[Kenwood] ts-940s

[Donald Burns]

ts-940s ser.no. 5100104  the power output is about 110
watts on all bands in cw.  when using fsk (rtty), the
power starts at about 110 watts and slowly drifts down
to 20 or 30 watts.  going back and checking cw, the
output is still about 110 watts.  Whistling into the
mike in either ssb position without the processor on
indicates 110 watts into a dummy load.  with the
processor on the ssb power output when whistling is 20
or 30 watts.  The problem seems to be related to the
processor.  from a cold start the power output drifts
from high to low in about 15 minutes, and will stay at
the low level if checked hours later.  Turning the rig
off for about an hour and checking power out in fsk
and ssb with the processor on will start high and
drift to low again.  The power supply voltage holds
steady at close to 28.5 volts.  any suggestions will
be greatly appreciated.  Don kb8f, 73