools and made observations that the "average ham", mea
ning
me, can understand and reproduce.
Now, can you get your hands on some of the other "radial-less" verticals to ma
ke
some comparison? ;_)
73 de WB0FDJ. QTH northern Iowa. 40 & 20 c.w./QRP


From [e-mail] Tue Jan 30 16:14:18 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!brutus.bright.net!chi-news.cic.net!uwm.edu!homer.alpha.net!daily-planet.execpc.com!earth!n9yjz
From: [e-mail] (Joseph Moschella)
Newsgroups: rec.radio.amateur.antenna
Subject: WI Hams Please read!
Date: 28 Jan 1996 02:52:00 GMT
Organization: Exec-PC
Lines: 9
Message-ID: <4eeocg$[e-mail]>
NNTP-Posting-Host: earth.execpc.com
X-Newsreader: TIN [version 1.2 PL2]

        Just as a footnote to Gary's letter, It's also possible to reach
the members of the Legislature by e-mail. I'm not sure how often they check
it, but the two lists for the Senators and the Representatives addresses can
be found at "http://badger.state.wi.us/agencies/wilis/leginfo/inetmail.html"

73's
Joe Moschella, N9YJZ
Brookfield, WI 53005



From [e-mail] Tue Jan 30 16:14:19 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.orst.edu!engr.orst.edu!rutgers!venus.sun.com!cs.utexas.edu!howland.reston.ans.net!lamarck.sura.net!fconvx.ncifcrf.gov!mack
From: [e-mail] (Joe Mack)
Subject: Re: Testing co-axial filter
Message-ID: <[e-mail]>
Organization: Frederick Cancer Research and Development Center
References: <[e-mail]>
Date: Sun, 28 Jan 1996 03:14:34 GMT
Lines: 49

In article <[e-mail]> [e-mail] (Alfred Lee) writes:
>
>Greetings.
>
>Many hams living in the metropolitans are having inter-mod problem with
>outside antenna in the VHF and UHF bands.  I am wondering if anyone
>has tried using filter made from l/4 lines to filter strong out of
>band signals.

It's done all the time with coaxial cavities, to make duplexers for
repeaters for instance where you need to reject a signal 600kc away
on 2m. These are overkill for your needs. A single cavity using
the design which (I think) is in the ARRL manual is plenty. People
dont make filters out of coax cable and I don;t know why. I expect
the Q is not very high, but to differentiate between 144 and 154MHz
I don';t think you'd need that much Q.


>
>What I have in mind is to insert two open l/4 (electrical length)
>transmission line stubs in series to the centre conductor and the shield.
>Then parallel two shorted l/4 stubs from the centre conductor to the
>shield at both end of the first two stubs.

>
>I wonder what kind of insertion loss would result and what kind of
>attenuation can be achieved, say 154 MHz for 2 meter band.  Also how
>may we test for insertion loss and attenuation using average hams'
>equipment.

I spent a lot of time trying to do this sort of thing and wound up
very disheartened. You 've got to do it the same way the professionals
do it - with a network analyser.

        I'm afraid it's very hard to be a pure "amateur" and got a whole
lot done. Somethings need more than and SWR meter and a multimeter.

        Joe NA3T
        [e-mail]


>
>73,
>
>---
>Alfred Lee                                                       alf@kaiwan.c
om
>KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'




From [e-mail] Tue Jan 30 16:14:20 1996
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: Jack Ray <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: High Quality Dipole Antennas
Date: 28 Jan 1996 05:33:32 GMT
Organization: MindSpring Enterprises, Inc.
Lines: 11
Message-ID: <4ef1rc$[e-mail]>
NNTP-Posting-Host: k4mzw.mindspring.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2 (Windows; U; 16bit)


I am Distributor for the Fritzel antenna line from Germany.

Fritzel builds very high quality Beams and Dipoles, like nothing else on the m
arket.

These are available from your favorite dealer or direct:

                                 Electronic Switch Company, Inc.
                                 8491 Hospital Drive, Suite 328
                                 Douglasville,  GA  30134   USA



From [e-mail] Tue Jan 30 16:14:21 1996
Path: news.epix.net!news.sprintlink.net!siemens!news.ecn.bgu.edu!feenix.metronet.com!news
From: ken brookner <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: MFJ SWR Analyzers - Any users?
Date: Sun, 28 Jan 1996 09:01:36 -0600
Organization: Texas Metronet, Inc  (login info (214/705-2901 - 817/571-0400))
Lines: 23
Message-ID: <[e-mail]>
References: <4dbe97$[e-mail]> <4dkpgd$[e-mail]> <1197cc$[e-mail]>
NNTP-Posting-Host: fw36.metronet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b6a (X11; I; Linux 1.2.13 i486)

Dave Mann wrote:
>
> RE: MFJ-259 SWR Analyzer ... Our friend K8MFO brought one with him to
> VP2E a couple of months ago and is was GREAT!  I used it to sort
> through all kinds of pieces of damaged and undamaged coax, several
> yagi antennas, 3 verticals, discovered my R7 was mistuned, tested and
> retuned a 160 meter dipole, and did about 3 or 4 2 meter anteannas.
> All in about 4 days.  This was terrific help to us, after Hurricane
> LUIS managed to blow everything down and around.  If I had the money,
> you can be SURE I would buy one of the MFJ Analyzers.  I had never
> used one before, and it took me about 10 seconds to figure out how to
> use it.  Also, without reading the instructions, figured out how to
> test coax with a dummy load at one end, and all kinds of other great
> stuff.  Hats Off to MFJ!
>
> best 73's
> Dave, VP2EHF
> Dorothea, VP2EE
> Little Harbour, Anguilla, British West Indies

agreed!  saves lots of time.

kenb, n5lpi


From [e-mail] Tue Jan 30 16:14:22 1996
Path: news.epix.net!news.sprintlink.net!ionews.ionet.net!usenet
From: Hank Blackstock <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Transformer for Screwdriver type antenna
Date: 28 Jan 1996 13:33:08 GMT
Organization: IONet
Lines: 13
Message-ID: <4eftuk$[e-mail]>
References: <1187cc$[e-mail]>
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To: [e-mail]

[e-mail] (Garry Foster) wrote:
>I hear that Don Johnson and others are now recomending a matchinng
>transformer at the base of this antenna instead of the matching
>capicators.

I can't imagine what the advantage would be. capacitors, are
cheap, simple and effective. I have used them for years on my
screwdriver antenna. (my own design with 3.5 inch coil).
someone please enlighten me as to the advantage.

73 Hank




From [e-mail] Tue Jan 30 16:14:23 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.mtu.edu!news.mtu.edu!not-for-mail
From: [e-mail] (mike)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.antenna
Subject: Special Events Station!!!
Date: 28 Jan 1996 17:04:14 -0500
Organization: Michigan Technological University
Lines: 50
Message-ID: <4egrsu$[e-mail]>
NNTP-Posting-Host: techsrv1.tech.mtu.edu
X-Newsreader: TIN [version 1.2 PL1]
Xref: news.epix.net rec.radio.amateur.equipment:24230 rec.radio.amateur.homebrew:12991 rec.radio.amateur.misc:97371 rec.radio.swap:56161 rec.radio.amateur.digital.misc:13813 rec.radio.amateur.policy:32810 rec.radio.amateur.space:6209 rec.radio.amateur.antenna:18699

Thank-you for reading this.  My name is Michael Long (KB8WPE) and I am
the Public Relations Manager for the Husky Amateur Radio Club (HARC) whose
callsign is W8YY.  The club is located on the Michigan Technological
University campus.

Starting on February 1, 6am EST, and continuing on until February 3, 6am
EST, W8YY will be running a Special Events station for Michigan Tech's
Winter Carnival '96.  The frequencies listed below are the most likely
place we will be operating.  For this Special Events station we have
8"x11" certificates that would look great on anyones' wall!  All you
have to do is contact us and then send a QSL with a self addressed stamped
envelope to receive the certificate.

Here are the frequencies:

Band            Frequency               Mode            Time
160m            1.90 MHz                LSB             8pm-8am
75m             3.90 MHz                LSB             10pm-8am
40m             7.25 MHz                LSB             7pm-10pm
20m             14.250 MHz              USB     majority of the day (8am-7pm)
17m             18.150 MHz              USB     if open 8am-7pm
15m             21.350 MHz              USB     if open 8am-7pm
10m             28.40  MHz              USB     if open 8am-7pm
2m              144.2 MHz               USB             All the time
                146.58 MHz              FM              All the time
70cm            432.100 MHz             USB             All the time


Again, thank-you for reading this message and all of us here hope to
here from you during the Special Events station!

For any more info. email me at [e-mail] or the Club President,
Dave Gillahan, at [e-mail]

You can also check out our homepage at
http://techsrv1.tech.mtu.edu:8080/harc.html
Though it is just beginning it does have a little information on it.

Sincerely,
Mike Long -KB8WPE-


--
 /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
 \ Michael Long               ||   Public Relations Manager /
 / Callsign:  KB8WPE          ||        for HARC (W8YY)     \
 \ Email:     [e-mail]  ||    Email:  [e-mail]  /
 / Phone:     [phone]   ||     Majors:  EET and EMT   \
 \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/



From [e-mail] Tue Jan 30 16:14:24 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!uunet!in1.uu.net!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!aztec.asu.edu!cjpratsj
From: [e-mail] (CAMILLE J. PRAT, SJ)
Newsgroups: rec.radio.amateur.antenna
Subject: covenants and antenna restrictions
Date: 28 Jan 1996 20:06:55 GMT
Organization: Arizona State University, Tempe, AZ (USA)
Lines: 18
Message-ID: <4egl0v$[e-mail]>
Reply-To: [e-mail] (CAMILLE J. PRAT, SJ)
NNTP-Posting-Host: aztec.asu.edu


A QST -- Lately, some posters have asked for info about actions
regarding antenna restrictions.  I know I've seen some specific
cases somewhere, but forgot to mark where.  (Hope others learn
from this mistake!)

For the interested, some info is available at this URL:
     http://www.accessone.com/~vbook/hronline.htm

Once you're in, click the "Ham Radio On-Line Library" and look
for "Complete Formatted PRB-1 text concerning Antenna
Ordinances".

This is general information and somewhat heavy reading, but at
least it's solid and a start....

Hope this helps ----  Camille Prat   KB7LBN   [e-mail]
--


From [e-mail] Tue Jan 30 16:14:25 1996
Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!yuma!holly.ACNS.ColoState.EDU!drranu
From: [e-mail] (Emarit Ranu)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Why is man-made RFI vertically polarized?
Date: 28 Jan 1996 21:08:05 GMT
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 30
Message-ID: <4egojl$[e-mail]>
References: <4e8qfj$[e-mail]> <4e98jh$[e-mail]>
NNTP-Posting-Host: holly.acns.colostate.edu
X-Newsreader: TIN [version 1.2 PL2]

Gary Myers ([e-mail]) wrote:

: Gauss' law requires that the electric field must always be
: perpendicular to a conductor. Since manmade rfi usually arrives by
: ground wave (as opposed to skip), the electric field is perpendicular
: to the conducting earth, i.e., vertically polarized.


        Actually Gauss' Law for electric fields states that the electric
        flux through any close surface equals the charge enclosed (remeber
        the closed integral around a surface of the scalar product of flux
        denisty and differential surface is equal to Q enclosed).
        Conversely Gauss' Law states nearly the same for magnetic quantities
        except the quanty of the intergal is zero (no such thing as a
        magnetic charge).  Where the electric flux density D is replaced
        by the magnetic flux density B.  Maxwell's equations state the same
        thing by use of the del operator.

: Ok, ok, that's more than 25 words...

: Gary K9CZB
: [e-mail]


--
        -Emarit, KG0CQ  73's   [e-mail]
        Electrical Engineering, Colorado State Univeristy
        Packet:                KG0CQ@KF0UW.#NECO.USA.NOAM
        All generalizations are bad.  Censorship:  ######
        _._  __.  _____  _._.  __._


From [e-mail] Tue Jan 30 16:14:26 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!crl11.crl.com!not-for-mail
From: [e-mail] (Michael Stone)
Newsgroups: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy
Subject: Re: TSCM Counter Surveillance & Technical Security Page
Followup-To: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy
Date: 28 Jan 1996 21:13:08 -0800
Organization: CRL Dialup Internet Access
Lines: 19
Message-ID: <4ehl14$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: crl11.crl.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.scanner:44567 rec.radio.shortwave:69400 misc.legal.computing:19838 comp.security.unix:24081 rec.radio.amateur.antenna:18708 rec.radio.amateur.equipment:24256 rec.radio.amateur.misc:97399 rec.radio.amateur.digital.misc:13821 rec.radio.amateur.homebrew:12997 rec.radio.amateur.policy:32827

James M. Atkinson, Communications Engineer ([e-mail]) wrote:

: Here is the current list of frequencies used for bugging, technical
: surveillance and similar activities.

:        Outband Equipment
:        ANY Television broadcast or Cable TV frequency
:        ANY FM radio broadcast frequency
:        ANY Paging or Beeper frequency
:        ANY Cellular Telephone frequency

:        Keep in mind that the federal government can use virtually any
:        frequency between DC and light.

: Summary (this will catch 99.99% of all Non-Intell/Diplomatic RF bugs)

Gee whiz.




From [e-mail] Tue Jan 30 16:14:27 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Richard MacDonald)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Inverted V or long wire?
Date: Sun, 28 Jan 1996 22:06:50 -0700
Organization: Netcom
Lines: 24
Message-ID: <4ehkld$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-den6-20.ix.netcom.com
X-NETCOM-Date: Sun Jan 28  9:06:53 PM PST 1996
X-Newsreader: Forte Agent .99b.112

On Sat, 27 Jan 96 11:37:50 EST, [e-mail] wrote:

>I don't have my ticket, but I am listening mostly on 80M using a 160' piece
>of wire strung from my basement window through the trees about 8' high. I am
>considering putting up an inverted V at about 50' then moving to a full dipol
e.
>Is it worth the effort for listening? The long wire runs east to west. Are th
er
>there any easy tuner circuits that can improve the long wire performance? I a
m
>listening on an HW101.
>Thanks.

I've never had any reason to go from an inverted V to a "full dipole." All of
the inverted V's that UI have had were full dipoles but were shaped to match 5
0
ohm coax. I don't believe there is any real advantage to a flat dipole over th
e
V.

A tuner will help a bit but not as much as a higher tuned antenna with some
radials. For DX listening a vertical may work well also because of better low
angle response. If you want directionality, you could even try a rhombic. Now
that would take lots of space and give much improvement in one direction...

Actually the last is somewhat kidding but I do wish I had the space for one.

Dick - AD0J



From [e-mail] Tue Jan 30 16:14:29 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Testing co-axial filter
Date: 28 Jan 1996 23:38:22 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 59
Message-ID: <4eh1de$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Joe Mack ([e-mail]) wrote:

: I spent a lot of time trying to do this sort of thing and wound up
: very disheartened. You 've got to do it the same way the professionals
: do it - with a network analyser.

:       I'm afraid it's very hard to be a pure "amateur" and got a whole
: lot done. Somethings need more than and SWR meter and a multimeter.

I'd like to offer a slightly different viewpoint.  I have network analyzers
available, and yes, they are certainly nice to measure what you have put
together and to tune up adjustments.  But---if you don't start with a
_design_ then you will have a terrible time getting the performance you
want.  The design part, for me, must include an understanding of several
things including the materials and components I'm working with and what
happens when you arrange things in different ways.  In the case of a filter
built from transmission lines, for example, I'd split the problem into
parts.  For a filter with particular characteristics, I know it can be done
with certain "poles" and "zeros", mathematical abstractions if you will,
and that I can realize practical poles and zeros with resonators, and that
a stub of coaxial cable can be a resonator.  Furthermore, I know that in
the completed design, the poles will have associated "Q" factors -- loaded
Q.  And I know that the unloaded Q of each resonator must be higher than
the loaded Q, and that the ratio of the loaded to unloaded Q will tell me
how much loss the resonator has.  And for a given coaxial cable I can
pretty easily tell you the unloaded Q when using it as a resonator.

I think one of the big problems folk get into when they try to just
connect some pieces of transmission line to make a filter is that they
end up with very poorly controlled couplings among the resonators, and
as a result end up with filters with very strange frequency responses.
That's assuming you just toss things together thinking "this will look
like a short here or an open here..."  You have very little insight into
either the loaded or unloaded Q of the resonators.

If you don't design your filter before you put it together, you are sure
likely to need a network analyzer to get even close to the desired results.
But if you design it and assemble it carefully, the analyzer will be needed
only as a check or for a small tweak in tuning.

OK, so let's take a quick peek at using transmission lines for filtering...
Consider a line like foam-RG-8 type with a velocity factor of .8 and
an attenuation of 2dB/100 feet.  At 2 meters, if I did my math right,
the unloaded Q of a resonator made from this line would be about 260.  Now
why would I want to use a 16" piece of this line to make a resonator with
that Q, when I could just as well wind a coil half an inch in diameter and
half an inch long and get just as high a Q?  Or, by making a helical
resonator in a short piece of 1" copper pipe, I can end up with an unloaded
Q of about 500, and get half the loss as if I used the transmission line.
And if I want bandwidths on the order of 1.5MHz at 150MHz, I'll need loaded
Q's of 100 for the simplest filters and quite a bit higher for higher order
filters.  So the very first step in a _design_ tells me that coaxial cable
is probably NOT the way to implement the resonators I'll need.


--
Cheers,
Tom
[e-mail]


From [e-mail] Tue Jan 30 16:14:31 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Gap Antennas
Date: Mon, 29 Jan 96 01:15:47 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 12
Message-ID: <[e-mail]>
References: <4dfj24$[e-mail]> <Pine.BSD/[e-mail]>
NNTP-Posting-Host: bos1g.delphi.com
X-To: Kory Hamzeh <[e-mail]>

Hi Scott,

I've used the GAP Voyager for a few years (since it first came out).
I don't care what the others say.  It's a fantastic antenna for 80 and 40.
Easily worked the world with it and always received outstanding signal
reports.  Granted, it's not great on 160 but it is usable there and it
was OK for my operation.  I'm very happy with it.  Only "criticism" is
that the factory's guying recommendations are too optimistic - it's not
real stable unless you guy it significantly better than the directions
tell you.  However, the antenna *is* a great performer.

