QRZ! Ham Radio 4/QRZ Ham Radio Callsign Database - Volume 4.iso/digests/antenna/940177.txt

Internet Message Format | 1994-11-13 | 11KB

Date: Fri, 10 Jun 94 04:30:22 PDT
From: Ham-Ant Mailing List and Newsgroup <[e-mail]>
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Subject: Ham-Ant Digest V94 #177
To: Ham-Ant


Ham-Ant Digest              Fri, 10 Jun 94       Volume 94 : Issue  177

Today's Topics:
                 --> Need Antenna Specs! <-- (2 msgs)
                             Antenna FTPs
                 Comet "Miracle Baby"  2m HT Antenna
                   GAP Titan vs MFJ-1798 vs R-7 (?)
                        Has anyone used NLNEC?
        Way to increase power of whip antenna on FM receiver?
                           Yagi ant program

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Archives of past issues of the Ham-Ant Digest are available
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We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party.  Your mileage may vary.  So there.
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Date: 9 Jun 1994 14:23:04 -0400
From: newstf01.cr1.aol.com!search01.news.aol.com![e-mail]
Subject: --> Need Antenna Specs! <--
To: [e-mail]

In article <2s9fdh$[e-mail]>,
[e-mail] (Steve A. Miller) writes:

The easyest 2m/440 ant there is to build is the SO239 ground plane.
here's how to build it:

Parts list:

1-SO239
4-peices #12 Copper wire stripped @ 20 3/16" ( you can also use
brazing wire 3/32")
1-#12 Copper wire stripped 19 5/16" (you can use 3/32 brazing wire)
4-small nuts and bolts (to fit your mounting holes in the so239)
solder and a torch

Construction:

Bend a loop in the ends of the four radials to accept the bolts,
mount them around the SO239 one at a time, be careful not to apply to
much heat, you can very easily melt the insulator.  let the project
cool down after each radial is attached. Once you have attached all
four radial, attach the radiator (driven element ). You must bend all
four radials to 45 deg. downward. That's all there is to it.

Tune it as needed, you should achive a very good match at 146 and 446
( less than 1.2/1)

Have fun

Randy

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Date: 9 Jun 1994 20:12:01 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!msuinfo!netnews.upenn.edu!eniac.seas.upenn.edu![e-mail]
Subject: --> Need Antenna Specs! <--
To: [e-mail]

In article <2t7mm8$[e-mail]> [e-mail] (Randy753) writes:
>In article <2s9fdh$[e-mail]>,
>[e-mail] (Steve A. Miller) writes:
>
>The easyest 2m/440 ant there is to build is the SO239 ground plane.
>here's how to build it:

[deleted - basically you make a 1/4 wave 2m groundplane]

>Tune it as needed, you should achive a very good match at 146 and 446
>( less than 1.2/1)

You get a decent match, but terrible 440 performance.  The 1/4 wave on
2m acts like a 3/4 wave on 440, having a major lobe at a high angle from
the horizon, which might be OK for talking to the birds, but not to
terrestrial stations like repeaters or mobiles.

By putting a coil at the bottom and shortening the radiator to approx. 15.5",
you should be able to get a 5/8 wave whip on 440 and a slightly-base-loaded
1/4 wave on 2m.  You'll end up with a dual-band antenna that has much better
440 performance than a 3/4 wave whip.  Just a thought...

                            --- Jeff
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 Jeff DePolo  WN3A              Twisted Pair: [phone]H  387-3059W
 [e-mail]    RF: 443.800+ MHz   442.400+ MHz   24.150 GHz

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Date: Thu, 9 Jun 1994 15:47:06 GMT
From: ihnp4.ucsd.edu!swrinde!pipex!bbc!ant![e-mail]
Subject: Antenna FTPs
To: [e-mail]

John Hess ([e-mail]) wrote:
: I am a fairly new InterNet user.  Are there any FTPs that specialize in
: (or have) programming for antenna design?

: John Hess
: [e-mail]

try ftp.netcom.com in the pub/rander/NEC directory.

John B
[e-mail]

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Date: Thu, 9 Jun 1994 16:49:33 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!gatech!nntp.msstate.edu!saimiri.primate.wisc.edu!sal.wisc.edu!zimmer!zimmer.csufresno.edu![e-mail].
Subject: Comet "Miracle Baby"  2m HT Antenna
To: [e-mail]

Any experiences with this little (2 in.) rubber thingy?  Is it worth it to
spend $37 for just a smaller size than a regular rubber ducky?  I own a Yaesu
FT11R and I thought that this antenna could complement this xceiver because of
its size.  Thanks.

