[Elecraft] Elecraft Digest, KXPA100 RF feedback

[Dave B]

On 23/01/17 02:23, elecraft-request at mailman.qth.net wrote:
> From: E T <etksubs at gmail.com>
> To: donwilh at embarqmail.com
> Cc: Elecraft Reflector Reflector <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] KXPA100 RF feedback
> Message-ID: <AACC9890-B1D0-4D85-A5F0-DB58B2D980BD at gmail.com>
> Content-Type: text/plain;	charset=us-ascii
>
> 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

Hi.

You probably have a bad coax-to-connector problem somewhere.

If you're using PL259 type connectors, even commercially made and
moulded types, it's not uncommon.   The outer braid becomes detached at
the point where the cable enters the connector.

All too common a failing of those things, especially where cheap (braid
over foil) type coax is used.  (Cheap to the manufacturers, not to you
when you perhaps bought a ready made lead...)

Hope you find it.   A simple loop or very short dipole and diode probe
can help.  Run the system at a lowish power where it will run without
tripping, move the probe around the cables/connectors.  You'll find any
leakage that way.   A good cable will hardly indicate, a faulty one will
be "quite lively"...

73.

Dave G0WBX.