QRZ! Ham Radio 5/QRZ Ham Radio Callsign Database - Volume 5.iso/digests/infoham/940727.txt

Internet Message Format | 1994-11-13 | 23.3 KB

Date: Fri,  1 Jul 94 04:30:08 PDT
From: Info-Hams Mailing List and Newsgroup <[e-mail]>
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Subject: Info-Hams Digest V94 #727
To: Info-Hams


Info-Hams Digest            Fri,  1 Jul 94       Volume 94 : Issue  727

Today's Topics:
                               900 MHz
                 Best basic antenna tuner reference?
                          Cage Dipole Rings
           COM-SER Labs BR-1000-A Service monitor  HELP !!
                           Ham radio Class?
                            Kenwood TH-78A
        Kenwood TS-450S/AT or Yaesu 890 w/AT -- HELP! (2 msgs)
                          QST H/Brew Isoloop
                              RF hazards
                    Temp. Conversion Chart: F & C?
                     TS440S Service Manual Wanted
                 Waiting for License? Wait some more
                      What hams do on vacation.

Send Replies or notes for publication to: <[e-mail]>
Send subscription requests to: <[e-mail]>
Problems you can't solve otherwise to [e-mail].

Archives of past issues of the Info-Hams Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/info-hams".

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.
----------------------------------------------------------------------

Date: 30 Jun 1994 22:15:25 GMT
From: ihnp4.ucsd.edu!swrinde!elroy.jpl.nasa.gov!wp-sp.nba.trw.com!gatekeeper.esl.com!m22104.esl.com![e-mail]
Subject: 900 MHz
To: [e-mail]

Has anyone built anything for the no-license required 900 MHz band?

I assume FCC type acceptance would not be required for home-brewed, albeit
compliant, gadgets for personal use.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
JD Whitaker - [e-mail] - KE6HEV
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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

Date: 1 Jul 94 03:48:10 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!csulb.edu!paris.ics.uci.edu!ucivax![e-mail]
Subject: Best basic antenna tuner reference?
To: [e-mail]

Anyone can suggest a readable (to the novice to engineering)
text or article on the basic antenna tuner circuits?  I would like
to learn the very basic circuits and be able to build up simple
prototypes to play around with.  I have the ARRL Antenna book and
it is helpful, but not what I am looking for.  For instance, I
know basically how the L-network looks and the Pi-network, but what
the heck does the Differential-T look like?  How does the Z-match
compare?  I want to build up the 5 or 6 basic tuners in small
form to see them operate and get a feel for them - as well as
read a little theory about them.

73

Clark
WA3JPG

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

Date: Fri, 01 Jul 94 05:05:50 GMT
From: ihnp4.ucsd.edu!pacbell.com!amdahl!netcomsv!netcomsv!skyld![e-mail]
Subject: Cage Dipole Rings
To: [e-mail]

In article <2ukiuk$[e-mail]> [e-mail] writes:
>
> > [e-mail] (DAVID SIGLIN) writes:
>
> >      The Cage Dipole is an outstanding antenna system that has been in
> > use in the US Navy for many years. It more recently found its way into
> > use with the M.A.R.S system.
>
> >      Finding the rings is the tough part. If you are interested in this
> > type antenna or want help locating the spreader rings leave e-mail here
> > or on prodigy (UWKJ62A) or give me a call at [phone].
>
> I would be interested in the spreader rings and any tips for keeping
> them in place.  This gives me some ideas too.  I am going to be
> putting up a full wave square loop for 160m.  What if all four legs
> were constructed in the same manner?  Has anyone played with this?
>
> 73, Gary

Tip of the week: Head on down to the local sewing supply shop and ask for
embroidery rings. These are pairs of concentric rings. In various sizes
depending on your skill/ambition level. I've used the to make cage dipoles
in the past. The only ones that really need reinforcement are the ones at
the ends/middle where they connect to a single point such as an insulator
or center connector.

On holding them in place, put the smaller one inside the cage, slip the larger
one around the wires. Once in place to keep it there, use scraps of wire to
twist across the hoop. (Same technique utility wiere are held onto insulators
with).

Have fun. By the way, the concept behind the cage dipole is to broaden the
bandwidth of the antenna. Somewhere it is written that the Q of a dipole is
dependant on (among other things) the ratio of element diameter to length.
building a cage (usually 6-8 wires) allows you to decrease the ratio and
increase the bandwidth.