73, Mike KB3RG/CU3LF/CU0WPX


From [e-mail] Tue Jan 30 16:14:31 1996
Path: news.epix.net!news.sprintlink.net!news.qnetix.ca!usenet
From: [e-mail] (AcadΘmie du Savoir)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help calculating transmission power
Date: Mon, 29 Jan 1996 02:36:21 GMT
Organization: Qnetix Networking Group
Lines: 23
Message-ID: <4ehf8e$[e-mail]>
NNTP-Posting-Host: 204.19.37.63
X-Newsreader: Forte Free Agent 1.0.82


|----(-------------------------------------------------------------10 km------
--------------------------------------------->)----|
|                                                                                                        |
|                               frequency=10 Ghz                                |
|                                                                               |
|                                                                               |
|                                                                               |
___                                                                             ___
Transmitting                                                                    Receiving

Gain= 10db                                                                      Gain=40 db

What is the transmitting power if the signal is recieved at -80 dBm?

Please give me an answer in dBm and in Watts

Thanks is advance, an answer would be very welcomed

P.S. If you could answer before monday 29 4 p.m. it would be great

Brad Wilson
Canada



From [e-mail] Tue Jan 30 16:14:32 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!chi-news.cic.net!newsfeed.internetmci.com!uwm.edu!newsspool.doit.wisc.edu!news.wisc.edu!lumkes
From: [e-mail] (John Lumkes)
Newsgroups: rec.radio.amateur.antenna
Subject: Yagi design and tuning ?'s
Date: 29 Jan 1996 03:16:34 GMT
Organization: College of Engineering, Univ. of Wisconsin--Madison
Lines: 17
Message-ID: <4ehe6i$[e-mail]>
NNTP-Posting-Host: hp-27.cae.wisc.edu

 I just built a Yagi using the design software packaged with the
latest antenna handbook. Question is this: I design it for a center
frequency of 146 but when I tune it I get a perfect match at 144 MHz.
I built a T-match with a 4:1 coaxial balun. (6-ele). I started
shortening the driven element but the perfect match seemed to
still occur around 144. Before I shorten the DE more, what is the
correlation between the surrounding element lengths as far as
tuning freq. is concerned? Should I just keep shortening the DE
and a assume the design software is correct for the other element
lengths or will shortening the DE not produce the desired effect.
Do I need to shorten all the elements to produce a good match at a
slightly higher frequency? (Non-conducting boom, 3/8" dia alum. ele)

Welcome any hints and insights,

Thanks alot, John Lumkes AA9QP  [e-mail]



From [e-mail] Tue Jan 30 16:14:34 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!munnari.OZ.AU!news.uwa.edu.au!newsman.murdoch.edu.au!usenet
From: [e-mail] (Walter Howse)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GPS antenna designs needed
Date: 29 Jan 1996 03:41:26 GMT
Lines: 24
Message-ID: <4ehfl6$[e-mail]>
References: <[e-mail]> <[e-mail]> <4e253u$[e-mail]>
NNTP-Posting-Host: cleo.murdoch.edu.au
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2

In article <4e253u$[e-mail]>, [e-mail] says...
>
>I've been looking for a couple of years for a GPS auxillary antenna
>project, and the best I've seen was a patch antenna in last October's
QST.
>It was a very good article, but I haven't had a change to build it...

I have built two of them for my Magellan Trailblazer and am delighted
with the results.

73

Wal
--
=========================================================================
=
Dr Walter J Howse                        | [e-mail]
4 Renton St                              | Phone + 61 9 317 2967
Melville                                 | Fax   + 61 9 317 3113
WA Australia  6156                       |
Amateur Radio Station VK6KZ  located OF77vw  Local time UTC + 8
=========================================================================
=



From [e-mail] Tue Jan 30 16:14:34 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Bill W. Cox [AA4NU])
Newsgroups: rec.radio.amateur.antenna
Subject: Feedback on Sommer XP-series Yagis ???
Date: 29 Jan 96 05:44:13 GMT
Organization: ucsd usenet gateway
Lines: 21
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Interested in some "real-world" feedback regarding Sommer (DJ2UT) antennas.

Is this a popular antenna in the EU market ?  Best features are ?

How well do they perform as compared to the Cushcraft/Hygain/KLM/Mosley
styled "xxxxx-banders" ?  Best bands ? Worst bands ?

Any interaction problems with other nearby antennas ?

Reliable mechanically and electrically ? Problem areas ?

Product reviews been written ?

Customer support ?

Anyone run this thru EZNEC or similar ?

Please respond here so all interested may learn, or via my 'address'
if you wish for your comments to remain private ....

73 es TU !  de Bill AA4NU  ([e-mail])


From [e-mail] Tue Jan 30 16:14:35 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsxfer2.itd.umich.edu!chi-news.cic.net!usc!math.ohio-state.edu!cs.utexas.edu!news.ti.com!usenet
From: Joe Fitter   BV/N0IAT <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: need info:  5/8 wave 2m/70cm antenna
Date: 29 Jan 1996 10:32:24 GMT
Organization: Texas Instruments Asia, Taipei TAIWAN R.O.C.
Lines: 14
Message-ID: <4ei7no$[e-mail]>
References: <4e3l0k$[e-mail]> <4e7gnr$[e-mail]>
NNTP-Posting-Host: 137.167.36.115
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

COMET AND DIAMOND BOTH MAKE 1/2 WAVE ANTENNAS FOR VHF AND UHF (DUAL
BAND CONFIGURATION IN SOME CASES).  Oops...sorry for the caps.  The
1/2 wave design requires no ground plane, since the body of your
'vette is likely fiberglass.  They make a low profile type
antenna that can handle about 75 watts of FM rf, uses a standard
PO mount etc.

I have seen this antenna mounted on a small bracket that protrudes
out from underneath the bumper of the car.  The antenna bracket is
made from stock 1/8 inch aluminum and is bolted to underside of the
car.    No need for adequate grounding, since it's a 1/2 wave antenna.

Joe



From [e-mail] Tue Jan 30 16:14:36 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!tank.news.pipex.net!pipex!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Gap Antennas
Date: 29 Jan 1996 11:18:30 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 9
Message-ID: <4eiae6$[e-mail]>
References: <4dfj24$[e-mail]> <Pine.BSD/[e-mail]> <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>However, the antenna *is* a great performer.

Mike, your success is more the result of your operating procedures than
of the antenna performance. Comparisions have shown that it is beat by
1 - 2 S-points by a simple dipole at the same height.

73, Moritz DL5UH




From [e-mail] Tue Jan 30 16:14:37 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.mindspring.com!sco.mindspring.com!sco
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: HELP: Longwire Ant for FT-840
Date: Mon, 29 Jan 1996 12:17:42 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 6
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sco.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]



>I want to run a long wire antenna for my Yaesu FT-840 to cover the SWL and HA
M
>bands. Do I need a tuner with the wire? Can I make the wire any length that i
s
>practical.



From [e-mail] Tue Jan 30 16:14:38 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!gatech!newsfeed.internetmci.com!mr.net!news.mr.net!dawn.mmm.com!news
From: [e-mail] (Gary Hosler - KN0Z)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Date: Mon, 29 Jan 1996 13:25:52 +0000
Organization: 3M - St. Paul, MN  55144-1000 US
Lines: 25
Message-ID: <[e-mail]>
References: <4ecli3$[e-mail]> <[e-mail]>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b5 (WinNT; I)
Xref: news.epix.net rec.radio.amateur.antenna:18720 rec.radio.amateur.misc:97435 rec.radio.amateur.policy:32841

Gary Coffman wrote:
>
> In article <4ecli3$[e-mail]> [e-mail] (Gary Schwar
tz) writes:
> >If you don't live in Wisconsin, please excuse the bandwidth.
>
> There would be no need to ask our pardon if you'd properly set the
> Distribution header line in your message. The reason the Distribution
> attribute exists is so that messages of only local interest can be
> limited in distribution to only the local area. If you leave it blank,
> as I have in this posting, the default distribution is *world*. But there's
> no reason to leave it blank if your message is intended for a smaller
> audience.
> -------SNIP------
>
> Sorry to seem to be singling you out for this lecture, but yours
> is just the most recent of a number of posts of this nature.-------SNIP-----
-

I think you missed the mark on this one Gary.  While the target audience was t
he Ham
community of WI, many others are interested in this issue.  I presently live i
n MN and
thus have no vote in WI, but I do own lake properity in WI and plan to put up
a tower
this year.  I might also add that this information is at least worthy of the b
andwidth
it occupies.  One doesn't have to look very far to see the *(&$#%^ postings fr
om folks
like K1OIK, KF4DDM, that have little good to offer the Ham community.  There i
s less and
less information of worth posted in the USENET Groups and it is becomming wors
e on a
daily basis.  Lets not flame posts that actually offer some information of wor
th.

Opinions expressed herein are my own and may not represent those of 3M.


From [e-mail] Tue Jan 30 16:14:39 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: Listserv@ucsd (Mailing List Processor)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: your LISTSERV request "help calculating transmission power"
Date: 29 Jan 96 16:24:44 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

The mailing list "calculating" could not be found.
You may use the INDEX command to get a listing
of available mailing lists.


From [e-mail] Tue Jan 30 16:14:40 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!msunews!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: dBi of 1/4 wave vertical?
Message-ID: <[e-mail]>
Organization: Organization? Me?
Date: Mon, 29 Jan 1996 17:19:02 GMT
Lines: 4
Sender: [e-mail]

Pls advise dBi gain (loss...) of your basic 1/4 wave vertical over a
groundplane?

73 Dave WB0GAZ [e-mail]


From [e-mail] Tue Jan 30 16:14:41 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Mon, 29 Jan 1996 18:45:53 GMT
Lines: 53
Xref: news.epix.net rec.radio.amateur.antenna:18727 rec.radio.amateur.misc:97454 rec.radio.amateur.policy:32861

In article <Pine.SOL.3.91.960129095837.2325A-100000-100000-100000-100000@qni.c
om> Gary Watts <[e-mail]> writes:
>Jim,
>
>I believe Gary is accessing the news-groups via a ham radio gateway/bbs
>Since being able to distro  a message to a specific area can be done
>in ham packet radio. I also checked with my provider and that is not
>a function that can be done with what we have here..
>
>I have seen many post from Gary in the past ALL of which was
>very informative. I guess that he was having a bad
>hair day when  he fired up his flame thrower
>
>Gary.... this is internet not ham packet radio !

No my boy, this is *usenet*, not internet or packet radio.
As a fully participating usenet site for many many years,
I tell you now that netnews articles have a header, and
that header has a Distribution line. If your lame software
*hides* that header from you, that's a problem you need
to address with your software provider and your site manager.

If your lame software hides the header, I'll reproduce the one for
this message here in the body text so you can see it.

Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur
.policy
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Summary:
Expires:
References: <Pine.SOL.3.91.960129095837.2325A-100000-100000-100000-100000@qni.
com>
Sender:
Reply-To: [e-mail] (Gary Coffman)
Followup-To:
Distribution:
Organization: Destructive Testing Systems
Keywords:


Now *that's* what a netnews header looks like. Every article
generates one. See that line labeled "Distribution:" up there?
That's your distribution line. If you leave it blank, the default
is "world", but if you put a local or regional code in there,
the distribution will be limited to that area.

It matters not one whit whether usenet is carried over internet,
uucp, packet radio, or two tin cans and a string. The *news*
software requires that header, and it's on every message.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Jan 30 16:14:42 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Rhombics at Low Heights?
Date: 29 Jan 1996 19:09:36 GMT
Organization: ELNEC/EZNEC Software
Lines: 24
Message-ID: <4ej61g$[e-mail]>
References: <4e95tn$[e-mail]>
NNTP-Posting-Host: ip-pdx06-04.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   Cecil Moore <[e-mail]> writes:
>  [e-mail] (Richard Karlquist) wrote:
>  >However, the vertical was 10 to 15 dB. down vs the dipole
>  >on the 1000 mile paths where I had gotten great reports on the dipole.

>  Hi Rick, I just picked up a college text on Electromagnetics by Joseph Edmi
nister.
>  Here's a quote: "As the monopole radiates power only in the region above th
e
>  conducting plane, the total radiated power is one-half that of the correspo
nding
>  dipole."  Where does the power go? :-)

>  73, Cecil, KG7BK, OOTC  (not speaking for my employer)

Let's ask where the power comes FROM. If we apply the same POWER to the
monopole and the dipole, the radiated powers are the same (assuming a
lossless situation for both). If we apply the same VOLTAGE to both
antennas, the monopole will radiate twice the power as the dipole
(because it will have twice the power applied). If we apply the same
CURRENT to both antennas, the monopole will radiate half the power as
the dipole (because it will have half the power applied). I presume
this is the condition assumed in the textbook. If not, we have a
question for Dr. Edminister.

Roy Lewallen, W7EL



From [e-mail] Tue Jan 30 16:14:43 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!news.kei.com!newsfeed.internetmci.com!in1.uu.net!inews.intel.com!itnews.sc.intel.com!chnews!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Testing co-axial filter
Date: 29 Jan 1996 19:43:23 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 13
Distribution: world
Message-ID: <4ej80r$[e-mail]>
References: <[e-mail]> <4eh1de$[e-mail]>
NNTP-Posting-Host: cmoore.ch.intel.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

[e-mail] (Tom Bruhns) wrote:

>the unloaded Q of a resonator made from this line would be about 260.  Now
>why would I want to use a 16" piece of this line to make a resonator with
>that Q, when I could just as well wind a coil half an inch in diameter and
>half an inch long and get just as high a Q?

Hi Tom, What's your opinion about shorted ladder-line stubs for HF vs say,
toroidal inductors?

thanks and 73, Cecil, KG7BK, OOTC  (not speaking for my employer)




From [e-mail] Tue Jan 30 16:14:44 1996
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!miwok!news.wco.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Why is man-made RFI vertically polarized?
Date: Tue, 30 Jan 1996 01:01:52 GMT
Organization: West Coast Online's News Server - Not responsible for content
Lines: 7
Message-ID: <4ejqm1$[e-mail]>
References: <4e8qfj$[e-mail]>
NNTP-Posting-Host: 206.99.115.44
X-Newsreader: Forte Free Agent 1.0.82

If your talking about things that ride ont he power lines - remember
that power lines have ground returns down the poles. Trying to find a
source - place an AM radio near the ground wire . The ground is an
excellent 40+ ft antenna... The other responses had valid points as
well. Good Luck
 Noland WB6CKT



From [e-mail] Tue Jan 30 16:14:45 1996
Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!usenet
From: [e-mail] (Bill Sohl)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Date: Tue, 30 Jan 1996 01:13:49 GMT
Organization: Planet Access Networks - Stanhope, NJ
Lines: 71
Message-ID: <4ejrb1$[e-mail]>
References: <4ecli3$[e-mail]> <[e-mail]>
NNTP-Posting-Host: stan21.planet.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.antenna:18726 rec.radio.amateur.misc:97451 rec.radio.amateur.policy:32859

[e-mail] (Gary Coffman) wrote:

>In article <4ecli3$[e-mail]> [e-mail] (Gary Schwart
z) writes:
>>If you don't live in Wisconsin, please excuse the bandwidth.

>There would be no need to ask our pardon if you'd properly set the
>Distribution header line in your message. The reason the Distribution
>attribute exists is so that messages of only local interest can be
>limited in distribution to only the local area. If you leave it blank,
>as I have in this posting, the default distribution is *world*. But there's
>no reason to leave it blank if your message is intended for a smaller
>audience.

>Each area has its local distribution codes, state codes, regional codes,
>country codes, and the default of world. If you don't know the proper
>distribution coding to use, ask your sysop. There's no use wasting
>the entire world's time with, for example, an announcement of your
>local BBS number in Los Angeles when a distribution of LA would limit
>it to only those who might care. Same with notices of exam sites for
>a locale, IE exam notices for Southern California should have a distribution
>attribute of SoCAL. And the same goes for the president of my local club who
>recently spammed the world about an event that should have been limited
>to an ATL distribution (or at most to a GA distribution). There's no good
>reason to spam the net when the tool to prevent that is available to you
>in *every message header*. It's just good nettiquette.

Actually, many people in any local area might miss postings with
limited distributions because their access is via an entity that
has a non-local site address.  Many examples come to mind
such as all those on AOL, Prodigy, Compuserve, etc.
There is but one local internet reference for prodigy.com
and yet (wherever that may be) prodigy.com serves users
throughout the USA (world?).  Likewise many other
providers, be they actual Internet Providers or perhaps
a major corporation (eg. say ibm.com) will be identifiable
as a single site location (a single gateway to that domain)
yet there may be users anywhere in the world.

Not meant as a flame, just a clarification.

Additionally, many people travel a great deal and may
like to know that a hamfest will be going on when
they visit a particular area, so if I were sending a post
announcing such an event, I sure wouldn't limit distribution
to anything less than USA, for the reasons just stated.

Bill Sohl K2UNK

>In the proximate case, there was enough of non-local interest in
>your post to justify the "world" distribution (or at least a
>USA distribution), but because that's true, you needn't beg
>forgiveness for using the bandwidth.

>Sorry to seem to be singling you out for this lecture, but yours
>is just the most recent of a number of posts of this nature. Please
>everyone, use the Distribution attribute properly for locale specific
>postings. If you don't know how, ask your provider. If he tells you
>his system won't permit it, demand he fix his system. Every usenet
>message has a Distribution attribute in the header, and every system
>has to have a way to set it to some value.

>Gary
>--
>Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
>Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
>534 Shannon Way             |    Guaranteed!      | [e-mail]
>Lawrenceville, GA 30244     |                     |

Bill Sohl  K2UNK
ARRL Local Gov't Liason, Mt. Olive Township, NJ



From [e-mail] Tue Jan 30 16:14:47 1996
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!swrinde!ihnp4.ucsd.edu!munnari.OZ.AU!comp.vuw.ac.nz!usenet
From: Richard Hulse <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: CCD antennas..how do I scale them (dowm!) ???
Date: 30 Jan 1996 01:42:22 GMT
Organization: Radio New Zealand
Lines: 14
Message-ID: <4ejt1u$[e-mail]>
NNTP-Posting-Host: kgill.dialup.netlink.co.nz
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Some years ago an antenna called the CCD (Constant Current Distribution)
was presented in, i think, 73 magazine. It utilised sections of wire
broken with equal spaced, equal value capacitors and had to be build for
a full wave on the lowest frequency of interest. Mine was 80m long!

