[Elecraft] Hot KXPA100 Amplifier

[Michael Walker]

Common mode choking solves  a lot of problems.

I'm a believer.

Mike va3mw


On Sat, Jan 31, 2015 at 2:51 PM, David Ahrendts <davidahrendts at me.com>
wrote:

> Would second all of this fine advice. I run the KX3 + PX3 + KAT100 into an
> Ameritron ALS-600S. And those clamp on chokes are essential. Using them
> liberally, and also making sure all the control mini-cables come no where
> close to the high-power coax outputs or the output from the KX3. Tidy
> things up nicely. Keeps the RF going where it should go.
>
> David A., KC0XT
>
> > On Jan 31, 2015, at 10:59 AM, Jim GM <jim.gmforum at gmail.com> wrote:
> >
> > Durring the last month of the ARRL Centennial QSO Party I was behind on
> > points to get into the top tire. So I finally turned on the amp and
> started
> > calling CQ on 20 -10 Meters. I noticed the the amp was getting hot and
> > finally tripped out on high heat. cooling fan helped but not as well as I
> > hoped.
> >
> > I also noticed that the amp ATU would start to re tune on my transmit
> > frequency more than I would like. I finally tracked down the issue and
> came
> > up with a solution.
> >
> > RF was coming back on the RF output cable between the KX3 and KXPA100.
> Some
> > RF was also coming back on the other cables as well.
> >
> > I installed some of those DX Engineering clamp on choke cores. I bundled
> > the inter-connecting cables and put 3 of those cores around those
> cables. I
> > separated the RF output cable from the bundle, and took one clamp on core
> > and wrapped one turn  close to the amp. Took care of my problem and the
> amp
> > ran as cold as a cumber in the frig.
> >
> > COMMON MODE CHOKE POWER !!!  :-)
> >
> > --
> > Jim K9TF
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Elecraft at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to davidahrendts at me.com
>
>
>
>
> David Ahrendts   davidahrendts at me.com
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to va3mw at portcredit.net
>