73 es GM from Jeff



 Amateur: WA6FWI@WA6FWI.#SOCA.CA.USA.NOAM | "You have a flair for adding
Internet: [e-mail]        |  a fanciful dimension to any
 US Mail: PO Box 4425 Carson, CA 90749    |  story."
   Phone: [phone]                |           Peking Noodle Co.

Hate "Green Card Lottery"? Want to help curb ignorant crossposting on Usenet?
E-mail [e-mail] for more information, or read news.groups.

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

Date: 1 Jul 1994 03:54:47 GMT
From: ihnp4.ucsd.edu!usc!cs.utexas.edu!utnut!torn!news.unb.ca!nbt.nbnet.nb.ca!ve1fc.nbnet.nb.ca![e-mail]
Subject: COM-SER Labs BR-1000-A Service monitor  HELP !!
To: [e-mail]

Have a COM-SER LABRATORIES BR-1000-A Service monitor.
Am in bad need of a service manual for the beast.
Have tried to contact the company and they are no longer in
busisness. If anyone knowing of any information re a service manual please
contact me via MAIL or phone
Thanks in advance for any help.
RGDS
Graham
VE1FC
ph [phone]

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

Date: 30 Jun 1994 02:02:00 GMT
From: ihnp4.ucsd.edu!swrinde!gatech!news-feed-1.peachnet.edu!umn.edu!mr.net!winternet.com![e-mail]
Subject: Ham radio Class?
To: [e-mail]

does anyone know where i can take a class and test in Edina, MN or Mpls,
MN? or sournding areas?

Thanks,

--
--
Craig Borchardt  Edina, MN   -= LINUX =-
Internet: [e-mail] FidoNet: craigb@1:282/31
IRC: Craigb -- Talk Requests Welcome -- Phone #: Just Ask
Talk: [e-mail]
Finger [e-mail] for PGP key

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

Date: Fri, 1 Jul 1994 04:23:43 GMT
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!news.tamu.edu!news.utdallas.edu!feenix.metronet.com![e-mail]
Subject: Kenwood TH-78A
To: [e-mail]

In article <[e-mail]>,  <[e-mail]> wrote:
>Athos Facchi <[e-mail]> writes:
>>different models, I decided to get a Kenwood TH-78A. Does anyone out there
>>have any experience with this radio or with Kenwood products in general?
>Athos,
>I have a TH78 and like it very much.  It has good sensitivity for a HT
>and it does  dual-in-band very well.  It is not too bad to
>program, but make copies of the manual, and you will be all set.
>de n1qdq

I have to agree.  My th78a does very well.  In fact a friend of mine who
is an avid Alinco nut is conserding the posibility of buy the 78 over the
alinco duel band TH ( i think it is the dj-580 )  I really like the
extreamly low power option ( .02 wats in VHF and .01 in UHF ) as this is
enough power for close line of sight and allows the battery to last forever !
Use the low power with a vox in the ear mic setup and it works great for
hiking and biking.  The only draw back is the folks at kenwood have decied
to switch the connector for the mic and speaker from the more standard
arangement.  This may give you some grief if you want to barrow a friend's
headset.  Or just get all your friends to buy kenwoods :-)

Dismondo.

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

Date: Fri, 1 Jul 94 01:38:42 -0500
From: ihnp4.ucsd.edu!usc!cs.utexas.edu!convex!news.duke.edu!eff!news.umbc.edu!europa.eng.gtefsd.com!ceylon!noc.near.net!news.delphi.com![e-mail]
Subject: Kenwood TS-450S/AT or Yaesu 890 w/AT -- HELP!
To: [e-mail]

I have the Yaesu 890 with antenna tuner and have been highly pleased with it.
Just took it to Field Day where it performed great.....over 500 contacts
to a butternut vertical.....with the possibility that someday ur rig may
need some service.....the Yaesu service dept gets rigs back to people MUCH
quicker that Kenwood.....Yaesu has a reputation for better audio....u will sound
better to station on other end......73    N6WR

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

Date: 1 Jul 1994 00:32:30 -0700
From: ihnp4.ucsd.edu!usc!nic-nac.CSU.net!csulb.edu!paris.ics.uci.edu![e-mail]
Subject: Kenwood TS-450S/AT or Yaesu 890 w/AT -- HELP!
To: [e-mail]

In <[e-mail]> [e-mail] writes:

>I have the Yaesu 890 with antenna tuner and have been highly pleased with it.
>Just took it to Field Day where it performed great.....over 500 contacts
>to a butternut vertical.....with the possibility that someday ur rig may
>need some service.....the Yaesu service dept gets rigs back to people MUCH
>quicker that Kenwood.....Yaesu has a reputation for better audio....u will sound
>better to station on other end......73    N6WR

Well, I do respect your opinion of the 890, it is a really fine little
rig.  However, your advice is anecdotal, and is not correct in my
experience.

