[TowerTalk] Spurs and Harmonics new antenna

[Dennis Watkins]

You might think about putting the rig on a 12 volt
battery.  A while back I remember seeing as
bit about power supply noise..I would take a good
look at the rig..my money is on that being the source of the noise..
----- Original Message -----
From: "bill thomas" <k1xt@hotmail.com>
To: <towertalk@contesting.com>
Sent: Wednesday, December 05, 2001 8:49 AM
Subject: Re: [TowerTalk] Spurs and Harmonics new antenna


>
>
>
>
> >From: w5kft@nts-online.net
> >To: Towertalk@contesting.com
> >Subject: [TowerTalk] Spurs and Harmonics new antenna
> >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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supporting towers up to 100 feet for under $1500!!  http://www.anwireless.com

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