Does anyone know how to scale these antennas to be a more manageable
size.?

Thanks.

Richard Hulse
ZL2AJC




From [e-mail] Tue Jan 30 16:14:48 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!news.gate.net!news-adm
From: [e-mail] (Doug Yarnold)
Newsgroups: rec.radio.amateur.antenna
Subject: Need HF Vertical
Date: Tue, 30 Jan 1996 03:28:50 GMT
Organization: CyberGate, Inc.
Lines: 4
Message-ID: <4ek269$[e-mail]>
NNTP-Posting-Host: wpbfl3-14.gate.net
X-Newsreader: Forte Free Agent 1.0.82

I'm looking for a good multi-band HF Vertical that I can mount on a
Radio Shack push -up pole.  Any ideas?
Please respond to     [e-mail]



From [e-mail] Tue Jan 30 16:14:49 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!ub!dsinc!netnews.upenn.edu!news
From: [e-mail] (Adam O'Donnell)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Best Ant for Packet & Satellite
Date: Tue, 30 Jan 1996 03:42:31 GMT
Organization: University of Pennsylvania
Lines: 14
Message-ID: <4ek3uu$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ts10-61.upenn.edu
X-Newsreader: Forte Free Agent 1.0.82

>   I do have a Hustler collinear that I bought used a couple of years =
>ago & have used on a piece of sheet metal with a mag mount in the attic =
>for packet - but is an eggbeater (or something similar) a wiser choice =
>to put up on the tower for my intended dual usage?

What kind of sats?  If you want to try the LEO packet birds, then
defintily go with the eggbeather.  If you want to do P3 birds, then
you are going to have to put up an entire array consisting of two
cross polarized antennas, one for 2m and another for 70cm.  Oh yeah,
don't forget the computer controlled dual axis rotators.

Have fun!




From [e-mail] Tue Jan 30 16:14:50 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!grouper.Exis.Net!usenet
From: [e-mail] (Your Real Name)
Newsgroups: uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.scanner,alt.radio.scanner,alt.radio.scanner.uk
Subject: Re: R7100 Modification
Date: 30 Jan 1996 03:58:40 GMT
Organization: Exchange Information Systems Networks
Lines: 67
Message-ID: <4ek51g$[e-mail]>
References: <4ejqb8$[e-mail]>
NNTP-Posting-Host: 38.exis.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11
Xref: news.epix.net uk.radio.amateur:10377 rec.radio.shortwave:69439 rec.radio.amateur.antenna:18730 rec.radio.amateur.equipment:24304 rec.radio.amateur.misc:97458 rec.radio.scanner:44635 alt.radio.scanner:26989 alt.radio.scanner.uk:2057

In article <4ejqb8$[e-mail]>, . says...
>
>Ever since ICOM decided to delete the 800 - 900 MHZ coverage from its IC-R710
0
>receiver,
>older R7100's demand premium prices on the used market. ICOM insisted that th
e
>R7100 was
>now made in two versions, one for the general public and another (with 800-90
0
>coverage) for
>government and law enforcement agencies. The extended coverage version also s
ells
>for $200-$300 more! Per discussions with ICOM there were very clear that this
 was
>done to comply with
>legal requirements that prohibit new scanners from be capable of receiving
>cellular telephone
>transmissions. My opposition has always been why we should be penalized if we
 want
>to listen to
>local law enforcement agencies within the 800 MHz band. Personally, I have no

>interest in
>listening to cell phones when a receiver as competent as the R7100 opens up a
lmost
>2 ghz of
>spectrum.
>
>I recently noticed that Grove now offers the R7100 with "restored" coverage s
o I
>set out to find
>out how it was done. Performing the following procedure will allow you to lis
ten
>to local law
>enforcement with the 800-900 mHz portion of the spectrum. Remove the screws t
hat
>hold the top
>cover and disconnect the speaker. Next, remove the two flat head screws that
hold
>the metal
>shield covering the rear of the front panel.. On the rear apron, remove the t
wo
>screws that hold
>the upper chassis to the lower chassis. Finally, remove the antenna cable tha
t is
>connected to the
>circuit board assembly in the rear right corner of the R7100. Referring to th
e
>owners manual,
>CAREFULLY separate the upper half of the receiver, inverting it, setting it b
eside
>the radio as
>illustrated in the owners manual. Be careful not to pull on the cables that
>connect the upper
>portion to the lower half of the radio. In the front of the owners manual the
re is
>a small paragraph
>that explains the various jumper options for the R7100's CI-V interface optio
ns.
>It's on this board
>that the modification is done. The board is located behind the "M-SET" switch
. The
>jumpers are
>actually circular pads, split vertically. A drop of solder constitutes a jump
er -
>no solder = no
>jumper.
>
>Locate jumper "A6" as illustrated in the owners manual. Above "A6" you'll see
 a
>small ball of
>solder. Using solder wick, CAREFULLY remove the solder, exposing the split
>circular pad
>beneath. The space between the pads is very small so be sure to remove all th
e
>solder. Reassemble
>the radio and you're done!
>
>Blackshadow
>

   Many thanks my friend who ever you are.  I am curious to know who "Grove" i
s that
you mention.  Could you comment on this?  I am in the Two-way radio service bu
siness
and have need of this blocked range of frequencies to monitor for interference
 . I
thought for a while I was going to have to resort to a R9000 which is awfully
expensive.  Again many thanks.  I would like to hear from you here or on my E-
Mail
[e-mail]



From [e-mail] Tue Jan 30 16:14:51 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!wb3ffv!ppp48.bcpl.lib.md.us!dbaker
From: [e-mail] (Donald I. Baker)
Subject: Re: 82 Repeater in Kansas City
Sender: [e-mail]
Message-ID: <[e-mail]>
Date: Tue, 30 Jan 1996 10:21:39 GMT
X-Nntp-Posting-Host: ppp48.bcpl.lib.md.us
References: <4efpb3$[e-mail]> <[e-mail]> <[e-mail]>
Organization: Reville Engineering Services
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]
Lines: 47
Xref: news.epix.net rec.radio.amateur.policy:32876 rec.radio.amateur.antenna:18735 rec.radio.amateur.equipment:24320 rec.radio.amateur.homebrew:13023 rec.radio.amateur.digital.misc:13847

In article <[e-mail]> [e-mail] (Rob Janssen) writ
es:
>From: [e-mail] (Rob Janssen)
>Subject: Re: 82 Repeater in Kansas City
>Date: Tue, 30 Jan 1996 09:24:14 GMT

>In <[e-mail]> Eddie Caffray <[e-mail]> writ
es:

>> On the 146.85 repeater here in Central NY we had trouble with one user also
. He made it that
>>no one would even monitor the reapeater anymore. The club voted to ban him a
nd we did. The
>>reapeater is a great place to be again.

>How do you manage to effectively ban malicious users from a repeater?
>Of course this problem is known all over the world, but at least over
>here we have not yet found an effective way of stopping them.  How do
>you do that?

>Rob
>--
>+------------------------------------+--------------------------------------+
>| Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
>| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
>+------------------------------------+--------------------------------------+


Technical solutions do exist.  Using a "TX-ID" board, which uniquely
fingerprints each transmitter and a PC one can "slectively" include or
preclude individual users.

The board was not meant for that purpose, but with just a little Basic of C
codes, it workd just fine.  It is especially easy if you have a single or
limited number of receive site.

Good luck and Have fun.

Don




Donald I. Baker
Reville Engineering Services
4619 Schenley Road
Baltimore, MD 21210-2525
[phone]
Custon Harsh Environment
Computers and RF Products
"Where no PC has gone before..."


From [e-mail] Tue Jan 30 16:14:53 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4ecli3$[e-mail]> <[e-mail]> <[e-mail]>
Date: Tue, 30 Jan 1996 15:09:21 GMT
Lines: 52
Xref: news.epix.net rec.radio.amateur.antenna:18734 rec.radio.amateur.misc:97477 rec.radio.amateur.policy:32875

In article <[e-mail]> [e-mail] (Gary Hosler - KN0Z) writes
:
>Gary Coffman wrote:
>>
>> In article <4ecli3$[e-mail]> [e-mail] (Gary Schwa
rtz) writes:
>> >If you don't live in Wisconsin, please excuse the bandwidth.
>>
>> There would be no need to ask our pardon if you'd properly set the
>> Distribution header line in your message. The reason the Distribution
>> attribute exists is so that messages of only local interest can be
>> limited in distribution to only the local area. If you leave it blank,
>> as I have in this posting, the default distribution is *world*. But there's
>> no reason to leave it blank if your message is intended for a smaller
>> audience.
>> -------SNIP------
>>
>> Sorry to seem to be singling you out for this lecture, but yours
>> is just the most recent of a number of posts of this nature.-------SNIP----
--
>
>I think you missed the mark on this one Gary.  While the target audience was
the Ham
>community of WI, many others are interested in this issue.  I presently live
in MN and
>thus have no vote in WI, but I do own lake properity in WI and plan to put up
 a tower
>this year.  I might also add that this information is at least worthy of the
bandwidth
>it occupies.  One doesn't have to look very far to see the *(&$#%^ postings f
rom folks
>like K1OIK, KF4DDM, that have little good to offer the Ham community.  There
is less and
>less information of worth posted in the USENET Groups and it is becomming wor
se on a
>daily basis.  Lets not flame posts that actually offer some information of wo
rth.
>Opinions expressed herein are my own and may not represent those of 3M.


If you'd have done a bit less creative snipping and a little more reading,
you'd have noted the following in the message you partially quote.

[I wrote]
>In the proximate case, there was enough of non-local interest in
>your post to justify the "world" distribution (or at least a
>USA distribution), but because that's true, you needn't beg
>forgiveness for using the bandwidth.

Now that doesn't look like I'm telling him to restrict distribution
on his note now does it? Makes your complaint look a little foolish,
doesn't it?

(And BTW while I'm in the mood, try to use a linefeed at intervals
of less than 80 characters when you post. It'll make the quoted text
format *so* much better.)

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Mon Feb 05 21:18:54 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Dennis Chambers)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Ham-Ant Digest V96 #29
Date: 25 Jan 96 21:15:47 GMT
Organization: ucsd usenet gateway
Lines: 22
Message-ID: <199601260015.SAA01499@orions0>
Reply-To: [e-mail] (Dennis Chambers)
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Date: Tue, 23 Jan 1996 18:12:52 -0800
From: [e-mail] (Bob Butler)
Subject: Feed Line - Ethernet Coax

I think this has been discussed in the past, but does anyone know how well
IEEE 802.3 (82959) Ethernet 10base5 cable works as transmission feed line
compared to something like RG-8U?  Are they fairly comparable as far as signal
loss goes in the 2m band?  It definitely has to be better the RG-58U I'm
using now, which is about 5db loss/100' @ 146mhz.  Thanks for any info or
comments.

I don't see a problem in using it.  On every network I have setup the coax inc
luded
was either RG-58U or RG-8.  Infact my 440 antennae is using leftover coax from
 a
job I did.  I get a kick out of it because I am the only Ham in my area that I
 know of using Yellow RG-8!   :)
                        73's !



Dennis Chambers
E-mail:  [e-mail]
Callsign:  N0UDZ



From [e-mail] Mon Feb 05 21:18:55 1996
Path: news.epix.net!uunet!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Feed Line - Ethernet Coax
Date: Thu, 25 Jan 96 21:20:59 -0500
Organization: Delphi ([e-mail] email, 800-695-4005 voice)
Lines: 5
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: bos1d.delphi.com
X-To: Bob Butler <[e-mail]>

The specs are the same as RG-8F (foam) which is better than
RG-8. Unfortunately, it is not UV protected and will fall apart
yearly in Arizona.

73, Cecil, KG7BK, OOTC


From [e-mail] Mon Feb 05 21:18:56 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail
From: [e-mail] (Dave Mann)
Subject: Re: MFJ SWR Analyzers - Any users?
Message-ID: <1197cc$[e-mail]>
Date: Thu, 25 Jan 1996 22:44:13 GMT
Reply-To: [e-mail]
References: <4dbe97$[e-mail]> <4dkpgd$[e-mail]>
X-Newsreader: Forte Free Agent 1.0.82
Lines: 19

RE: MFJ-259 SWR Analyzer ... Our friend K8MFO brought one with him to
VP2E a couple of months ago and is was GREAT!  I used it to sort
through all kinds of pieces of damaged and undamaged coax, several
yagi antennas, 3 verticals, discovered my R7 was mistuned, tested and
retuned a 160 meter dipole, and did about 3 or 4 2 meter anteannas.
All in about 4 days.  This was terrific help to us, after Hurricane
LUIS managed to blow everything down and around.  If I had the money,
you can be SURE I would buy one of the MFJ Analyzers.  I had never
used one before, and it took me about 10 seconds to figure out how to
use it.  Also, without reading the instructions, figured out how to
test coax with a dummy load at one end, and all kinds of other great
stuff.  Hats Off to MFJ!

best 73's
Dave, VP2EHF
Dorothea, VP2EE
Little Harbour, Anguilla, British West Indies





From [e-mail] Mon Feb 05 21:18:57 1996
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From: Danie Brynard <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: design for rotary dipole 40m
Date: 26 Jan 1996 08:49:32 GMT
Organization: PiX - Proxima information X-change
Lines: 19
Message-ID: <4ea4is$[e-mail]>
NNTP-Posting-Host: net-4.pta.pix.za
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

I am looking for a practical design for a rotary dipole for 40 and
20m. I would like to build it out of Alu pipe and rotate it on a
mast with a HAM 4 rotator,

Any ideas, articles on this topic ?

73 danie zs6awk

__________________________________
Danie Brynard (ZS6AWK)
PO BOX 15133
Centurion
0140
South Africa
Email: [e-mail]
Tel/Fax: [phone]
__________________________________




From [e-mail] Mon Feb 05 21:18:57 1996
Path: news.epix.net!news.sprintlink.net!zilker.net!halley!news.mpd.tandem.com!tandem!pacbell.com!ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!in1.uu.net!prodigy.com!usenet
From: [e-mail] (Sterling Reed)
Newsgroups: rec.radio.amateur.antenna
Subject: WIRE TOO CB
Date: 26 Jan 1996 23:04:29 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 5
Distribution: world
Message-ID: <4ebmlt$[e-mail]>
NNTP-Posting-Host: inugap5.news.prodigy.com
X-Newsreader: Version 1.2

TO HE PEEEEEE
-
  STERLING REED  [e-mail]




From [e-mail] Mon Feb 05 21:18:59 1996
Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!delta.misha.net!news.enteract.com!news.inap.net!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!primus.ac.net!news.cais.net!news.structured.net!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: QRP Tuner
Date: 27 Jan 1996 22:34:06 GMT
Organization: ELNEC/EZNEC Software
Lines: 32
Message-ID: <4ee98u$[e-mail]>
References: <4e79p1$[e-mail]>
NNTP-Posting-Host: ip-pdx02-33.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   Ron Giuntini <rong@204.160.88.10> writes:
>  Anyone have any suggestions on the best tuner for a 2 watt CW QRP rig?  I
>  am looking for something small, efficient and reasonable in price.  I
>  have looked at the MFJ catalogue but am unable to figure out which is
>  best for this purpose.  I would like to hear from any satisfied users.  I
>  have always been a little bit shy about using a tuner since my thought
>  was that it would be another power robbing device in the line.  Now that
>  I am going to be using QRP power levels I am concerned about this even
>  more.  Does anyone think using one is a bad idea?  Maybe some article in
>  QST would solve my problem. I could build it if I knew which issue might
>  have one in it.  E mail me at [e-mail] or reply here. Thanks for
>  reading this message.

You may find, as I have, that the small loss in a good tuner is smaller than
the power or efficiency reduction you get feeding your rig to a less than
perfectly matched load. Mine also doubles as an output indicator and tells
me if the antenna is broken.

For many years I've used a variation of a simple highpass T network shown in
Solid State Design for the Radio Amateur (Fig. 60, P. 167). It includes a
simple bridge for adjustment. I switch in parallel inductors for 20 and 15m.
I found the loss to be excessive on 15 until I lowered the Q by increasing
the capacitor values by about a factor of two, and lowering the L by the same
factor. Now it's a fraction of a dB on 40, 20, and 15. I don't use the 75 pF
shunt capacitor shown on the schematic, and I added a 33k resistor from the
top of S1 to the bottom of the left side of S1A so the meter will also serve
as an output indicator. The whole thing is about the size of a pack of
cigarettes (the same size as my original "Optimized" transceiver).

73,
Roy Lewallen, W7EL



From [e-mail] Mon Feb 05 21:19:00 1996
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!in2.uu.net!insync!news.hal-pc.org!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: CB to Ham Transformation.
Date: 27 Jan 1996 22:45:17 GMT
Organization: Houston Area League of PC Users
Lines: 53
Message-ID: <4ee9tt$[e-mail]>
References: <4e9s0c$[e-mail]>
NNTP-Posting-Host: pm1-87.hal-pc.org
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   Joe Fitter   BV/N0IAT <[e-mail]> writes:
>
>
>  Anyone out here in Rec.Radio land able to help Alex?  How about anyone
>  in the NYC area?  Please email to the below address, not the one in
>  the top of this message (it was posted elsewhere).


Try calling the educational office of the ARRL at 860-594-0301.  Tell them
you are interested in getting involved in amateur radio.  They will be more
than happy to give you more information than you knew existed.  This will
include the phone numbers of some local radio clubs.


>  Thanks in advance to any elmer who helps.  Joe
>
>  ----------------------------------------
>  [e-mail] (Alex948739) wrote:
>  The reason I did not get my licence is because I am only 15. When I have
>  time to study and learn stuff, I will get a licence.

It is a lot easier to get your license now.

 I was wondering, can
>  you transform portable CB radio that I have from GE to Ham? How did you
>  transformed it?Is it a good ham or a bad ham?

The simple answer is no.


