K2 #4842 has been fb for over a year, and I've been working between
baby diaper changes to complete my KPA100. Everything has proceeded
smoothly through the bias current adjust, but having problems with the
transmit tests. All proceeds okay to about 20 watts. With K2 power
control set to 50W output, I hit TUNE and power output reads 20-25
watts on both K2 and external meter. While TUNING, I increase the
power control pot clockwise, and power quickly jumps up to the higher
(50W) output level. Toggle TUNE off then back on again, and power
again drops to 20-25 watts until I tweak/increase the power control
pot and power out then jumps to a level >50W. Toggle again, output is
back to 20-25 watts out until I tweak/increase the power control pot,
and power then again jumps up to an even higher level. Toggle
TUNE off again and back on, and power out is back to 20-25 watts until
I move the power control pot, etc. etc.. With the power control
pot full clockwise the unit is putting out a full ~110W. I re-did R26
alignment and all seems okay. Checked the common reflector section
and didn't see anything similar to this, so I'm hoping to get some
investigation suggestions from any willing higher powers.
Thank you in advance.
John / K0YQ
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