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
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73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
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