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

[Robert Wood]

Bonding laptop
any good ideas on bonding laptop, seems more difficult with no designed
place to connect to
(recent failure of another usb to serial cable....., a cheap blue one
probably hot from China)

73 Robert W5AJ


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim
Brown
Sent: Monday, May 04, 2015 2:18 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA500: How to troubleshoot "distorted audio"

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
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