1.  Kenwood service does not take a long time.  I hear this once in
a while, but I have been to Kenwood service several times in the last
two years, and in only one case did it take longer than a week, and that
was for something really fishy with my 440.  They have treated me well
and quickly lots of times.

2.  Yaesu does not have a reputation for better audio than Kenwood in
my neck of the woods.  In fact, the opposite is true, but I don't really
listen to the "reputation" stuff, go out and listen to each one,
the mike makes a difference, as does the individual voice.  I have
heard some guys with 890's that sound great, some sound muddy.  Same
with 450's.

3.  I really admire Yaesu for designing an auto tuner that goes to 160,
that is the only real advantage I see in the 890, and it is a big one
to a guy like me.  If my 10 year old Corsair wasn't far superior to
both rigs in basic receiver performance (flame on ?), I might consider
trying to get one of those little 890 rice boxes.  Nice unit.

73

Clark
WA3JPG

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

Date: Wed, 29 Jun 1994 17:55:09 GMT
From: ihnp4.ucsd.edu!usc!sol.ctr.columbia.edu!news.ess.harris.com!jabba.ess.harris.com!mlb.semi.harris.com!controls.ccd.harris.com![e-mail]
Subject: QST H/Brew Isoloop
To: [e-mail]

Andy Domonkos ([e-mail]) wrote:
: Anyone build the QST loop antenna from the May 94 issue? I understand
: it can be resized for 40M. Anyone do that yet?

: Andy N3LCW

I built a 40 meter loop a few years ago. If you want to experiment with this
sort of thing, I suggest you get a copy of Ted Hart (W5QJR) book about
small high efficiency loop antennas. He came out with the book several years
ago. I would guess that he did a lot of the research, experimentation and
documentation that AEA (Isoloop) and others are now marketing. The QST article
is just a variation of W5QJR's ideas. I didn't read the whole article, but
I don't think the importance of low loss in the variable capacitor was stressed.
W5QJR went so far as to sell a capacitor that was made out of copper plates
with all the parts silver soldered together for low loss.

73's Doug, N4IJ

--
                      ---------------------------
                     |       Doug Snowden        |
                     |     N4IJ            |
                     | email: [e-mail] |
                      ---------------------------

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

Date: Fri, 1 Jul 1994 07:07:36 GMT
From: news.Hawaii.Edu!uhunix.uhcc.Hawaii.Edu![e-mail]
Subject: RF hazards
To: [e-mail]

There was some discussion on the QRP newsgroup regarding RF hazards -
here is one article that hits close to home.

Reprinted with Kevin's permission.

Jeff NH6IL
***************************************************************************

Date: Tue, 14 Jun 1994 08:52:00 -0700 (PDT)
From: "Muenzler, Kevin" <[e-mail]>
Subject: RE: EMF and Ham Radio Operators
To: QRP News Group <[e-mail]>

It is quite true that at the power levels and frequencies that
amateur radio operators use pose little threat from EMF radiation
one must still be very careful when operating at the higher
powers and frequencies.

There are several rules that you should (MUST) follow:

**   NEVER operate your amp with the cover removed!

     This is specially true when operating 2 meters
     and above.  I have a friend who was almost totally
     blinded after making "adjustments" to his 1KW
     440 amp with the cover removed for several hours
     of "testing."  He also had to have one of his
     testicles removed due to the "cooking" effect of
     the radiation from his open amp.  He stated that
     there was no pain in his eyes.  He simply woke up
     the next day in a dark haze.  He did however have
     have significant pain a couple of days later in
     the other area.

**   As Dr Zabrodski stated, use the lowest possible power
     when operating UHF handhelds (its the law also).

     There can be significant heating of the retina by
     UHF radiation, especially in the 900+MHz bands.
     This usually causes no pain and by the time the
     effects are noticed the damage is done and is
     irreversible.

