[TenTec] RF problem

Robert & Linda McGraw K4TAX RMcGraw at Blomand.Net
Sat Aug 6 08:16:29 EDT 2005

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.

Bob, K4TAX

----- Original Message ----- 
From: "Martin AA6E" <martin.ewing at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at 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 at 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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> -- 
> martin.ewing at gmail.com
> http://blog.aa6e.net
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