Except that it only happens in SSB, it sounds suspiciously like the high
power amp (final) has failed in your K3S. But start with your audio.
Are the settings normal (comp, mic gain etc)?
Can you try another microphone and turn on the monitor function to hear
what your mic is producing? Is the two-tone function accidentally on?
What power output can you read when not using the amp and going above 12
watts? If more than 12 watts, a calibrate output would be in order for
for your confidence.
Is it confined to one band?
If you don't get direction of the cause from these tests, a phone call
to Elecraft service is in order.
73,
Rick NK7I
On 3/3/2020 10:48 PM, Tony wrote:
All:
I've noticed an unusual thing happen with my K3S and KPA500 amplifier
while in SSB mode. When I increase the K3S drive beyond 12 watts, the
KPA500 power drops-off dramatically. This only happens in SSB mode.
The KPA500 functions fine with other transceivers as well so the
condition appears to be unique to the K3S. Any suggestions?
Tony
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