Keying Interface & RF?

[Galen.C.Walters@siemensrolm.com]

I have had the problem on the low bands only (160 & 80)
The near field rf couples to the interface cable depending
on how much rf is in the shack.  Also dont locate the cable
near the antenna tuner.   I solved it by putting three turns of
the cable on a toroid core (Radio Shack)  located at the
circuit end of the cable.  I have the circuit at the end of a 3ft
cable  in a plastic box and then a short cable to the xmtr.
and it works FB.

KN6OZ

 ----------
From: thehalls
To: trlog
Subject: Keying Interface & RF?
Date: Wednesday, August 07, 1996 7:28AM
Priority: Low

Hello Fellow TR Users:

    First of all I have to admit that I am mostly an appliance operator...

    My problem concerns the homemade keying interface that I put together: 
It works great on 80, 15, & 10m, BUT when I try to use it on either 40 or 
20m it seems to get some kind of RF (?) interference. I put the little board 
in a metal box, used shielded cable...

    Has anyone had this problem or have any other tests that I could try? I 
was so proud of myself that I actually built the little gismo!

    Thanks for any input,
        Eric WD9GGY
        thehalls@ix.netcom.com
(sometimes it's better to be geograhically challenged, then mentally 
challenged...)