[Elecraft] KX3 & KXPA100 into Ameritron ALS-600S

[Vic Rosenthal 4X6GP/K2VCO]

I can tell you that I had similar problems when I tried to do this with 
the K2 back before the K2's 100-watt KPA100 was available. I tried using 
an external 100-watt solid-state amplifier (good quality, made by Henry 
Radio) to drive a one-kW linear. Sometimes it worked, but sometimes 
there was feedback which caused horrible clicks/spurs, etc.

There is a lot of gain external to the KX3 here. I think you have the 
answer in "RF hygiene," which should include separate leads to the power 
supply for the KX3, KXPA100 and ALS-600S (or separate power supplies). 
Good coax and liberal use of ferrites might help too.

On 25 Oct 2014 23:48, David Ahrendts wrote:
> I want to run my just-born KX3 and it’s 100-watt companion KCPA100
> into a high power linear, my Ameritron ALS-600S. But we have some
> issues. For instance: the combo easily produces 600 watts CW. But, on
> SSB it far too easily trips the Ameritron load fault, or the KXPA100
> high SWR shut down. This rather acts like RF feedback. Maybe I just
> need to follow better RF hygiene here (higher quality coax cables,
> making sure RF does not loop back on a power cable, etc.). Any
> collective wisdom appreciated.
>
> David Ahrendts, KC0XT, Los Angeles
>
>
>
> David Ahrendts   davidahrendts at me.com

-- 
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/