[Elecraft] KXPA100 RF feedback

[John Lemay]

Erik

Sounds like an intermittent patch lead. You need to find it, otherwise it
will come back and bite you - guaranteed to be at the worst possible moment
!

John G4ZTR


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of E T
Sent: Sunday, January 22, 2017 18:37
To: donwilh at embarqmail.com
Cc: Elecraft Reflector Reflector
Subject: Re: [Elecraft] KXPA100 RF feedback

Not sure what it was but I seem to have inadvertently fixed it.  I took the
amp out to my Jeep and hooked it up with my KX2 to my screwdriver antenna
and could not reproduce the issue.  I brought it back inside and hooked it
back up and it is working ok, so it must have been a loose connection or
something, even though I thought I had unhooked and reconnected
everything...

In the immortal words of Emily Litella, "Never mind!"  :-)

  Thanks and 73,
  Erik Tkal  -  W1QED

On Jan 22, 2017, at 12:41 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:

Erik,

Apparently something *did* change in your antenna system.  It may not be in
the shack.

Look for something that arcs over at higher power or a loose connector or a
balun that has failed.

73,
Don W3FPR

On 1/22/2017 11:36 AM, E T wrote:
> Today my KXPA100 stopped working properly.  Whenever I transmit I start
getting feedback, a sort of electric stuttering effect.  When the amp is
bypassed this does not occur.  Also, if I transmit into a dummy load the
problem does not occur, indicating that somehow the antenna RF must be
affecting the amp in some way?
> 
> Nothing has changed in my shack since yesterday, and the problem occurs
with both my KX3 and KX2, so it's not the radio.  Everything is fully
grounded to a copper bus bar on my desk.  I performed the factory reset
through the KXPA Utility with no change.
> 
> Has anyone had this happen?
> 
> 
>  Thanks and 73,
>  Erik Tkal  -  W1QED
> 
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