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1994-11-13
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Date: Wed, 9 Nov 94 04:30:24 PST
From: Ham-Ant Mailing List and Newsgroup <ham-ant@ucsd.edu>
Errors-To: Ham-Ant-Errors@UCSD.Edu
Reply-To: Ham-Ant@UCSD.Edu
Precedence: List
Subject: Ham-Ant Digest V94 #372
To: Ham-Ant
Ham-Ant Digest Wed, 9 Nov 94 Volume 94 : Issue 372
Today's Topics:
7 dB for $7
Leaning R7
Pigeons on beam
Twinax for feedline
Send Replies or notes for publication to: <Ham-Ant@UCSD.Edu>
Send subscription requests to: <Ham-Ant-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Ant Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-ant".
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: Tue, 8 Nov 1994 14:35:04 GMT
From: bsplaine@dogxray.sr.hp.com (Bill Splaine)
Subject: 7 dB for $7
: Questions:
: 1) Did anybody who replied actually build it? How were your results?
: Were you able to measure the gain, and did it approach 7 dB (and
: is that dBd or dBi?)
: 2) Did anybody capture all of the replies to a disk file? If so,
: kindly reply (thru the anon-service, as instructed below). Much
: appreciated to anybody who can provide this info.
Jim, I *will* cooperate, no need to get fidgity about the nitro....
: I recieved a shipment of 40 pounds of nitroglycerine. If they don't
: cooperate with us then we'll kill him.
I spoke with a few who built it and said it is the best they have ever had
in the air. Most were using big sticks like the Comet and Diamond bases. I
found one fellow in my local club who built one with his son and they love it.
I will build one this winter some time.... sounds like cheap fun. I live in
a poor area, rf wise, and need all the help I can get. I am really like a
hidden packet station, unfortunately, so the guys with more power can't hear
me..... therefore, they go right over the top of me..... Where's my kw???
73 es GL, Bill
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------------------------------
Date: 8 Nov 1994 12:03:27 GMT
From: wvanho@infinet.com (W. E. Van Horne)
Subject: Leaning R7
Marq Linden (marq.linden@pcappbbs.com) wrote:
: I just recently installed an R7 on my roof, and the mast that I used to
: support it was from Radio Shack and although it appears to be very
: strong it appears to be to narrow.
: The collar that is attached to the bottom of the antenna has two rings
: and the screws to tighten mast are on the same side of the ring on both
: rings. Consequently when it tightens up snug it forces the antenna base
: to lean slightly and by the time it reaches the top of the antenna it is
: leaning about a foot.
: My question is two parts will a large diameter mast eliminate this
: problem? And where do I order a 4 or 5 ft mast like that?
: If I could here from anyone else who has installed this antenna It would
: be greatly appreciated.
: Marq KA2MQF/6
I have an R-5 mounted on top of the same RS mast, and had the identical
problem. I solved it with dowel sticks, 1/4", 3/8", and 1/2". I cut 12"
long lengths and used them to fill in the space between the small
diameter R-5 base tubing and the large diameter mast. About 9" of the
dowel is down inside the mast, and 3" above. I hold them all in place
with two hose clamps above the top of the mast.
I won't try to draw a sketch using ASCII characters :-). I think you see
the point. Good luck!
73, Van - W8UOF
* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* It ain't wot ya don't know 't gets ya into trouble. *
* It's wot ya know 't ain't true. - "Mr. Dooley" *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
wvanho@infinet.com
------------------------------
Date: 8 Nov 1994 17:06:29 GMT
From: mconner@rain.atms.purdue.edu (Mark D. Conner)
Subject: Pigeons on beam
In article <39o8pb$8iv@newsbf01.news.aol.com> dbotkin@aol.com (D Botkin) writes:
>In article <9411071629.AA13018@royac4.royac.iac.es>,
>hosinsky@royac4.royac.iac.ES (goran hosinsky) writes:
>
> Does anyone have an idea how to protect a beam from pigeons?
>
>I saw a picture in QST (I think) of a good idea - a guy put a plastic owl
>on top of his beam. Says the pigeons have left and never returned. The
>owl came from a garden supply store, intended for use to keep birds &
>bunnies from gardens, and looked quite realistic.
Must be very realistic or the pigeons are easily fooled. Most of the
plastic owls I've seen have pigeon **** all over them.
Supposedly the eyes make or break the "decoy". If they're glass or
are otherwise shiny, that does better than an owl with a painted face
and eyes.
--
Mark D. Conner - N9XTN Opinions expressed here are
Dept. of Earth & Atmospheric Sciences not necessarily those of the
Purdue Univ., W. Lafayette IN 47907 Government, DoD, Purdue, or
mconner@rain.atms.purdue.edu the author.
------------------------------
Date: Mon, 7 Nov 1994 08:08:44 GMT
From: wa2ise@netcom.com (Robert Casey)
Subject: Twinax for feedline
In article <39ht1g$o99@monopoly.callamer.com> choffman@pinot.callamer.com (Christopher R. Hoffman) writes:
>Can anyone tell me if Networking TWIN-AX can be used as an unbalanced
>feeder? I salvaged a few hundred feet from a network overhaul this
>summer.
>
>For those of you who don't know, This is comparable to RG8, accept that
>it has TWO inner conductors instead of one. This is used primarily for
>IBM networks.
>
If you have a transmatch with balanced output, maybe you can feed
a dipole using the twin-ax. One inner conductor to one leg of
the dipole, other inner conductor to the other leg. Shield not
connected to the dipole. Or a folded dipole if the twinax impedance
is around 200-300 ohms.
If no transmatch, maybe a balun going from 50 ohms to 200 ohms?
------------------------------
End of Ham-Ant Digest V94 #372
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