> Forwarded message:
> From: email@example.com
> To: firstname.lastname@example.org
> Date: 97-05-16 05:21:22 EDT
> >From k7lxc Fri May 16 01:19:13 1997
> Received: from heather.greatbasin.com (email@example.com
> by dayton.akorn.net (8.8.5/8.8.5) with ESMTP id BAA15938
> for <firstname.lastname@example.org>; Fri, 16 May 1997 01:19:12 -0400 (EDT)
> Received: from merlin.libelle.com (merlin.libelle.com [188.8.131.52])
> by heather.greatbasin.com (8.8.5/8.8.5) with SMTP id WAA08724;
> Thu, 15 May 1997 22:19:00 -0700 (PDT)
> Date: Thu, 15 May 1997 18:49:35 -0700
> From: George Worth <email@example.com> (by way of firstname.lastname@example.org (Dick
> To: email@example.com, firstname.lastname@example.org
> Subject: HELP: Rpt noise when windy!!
> Organization: Libelle Productions, Inc., Minden, Nevada USA
> Reply-To: email@example.com
> Mime-Version: 1.0
> Content-Type: text/plain; charset=us-ascii; name="CRACKLIE.TXT"
> Content-transfer-encoding: 7bit
> Message-ID: <337BBD2F.firstname.lastname@example.org>
> X-Mailer: Mozilla 3.01Gold (Win16; I)
> Newsgroups: rec.radio.amateur.equipment
> Content-Disposition: inline; filename="CRACKLIE.TXT"
> NNTP-Posting-Host: 184.108.40.206
> Lines: 31
> Xref: szdc2 rec.radio.amateur.equipment:35016
> X-Newsreader: Yet Another NewsWatcher 2.4.0
> Al, I posted this on rec.radio.amateur.homebrew,misc and equip.
> Chupa Cabara
> I have a question for anyone that may have experienced "crackling" noise
> on their VHF repeater when the wind is blowing. Here is the scenario.
> We were donated a spot on a wooden utily pole which sticks out of the
> ground (the earth here is rock with a couple inches of soil over it)
> about 85 ft. There are 4x4 wooden cross arm systems at a couple places
> on the pole. At each cross arm there are 2) 4x4's bolted through the
> pole with u-clamps at the ends. This is where the 2" pipes are clamped to
> 4x4's for the antenna mounting. All 4 UHF machines work well. No noise.
> The VHF one does not. If the wind blows, the noise gets so strong it
> kicks incoming signals right out of the repeater. We have checked all
> antenna and feedline connections. They are good. What we did find was
> that if we wiggle or touch (with metal object) any (!!!ANY!!!) metal
> parts on the 4x4 support angle irons, 6 ga lightning ground wire which
> runs from the antenna mounts to central pole wire and down, pipes,
> anything metal at all, the noise is horrendous. What we suspect is that
> due to lack of RF ground, there is a pretty decent RF voltage/current,
> whatever, flowing or present on all the metal parts up there. If every
> piece of metal was bonded together and we nail copper flashing to the
> pole to connect RF grounds to, would this get rid of the dreaded
> "cracklies"?? How can we get a decent RF ground for VHF in the earth
> on top of this mountain? Any ideas would be more than greatly
> appreciated. Thanks for your help.
I think you have correctly diagnosed the problem/and a possible cure.
What type of antenna are you using? Perhaps a decoupling skirt might
"tv dinner by the pool,
i'm so glad i finished school" -F.Zappa 1967
"The Revolution will NOT be televised" -Gil Scott Heron
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Administrative requests: towertalk-REQUEST@contesting.com