I have built K2 # 5236, including SSB, 160m, NB and DSP without any
problems but I now need help with the KPA 100.
Initial receiver tests, SWR bridge null adjustment and power calibration
at 5 watts were ok on all bands.
The problem I have now is that when I turn on the high current power
supply, its voltage drops from 13.8 V to less than a volt (presumably as
a result of the PS protective circuit). I tried another high current
power supply, with the same result.
I have done a thourough a visual inspection of the board but can't find
anything wrong.
However using the low current power supply, D13 cathode voltage seems
possibly too high (162 V) an U4 pin 8 voltage too low (-29V).
Q1 and Q2 base resistance perhaps a bit too low ? (11.3 ohms)
What should I check next? Thanks in advance.
73, Vincent G0LMX
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