**   NEVER look into the horn of a microwave transmitter (gunplexer)

     If you can see the opening, you are being exposed.
     It only requires a few milliwatts per square centimeter
     to cause significant heating of the retina by a microwave
     transmitter.  As stated above, the damage is almost
     never noticed immediately and is almost always irreversible.


I learned these, among other safety tips by working part-time
at KTSA/KTFM Radio while attending the University of Texas here in
San Antonio.  When working around amplifiers that produce upwards
of 25KW and antennas with 100KW ERP ones learns about EMF safety or
goes blind and sterile.

Amateur radio is perfectly safe if practiced with a little
common sense.  Follow the rules, use the lowest power to maintain
communications.

Kevin,

Legal stuff:
The above opinions are my own and not necessarily those of the staff,
faculty, administration, or lab animals (woof!) of The University of
Texas Health Science Center at San Antonio or anyone else who is
not me.

 ----------------------------------------------------------------------
Kevin R. Muenzler, WB5RUE           The University of Texas Health
[e-mail]               Science Center at San Antonio

         ** There is no such thing as a Monkey-Proof Program! **
         **                I can prove it!                    **
 ----------------------------------------------------------------------

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

Date: 1 Jul 94 03:23:06 GMT
From: ihnp4.ucsd.edu!agate!cat.cis.Brown.EDU!noc.near.net!news.delphi.com!BIX.com![e-mail]
Subject: Temp. Conversion Chart: F & C?
To: [e-mail]

While we're on the topic of conversions, can someone help me
out with some others that have been really boggling me?

   MHz       to   KHz
   Feet      to   Inches
   Dollars   to   Cents

Also, what is that stuff that collects in your belly button
called?

Regards,
Doug Hamilton    KD1UJ    [e-mail]    Ph 508-358-5715
Hamilton Laboratories, 13 Old Farm Road, Wayland, MA  01778-3117, USA

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

Date: 1 Jul 1994 04:57:52 GMT
From: ihnp4.ucsd.edu!usc!elroy.jpl.nasa.gov!lll-winken.llnl.gov!noc.near.net!news.delphi.com![e-mail]
Subject: TS440S Service Manual Wanted
To: [e-mail]

Hi am looking for a copy of the Service Manual for the Kenwood TS-440-S
transcievers.

Pse EMail if you can help.

Thanks, Mark, KE7NS

[e-mail]

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

Date: 30 Jun 1994 21:51:02 GMT
From: ihnp4.ucsd.edu!usc!elroy.jpl.nasa.gov!wp-sp.nba.trw.com!gatekeeper.esl.com!m22104.esl.com![e-mail]
Subject: Waiting for License? Wait some more
To: [e-mail]

In article <2uhojp$[e-mail]>, [e-mail] (Dick
Flanagan) wrote:

> For what it's worth, here is the chronology of my wife's license:
>
> Passed exam:  March 12, 1994
> VEC gave paperwork to FCC:  March 28
> FCC issued license:  June 14
> FCC postmarked license:  June 17
> License received:  June 21
>
> To save you looking at your calendars, the FCC had it in their hands
> for twelve weeks from receipt to postmark.  Time from examination to
> license receipt:  fourteen weeks and three days.
>
> Your milage may--and probably will--vary.
>
> 73, Dick, W6OLD
> --
> Dick Flanagan, W6OLD                             w6old@n6qmy.#nocal.ca.usa.na
> [e-mail]                                 CIS:73672,751 GEnie:FLANAGAN

I also took my test on the 12th of March, at the Sunnyvale VEC, I received
my call on the 6th of Jun.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
JD Whitaker - [e-mail] - KE6HEV
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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

Date: Fri, 01 Jul 94 05:07:23 GMT
From: ihnp4.ucsd.edu!pacbell.com!amdahl!netcomsv!netcomsv!skyld![e-mail]
Subject: What hams do on vacation.
To: [e-mail]

In article <[e-mail]> [e-mail] writes:

  > I had a dream once about  driving down a hill and seeing a tribander on
  > the roof of a 3 story appartment building.  After about 2 months, I was
  > driving down a hill not too far from home and there it was!  (Even in my
  > sleep I scan!)

                Wow, it's like deja vu all over again!



 Amateur: WA6FWI@WA6FWI.#SOCA.CA.USA.NOAM | "You have a flair for adding
Internet: [e-mail]        |  a fanciful dimension to any
 US Mail: PO Box 4425 Carson, CA 90749    |  story."
   Phone: [phone]                |           Peking Noodle Co.

