[TenTec] Oll & RF @mic input.

Ron Castro ronc at sonic.net
Tue Jan 31 15:11:04 PST 2012


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 at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of PC Anderson
Sent: Tuesday, January 31, 2012 2:55 PM
To: tentec at 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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