Dave,
How is receive with the KPA100 in-line? If receive is degraded, then
the KPA100 LPF may be the problem, but if power output is the only
problem than the PA transistors (or the T/R switch) is the area that
needs attention.
The first step that I would take is to check the bias adjustment - do
the steps indicated in the manual. Secondly, check the RF voltages at
the input to the KPA100 and the bases of the PA transistors - if the
bases are receiving RF, then the KPA100 should amplify.
73,
Don W3FPR
Dave White wrote:
I have a KPA-100 that is not putting out any power. The K2 operates
fine using the standard "QRP" power (up to 10 watts). Power is good
and the SWR is low. When the power control is advanced to bring in
the KPA-100 (relay "click"), the power reading immediately goes to "1"
and there is no power output. The KPA-100 is recognized and the PA is
turned "ON" in the setup menu. Everything else appears normal .This is
a used KPA-100 and there are no obvious signs of damage; the
construction quality looks to be excellent. The previous owner said
there was no history of problems.
Any quick ideas on where to start the troubleshooting process? I have
some "hobbyist" test equipment and "modest to good" troubleshooting
skills.
Thanks in advance for your help.
Regards
Dave White, VE6DRW
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