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

[Robie Elms]

Good question.  Would the point where the video connector attaches to the laptop work?  

Robie - AJ4F 

> On May 4, 2015, at 09:55, Robert Wood <woodr90 at gmail.com> wrote:
> 
> 
> 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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