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[TowerTalk] Spurs and Harmonics new antenna

To: <towertalk@contesting.com>
Subject: [TowerTalk] Spurs and Harmonics new antenna
From: k1xt@hotmail.com (bill thomas)
Date: Wed, 05 Dec 2001 10:49:13 -0600



>From: w5kft@nts-online.net
>To: Towertalk@contesting.com
>Subject: [TowerTalk] Spurs and Harmonics new antenna
To: <towertalk@contesting.com>
>Date: Wed, 5 Dec 2001 09:59:54 -0600
>
>
>
>       I installed a new 75 meter delta loop on Tuesday.  Its 265 feet
>total length, cut for 3.795 khz.  SWR is acceptable, less than 2.0
>to 1 on that freq.
>
>       Problem is that when using this antenna I have a spur or
>harmonic every 10 khz across the 75 meter band.  All the way from
>3500 up to 4000 the spur can be heard every 10 khz starting
>exactly on 3.500, in the DX window 3770-3780-3790-3800 the
>sput peaks at about 30 db over S9.  All connections on the
>antenna, coax and fittings check solid.
>
>       The delta loop is hung from the top of a 80 foot tower that also
>has a HyGain TH11 and Cushcraft 402CD on it.
>
>       Weird thing is that if I key the transceiver (TS-940SAT) the spur
>will go away for about 2 seconds and then returns again.
>
>       OK you list guru's.....what are your ideas and suggestions, this
>one has me stumped.  Any suggestions on how to find the source
>and cure this problem would sure be appreciated....
>
>Bryan W5KFT
>

I think you have something very nearby, perhaps in your own house, that is 
emitting the spurs.  Perhaps it's a television or computer monitor or God 
knows what.  As for transmitting and disrupting the source, I had a similar 
experience.  A few years ago I had a neighbor who had a touch lamp that 
caused me grief with the noise that it emitted.  I found that if I keyed the 
transmitter at about a KW it would disappear. I was actually turning it off 
with my signal.  A month went by, and then I never heard it again.  They got 
rid of it.  I wonder why?  Good luck.

Bill K1XT

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