 Also, on cb since i live in
>  NY i hear alot of spanish itallian people speaking in other languages on
>  most channels and there is alot of profanity. I am wondering is there
>  anythink like that on HAm?

Again, the answer is no.  It is against the law and 99.5% of us hams are law a
biding.
But profanity is the major reason that cb'ers move up to amateur radio.

Please send me plans on how to transform.
>                                                                 Thank You

I teach amateur radio courses down here in Houston.  But if you would
contact the ARRL, they would be more than glad to help you get licensed.
Call 860-594-0200 or email at <http://www.arrl.org/>.

Good luck and 73

+++++++++++++++++++++++++++++++++++++
Sid George, CPA     [e-mail]

http://www.hal-pc.org/~sid
-------------------------------------



From [e-mail] Mon Feb 05 21:19:00 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!uwm.edu!cs.utexas.edu!howland.reston.ans.net!math.ohio-state.edu!usc!newshub.cts.com!usenet
From: "Harvey Hiller, KD6QK" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: design for rotary dipole 40m
Date: 28 Jan 1996 06:38:43 GMT
Organization: The Fixit-Man
Lines: 13
Message-ID: <4ef5lj$[e-mail]>
References: <4ea4is$[e-mail]>
NNTP-Posting-Host: kd6qk.cts.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]

Hi Danie

Read your request for info on 40M rotatable dipole.

If you received any responses I would like to know if you
received anything credible.  Please provide any info you can.

Thanks in advance.

73
Harv, KD6QK
San Diego, CA



From [e-mail] Mon Feb 05 21:19:01 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!howland.reston.ans.net!math.ohio-state.edu!usc!newshub.cts.com!usenet
From: "Harvey Hiller, KD6QK" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: design for rotary dipole 40m
Date: 28 Jan 1996 06:40:41 GMT
Organization: The Fixit-Man
Lines: 13
Message-ID: <4ef5p9$[e-mail]>
References: <4ea4is$[e-mail]>
NNTP-Posting-Host: kd6qk.cts.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]

Hi Danie

Read your request for info on 40M rotatable dipole.

If you received any responses I would like to know if you
received anything credible.  Please provide any info you can.

Thanks in advance.

73
Harv, KD6QK
San Diego, CA



From [e-mail] Mon Feb 05 21:19:02 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!math.ohio-state.edu!usc!newshub.cts.com!usenet
From: "Harvey Hiller, KD6QK" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: design for rotary dipole 40m
Date: 28 Jan 1996 06:40:42 GMT
Organization: The Fixit-Man
Lines: 13
Message-ID: <4ef5pa$[e-mail]>
References: <4ea4is$[e-mail]>
NNTP-Posting-Host: kd6qk.cts.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]

Hi Danie

Read your request for info on 40M rotatable dipole.

If you received any responses I would like to know if you
received anything credible.  Please provide any info you can.

Thanks in advance.

73
Harv, KD6QK
San Diego, CA



From [e-mail] Mon Feb 05 21:19:03 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!gatech!newsfeed.internetmci.com!news.wco.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 72 ohm twin lead ??
Date: Sun, 28 Jan 1996 16:22:05 GMT
Organization: West Coast Online's News Server - Not responsible for content
Lines: 6
Message-ID: <4eg7rg$[e-mail]>
References: <4due16$[e-mail]>
NNTP-Posting-Host: 206.99.115.42
X-Newsreader: Forte Free Agent 1.0.82

Greg is right - the generally accepted value for zipcord is 75 ohms -
obviously - its close but may vary from cord to cord...However, I
think regular lamp cord is in that range
Noland WB6CKT
Good luck Greg - cu on the air



From [e-mail] Mon Feb 05 21:19:04 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!microvst.demon.co.uk
From: "Anthony R. Gold" <[e-mail]>
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: 82 Repeater in Kansas City
Date: Sun, 28 Jan 96 17:22:55 GMT
Organization: Microvest Limited, London
Lines: 19
Message-ID: <[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: microvst.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: microvst.demon.co.uk
Xref: news.epix.net rec.radio.amateur.policy:32944 rec.radio.amateur.antenna:18812 rec.radio.amateur.equipment:24433 rec.radio.amateur.homebrew:13071 rec.radio.amateur.digital.misc:13903

In article <[e-mail]>
           [e-mail] "Eddie Caffray" writes:

> On the 146.85 repeater here in Central NY we had trouble with one user
> also. He made it that no one would even monitor the reapeater anymore. The
> club voted to ban him and we did. The reapeater is a great place to be
> again.

That's a weird story.  The jerk behaves badly enough to be banned but is
obedient enough to obey your request that he voluntarily not transmit on
the legally licensed (input) frequency.  Were there some strong words of
`encouragement' that went with the banning?

Regards,
--
   Tony - G3SKR / AA2PM                  email: [e-mail]
                                                [e-mail]
                                        packet: g3skr@n0ary.#nocal.ca.usa.na


From [e-mail] Mon Feb 05 21:19:05 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!li.net!bbruhns
From: [e-mail] (Bob Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Why is man-made RFI vertically polarized?
Date: 28 Jan 1996 18:43:25 GMT
Organization: LI Net (Long Island Network)
Lines: 19
Message-ID: <4egg4d$[e-mail]>
NNTP-Posting-Host: linet04.li.net
X-Newsreader: TIN [version 1.2 PL2]

  Of course, it depends on what you mean by RFI, etc, etc, etc.  What is
meant here is unintentional RF crud from electric motors, furnace
arc-starters, computers, etc.

  This sort of RFI starts out pretty much randomly polarized, heading out
in all directions.  It's really too weak to propagate very far, so only
the local ground wave is usually of any importance.  Now, the groundwave
propagates along the moderately conductive surface of the earth, and this
has the effect of attenuating the horizontally polarized component of the
signal much faster than the vertical component, because the reflection
from the earth's surface is 180 degrees out of phase with the direct
signal for horizontally polarized groundwave and it quickly gets
cancelled out.  However, this reflection is in-phase for vertically
polarized groundwave, so it propagates relatively happily.  The result is
that the RFI you get from neighborhood gadgets is mostly vertically
polarized.

  Bob Bruhns, WA3WDR, [e-mail]



From [e-mail] Mon Feb 05 21:19:06 1996
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.jersey.net!news.win.bright.net!brutus.bright.net!chi-news.cic.net!newsfeed.internetmci.com!news.flinet.com!usenet
From: [e-mail] (KE4WBW)
Newsgroups: rec.radio.amateur.antenna
Subject: Loops!!!!
Date: 28 Jan 1996 23:20:51 GMT
Organization: Florida Internet
Lines: 10
Message-ID: <4eh0ck$[e-mail]>
NNTP-Posting-Host: wpb22.flinet.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

  Have just installed my Horiz. Loop and am extremely inpressed with its
performance.
  However: I fed it with 50ohm coax and am running it without a tuner. Some
people have said that it is best fed with 75ohm coax.
  Does any one have info. on this? or maybe the radiation resistance so I
might be able to construct a balun?
--
Henry Silvia        [e-mail]
{KE4WBW}            WPB. FLA



From [e-mail] Mon Feb 05 21:19:07 1996
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From: Richard Hulse <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: (no subject)
Date: 29 Jan 1996 00:00:09 GMT
Organization: Netlink
Lines: 19
Message-ID: <4eh2m9$[e-mail]>
NNTP-Posting-Host: kgill.dialup.netlink.co.nz
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Some years ago an antenna called the CCD (Constant Current Distribution)
was presented in, i think, 73 magazine. It utilised sections of wire
broken with equal spaced, equal value capacitors and had to be build for
a full wave on the lowest frequency of interest. Mine was 80m long!

I've mislaid the original article in a house shift so two questions..

1. Where were the original articles published (so I can get new copies)?

and

2. Does anyone know how to scale these antenna to be a more manageable
size.?

Thanks.

Richard Hulse
ZL2AJC



From [e-mail] Mon Feb 05 21:19:08 1996
Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.luc.edu!uchinews!uwvax!tricia!news.atw.fullfeed.com!dennis
From: [e-mail] (Dennis Nuetzel)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Looking for info on legal cases involving commercial antenna-tower construction
Date: Mon, 29 Jan 96 04:18:17 GMT
Organization: FullFeed Communications, Appleton, WI, USA, Sol-3
Lines: 31
Message-ID: <4ehhr3$[e-mail]>
References: <4dk20l$[e-mail]> <4dq9b5$[e-mail]> <4e9oij$[e-mail]> <4ebu1f$[e-mail]>
NNTP-Posting-Host: dennis.atw.fullfeed.com
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <4ebu1f$[e-mail]>,
   [e-mail] (Clark Savage Turner) wrote:

>>Nope. The FCC has ruled that local government must make "reasonable
>>allowances" for antennas. The ruling dealt with Amateur Radio
Stations,
>>if I remember correctly.  However, they did not say that local
agencies
>>had no say - not the "reasonable". Basically, it means that antennas
>>cannot be prohibited by local governments - but they can still limit
>>the size of the antennas and towers.


   Thank you Bill.  I was not aware of this ruling.  A couple of years
ago I was involved in an incedent where a Green Bay, WI alderman was
trying to get rid of a person in the neighborhood who was a ham.  One
of the things cited was the antenna on the roof, and the "Jolly Roger"
(skull & croosbones) flag that was attached.  The flag was sort of a
semi-humorous, semi-serious type of defiance measure by the ham, since
the ham was doing nothing illegal.  The problem stemmed from the fact
that the alderman didn't like the ham, and wanted the ham out of his
neighborhood, and the only thing he could use to cause trouble was the
antenna.  The ham is a friend of mine, so I contacted the F.C.C., when
the alderman tried to cause a stink, and the City Attorney claimed
that it was local jurisdiction.  A F.C.C. lawyer sent me a pack with
the court case Carino v. Deerfield, New York.
   Again, thanks for the heads-up.

   Dennis




From [e-mail] Mon Feb 05 21:19:09 1996
Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!ub!news.kei.com!newsfeed.internetmci.com!news1.isp.net!news.isp.net!news.14.227!not-for-mail
From: [e-mail] (Mike Kapitan)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Gap Antennas
Date: Mon, 29 Jan 1996 13:32:13 -0800
Lines: 8
Message-ID: <4eje9p$lki@14.227>
References: <4dfj24$[e-mail]> <Pine.BSD/[e-mail]> <[e-mail]> <4eiae6$[e-mail]>
NNTP-Posting-Host: 206.29.14.227
NNTP-NEWS-ADMIN: newsadmin@14.227
X-Newsreader: Value-Added NewsWatcher 2.0d31h+

Have a Gap Eagle and am extrememly disappointed .... good SWR on all bands
but EXTREMELY inefficient and generally a poor performer ... wouldn't buy
another one. Aside from its' poor electrical performance, physically it's
not well constructed either.

Hope this helps,

Mike KM6WB


From [e-mail] Mon Feb 05 21:19:10 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!uunet!in2.uu.net!news.new-york.net!solaris.cc.vt.edu!newsfeed.internetmci.com!swrinde!news.uh.edu!news.sfasu.edu!titan.sfasu.edu!z_stuadr
From: [e-mail]
Subject: Help findind part 95
Message-ID: <[e-mail]>
Date: 29 Jan 96 15:57:49 CST
Organization: Stephen F. Austin State University
Lines: 36

Path: titan.sfasu.edu!z_stuadr
From: [e-mail]
Newsgroups: rec.radio.info
Subject: Part 95, please help locate
Message-ID: <[e-mail]>
Date: 29 Jan 96 15:55:24 CST
Organization: Stephen F. Austin State University
Lines: 27

Path: titan.sfasu.edu!z_stuadr
From: [e-mail]
Newsgroups: rec.radio.cb
Subject: Request for part 95
Message-ID: <[e-mail]>
Date: 29 Jan 96 14:17:10 CST
Organization: Stephen F. Austin State University
Lines: 18

Greetings to all

I would appreciate it if any body could point me to a web site that contains
the following: Title 47 chapter 1 subchapter D part 95.
The above is the Code of Federal Regulations relating to general moblie radios
.
It also contains the rules for CB radios.  I have searchd serval web sites
including Cornell Law School's website.  I would like to download part 95 of
the regulations in its entireity.

A footnote to this request.  It sure is easy to find part 97 which is the rule
s
for amatuer radios.  Their must be a lot of ham operators on the internet.

Please help if you can.  Thanks in advance.

David Stua
Stephen F. Austin University
Nacogdoches, Texas
CB handler is "Dogstar"



From [e-mail] Mon Feb 05 21:19:11 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!uunet!in2.uu.net!news.new-york.net!solaris.cc.vt.edu!newsfeed.internetmci.com!swrinde!news.uh.edu!news.sfasu.edu!titan.sfasu.edu!z_stuadr
From: [e-mail]
Subject: Re: Help findind part 95
Message-ID: <[e-mail]>
Date: 29 Jan 96 16:04:17 CST
References: <[e-mail]>
Organization: Stephen F. Austin State University
Lines: 41

In article <[e-mail]>, [e-mail] writes
:
> Path: titan.sfasu.edu!z_stuadr
> From: [e-mail]
> Newsgroups: rec.radio.info
> Subject: Part 95, please help locate
> Message-ID: <[e-mail]>
> Date: 29 Jan 96 15:55:24 CST
> Organization: Stephen F. Austin State University
> Lines: 27
>
> Path: titan.sfasu.edu!z_stuadr
> From: [e-mail]
> Newsgroups: rec.radio.cb
> Subject: Request for part 95
> Message-ID: <[e-mail]>
> Date: 29 Jan 96 14:17:10 CST
> Organization: Stephen F. Austin State University
> Lines: 18
>
> Greetings to all
>
> I would appreciate it if any body could point me to a web site that contains
> the following: Title 47 chapter 1 subchapter D part 95.
> The above is the Code of Federal Regulations relating to general moblie radi
os.
> It also contains the rules for CB radios.  I have searchd serval web sites
> including Cornell Law School's website.  I would like to download part 95 of
> the regulations in its entireity.
>
> A footnote to this request.  It sure is easy to find part 97 which is the ru
les
> for amatuer radios.  Their must be a lot of ham operators on the internet.
>
> Please help if you can.  Thanks in advance.
>
> David Stua
> Stephen F. Austin University
> Nacogdoches, Texas
> CB handler is "Dogstar"
>






From [e-mail] Mon Feb 05 21:19:12 1996
Path: news.epix.net!uunet!in1.uu.net!news.spss.com!uchinews!news.luc.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (David, Michaela & Benjamin)
Newsgroups: rec.radio.amateur.antenna
Subject: Best Ant for Packet & Satellite
Date: 29 Jan 96 16:22:16 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

   I am in a low spot (200 feet above sea level) & have a 90 foot tower =
plus mast to get me to 300.  I am surrounded within 20 miles by hills =
between 300 and 450 feet high.

   I'd like to put an antenna at the top of the mast that will serve =
well for general 2 meter packet and satellite work.  Recommendations?

   I do have an 11 element 2 meter Cushcraft up that is vertically =
polarized at the moment, but it is a pain to keep swinging it when not =
really necessary but for its inherent directionality.

   I do have a Hustler collinear that I bought used a couple of years =
ago & have used on a piece of sheet metal with a mag mount in the attic =
for packet - but is an eggbeater (or something similar) a wiser choice =
to put up on the tower for my intended dual usage?

   All suggestions are very much appreciated.

   73, David AA1FA


From [e-mail] Mon Feb 05 21:19:13 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!castle.nando.net!news
From: [e-mail] (George McCrary)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Ground Radials...?
Date: Mon, 29 Jan 1996 17:41:49 GMT
Organization: News & Observer Public Access
Lines: 16
Message-ID: <4ej0tn$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: grail517.nando.net
X-Newsreader: Forte Agent .99a.107


1. Buy the ARRL Antenna book.

2. Read it.

3. Ignore 50% of what anybody tells you, and doubt the other 50%.


There is no use in putting more than one non-resonant radial in the
same place. If the radials are resonant they need to be at least six
feet in the air.

Buy or borrow the book.

                                        73 DE KQ4QM (George)



From [e-mail] Mon Feb 05 21:19:14 1996
Path: news.epix.net!news.sprintlink.net!nntp.inc.net!novia!news.dpc.net!news.heurikon.com!uwvax!frankensun.altair.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs
From: [e-mail] (Robert Smits)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: (no subject)
Message-ID: <[e-mail]>
Date: Mon, 29 Jan 1996 18:34:00 PST
References: <4eh2m9$[e-mail]>
Reply-To: [e-mail]
Distribution: world
Organization: The Curmudgeon's Cottage
X-Newsreader: Rnf 0.79b6
Lines: 38

Richard Hulse <[e-mail]> writes:

>Some years ago an antenna called the CCD (Constant Current Distribution)
>was presented in, i think, 73 magazine. It utilised sections of wire
>broken with equal spaced, equal value capacitors and had to be build for
>a full wave on the lowest frequency of interest. Mine was 80m long!
>
>I've mislaid the original article in a house shift so two questions..
>
>1. Where were the original articles published (so I can get new copies)?
>

The following articles are about the CCD:

H.A. Mills and G Brizendine, "Antenna Design: Something New!", 73, October
1978, pp 282-289

D. Atkins, "The High Performance, Capacitively Loaded Dipole", Ham Radio,
May 1984, pp 33-35

The material is also revisited in the ARRL Antenna Compendium, Volume 2,
which includes a Basic program to calculate CCD Dipoles, and the ARRL
Antenna Comendium, Volume 3 has an article analyzing its performance.

>and
>
>2. Does anyone know how to scale these antenna to be a more manageable
>size.?

The program askes for what frequency you'd like to make the antenna. I
don't know how well it scales from personal experience, though.

Bob, VE7HS
--
[e-mail]

The undisputed fame enjoyed by Shakespeare as a writer.....
is like every other lie, a great evil. Tolstoy


From [e-mail] Mon Feb 05 21:19:15 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs
From: [e-mail] (Robert Smits)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.po
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Message-ID: <[e-mail]>
Date: Mon, 29 Jan 1996 18:44:00 PST
References: <[e-mail]>
Reply-To: [e-mail]
Distribution: world
Organization: The Curmudgeon's Cottage
X-Newsreader: Rnf 0.79b6
Lines: 33
Xref: news.epix.net rec.radio.amateur.antenna:18886 rec.radio.amateur.misc:97717

Gary Watts <[e-mail]> writes:

>
>Jim,
>
>I believe Gary is accessing the news-groups via a ham radio gateway/bbs
>Since being able to distro  a message to a specific area can be done
>in ham packet radio. I also checked with my provider and that is not
>a function that can be done with what we have here..

