[TowerTalk] Spurs and Harmonics new antenna

[Chris BONDE]

This I like!!  Whar frequency?  If we had the correct frequency, maybe we 
would not need 1KW out.

Chris opr VE7HCB

At 10:49 AM 2001-12-05 -0600, bill thomas wrote:




>>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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List Sponsored by AN Wireless:  AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 100 feet for under $1500!!  http://www.anwireless.com

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