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 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft
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