[Elecraft] KPA500: How to troubleshoot "distorted audio"

[Jim Brown]

On Sun,5/3/2015 10:21 PM, Matt Zilmer wrote:
> Check your RF ground.

WRONG! A connection to mother earth has nothing to do with solving RFI 
issues, nor does it make antennas work better.

RATHER -- check BONDING and SHIELD connections -- is there a coax with a 
bad shield connection? Is every equipment chassis in the station bonded 
to every other chassis? That includes computer, rig, power amp, other 
accessories, the PSU for the rig. Is there a bond from there to power 
system "ground?"

Since this is a problem that was not there before and is now, look for 
things that could have failed or changed. If it were not for that, I 
would be suggesting common mode chokes at the feedpoint of the antenna 
in use.

When it worked before and doesn't work now, always ask "what might have 
changed (broken)?"

73, Jim K9YC