Topband: Beverage Noise pickup

[jbattin]

----- Original Message -----
From: "Greg Chartrand" <w7my at yahoo.com>
To: <Topband at contesting.com>
Sent: Friday, January 09, 2004 10:07 PM
Subject: Re: Topband: Beverage Noise pickup


> >Clive:
> >The best way to decide if the TX antenna is
> "re->transmitting" noise into the RX antenna, just try
> >opening and shorting the TX feedline
> >while listening to the noise on the RX antenna.
>
> Actually this is not true. A non-shunt fed vertical
> (i.e. ungrounded) only needs a few pf to ground to
> initiate re-radiation. only one foot of coax connected
> to the vertical will cause it to make it mess up other
> local RX antennas. A relay opening the vertical
> element to any matching components or coax can stop
> the re-radiation. I'm not sure how to make it go away
> with a shunt fed arrangement.
>
    I do not believe the comment was to insinuate that open/shorting the
coax would make the coupling go away ... but the chances are very high that
if there is problem this will cause the noise to change amplitude at least a
little bit.
K9DX

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