On 8/18/2017 6:38 PM, Barry Simpson wrote:
I then needed to adapt the arrangements to get the KPA500 working from the
TS990 serial port at the same time.
Hi Barry,
You might want to re-think WHAT control of the KPA500 you need. The
KPA500 is quite good at VERY quickly sensing the frequency of the RF
driving it, and changing bands as required.
The ONLY control I have been between my rig (a K3) and the power amp is
the AMP KEY signal to put the KPA500 in TX mode. All that takes is an
RCA cable between the rig and amp (as long as there's an RCA on the rig
for AMP KEY), and if the rig's AMP KEY is on a different connector, a
suitable adapter or cable with that connector one end and an RCA on the
other.
When I want to change bands, I simply give the amp a dit on CW or tap
the mic on SSB, and the KPA500 is on the right band.
I hope you know that ALC should NEVER be used as the primary control for
output power, because that is a recipe for nasty distortion -- splatter
on SSB, clicks on CW. Rather, we should ALWAYS set power by varying the
output of the rig so that we get the desired power from the amp. My KPA
will get to full power with 25-30W drive, depending on the band.
73, Jim K9YC
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