Being able to set distribution is possible with virtually all properly
functioning usenet newsreaders. If your provider doesn't know how (as
opposed to can't be bothered to lead you through it) he shouldn't be
imitating a service provider.

>>I have seen many post from Gary in the past ALL of which was
>very informative. I guess that he was having a bad
>hair day when  he fired up his flame thrower
>
>Gary.... this is internet not ham packet radio !

GC seems to realize that just fine, although you don't. Any properly
configured newsreader ought to allow you to set the distribution header.

It's not the reader's fault if the service provider hasn't set it up that
way, of course, but the reader should nag his provider to do so.

Using the distribution header properly is a GOOD way to reduce unnecessary
costs to the overall network.
--
[e-mail]

Man is the only animal that blushes. Or needs to. Mark Twain


From [e-mail] Mon Feb 05 21:19:16 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!news.sprintlink.net!news1.sunbelt.net!ags-r1-p2.groupz.net!flanders
From: [e-mail] (Jerry Flanders)
Newsgroups: rec.radio.amateur.antenna
Subject: ANTENNA MODELING SOFTWARE FOR WINDOWS
Date: Mon, 29 Jan 1996 20:15:44 Eastern
Organization: SunBelt.Net INTERNET Access
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: ags-r1-p2.groupz.net
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

There is a neat "try-before-buy" package of antenna modeling software
 for windows available at

http://www.funet.fi/pub/ham/antenna/NEC/

the file is NEC-WIN.ZIP

It is about 1.3 megs, so it takes awhile to download.

I just got it recently, and have only started evaluating it. If someone
else has already looked it over, I would appreciate hearing from you.
I had been looking for a way to visualize the output of the generic
mininec3. At first glance, this package looks like a lot more than I was
hoping for.

Jerry Flanders    W4UKU    South Carolina    [e-mail]


From [e-mail] Mon Feb 05 21:19:18 1996
Path: news.epix.net!news.sprintlink.net!nntp.inc.net!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!usenet
From: "Dana H. Myers" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Date: 29 Jan 1996 20:42:13 GMT
Organization: Sunsoft, Los Angeles
Lines: 59
Message-ID: <4ejbf5$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: vr1000p.west.sun.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1 (X11; I; SunOS 5.5 i86pc)
X-URL: news:[e-mail]
Xref: news.epix.net rec.radio.amateur.antenna:18774 rec.radio.amateur.misc:97552 rec.radio.amateur.policy:32916

[e-mail] (Gary Coffman) wrote:
>In article <Pine.SOL.3.91.960129095837.2325A-100000-100000-100000-100000@qni.
com> Gary Watts <[e-mail]> writes:
>>Jim,
>>
>>I believe Gary is accessing the news-groups via a ham radio gateway/bbs
>>Since being able to distro  a message to a specific area can be done
>>in ham packet radio. I also checked with my provider and that is not
>>a function that can be done with what we have here..
>>
>>I have seen many post from Gary in the past ALL of which was
>>very informative. I guess that he was having a bad
>>hair day when  he fired up his flame thrower
>>
>>Gary.... this is internet not ham packet radio !
>
>No my boy, this is *usenet*, not internet or packet radio.
>As a fully participating usenet site for many many years,
>I tell you now that netnews articles have a header, and
>that header has a Distribution line. If your lame software
>*hides* that header from you, that's a problem you need
>to address with your software provider and your site manager.
>
>If your lame software hides the header, I'll reproduce the one for
>this message here in the body text so you can see it.
>
>Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateu
r.policy
>Subject: Re: All spammers please read was (Re: WI Hams Please read!
>Summary:
>Expires:
>References: <Pine.SOL.3.91.960129095837.2325A-100000-100000-100000-100000@qni
.com>
>Sender:
>Reply-To: [e-mail] (Gary Coffman)
>Followup-To:
>Distribution:
>Organization: Destructive Testing Systems
>Keywords:
>
>
>Now *that's* what a netnews header looks like. Every article
>generates one. See that line labeled "Distribution:" up there?
>That's your distribution line. If you leave it blank, the default
>is "world", but if you put a local or regional code in there,
>the distribution will be limited to that area.
>
>It matters not one whit whether usenet is carried over internet,
>uucp, packet radio, or two tin cans and a string. The *news*
>software requires that header, and it's on every message.

..unless, of course, you're forwarding Usenet via Morse code....



;-)

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *



From [e-mail] Mon Feb 05 21:19:19 1996
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcom.com!jlowman
From: [e-mail] (Jim Lowman)
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]> <[e-mail]>
Date: Mon, 29 Jan 1996 21:22:30 GMT
Lines: 45
Sender: [e-mail]
Xref: news.epix.net rec.radio.amateur.antenna:18861 rec.radio.amateur.misc:97665 rec.radio.amateur.policy:32971

Gary Coffman ([e-mail]) wrote:

: No my boy, this is *usenet*, not internet or packet radio.
: As a fully participating usenet site for many many years,
: I tell you now that netnews articles have a header, and
: that header has a Distribution line. If your lame software
: *hides* that header from you, that's a problem you need
: to address with your software provider and your site manager.

: If your lame software hides the header, I'll reproduce the one for
: this message here in the body text so you can see it.

[example header snipped]

: Now *that's* what a netnews header looks like. Every article
: generates one. See that line labeled "Distribution:" up there?
: That's your distribution line. If you leave it blank, the default
: is "world", but if you put a local or regional code in there,
: the distribution will be limited to that area.

: It matters not one whit whether usenet is carried over internet,
: uucp, packet radio, or two tin cans and a string. The *news*
: software requires that header, and it's on every message.

Quite correct, Gary.  However, while the distribution line is evident
when I use the tin newsreader on my shell account with Netcom, I do not
recall seeing one on my other Internet account, where I use the Netscape
2.0 beta for reading netnews.  It must be there, though.  I can see where
it might be easily overlooked, and where newcomers to usenet might not be
aware of its presence.

A question, though.  I can limit distribution to CA, but is it even possible
to limit distribution to WI?  Not sure if individual states will work, other
than CA.

The original example shows a case in which distribution to a limited area is
a good idea.  But then, it seems to me that most posts to the ham newsgroups
are rarely regional in nature.  That is the reason that I hate to see posts
where the originator requests an e-mail reply.  In many cases, others can
also benefit from seeing the answer posted "out in the open."

Just my 2 cents worth,

73 de Jim - KF6CR
San Bernardino, CA


From [e-mail] Mon Feb 05 21:19:21 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Stu Ritter)
Newsgroups: rec.radio.amateur.antenna
Subject: Sommer XP beams
Date: 29 Jan 96 21:32:48 GMT
Organization: ucsd usenet gateway
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I recently installed a Sommer XP-406 antenna. It has been in
use for two months and included a go at the ARRL RTTY Roundup.
This is the very short boom (2.4 meters) antenna. I find good front to
side ratio but near no front to back. It is almost like a vertical with
gain in two directions. I am planning to extend the boom to the
next size of 4.4 meters. I would not recommend this antenna unless
you absolutely cannot use anything larger. My last antenna was a
Telex TH-7. I have used the XP-506 while on a visit to Germany at a
friends station in April of 1990. Running 100 Watts from a TS-940
the signal reports from the states on 15-17 and 20 meters were
higher than I expected from a 15 foot boom antenna. Granted the
solar index at the time was quite favorable, the signal reports were
much more than expected.
The SWR on the 406 has been exactly as spec'd by the manufacturer
and the 40 meter dipole came down to 1.3:1 with the antenna mounted
at 65 feet. The materials are first rate and the construction is robust to
say the least. The construction instructions are understandable, but not
equal to the manual from Hy-Gain on the TH-7. There are enough
construction drawings to fascilitate rather painless assembly.
Signal reports on the 406 have been as expected from such a small
boomed antenna.
Stu
N0LEF



From [e-mail] Mon Feb 05 21:19:22 1996
Path: news.epix.net!uunet!in2.uu.net!solaris.cc.vt.edu!newsfeed.internetmci.com!howland.reston.ans.net!usc!news.cerf.net!newsserver.sdsc.edu!acsc.com!kaiwan.kaiwan.com!not-for-mail
From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Testing co-axial filter
Date: 29 Jan 1996 22:06:39 -0800
Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338)
Lines: 39
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <[e-mail]> <4eh1de$[e-mail]>
NNTP-Posting-Host: kaiwan009.kaiwan.com

In article <4eh1de$[e-mail]>, [e-mail] (Tom Bruhns) wrote
:
>
> I'd like to offer a slightly different viewpoint.  I have network analyzers
> available, and yes, they are certainly nice to measure what you have put

[stuff deleted]

> OK, so let's take a quick peek at using transmission lines for filtering...
> Consider a line like foam-RG-8 type with a velocity factor of .8 and
> an attenuation of 2dB/100 feet.  At 2 meters, if I did my math right,
> the unloaded Q of a resonator made from this line would be about 260.  Now
> why would I want to use a 16" piece of this line to make a resonator with
> that Q, when I could just as well wind a coil half an inch in diameter and
> half an inch long and get just as high a Q?  Or, by making a helical
> resonator in a short piece of 1" copper pipe, I can end up with an unloaded
> Q of about 500, and get half the loss as if I used the transmission line.
> And if I want bandwidths on the order of 1.5MHz at 150MHz, I'll need loaded
> Q's of 100 for the simplest filters and quite a bit higher for higher order
> filters.  So the very first step in a _design_ tells me that coaxial cable
> is probably NOT the way to implement the resonators I'll need.
>
>
> --
> Cheers,
> Tom
> [e-mail]

These are really interesting material.  Where can I find more about
this topic?  Is ARRL Handbook a good source?

73,

p.s. Looks like my server did not get all newgroup traffic cause this is
the only article I have seen in this thread.  Did I missed the one
on how to make a million buck?

---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'


From [e-mail] Mon Feb 05 21:19:23 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Testing co-axial filter
Date: 29 Jan 1996 22:16:37 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 46
Distribution: world
Message-ID: <4ejh05$[e-mail]>
References: <4ej80r$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Cecil Moore ([e-mail]) wrote:

: Hi Tom, What's your opinion about shorted ladder-line stubs for HF vs say,
: toroidal inductors?

Well, certainly there's a space issue.  If ladder line fits your mechanical
requirements, then, if you want to consider it as a resonator, you can
easily figure the unloaded Q if you know the loss, say L in dB/100 feet,
and the velocity factor, v.f.  Then

    Qu = 2.77 * f / (v.f. * L)

where
    Qu is the unloaded resonator Q, for a resonator n quarterwaves long,
    where n is a small integer

    f is the frequency in MHz

    v.f. is velocity factor of line

    L is loss in dB/100 ft.

If, for example, you have a line with 0.1dB/100 ft loss at 14MHz and a
velocity factor of .95 and you're going to operate it at 14Mhz, then the
unloaded Q of a quarter wave stub should be around 400.  That's comparable,
at least with what you could do with a toroidal inductor.

Another example:  3-1/8" line at 146MHz should have about .13dB/100ft loss,
and that will yield an unloaded Q of around 3000.  That's why duplexer
cavities tend to be about that size:  it really is a decent Q, as opposed
to the example I gave in my earlier post.

If you are asking about using a stub that's not a quarter wave, to get
some arbitrary impedance, that's a slightly different question than what
the base post was looking for.  Haven't gone through the math, but I'd
suspect that typical lines will give you inductive reactances with Q's
pretty close to the resonant unloaded Q.

Also:  be careful about stubs coupling to your antenna, if you are using
them close by.


--
Cheers,
Tom
[e-mail]


From [e-mail] Mon Feb 05 21:19:24 1996
Path: news.epix.net!uunet!in1.uu.net!gatech!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.eecs.umich.edu!news.eecs.umich.edu!majewski
From: [e-mail] (Ron Majewski)
Newsgroups: rec.radio.amateur.antenna
Subject: Tower Selection Advice Sought
Date: 29 Jan 1996 23:12:35 GMT
Organization: Environmental Research Institute of Michigan, Ann Arbor, Michigan
Lines: 28
Distribution: world
Message-ID: <[e-mail]>
NNTP-Posting-Host: spsd630a.erim.org


Hello-

A friend of mine is thinking about putting up a new tower and
is looking for advice/information about tower options.  His
desire-ments are:

   60-80ft height
   self-supporting to avoid guy wires
   tilt-over or telescoping for easy installation/service
   20 sqft wind load capacity

Is such a combination possible to achieve?

Please share your thoughts and experiences with him.  Please
Email to me and I will forward things to him.

Thanks and 73,

Ron (wb8ruq).
[e-mail]

--

Ron Majewski ([e-mail])

The Environmental Research Institute of Michigan



From [e-mail] Mon Feb 05 21:19:25 1996
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!netaxs.com!mhv.net!usenet
From: Pete Dziomba <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Larson 2M/70Cm "open Coil" whip dimensions...
Date: 30 Jan 1996 00:21:40 GMT
Organization: MHVNet, the Mid Hudson Valley's Internet connection
Lines: 9
Message-ID: <4ejoak$[e-mail]>
NNTP-Posting-Host: ulster-port26.mhv.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Can anyone tell me the actual dimensions of the Larson dual band? This is
the new "Open coil", usally black, style. I smoked something in the one I
had, the old "Plastic incased" style... It works fine on VHF but stinks
on UHF... I replaced the ant., but just wanted to make a replacment whip
for Temp. setups since just the center coil is bad... I need to know the
Distance from the bottom of the whip to the Coil, # of turns of the coil,
Length of the coil, I.D. of the coil, and length above the coil...
Thanks for any info... 73 Pete [e-mail]



From [e-mail] Mon Feb 05 21:19:26 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.ifu.net!ifu
From: [e-mail] (Dean)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GAP  Titan DX
Date: 30 Jan 1996 00:22:34 GMT
Organization: ifu.net
Lines: 16
Message-ID: <4ejocb$[e-mail]>
References: <4efig2$[e-mail]>
NNTP-Posting-Host: ip62.ifu.net
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <4efig2$[e-mail]>,
   [e-mail] (RSmall01) wrote:
>Any comments on the GAP Titan DX Vertical would be very much appreciated!
>
>73
>Dick N1WJP
>EMail [e-mail]

Dick,

It works for me.

73,

Dean  N2TNN



From [e-mail] Mon Feb 05 21:19:27 1996
Path: news.epix.net!uunet!in1.uu.net!news.ios.com!usenet
From: . (Blackshadow)
Newsgroups: uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.scanner,alt.radio.scanner,alt.radio.scanner.uk
Subject: R7100 Modification
Date: 30 Jan 1996 00:56:08 GMT
Organization: IBF
Lines: 57
Message-ID: <4ejqb8$[e-mail]>
NNTP-Posting-Host: 205.147.154.70
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news.epix.net uk.radio.amateur:10540 rec.radio.shortwave:69636 rec.radio.amateur.antenna:18869 rec.radio.amateur.equipment:24526 rec.radio.amateur.misc:97689 rec.radio.scanner:44955 alt.radio.scanner:27174 alt.radio.scanner.uk:2086

Ever since ICOM decided to delete the 800 - 900 MHZ coverage from its IC-R7100

receiver,
older R7100's demand premium prices on the used market. ICOM insisted that the

R7100 was
now made in two versions, one for the general public and another (with 800-900

coverage) for
government and law enforcement agencies. The extended coverage version also se
lls
for $200-$300 more! Per discussions with ICOM there were very clear that this
was
done to comply with
legal requirements that prohibit new scanners from be capable of receiving
cellular telephone
transmissions. My opposition has always been why we should be penalized if we
want
to listen to
local law enforcement agencies within the 800 MHz band. Personally, I have no
interest in
listening to cell phones when a receiver as competent as the R7100 opens up al
most
2 ghz of
spectrum.

I recently noticed that Grove now offers the R7100 with "restored" coverage so
 I
set out to find
out how it was done. Performing the following procedure will allow you to list
en
to local law
enforcement with the 800-900 mHz portion of the spectrum. Remove the screws th
at
hold the top
cover and disconnect the speaker. Next, remove the two flat head screws that h
old
the metal
shield covering the rear of the front panel.. On the rear apron, remove the tw
o
screws that hold
the upper chassis to the lower chassis. Finally, remove the antenna cable that
 is
connected to the
circuit board assembly in the rear right corner of the R7100. Referring to the

owners manual,
CAREFULLY separate the upper half of the receiver, inverting it, setting it be
side
the radio as
illustrated in the owners manual. Be careful not to pull on the cables that
connect the upper
portion to the lower half of the radio. In the front of the owners manual ther
e is
a small paragraph
that explains the various jumper options for the R7100's CI-V interface option
s.
It's on this board
that the modification is done. The board is located behind the "M-SET" switch.
 The
jumpers are
actually circular pads, split vertically. A drop of solder constitutes a jumpe
r -
no solder = no
jumper.

Locate jumper "A6" as illustrated in the owners manual. Above "A6" you'll see
a
small ball of
solder. Using solder wick, CAREFULLY remove the solder, exposing the split
circular pad
beneath. The space between the pads is very small so be sure to remove all the

solder. Reassemble
the radio and you're done!

Blackshadow



From [e-mail] Mon Feb 05 21:19:28 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.qnet.com!news.widomaker.com!uunet!in1.uu.net!everest.iserv.net!usenet
From: Jim Keesler <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Ground Radials...?
Date: 30 Jan 1996 01:28:11 GMT
Organization: WWMT TV
Lines: 26
Message-ID: <4ejs7b$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dialup250.iserv.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Hi Tom--de K8EXF.  Some ground radial thoughts:

1.  You can avoid digging by just laying the wires on the surface while
the grass (weeds?) is/are dead--then when spring arrives, the wires are
covered by the new growth!  Works fine as long as there isn't much
traffic while they're exposed.  If necessary, use some hair 'bobby pins"
or some plastic clips to hold the wires to the surface.

