[Elecraft] RFI in audio chain

[Bob McGraw - K4TAX]

You more likely need a common mode choke on the feed line close to the 
radio.  Perhaps where the feed line enters the house.  A common mode 
choke can be also known as "The Ugly Balun" 
http://www.hamuniverse.com/balun.html or can be a series of ferrite 
beads on a section of coax.

Also see Model # 8232 found on The Wireman website. 
https://thewireman.com/prodpix2.html <https://thewireman.com/prodpix2.html>

73
Bob, K4TAX

On 11/22/2015 5:02 PM, Jan Ditzian wrote:
I have a problem that appears to be changing, but I could use some 
help.  The problem is RFI in the audio input (microphone input) when I 
use my vertical antenna on 40 meters.  Here is a rundown of what has 
happened: