I agree, as it appears that the headphones are picking up RF and injecting
it into the radio where it is being quasi detected and thus heard in the
phones. The question, "why does so much RF exist in the shack?" A group of
ferrite beads on the coax at the antenna feedpoint may also solve the
problem. If you have RFI issues on 20M, then there is a likely possibility
that it will or may exist on other bands too. In any event, it's not a
desirable condition.
73
Bob, K4TAX
----- Original Message -----
From: "Martin AA6E" <martin.ewing@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, August 05, 2005 3:16 PM
Subject: Re: [TenTec] RF problem
All the recommendations so far are about treating the symptoms, not
the cause of your trouble. You should not have so much RF in the
shack. A balun or unun at your antenna and/or where your feedline
enters the shack would stop RF flowing on the outside of your coax. I
have no experience with this antenna, but it looks like the coax could
easily pick up induced currents.
73 Martin AA6E
On 8/5/05, Stuart Rohre <rohre@arlut.utexas.edu> wrote:
You may need to experiment with ferrite bead location on each headphone
conductor by sliding them along the wire to cancel RF. When you find
the
"sweet spot" you can use shrink tubing and adhesive to attach the bead
permanently in that location.
Stuart
K5KVH
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