73,

Rafael
(waiting for ticket)


*******************************************************************
Rafael Solis, Professor        Craig School of Business
[e-mail]    California State University, Fresno
[phone]            [phone] (Fax)
*******************************************************************

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

Date: 9 Jun 1994 15:03:25 GMT
From: ihnp4.ucsd.edu!usc!math.ohio-state.edu!news.acns.nwu.edu![e-mail]
Subject: GAP Titan vs MFJ-1798 vs R-7 (?)
To: [e-mail]

In article <2t57l5$[e-mail]> [e-mail] (Justin Randall Padawer) writes:
>
>Since the magazines are too afraid to do a real head-to-head
>comparison of the three no-radials all-band HF verticals,
>why don't we try to put something together here?  (The
>get-a-beam and get-a-real-radial-vertical comments would
>be unwelcome; the purpose would be to compare these three
>space-compromise antennas.)  Anyone who has had experience
>with 1) the GAP Titan, a brand new no-radial 80-10 offering,
>or its mini-radialed cousin, the GAP Challenger, 2) the
>finally-shipping MFJ 10-band Model 1798, or 3) the 40-10
>meter no-radial trap vertical, the Cushcraft R-7, please
>forward your comments.  I'll post a comprehensive summary.

The only antenna of the above with which I have experience is a
GAP Voyager IV - which is a compromise antenna - no kidding.  Is that
similar to a GAP Titan?  This antenna is 45 feet tall with a six foot dia
top hat.  Worked well on 40, mediocre to bad on 20, bad on 80 and sucked
boulders on 160.  Since you do not want to hear about real-radial-vertical
I will not bore you with the details of how a Cushcraft AP8A beat it in
every band in head to head comparison for DX reception.  Yes, the AP8A has
four sets of five radials ( for different bands ) in a ground plane
configuration, abt 10 ft off the terra firma.

I have counseled a number of hams in my club to use regular multiband verticals
with radials instead of the much more expensive compromises.  It is not question
that an R7 requires much less real estate.  However, the radials are not that
hard to put up.  Even one radial will provide good but directional coverage.
You can load them with coils, lay them on a roof (not great but better
than having a 3 foot stub), bend them etc preferably not slope up or switch
back.


Rajiv
aa9ch
[e-mail]

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

Date: Thu, 9 Jun 1994 16:47:10 GMT
From: news!wrs.com![e-mail]
Subject: Has anyone used NLNEC?
To: [e-mail]

Has anyone out there used NLNEC, the antenna modeling package
for the PC that is sold for $49.00?

How does it compare to mininec or nec2 or any of the other
antenna modeling packages out there?

If someone is a NLNEC licensee, how is the documentation?
At what level of expertise is the documentation directed?

Many Thanks,

73 de KC6RTO
Jerry Pendleton
---

--
Jerald R. Pendleton Email: [e-mail], Personal Email:  [e-mail]
The preceeding message represents only the opinon of the author.  This
do not represent the opinions/positions of Wind River Systems, my mother,
my wife or my poodle.

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

Date: 9 Jun 1994 17:36:36 GMT
From: ihnp4.ucsd.edu!usc!elroy.jpl.nasa.gov!netline-fddi.jpl.nasa.gov!marsupial.jpl.nasa.gov!zipkid.jpl.nasa.gov![e-mail]
Subject: Way to increase power of whip antenna on FM receiver?
To: [e-mail]

I have a AM/FM radio with a whip-type FM antenna perhaps a meter
long. There is a marginal station I'd like to listen to. How
do I increase the capability of the antenna?

Thanks!

--
Kirk Reinholtz, [e-mail], 818-354-6419

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

Date: 8 Jun 94 03:00:00 GMT
From: dog.ee.lbl.gov!agate!iat.holonet.net!wwswinc![e-mail]
Subject: Yagi ant program
To: [e-mail]

I'm looking for an antenna design program for VHF/UHF quad/yagi type
antennas.  Someone suggested that I  obtain a program called AO 6.0,
but I'm not able to locate that program.  Can anyone steer me
towards either that program, or one that will allow me to plug in
frequencies, and number of elements, and have the program do the
work for me?  I would prefer NOT to have a basic program, but will
put up with it if that's all that's available.
--- Fmail 0.98+/RA 2.01+
 * Origin: Boone's Farm BBS, Seattle, WA [phone] (1:343/124)

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

Date: Thu, 9 Jun 1994 14:15:55 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!csus.edu!netcom.com![e-mail]
To: [e-mail]

References <[e-mail]>, <[e-mail]>, <[e-mail]>
Subject : Re: Balloon

In article <[e-mail]> [e-mail] (Daniel T Senie) writes:
>In article <[e-mail]> [e-mail] (Joe Mack) writes:
>>the outer about every 5 secs. So make sure the cable is DC earthed. you
>>could fry your front end.

My Cushcraft 402BA (2L 40M) does this whenever it rains. Before I figured
out what was happening, I left my Ten-Tec 509 & 405 on during a rainstorm,
and it took out the *driver* of the argonaut (not the final) and the SWR
bridge diodes in both the argonaut and the amplifier. Took me a while to
find the "ticking" sound in my shack whenever it rained. All other antennas
were DC grounded from factory - only the 402 has this "defect". 73 Dave WB0GAZ

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End of Ham-Ant Digest V94 #177
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