2.  As far as RF is concerned, you are simulating a conductive surface,
and the more conductors the better--up to a point.  AM broadcasters
figure 120 radials is good, but hams have good luck with 16 or 32.  As
you add wires, you need to double the previous number to get a
significant result.  Plan on at least 1/4 wavelength for the lowest band
desired.

3.  In the real world, just lay out what fits--if you want to include 160
meters, try to run each radial to the edge of your 150 X 150 area.

4.  Ground rods at the ends don't make much difference for RF since the
RF can only penetrate a few inches of soil.  However for lightning
protection grounding, bury a few heavy copper wires (bare) and put ground
rods on their ends.  (For RF, the radials can be insulated--you get a big
capacitance to "ground".

Good luck and 73!



From [e-mail] Mon Feb 05 21:19:29 1996
Path: news.epix.net!news.sprintlink.net!mhv.net!netaxs.com!news2.cais.net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!istar.net!news1.toronto.fonorola.net!news1.toronto.istar.net!news.toronto.istar.net!delaney.tap.net!news2.toronto.istar.net!server1.oxford.net!usenet
From: [e-mail] (Gordon Collins)
Newsgroups: rec.radio.amateur.antenna
Subject: Interference with lamps
Date: Tue, 30 Jan 1996 04:30:34 GMT
Organization: North Norwich Telephone
Lines: 9
Message-ID: <4ek79r$[e-mail]>
NNTP-Posting-Host: burgessville-119.oxford.net
X-Newsreader: Forte Free Agent 1.0.82

     We have a lamp on the second floor of our home. It is one ofthose
lights wich is operated by touching it. (trilight). Whenever I tune up
my rig in the basement the lamp starts to turn on and proceed through
all three cycles. It is very annoying.
     My antenna is a centrefed dipole cut for 40M. It is strung
between two treest at approximately the same hight asthe second floor
but about twenty feet away.
     Does anyone have any ideas on how to correct this problem?



From [e-mail] Mon Feb 05 21:19:30 1996
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!fdurt1.fdu.edu!xyzzy.bubble.org!newshost.cyberramp.net!news.onramp.net!news.mind.net!chi-news.cic.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.new-york.net!news.columbia.edu!watsun.cc.columbia.edu!jbaltz
From: [e-mail] (Jerry B Altzman)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.misc,rec.radio.amateur.policy
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Date: 30 Jan 1996 04:39:09 GMT
Organization: double ionizers association
Lines: 19
Message-ID: <4ek7dd$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: watsun.cc.columbia.edu
Xref: news.epix.net rec.radio.amateur.antenna:18760 rec.radio.amateur.misc:97527 rec.radio.amateur.policy:32901

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>Now *that's* what a netnews header looks like. Every article
>generates one. See that line labeled "Distribution:" up there?
>That's your distribution line. If you leave it blank, the default
>is "world", but if you put a local or regional code in there,
>the distribution will be limited to that area.

You hope. That is, if one of your upstream or downstream sites isn't dain
bramaged to the point of ignoring Distribution: lines. (Many were. I can't
remember how many postings we'd get to an old, internal-to-Columbia newgroup
cu.bboard from Colorado University with Distribution: set to denver or co or
something else.)

>Gary

//jbaltz
jerry b. altzman   Entropy just isn't what it used to be      [phone]
[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


From [e-mail] Mon Feb 05 21:19:31 1996
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!primus.ac.net!news.hsonline.net!eddie.cioe.com!cioeserv.cioe.com!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: Listserv@ucsd (Mailing List Processor)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: your LISTSERV request "help calculating transmission power"
Date: 30 Jan 96 06:12:11 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

The mailing list "calculating" could not be found.
You may use the INDEX command to get a listing
of available mailing lists.


From [e-mail] Mon Feb 05 21:19:32 1996
Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!news.u.washington.edu!news.alt.net!news1.alt.net!news.exodus.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: Listserv@ucsd (Mailing List Processor)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: your LISTSERV request "help findind part 95 (2 msgs)"
Date: 30 Jan 96 06:12:15 GMT
Organization: ucsd usenet gateway
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

The mailing list "findind" could not be found.
You may use the INDEX command to get a listing
of available mailing lists.


From [e-mail] Mon Feb 05 21:19:33 1996
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: 82 Repeater in Kansas City
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]>
Date: Tue, 30 Jan 1996 09:24:14 GMT
Lines: 17
Xref: news.epix.net rec.radio.amateur.policy:33008 rec.radio.amateur.antenna:18907 rec.radio.amateur.equipment:24595 rec.radio.amateur.homebrew:13149 rec.radio.amateur.digital.misc:13973

In <[e-mail]> Eddie Caffray <[e-mail]> write
s:

> On the 146.85 repeater here in Central NY we had trouble with one user also.
 He made it that
>no one would even monitor the reapeater anymore. The club voted to ban him an
d we did. The
>reapeater is a great place to be again.

How do you manage to effectively ban malicious users from a repeater?
Of course this problem is known all over the world, but at least over
here we have not yet found an effective way of stopping them.  How do
you do that?

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Mon Feb 05 21:19:34 1996
Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail
From: [e-mail] (Mark Fellhauer)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: 82 Repeater in Kansas City/Repeater Use
Date: 30 Jan 1996 09:26:00 -0700
Organization: Primenet Services for the Internet
Lines: 43
Sender: [e-mail]
Message-ID: <4elgqo$[e-mail]>
References: <4efpb3$[e-mail]> <[e-mail]> <[e-mail]>
X-Posted-By: ip200.phx.primenet.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.policy:32923 rec.radio.amateur.antenna:18785 rec.radio.amateur.equipment:24394 rec.radio.amateur.homebrew:13052 rec.radio.amateur.digital.misc:13884

[e-mail] (Rob Janssen) wrote:

>In <[e-mail]> Eddie Caffray <[e-mail]> writ
es:

>> On the 146.85 repeater here in Central NY we had trouble with one user also
. He made it that
>>no one would even monitor the reapeater anymore. The club voted to ban him a
nd we did. The
>>reapeater is a great place to be again.

>How do you manage to effectively ban malicious users from a repeater?
>Of course this problem is known all over the world, but at least over
>here we have not yet found an effective way of stopping them.  How do
>you do that?

Go to the Arizona Repeater Association's Home Page to see how this is
done.  It involves actively pursuing people who engage in such
activity.  The ARA, as a matter of routine, has an interference
committee dedicated to tracking these people down.

Despite reports to the contrary, the FCC does frown on this activity,
and will enforce sanctions.  Just ask the people here in Phoenix about
that.  An NAL, Notice of Apparant Liability, carries a stiff monetary
fine, about $20,000 (US) worth and forfeiture of ALL broadcasting
equipment and license(s).

It has been reported to me, by Dan Ford, Commander of the SHERRIF'S
Ham Radio Posse, that they also plan to actively engage in pursuing
people misusing radio gear in Maricopa County.  I strongly suggest
that if you plan on jamming a repeater in Central Arizona, plan on
getting caught.

Unfortunately, the ARA has had, for the 3rd time its existence, had to
remove a member, by board action, for misconduct involving repeaters.
This "gentleman" is also facing stiff legal sanctions from the FCC.

In 1995, the 3 biggest abusers of ARA repeaters WERE caught, and
several others have been identified.

73,

Mark Fellhauer
KC7BXS




From [e-mail] Mon Feb 05 21:19:36 1996
Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!mr.net!chi-news.cic.net!nntp.coast.net!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Yagi design and tuning ?'s
Date: 30 Jan 1996 10:09:01 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 42
Message-ID: <4ekqnt$[e-mail]>
References: <4ehe6i$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

> I just built a Yagi using the design software packaged with the
>latest antenna handbook. Question is this: I design it for a center
>frequency of 146 but when I tune it I get a perfect match at 144 MHz.
>I built a T-match with a 4:1 coaxial balun. (6-ele).

There are two possible reasons:

1) The software is not accurate (It happens!), May be someone has compared
   with NEC-2 based programs?

2) You did not adhere to some dimensions, like boom and element diameter,
   method of element mounting.

In any case shortening the driven element will not help, even if you get
a reasonable match, the gain and pattern will be nowhere near what it is
supposed to be, in other words your antenna performes like a much smaller one
which has been properly designed.

One criterium for a proper antenna simmulation is, that when you design
the feed point impedance to be 50 Ohms it comes out 50 Ohms without further
adjustments.

73, Moritz DL5UH



I started
>shortening the driven element but the perfect match seemed to
>still occur around 144. Before I shorten the DE more, what is the
>correlation between the surrounding element lengths as far as
>tuning freq. is concerned? Should I just keep shortening the DE
>and a assume the design software is correct for the other element
>lengths or will shortening the DE not produce the desired effect.
>Do I need to shorten all the elements to produce a good match at a
>slightly higher frequency? (Non-conducting boom, 3/8" dia alum. ele)
>
>Welcome any hints and insights,
>
>Thanks alot, John Lumkes AA9QP  [e-mail]
>




From [e-mail] Mon Feb 05 21:19:36 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!uunet!in2.uu.net!EU.net!sun4nl!baan.nl!jmaas
From: [e-mail] (Johan Maas)
Subject: Strange Dipole
Sender: [e-mail]
Message-ID: <[e-mail]>
Date: Tue, 30 Jan 1996 13:41:57 GMT
X-Nntp-Posting-Host: daly.baan.nl
Organization: Baan International b.v.
Keywords: Dipole
Lines: 27

Hello Antenna people,

I have made a short dipole.

I made on the end of each leg a "coil" like:

    -------- feedpoint ----------------
                                -------
                                -------
                                -------
this describes only one end. The wire is winded on a pvc tube! this is done in
 the length
direction of the tube; so the forward and backward wire are in the opposite di
rection. This
means that iam actual not making a coil.
The length of the tube is 20cm!

It was surprising me that i saw that the dipole not wordked on the frequencie
i had planned the
dipole but on the double frequencie.

So i did some tests and the dipole had a total length of one wave. The impedan
ce was guite good
the swr was good.

I work for the first time on 15m ! The total length of the dipole is 4 meter.
It works great.

I hope to see some nice answers, how this antenna works and how the radiate di
agram look like?

73 from PA3GSB the Johan.


From [e-mail] Mon Feb 05 21:19:37 1996
Path: news.epix.net!news.sprintlink.net!castle.nando.net!imci4!newsfeed.internetmci.com!gatech!newsjunkie.ans.net!news.ptd.net!news
From: [e-mail] (George)
Newsgroups: rec.radio.amateur.antenna
Subject: HELP-Interference
Date: 30 Jan 1996 14:22:15 GMT
Organization: ProLog - PenTeleData, Inc.
Lines: 12
Message-ID: <4el9in$[e-mail]>
NNTP-Posting-Host: cs1-04.eph.ptd.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

I'm trying to use my AEAfax to receive FAX/RTTY.  But My computer
generates too much interfercne.  I know its not the
monitor,mouse,keyboard,&modem.  I've removed all and powered up CPU and
still get noise.  I've taken CPU to another room (on another electrical
circuit) and still get a +20dB noise level from CPU.  Now I'm on the
second story of a townhouse and my radios are only grounded to the
electrical system ground.  I'm thinking of running a ground wire from
second floor window and driving a rod in the ground. Will this help?  I
know nothing about grounding.
Tnx
George



From [e-mail] Mon Feb 05 21:19:38 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!cyberspace.com!news.uoregon.edu!news.orst.edu!engr.orst.edu!reuter.cse.ogi.edu!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!news.av.qnet.com!ibbs!js
From: [e-mail] (Jeff Stillinger)
Subject: Re: ~~~? What is the best coax cable for CB's?~~~~
X-Newsreader: TIN [version 1.2 PL2]
Organization: Coffee Radio Difference Committee
Message-ID: <[e-mail]>
References: <4dpris$[e-mail]> <4dr03e$[e-mail]> <[e-mail]> <[e-mail]> <4ebt3g$[e-mail]>
Date: Tue, 30 Jan 1996 14:30:49 GMT
Lines: 15

Vince Fiscus,  KB7ADL ([e-mail]) wrote:

: Best Coax for CB is one that ends in a dummy load.


It is VERY important that when using CB radio to mount your coax in a
strait line, placing a nail though the coax every 3 feet.  Roofing nails
work best.  This will keep the cable from flopping about in the wind.

--
-----------------------------------------------------------------------------
Jeff Stillinger - KB6IBB                              [e-mail]
PSC Box 3429                                          [e-mail]
Edwards AFB, CA  93524                                [phone]N1
-----------------------------------------------------------------------------


From [e-mail] Mon Feb 05 21:19:40 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 30 Jan 1996 14:39:30 GMT
Organization: Continental Cablevision
Lines: 33
Message-ID: <4elaj2$[e-mail]>
References: <4ecj8s$[e-mail]> <4edc05$[e-mail]>
NNTP-Posting-Host: 169.152.167.70
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

>I've had that problem on both 160 and 80 also. 1/2 wl verticals stink.

Tom:

I would think that a 1/2 al vertical would be tough to beat for the
really long-haul DX on 160.  I had always envisioned my dream antenna for
160 as a 190-degree Pi-Rod tower, guyed with Phillystran, and mounted on
a three-foot concrete base pier with a Blaw-Knox glass base insulator.
Of course, the foundation for the 190 degree radiator found its
beginnings with Ballantine's 5/8 wl radiator in 1923, but I believe it
was Brown, Lewis, et. al., who then optimzed the length to 190 degrees in
an effort to maximize ground-wave radiation (through the ubiquitous
multi-wire ground system) and minimize skywave radiation with the 190
degree radiator.  The problem as I see it, we as amateurs rarely have a
need to maximize ground wave radiation.  A byproduct of this however, is
that an extremely low launch angle can be taken advantage of for the
mega-long DX.

Back to reality: There was an interesting article in the August, 1994
issue of QST, entitled "The 160-Meter Sloper System at K3LR" -pp. 36-38.
This antenna system takes on the characteristics of a 1/2 wl radiator,
but has several advantages.  First, the antenna is arranged as a
perpendicular inverted "V" against a tall tower; 190 feet in this case.
Multiple Vees are then arranged against the tower to provide for a
limited amount of directivity.  Secondly, the lower portion of the Vee
can be moved away from the tower (perhaps on a pulley system) in order to
vary the launch angle of the antenna.

My dream antenna may now be leaning in this direction, but I still need
that blasted 200 foot tower!

-Paul, N9AZ



From [e-mail] Mon Feb 05 21:19:41 1996
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From: [e-mail] (Bayard Coolidge USG ZKO3-3/S20)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Feed Line - Ethernet Coax
Date: 30 Jan 1996 16:07:20 GMT
Organization: Digital Equipment Corporation
Lines: 35
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--

I have the specs for Ethernet coax at home (in hard copy), and I'll
try to remember to bring them in tomorrow and re-post them. Although
I was on the original design team, I don't have our measurements, but
someone else's.

In talking to some local hams here with backgrounds similar to mine
in networking (i.e., they too have a bunch of Ethernet coax in the
basement :-), it seems that it "falls apart" at UHF. That is, the
spec sheet I have implies as Cecil, KB7BK, states that the losses are
about the same as foamed RG-8/U type (or about the same as RG14A or
RG217) on paper, but the numbers about 200 MHz or so may have to be
taken with a grain of salt. I haven't tried it myself as yet, as I
don't have the proper measurement equipment needed to do the job.

An earlier post mumbled about it being poorly shielded. I find that
extremely hard to believe given that the shield is foil-braid-foil-braid
(inside -> outside), making it on a par with CATV hardline. For those
not familiar with it, the center conductor is about 11.5 AWG solid wire.
And yes, it was designed by a ham (not me), so the overall size and
construction was somewhat deliberately made to imitate "RG8/U". And yes,
it should be left indoors or in a pipe, and not buried or left exposed
to the weather. Oh, by the way, the yellow PVC variety is essentially
the same thing, as is the bluish-purple DEC CI cable (but with TNC's).

------------------------------------------------------------------------------
Bayard R. Coolidge      N1HO    DISCLAIMER: The opinions expressed are
Digital Equipment Corp.         solely those of the author, and not
Nashua, New Hampshire, USA      those of Digital Equipment Corporation
[e-mail]            nor any other entity.
    "Brake for Moose - It can save your life" - N.H. Fish & Game Dept.
------------------------------------------------------------------------------


From [e-mail] Mon Feb 05 21:19:43 1996
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From: Bill Funk <[e-mail]>
Newsgroups: uk.radio.amateur,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.scanner,alt.radio.scanner,alt.radio.scanner.uk
Subject: Re: R7100 Modification
Date: 30 Jan 1996 19:11:30 GMT
Organization: Star Link Internet Services
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Xref: news.epix.net uk.radio.amateur:10553 rec.radio.shortwave:69651 rec.radio.amateur.antenna:18879 rec.radio.amateur.equipment:24540 rec.radio.amateur.misc:97702 rec.radio.scanner:44980 alt.radio.scanner:27187 alt.radio.scanner.uk:2089


>>
>>Locate jumper "A6" as illustrated in the owners manual. Above "A6" you'll se
e a
>>small ball of
>>solder. Using solder wick, CAREFULLY remove the solder, exposing the split
>>circular pad
>>beneath. The space between the pads is very small so be sure to remove all t
he
>>solder. Reassemble
>>the radio and you're done!
>>
>>Blackshadow
>>
>
>   Many thanks my friend who ever you are.  I am curious to know who "Grove"
is that
>you mention.  Could you comment on this?  I am in the Two-way radio service b
usiness
>and have need of this blocked range of frequencies to monitor for interferenc
e . I
>thought for a while I was going to have to resort to a R9000 which is awfully

>expensive.  Again many thanks.  I would like to hear from you here or on my E
-Mail
>[e-mail]=>
=====================================================================

Hmmm... If you can buy a new R9000 (since you are in a business that will
allow you to do so), then you can get an un-restricted R-7100.

