You might want to check for other sources of RF feedback. I found that the
headphones were a source and placing a toroid just before the connector
fixed the problem. TT later came out with a mod board that plugs into a
board inside the radio that fixed the problem.
Ron Castro
N6IE
www.N6IE.com
Member:
REDXA NCCC
NCDXF ARRL
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of PC Anderson
Sent: Tuesday, January 31, 2012 2:55 PM
To: tentec@contesting.com
Subject: Re: [TenTec] Oll & RF @mic input.
Tnx Stuart, have done the coil cord routine. I guess that I will look
inside.
> >
> Try coiling up part of a mike cable into an orderly solenoid coil, NOT
> scramble wound. You can put it on a pop bottle or other pipe form for
> a test. If that works, you can measure and compute what inductance it
> was and replicate it with a ferrite core, passing the mike cable thru
> and around that for fewer turns.
>
> If you want to get deep into the radio, see if there are ferrite beads
> on the mike connector wiring, and if not, add that. Beads web sites
> usually have application notes on how much equivalent inductance you
> get per bead and you can put multiple beads if there is room. Insulate
> the beads from contact with chassis or other conductors.
>
> -Stuart
> K5KVH
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