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Hi Gang,
I reviewed my printouts of the BC interference topics and 10 Khz
birdies with Charlie, W0CD, last night.
Charlie feels the problem must be a connection problem in the beverage
it self or a NEAR FIELD effect, especially if W0SD's problems are only
on a EU beverage and not on a JA beverage.
So, I recap: check the wire, check the grounding, check the
transformer, check the hardline coax to the shack, check the switchbox,
check the preamp (if used), check radials from the shunt fed tower
transmitting antenna that are near the EU beverage, and look for a near
by metal structure with questionable joints.
I also think that "thinking sideways" may help. All with problems
should read the repeater problem in the middle of Dec 96 QST. They
found a high SWR and started blaiming cavities or cavity connections.
They eventually found the repeater was on 138 Mhz not 146.88! They
couldn't find why the frequency jumped, but by tweeking tuned circuits
and replacing tubes in the RF strip, they got it back on track.
Good luck, and hope this helps
George, K8GG
______________________________ Reply Separator _________________________________
Subject: TopBand: Re: AM Broadcast Interference
Author: davekennedy@juno.com (David Kennedy) at BC_INTERNET
To: <topband@contesting.com>
Date: 12/3/96 7:55 PM
Dave Kennedy, N4SU wrote:
>Thanks to several who commented on my message to Ed--K0SD
>re B.C. sigs every 10 Khz across the 160M band.
>Among other things my message said "don't waste your time and
>effort building low pass or band filters expecting to eliminate these
>sigs". I should have said "don't waste your time and effort building
>high pass or band pass filters expecting to eliminate these sigs".
>Thanks again for the comments, most of them were transmitted to
>the congregation.
>73 Dave N4SU
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