Me, I'm lucky. I have an older R-7100, full coverage! (No, it's *not* for
sale!!) :-)

Bill Funk



From [e-mail] Mon Feb 05 21:19:44 1996
Newsgroups: rec.radio.amateur.antenna
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From: [e-mail] (Robert Casey)
Subject: Re: Interference with lamps
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
References: <4ek79r$[e-mail]> <[e-mail]>
Date: Tue, 30 Jan 1996 22:47:10 GMT
Lines: 21
Sender: [e-mail]

In article <[e-mail]> [e-mail] (T
ed Kell) writes:
>
>Take a sledgehammer to the lamp.  :)
>
>72
Usually these touch lamps generate gobs of RFI interference, so getting
rid of it would be a sensible thing to do.
>
>In article <4ek79r$[e-mail]>, [e-mail] (Gordon
>Collins) wrote:
>
>>      We have a lamp on the second floor of our home. It is one ofthose
>> lights wich is operated by touching it. (trilight). Whenever I tune up
>> my rig in the basement the lamp starts to turn on and proceed through
>> all three cycles. It is very annoying.
>>      My antenna is a centrefed dipole cut for 40M. It is strung
>> between two treest at approximately the same hight asthe second floor
>> but about twenty feet away.
>>      Does anyone have any ideas on how to correct this problem?




From [e-mail] Mon Feb 05 21:19:45 1996
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From: fstengel <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: VHF/UHF disguise antenna for Mobile use
Date: 31 Jan 1996 01:42:27 GMT
Organization: LocalNet Corporation
Lines: 11
Message-ID: <4emhe3$[e-mail]>
References: <[e-mail]> <4e85ua$[e-mail]>
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Good evening
I read with intrest your questions about DISGUISED ANTENNAS.   If you
would like to discuss this topic call me between 8:00 and 5:00, Monday
thru Friday. Just ask to speak with Fran.  To wet your intrest note my
address. 73 BCNU

Fran Stengel Jr.K2GUG
Sti-Co Ind. Inc.
11 Cobham Dr. Orchard Park N.Y. 14127
716 662 2680



From [e-mail] Mon Feb 05 21:19:46 1996
Newsgroups: rec.radio.amateur.antenna
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From: Paul Reedy <[e-mail]>
Subject: Re: Transformer for Screwdriver type antenna
Sender: [e-mail] (news)
Organization: n5xcr.ampr.org
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X-Nntp-Posting-Host: 192.168.18.12
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Hank Blackstock <[e-mail]> writes:
> [e-mail] (Garry Foster) wrote:
> >I hear that Don Johnson and others are now recomending a matchinng
> >transformer at the base of this antenna instead of the matching
> >capicators.
>
> I can't imagine what the advantage would be. capacitors, are
> cheap, simple and effective. I have used them for years on my
> screwdriver antenna. (my own design with 3.5 inch coil).
> someone please enlighten me as to the advantage.
>
> 73 Hank
>
>
Apparantly, with the transformer, you don't need the relays to switch
in and out, reducing complexity, However I don't know how effective
this really is.  I would like to have the information on this transformer,
as a friend of mine tried making a screwdriver ant. and went back to
his Hustler after not being able to get his SWR down.  Please let me know
where I can get the specs on this transformer design, so I can forward it
to him.


From [e-mail] Mon Feb 05 21:19:47 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Solid dielectric coax
Date: 31 Jan 1996 04:14:56 GMT
Organization: Arizona State University
Lines: 19
Message-ID: <4emqc0$[e-mail]>
References: <4ebjb8$[e-mail]> <4elo8i$[e-mail]>
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Roy Lewallen ([e-mail]) wrote:
: To get the same specs as 9913 but with solid dielectric insulation,
: you need either larger diameter cable or very creative specsmanship. Hopeful
ly
: the coax manuafacturers won't discover what the antenna manufacturers have
: about how to sell goods to amateurs.

Actually, I suspect they already have discovered this since I have seen
various Belden clones with "less loss than Belden" of one or two tenths
dB per 100 feet. I asked here last spring if anyone knew what the
tolerances are for the loss figures that coax manufacturers give. I
speculated that since they are quoted to a tenth of a dB per 100 feet
that that is the sort of tolerance expected. Nobody who knew answered.
A couple of measurements of mine on clone brand coaxes give loss values
that are well outside and above (0.5 to 1 dB) the values given in the
specifications. It could be that my measurements are in error.  I hope
so. At least accurate coax loss measurements are a lot easier than
accurate antenna gain measurements.

Kevin [e-mail]


From [e-mail] Mon Feb 05 21:19:48 1996
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From: [e-mail] (KB9VU)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: GAP  Titan DX
Date: 31 Jan 1996 07:06:59 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Dick,

It works for me also.  I've checked mine against a dipole at 35' and a
longwire (160' X 30' up at is's highest point) and there are both plus and
minus differences.  NONE of them shows the GAP worse by more than 1 S
unit.  75 meter performance is 1 to 2 S units better than the dipole!  40
meter performance is equal to or better than the dipole and slightly worse
than the longwire depending on wether working phone or CW.  The GAP is
better in the Phone end.  20 meters is slightly worse than both the other
antennas with the dipole working the best.  15 meters is better than the
long wire and equal to the dipole.  10 meters is worse than both the
dipole and the longwire (less than 1 S unit though).  On 17 meters, both
the dipole and the long wire are better.  On 12 meters, the long wire is
better, the GAP and dipole are equal.

From my observations and those of others in the area, folks either like
them or they don't.  There is a mind set in the Ham community that ALL
verticals are really tall dummy loads.  I have not found that to be the
case.  Mine works fine in my installation which is a compromise due to
space and zoning restrictions.  My antenna is ground mounted with the 40
meter counterpoise only 10 to 12" off the grass.

Mike, KB9VU


From [e-mail] Mon Feb 05 21:19:49 1996
Path: news.epix.net!news.sprintlink.net!news.ais.net!vixen.cso.uiuc.edu!usenet
From: "C. J. Hawley" <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Transformer for Screwdriver type antenna
Date: Wed, 31 Jan 1996 10:05:55 -0600
Organization: University of Illinois at Urbana
Lines: 71
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Paul Reedy wrote:
>
> Hank Blackstock <[e-mail]> writes:
> > [e-mail] (Garry Foster) wrote:
> > >I hear that Don Johnson and others are now recomending a matchinng
> > >transformer at the base of this antenna instead of the matching
> > >capicators.
> >
> > I can't imagine what the advantage would be. capacitors, are
> > cheap, simple and effective. I have used them for years on my
> > screwdriver antenna. (my own design with 3.5 inch coil).
> > someone please enlighten me as to the advantage.
> >
> > 73 Hank
> >
> >
> Apparantly, with the transformer, you don't need the relays to switch
> in and out, reducing complexity, However I don't know how effective
> this really is.  I would like to have the information on this transformer,
> as a friend of mine tried making a screwdriver ant. and went back to
> his Hustler after not being able to get his SWR down.  Please let me know
> where I can get the specs on this transformer design, so I can forward it
> to him.

The Sierra screwdriver antenna uses a small (I think ferrite) toroid with
about 28 turns on it (wound around twice...that is 14 turns to go around and
then another 14 to go around again). They feed the antenna at the center tap
of the toroid winding (at the point between the two 14 turn windings). This
point is at the 12.5 ohm impedance. I use a T225A-2 toroid wound this same
way for the match adjust on my bugcatcher style mobile antenna. I have about
10 taps on mine from a couple up from the center tap and the rest down. I
select the taps with relays but probably could maybe pick one tap as a
compromise for several bands. I have a motor driven cap in series with the
antenna from the tap to adjust to resonance. I find that multiple taps are
necessary when the efficiency of the antenna is improved on the low bands. As
the losses are eliminated, then the impedance of the short antenna say on
160M begins to get down to a few ohms (if you're lucky). The antenna rad
resistance of the short antenna on 160M is well below an ohm, the rest of the
ohms being due to losses. This should give you a clue as to the efficiency of
the commercial screwdriver antenna on the low bands if only one tap is
necessary for a match. Some of my friends have gone to the parallel cap for
the match in an attempt to improve the efficiency of the method of the match
adjust over the tapped toroid, but I haven't found my tproid to be too much
of a detriment. I don't place the highest in the mobil shootouts (and don't
care), but one setup that does also uses the toroid. My tuner setup is in the
trunk with a very short wire to the antenna. It's important to keep this lead
short with minimum capacity to ground (no coax here). Also, note that the
voltage can get high here on the lowest band if the antenna is far from
resonance and the series cap adjusted to a low capacitance value. It's best
to keep the antenna close to resonance and the series capacity near the
maximum value (mine is a 1000 pf vacuum var.). Of course with the screwdriver
this point is meaningless since the antenna is adjusted to resonance by
changing the value of the center loading coil and there is no series
capacitor. I don't mean to confuse you here by switching back and forth
between the screwdriver antenna and the bugcatcher but the laws of physics
are the same for both and understanding one style well implies understanding
both well. With the screwdriver, resonance is adjusted by the center loading
coil. With the bugcatcher, one way resonance is adjusted is by using a center
loading coil that gives resonance just down the band from where you want to
be and using a series cap to bring the resonance up to where you want it. The
match method can be the same for both.
--


Charles Jack Hawley Jr.
Amateur Radio KE9UW (A.K.A. 'Chuck' in Ham Radio)
BMW K100RS, BMWMOA #224 (A.K.A. 'Jack' in Motorcycles)
[e-mail]
Sr. Research Engineer Emeritus
Univ of Ill, Urbana-Champaign



From [e-mail] Mon Feb 05 21:19:51 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: EWE Antenna
Date: 31 Jan 1996 10:32:54 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 29
Sender: [e-mail]
Message-ID: <4eo236$[e-mail]>
References: <4elpgt$[e-mail]>
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In article <4elpgt$[e-mail]>, [e-mail]
(dick sander) writes:

>
>Has anyone built and tested the EWE 160m receiving
>antenna described in an article by WA2WVL in Feb '95 QST?
>
>How well does it work?
>
>Are there any sources for the 3:1 transformer (kits)
>and any suggestions on a preamp?
>
>73, Dick - K5QY

Hi Dick, I did a survey on Topband net with users.

Responses 11. Good or OK 4, poor or no good 7.

Most comments indicate the EWE was better than a tx antenna, unless the tx
antenna was directional or in a rural location. Even short Beverages
always
seemed to beat the EWE. F/B results ranged from poor to good, but there
was
no way to tell the reason for this from the responses. I suspect proximity
to
other antennas, soil conditions, or failure to de-couple the feedline from
the antenna was the cause.

73 Tom


From [e-mail] Mon Feb 05 21:19:51 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!swidir.switch.ch!epflnews!dinews.epfl.ch!usenet
From: Jean-Yves Perrier <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Patch antenna
Date: 31 Jan 1996 11:04:11 +0100
Organization: Ecole Polytechnique Federale de Lausanne
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Hello,

I've heard about a "patch antenna". I don't know what it look like,
neither where it is used (!).

Does somebody know something about it, or can point some references to
me ?

Thanx in advance.

--
Jean-Yves Perrier




From [e-mail] Mon Feb 05 21:19:52 1996
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From: [e-mail] (WA8MSF)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Solid dielectric coax
Date: 31 Jan 1996 11:42:23 -0500
Organization: America Online, Inc. (1-800-827-6364)
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I think you might be interested in Belden 9914 or Times LMR-400

Mike
[e-mail]


From [e-mail] Mon Feb 05 21:19:53 1996
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From: [e-mail] (FORREST GEHRKE)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 M
Message-ID: <[e-mail]>
Date: Wed, 31 Jan 96 11:52:00 -0300
Distribution: world
Organization: Central Core BBS, 201-575-8991
Reply-To: [e-mail] (FORREST GEHRKE)
References: <4eh0ck$[e-mail]>
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WW> Mike, there are two stations here on the east coast that may be able
WW> offer you some help.  Bruce, K01F, has a 4square on 80 meters with
WW> halfwave elements.  At least he started with half waved, however, af
WW> while he concluded that his elevation level was (would you believe)
WW> low.  I don't think he is using the array on 160, but I'm sure he ha
WW> some playing around with it.

I have been told that Bruce has changed his 4Square to 3/8 wavelength
height.  I don't know how he is driving this array.  Since the
elements are longer than 1/4 w.l. measuring mutual impedance
requires sectioning as open circuiting them at their base does
not take them out of action.  Perhaps they might be detuned
sufficiently to make mutual measurements.  Maybe Tom W8JI can
answer that question.  I'm doubtful about detuning them.

 * RM 1.3 02583 * 90% of PC problems are between the keyboard & the chair.


From [e-mail] Mon Feb 05 21:19:54 1996
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From: [e-mail] (FORREST GEHRKE)
Newsgroups: rec.radio.amateur.antenna
Subject: WANTED :  GREAT 80 M
Message-ID: <[e-mail]>
Date: Wed, 31 Jan 96 11:55:00 -0300
Distribution: world
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Reply-To: [e-mail] (FORREST GEHRKE)
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MM> Whole array is fed with DX Engineering phase box a-la Collins style.

MM> Tune each tower to exactly the same format with an MFJ combo SWR
MM> and impedance bridge.  They all are perfect matches size wise tower
MM> tower.  Hook up the phase delay lines,  hook up the line to the shac

This array requires equal current to each element.  If you
measured it, I'd be very interested in what you see for range
of current at each element as you switch the array thru its
four directions.

 * RM 1.3 02583 * I'm having a deja vu experience, just like last time


From [e-mail] Mon Feb 05 21:19:55 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Transformer for Screwdriver type antenna
Date: 31 Jan 1996 12:25:45 -0500
Organization: America Online, Inc. (1-800-827-6364)
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>Apparantly, with the transformer, you don't need the relays to switch
>in and out, reducing complexity, However I don't know how effective
>this really is.  I would like to have the information on this
transformer,
>as a friend of mine tried making a screwdriver ant. and went back to
>his Hustler after not being able to get his SWR down.  Please let me know
>where I can get the specs on this transformer design, so I can forward it
>to him.
>

Why not use a shunt inductor at the bottom? At least it "moves" in the
correct direction automatically as frequency is increased. Since the base
impedance rises as frequency is increased, and inductive reatance also
increases, it tends to track. I use the same coil on 160 through 40!

A shunt capacitor moves the wrong way. As the base impedance rises with
frequency, the capacitive reactance decreases....exactly the opposite of
what we want!

A transformer stays fixed as frequency changes, and needs moved to other
taps as the band changes. Transformers also generally have more loss than
a simple lumped shunt component. Where is the advantage? It costs more and
is more complex, and still requires adjustment with low loss antennas.

73 Tom


From [e-mail] Mon Feb 05 21:19:56 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in2.uu.net!ncrgw2.ncr.com!ncrhub2!ncrcae!news
From: Tom Skelton <[e-mail]>
Subject: Re: Interference with lamps
Message-ID: <[e-mail]>
Sender: [e-mail] (news)
Reply-To: [e-mail] (skeltt)
Organization: NCR
X-Newsreader: DiscussIT 2.5.1.3 for MS Windows [AT&T Software Products Division]
References: <[e-mail]>
Date: Wed, 31 Jan 1996 14:06:58 GMT
Lines: 46


>==========Robert Casey, 1/30/96==========
>
>In article <[e-mail]>
>[e-mail] (Ted Kell) writes:
>>
>>Take a sledgehammer to the lamp.  :)
>>
>>72
>Usually these touch lamps generate gobs of RFI interference, so getting
>rid of it would be a sensible thing to do.
>>
>>In article <4ek79r$[e-mail]>, [e-mail] (Gordon
>>Collins) wrote:
>>
>>>      We have a lamp on the second floor of our home. It is
one ofthose
>>> lights wich is operated by touching it. (trilight). Whenever
I tune up
>>> my rig in the basement the lamp starts to turn on and proceed through
>>> all three cycles. It is very annoying.
>>>      My antenna is a centrefed dipole cut for 40M. It is strung
>>> between two treest at approximately the same hight asthe second floor
>>> but about twenty feet away.
>>>      Does anyone have any ideas on how to correct this problem?
>
>

As W4MPY also noted in the Carolina DX Association's "Pileup"
member newsletter (there, got that shameless plug in... ;-) )
they really are terribly susceptible to RFI.  In
Wayne's case, his 40 meter transmissions were causing 2 of the
lamps in his bedroom
to cycle through the low-med-bright levels while his wife was
sleeping.  She came
running into the radio room, and once he got her to calm down
she indicated it looked
like a SWAT team was outside!

IMHO, touch-activated lamps and amateur radio are mutually exclusive.

73, tom WB4iUX
[e-mail]

31 days and still missing Calvin & Hobbs.....



From [e-mail] Mon Feb 05 21:19:58 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!in-news.erinet.com!uunet!in2.uu.net!news.spss.com!uchinews!ncar!gatech!newsfeed.internetmci.com!howland.reston.ans.net!news.moneng.mei.com!news.sol.net!news.inc.net!news
From: rvanzant <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: All spammers please read was (Re: WI Hams Please read!
Date: 31 Jan 1996 14:43:36 GMT
Organization: van.inc.net
Lines: 14
Message-ID: <4env6o$[e-mail]>
References: <4ecli3$[e-mail]> <[e-mail]>
NNTP-Posting-Host: van.inc.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12 (X11; I; Linux 1.3.59 i486)
X-URL: news:[e-mail]

> Please everyone, use the Distribution attribute properly for
>locale specific postings. If you don't know how, ask your provider.
>If he tells you his system won't permit it, demand he fix his system.
>Every usenet message has a Distribution attribute in the header, and
>every system has to have a way to set it to some value.

    There are a variety of ways to get on the net these days, and various
newsreaders too numerous to mention.  Of course they all *should* offer
the Distribution option you mention, but not all do.  As far as I know,
Netscape 1.1 (the one I use) doesn't.  Correct me if I'm wrong.  Newer
versions may, but I prefer the L&F of 1.1.

rvz  N9ORG



From [e-mail] Mon Feb 05 21:19:59 1996
Path: news.epix.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 31 Jan 1996 15:26:19 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 32
Sender: [e-mail]
Message-ID: <4eoj9b$[e-mail]>
References: <4eo6hs$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4eo6hs$[e-mail]>, [e-mail] writes:

>I think that the vertical's radiation pattern will show one that it has a
>much
>broader total range of vertical angle coverage that that dipole did.
Quite
>probably, the dipole was just better optimized at the SPECIFIC range of
>vertical takeoff and arrival angles that were required for the path.
>
>It would be interesting to know what comparative results were off the
>ends of the dipole and for very long paths, if you can recall or have
them
>noted.
>
>As thorough as you are, I'll bet that is in your notes as well.
>
>

Well I never found that out. The dipole was broadside due E and W, and
there is virtually no propagation on 160 over the north magnetic pole! As
for south, we worked anything we heard, but not much was on in 1973. VP8KF
reported the vertical at 599, and the dipole was 589. PY1DVG said they
were about equal.