Hate "Green Card Lottery"? Want to help curb ignorant crossposting on Usenet?
E-mail [e-mail] for more information, or read news.groups.

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

Date: Thu, 30 Jun 1994 13:48:23 GMT
From: ihnp4.ucsd.edu!swrinde!emory!europa.eng.gtefsd.com!sundog.tiac.net!usenet.elf.com!rpi!psinntp!arrl.org![e-mail]
To: [e-mail]

References <[e-mail]>, <2uqq19$[e-mail]>, <[e-mail]>arrl.or
Subject : Re: hf radiation

andy domonkos N3LCW ([e-mail]) wrote:
: In article <2uqq19$[e-mail]>,
: [e-mail] (Joseph A. Liu) wrote:
: > John Mollan - Harm ([e-mail]) wrote:
: >
: > : When it comes to UHF signals in the microwave areas, care must be taken,
: > : but these are not the frequencies (about 1000 Mhz) used by ham operators.

The known and accepted hazard is mostly to people physically working on the
antennas and equipment.  Microwaves are dangerous because energy is
easily contained in a small volume.  For example, 25 watts concentrated
in a little piece of metal will melt tin (called soldering irons).
Yet a 25 watt space heater is pretty much useless for heating even a
tiny apartment.

: >
: > Could you talk about this a little bit more? What if your house is located
: > near teleco microwave towers? Could it be harmful?

: If you're in line of site of and in the path (direct or 'knife edge
: refraction from a mountain as was in Leukemia Valley in Northern NJ)
: then you can be in serious trouble. Generally the beam width is small and
: as long as the antenna is high enough over head it probably isn't saturating
: anything below.

Consider this example, you have a big 15 ft dish antenna with a 0.6 degree
beamwidth.  Thus, over the distance of 1 mile, the radiation is mostly
concentrated in an area with a radius around 30 ft.  Thus, if you are
running a 100 watt transmitter, or 10,000 mW, the power density is
0.038 mW/cm^2.  At a radius of 60 ft, the power density is probably down
by a factor of 100.    Thus, if the antenna were pointed at another antenna,
you probably wouldn't be in the region of greatest power density, unless you
were working on that antenna or flying between the two.

Now, most antennas don't have as sharp a beamwidth.  This means the
radiation is spread over a wider area, but you don't have as high a
peak power density.

It may be counter-intuitive, but things like little horn antennas
are actually more hazardous than big dish antennas. The opening of
a little horn antenna may have very high field strengths.  On the other
hand, that big dish antenna may not have high field strengths anywhere
except at the dish feed (again, that little horn antenna).  This is
usually less dangerous, since people tend to associate big dishes with
danger and tend to keep away.  Popping your head *inside* unfamiliar
mechanical structures is often unwise to begin with.

An exception may be periscope antenna systems, which may be banned
by those worried about legal/safety problems.  What you do is you
mount the dish on the ground and bounce the signal off a reflector
mounted on the tower. Obviously, some vandal inside the fence may
easily expose herself to strong fields.
--
Zack Lau  KH6CP/1           2 way QRP WAS
                           8 States on 10 GHz
Internet: [e-mail]   10 grids on 2304 MHz

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

Date: 1 Jul 1994 02:01:55 GMT
From: tymix.Tymnet.COM!niagara![e-mail]
To: [e-mail]

References <[e-mail]>, <2uqn3t$[e-mail]>, <2urr63$[e-mail]>a.ed
Subject : Re: License Renewal

In article <2urr63$[e-mail]> [e-mail] (William J. Turner) writes:
>
>In article <2uqn3t$[e-mail]>, [e-mail] (Dick Flanagan) writes:
>|> In other words, you may continue to operate until you eventually receive
>|> your renewed license =OR= until you are notified by the FCC that it was
>|> not renewed.
>
>So, if you never renew and you never *tell* the FCC you didn't renew,
>you can operate forever?  (Yeah, right!)

When I said "you may continue to operate" I was responding to the original
poster who stated he had made timely application for renewal but hadn't
received his renewed license yet.  Sorry to have confused you.

73, Dick
--
Dick Flanagan, W6OLD                             w6old@n6qmy.#nocal.ca.usa.na
[e-mail]                                 CIS:73672,751 GEnie:FLANAGAN

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End of Info-Hams Digest V94 #727
******************************