I'll take that penalty for the extra consistant two S units we kept
getting into EU, Asia, and VK/ZL.....and the fact the local noises were
barely audible at S1.

Now if I could just phase two dipoles......and add some slewing.
;-)

73 Tom



From [e-mail] Mon Feb 05 21:20:00 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.cybercomm.net!raven.cybercomm.net!richg
From: [e-mail] (Rich Griffiths)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Grounding?
Date: 31 Jan 1996 15:29:30 GMT
Organization: CyberComm Online Services
Lines: 22
Message-ID: <4eo1sr$[e-mail]>
References: <4emote$[e-mail]>
NNTP-Posting-Host: raven.cybercomm.net
X-Newsreader: TIN [version 1.2 PL2]

George ([e-mail]) wrote:
: I have a townhouse and my radio equipment on the second floor.  I'm
: thinking of running a ground wire down the outside of the house (going
: through the window right next to my radios) and driving a rod into the
: ground.  Question 1)  will this help get rid of noise on my ICOM R71A
: caused by my computer? 2) what gauge wire should I use? & 3) what
: length of ground rod should I use to see some results?
: Thanx from a very RF Noisy Shack (maybe someday I'll see the WX Fax!)
: George.

Unfortunately, George, it almost certainly will not work.  If you don't
already have a decent DC ground, you might run that wire anyway, but it's
not likely to solve RFI from a computer.  Computers that were not
constructed to avoid RFI (many of the inexpensive IBM clones, and others)
generally cannot be "fixed" using any practical measures.  You could get
lucky, but usually the only sure fix is to get a different computer.

============================================================
Rich Griffiths                     [e-mail]
Red Bank, New Jersey               W2RG
Monmouth County  FN20wi



From [e-mail] Mon Feb 05 21:20:01 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!spool.mu.edu!daily-planet.execpc.com!homer.alpha.net!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom19!faunt
From: [e-mail] (Doug Faunt N6TQS [phone])
Subject: Re: Transformer for Screwdriver type antenna
In-Reply-To: Paul Reedy's message of Wed, 31 Jan 1996 01:51:16 GMT
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: at home, in Oakland
References: <[e-mail]>
Date: Wed, 31 Jan 1996 16:09:43 GMT
Lines: 19

   Newsgroups: rec.radio.amateur.antenna
   From: Paul Reedy <[e-mail]>
   Date: Wed, 31 Jan 1996 01:51:16 GMT

   Apparantly, with the transformer, you don't need the relays to switch
   in and out, reducing complexity, However I don't know how effective
   this really is.  I would like to have the information on this transformer,
   as a friend of mine tried making a screwdriver ant. and went back to
   his Hustler after not being able to get his SWR down.  Please let me know
   where I can get the specs on this transformer design, so I can forward it
   to him.

Check with Don, W6AAQ, Box 595, Esparto CA 95627.

His document package says it's a unun of 14 bifilar turns (I think)
#18 wound on a T106-2 core, tapped at 11 turns from the input.
The "I think" is because I can't quite read my copy.
73, doug



From [e-mail] Mon Feb 05 21:20:02 1996
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!sol.ctr.columbia.edu!news.oberlin.edu!ocvaxa.cc.oberlin.edu!PRUTH
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: One day of sky-high SWR in a dual-band vertical
Date: 31 Jan 1996 16:15:03 GMT
Organization: Oberlin College, Oberlin, Ohio
Lines: 11
Message-ID: <4eo4i7$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: alpha.cc.oberlin.edu

Two days ago during a very windy day the SWR of the Valor Pro-Am 555
3-section 16.5' vertical shot up to 5:1.  This SWR persisted into
the night.  The next morning it returned to normal.  It has never done
this before, even on windier days.  The coax is fairly new 9913-
equivalent, tightly connected to S0-239, wrapped with electrical tape
and protected with metal sleeve at the base of the antenna.  Could
moisture be getting inside the radome from these temperature extremes
we're having lately in northern Ohio?  Anyone have this happen to
their vertical?  Any way to prevent it from recurring?  Thanks for
your advice/warning/reassurance.  --Bill KB8USZ
[e-mail]


From [e-mail] Mon Feb 05 21:20:03 1996
Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!sol.ctr.columbia.edu!news.oberlin.edu!ocvaxa.cc.oberlin.edu!PRUTH
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Safe distance between dipole feedpoint and metal mast?
Date: 31 Jan 1996 16:25:25 GMT
Organization: Oberlin College, Oberlin, Ohio
Lines: 8
Message-ID: <4eo55l$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: alpha.cc.oberlin.edu

I have the apex of a coax-fed inverted v hanging from the top of
a 20-foot metal mast, and the feedpoint is about 5-6" away from
the mast.  I've read that it's necessary to keep ladder line
away from metal, but I haven't found any information regarding how
close the feedpoint of a dipole can get to metal without
affecting the performance of the dipole.  Should I move it
further away from the mast?  If so, how far?  Thanks again!
--Bill KB8USZ  [e-mail]


From [e-mail] Mon Feb 05 21:20:04 1996
Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in1.uu.net!newsxfer2.itd.umich.edu!agate!howland.reston.ans.net!newsfeed.internetmci.com!nwgw.infi.net!news.infi.net!usenet
From: [e-mail] (Barry Hinkle)
Newsgroups: rec.radio.amateur.antenna
Subject: 440 Horizontal Mobile Ant?
Date: 31 Jan 1996 16:31:50 GMT
Organization: Customer of InfiNet
Lines: 8
Message-ID: <4eo5hm$[e-mail]>
NNTP-Posting-Host: h-addle.ekx.infi.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.3

Does anyone know where I can get a 440 horizontal mobile antenna? Our ATV
repeater is horizontal so I need an omni 440 horizontally polarized
mobile antenna for mobile atv.

TNX & 73

Barry - KT4DQ



From [e-mail] Mon Feb 05 21:20:05 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: WANTED :  GREAT 80 METER DX ANTENNA
Date: 31 Jan 1996 16:49:00 GMT
Organization: Texas A&M University, College Station, TX
Lines: 47
Message-ID: <4eo6hs$[e-mail]>
References: <4elaj2$[e-mail]> <4eo1lk$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 128.194.44.220
X-Newsreader: IBM NewsReader/2 v1.2

In <4eo1lk$[e-mail]>, [e-mail] (W8JI  Tom) writes:
>Hi Paul,
>
>In article <4elaj2$[e-mail]>, Paul Christensen
><[e-mail]> writes:
>
>>Tom:
>>
>>I would think that a 1/2 al vertical would be tough to beat for the
>>really long-haul DX on 160.

>Best 160 antenna I ever used was a dipole at 330 feet or so. I want one
>again. It beat my 1/4 wl vert by 10 dB into Eu night after night, and out
>received my Beverages by a bunch! Thats all I want, I'm not greedy.
>
>73 Tom
>
>

Yeah, that's like a sloop sailing alongside a good row of cannon in a
sea battle.  If you're broadside you get to find out how 3db extra feels!

Besides that, dipoles aren't as well grounded in romancing the stones
below them as are verticals.

Score another 3 db or so.

The last 3 db are a little harder to imagine as the fatal salvo comes.

Perhaps they come from the fact that optimum arrival angles on 160 are
up in the, what, 20 degree or so range?

I think that the vertical's radiation pattern will show one that it has a much

broader total range of vertical angle coverage that that dipole did.  Quite
probably, the dipole was just better optimized at the SPECIFIC range of
vertical takeoff and arrival angles that were required for the path.

It would be interesting to know what comparative results were off the
ends of the dipole and for very long paths, if you can recall or have them
noted.

As thorough as you are, I'll bet that is in your notes as well.

:)

Mike W5WQN as a guest at leviatha.tamu.edu



From [e-mail] Mon Feb 05 21:20:07 1996
Path: news.epix.net!news.sprintlink.net!news.netnet.net!en.com!news.his.com!news.akorn.net!imci3!imci2!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!jeefers.microdes.com!usenet
From: Dave Hand <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: covenants and antenna restrictions
Date: 31 Jan 1996 17:16:29 GMT
Organization: Micro Design International, Inc.
Lines: 31
Message-ID: <4eo85d$[e-mail]>
References: <4egl0v$[e-mail]>
NNTP-Posting-Host: dhand.microdes.com

[e-mail] (CAMILLE J. PRAT, SJ) wrote:
>
>
> A QST -- Lately, some posters have asked for info about actions
> regarding antenna restrictions.  I know I've seen some specific
> cases somewhere, but forgot to mark where.  (Hope others learn
> from this mistake!)
>
> For the interested, some info is available at this URL:
>      http://www.accessone.com/~vbook/hronline.htm
>
> Once you're in, click the "Ham Radio On-Line Library" and look
> for "Complete Formatted PRB-1 text concerning Antenna
> Ordinances".
>
> This is general information and somewhat heavy reading, but at
> least it's solid and a start....
>
> Hope this helps ----  Camille Prat   KB7LBN   [e-mail]
> --


I believe the state of Florida passsed a law that was suposed to
prevent local zoning from preventing ham towers, anyone have any
info on it??? If so I would like to get a copy.

thanks

Dave hand wb4hyp
dhand @ microdes.com



From [e-mail] Mon Feb 05 21:20:08 1996
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in1.uu.net!inews.intel.com!itnews.sc.intel.com!chnews!usenet
From: Cecil Moore <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Off-Center Fed (OCF) Dipole??
Date: 31 Jan 1996 17:52:11 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 15
Distribution: world
Message-ID: <4eoa8b$[e-mail]>
References: <ericr.823020273@access2>
NNTP-Posting-Host: cmoore.ch.intel.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

[e-mail] (Eric Rosenberg) wrote:
>
>I'm looking for information on hte off-center fed dipole, as mentioned by
>Bill Orr in CQ Magazine last year and briefly written up in the ARRL
>Antenna Book.

Hi Eric, I ran one of these in college. The antenna is 180 degrees (half-wave)
on 80m and 360 degrees (full-wave) on 40m. Since sin(60deg) = sin(120deg), a
point 1/3 from the end will give approximately the same impedance for 80m and
40m. IMO, it still needs an antenna tuner but is not a bad match for 300 ohm
ladder-line. Radiation pattern favors the long section.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)




From [e-mail] Mon Feb 05 21:20:09 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in1.uu.net!iglou!iglou.com!n4lq
From: [e-mail] (Steve Ellington)
Subject: Re: Safe distance between dipole feedpoint and metal mast?
X-Nntp-Posting-Host: iglou2
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Organization: IgLou Internet Services (1-800-436-4456)
X-Newsreader: TIN [version 1.2 PL2]
References: <4eo55l$[e-mail]>
Date: Wed, 31 Jan 1996 18:35:46 GMT
Lines: 20

If that were a big problem then how could a beam antenna work considering
they all have metal booms and sit on metal poles on metal towers? What I
usually do is go to the hardware store and buy a pvc tee for plastic pipe
of the size that will stick in the top of the mast. Then drill a hole in
each arm for the dipole wires. Now you have an instant insulator that
will last for years.


[e-mail] wrote:
: I have the apex of a coax-fed inverted v hanging from the top of
: a 20-foot metal mast, and the feedpoint is about 5-6" away from
: the mast.  I've read that it's necessary to keep ladder line
: away from metal, but I haven't found any information regarding how
: close the feedpoint of a dipole can get to metal without
: affecting the performance of the dipole.  Should I move it
: further away from the mast?  If so, how far?  Thanks again!
: --Bill KB8USZ  [e-mail]

--
Steve Ellington [e-mail]  Louisville, Ky


From [e-mail] Mon Feb 05 21:20:10 1996
Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!news2.net99.net!news.cais.net!news.sfo.com!news.zeitgeist.net!news.greatbasin.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: Re: 6 mtr. loops
Date: 31 Jan 1996 19:30:12 GMT
Organization: OS/2 Kicks WIN95 anyday
Lines: 24
Distribution: world
Message-ID: <4eog04$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: vhf.reno.nv.us
X-Newsreader: IBM NewsReader/2 v1.2.5

In <[e-mail]>, [e-mail] (clev
e e massey) writes:
>Has anyone experimented with loops for 6 mtrs.?  I have a two element quad
>for six, but am thinking that for the minimum F/B it gives me, I might try
>building a couple of loops and phasing them at the same height...I know I
>would now have an omnidirectional sig, but the gain of around 8 db might
>just help my QRP sig a bunch more...
>
>Any thought would be appreciated..
>
>Pse e-mail direct...
>
>tnx...cleve/wd5bor

Cleve... I use the KB6KQ line of Horizontal omnidirectional loops
while mobile with great sucess. Norm makes wonderfull antennas that not only
work well but are works of art to look at.

The 6m Loop is 24" in diameter and $65.00 + shipping.

Contact Norm - KB6KQ at [phone] for more info.

I have no financial ties to Norm, I just love his antennas!

Tim - NC7K...


From [e-mail] Mon Feb 05 21:20:11 1996
Path: news.epix.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.antenna
Subject: subscribe
Date: 31 Jan 96 19:54:14 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

subscribe



From [e-mail] Mon Feb 05 21:20:12 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news1!ind-001-236-92
From: [e-mail] (Patrick Croft)
Subject: Re: Patch antenna
X-Nntp-Posting-Host: ind-001-236-92.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
X-Newsreader: News Xpress Version 1.0 Beta #2.1
References: <[e-mail]>
Date: Wed, 31 Jan 1996 21:08:21 GMT
Lines: 27

Jean-Yves Perrier <[e-mail]> wrote:
>Hello,
>
>I've heard about a "patch antenna". I don't know what it look like,
>neither where it is used (!).
>
>Does somebody know something about it, or can point some references to
>me ?
>
>Thanx in advance.
>
>--
>Jean-Yves Perrier
>
>
Have a friend in Japan telling me these are popular cellphone accessories.
Passive device, about 4 inches  square, sticks on window for improved phone
coverage is reported, and many wanting.  I can't say anything regarding the
technical side, and frankly, I don't understand how a antenna with gain can be
of value if the receiving/transmitting unit moves about.  Passive coupling as
I
know it would be so varible under these conditions I think it'd be useless.

Should you find out details, I'm interested enough to request you update us!

BTW, these things are wholesaling around $20-25USD, retailing $60+USD.
GL
Patrick  WB9IQI


From [e-mail] Mon Feb 05 21:20:13 1996
Newsgroups: rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!news1!ind-001-236-92
From: [e-mail] (Patrick Croft)
Subject: Re: One day of sky-high SWR in a dual-band vertical
X-Nntp-Posting-Host: ind-001-236-92.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
X-Newsreader: News Xpress Version 1.0 Beta #2.1
References: <4eo4i7$[e-mail]>
Date: Wed, 31 Jan 1996 21:10:49 GMT
Lines: 16

[e-mail] wrote:
>Two days ago during a very windy day the SWR of the Valor Pro-Am 555
>3-section 16.5' vertical shot up to 5:1.  This SWR persisted into
>the night.  The next morning it returned to normal.  It has never done
>this before, even on windier days.  The coax is fairly new 9913-
>equivalent, tightly connected to S0-239, wrapped with electrical tape
>and protected with metal sleeve at the base of the antenna.  Could
>moisture be getting inside the radome from these temperature extremes
>we're having lately in northern Ohio?  Anyone have this happen to
>their vertical?  Any way to prevent it from recurring?  Thanks for
>your advice/warning/reassurance.  --Bill KB8USZ
>[e-mail]

By chance did the temp change a bunch(30+degrees)?  Condensation
may have got you - 9913 is known for this.
Patrick


From [e-mail] Mon Feb 05 21:20:14 1996
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From: [e-mail] (W2FOE)
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Yagi design and tuning ?'s
Date: 31 Jan 1996 21:34:25 -0500
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I haven't seen that particular software package but the ones I have used
normally allow you to optimize for 3 parameters:  gain, front to back, and
swr.  Somewhere there may be the perfect antenna in which gain (at the
proper elevation angle), and  front to back (how ever you wish to define
it) are optimal at the same point; and the impedance is purely resistive
and 50 ohms at exactly the frequency you wish.  Unfortunatelyl, no one has
ever found it.  Point is, in reality your antenna may not be designed for
a 1/1 swr.

Regards, Merv


From [e-mail] Mon Feb 05 21:20:15 1996
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From: Darrell Barabash <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Help calculating transmission power
Date: Wed, 31 Jan 1996 23:17:03 -0600
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> > Transmitting
> >  Receiving
> >
> > Gain= 10db
> >  Gain=40 db
>

Given microwave frequencies, the gain is usually specified as dBi (i.e.
dB above an isotropic radiator).

So, given that, the required transmitter power is +2 dBm (1.8 mW). But,
don't forget to increase that to account for feedline losses, pointing
error (especially the 40dBi antenna) and fading margin. There are other
factors too but those are some of the more significant ones.

Darrell
Grapevine, TX


From [e-mail] Mon Feb 05 21:20:16 1996
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From: Darrell Barabash <[e-mail]>
Newsgroups: rec.radio.amateur.antenna
Subject: Re: Patch antenna
Date: Wed, 31 Jan 1996 23:24:59 -0600
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To: Jean-Yves Perrier <[e-mail]>

Jean-Yves Perrier wrote:
>

> I've heard about a "patch antenna". I don't know what it look like,
> neither where it is used (!).
>
> Does somebody know something about it, or can point some references to
> me ?
>

A patch antenna can be made out of double sided PC board. One side is
left as a ground plane and the other has the antenna "patch" etched out
of the copper. The patch is usually rectangular or nearly square but
could also be round or elliptical. The dimensions are chosen to resonate
at the desired operating frequency.

These antennas are flat (very low profile) and are generally used in the
GHz frequency area. They can be arrayed to generate high gain,
electrically steerable antennas, etched out of one big piece of PCB
material. The material is not usually fiberglass -- more often Teflon,
PTFE or ceramic.

Darrell
Grapevine, TX