Problem solved by resoldering everything around TX Buffer U9. Many thanks to
Don Wilhelm W3FPR for his sage advice. The radio would be going back to
Elecraft now without his insisting I try it one more time.
Chuck, NN7U
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Yes, it's good. I just got it back together and it appears to be working.
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http://elecraft.365791.n2.nabble.com/K2-diminishing-power-on-15-to-10-meters-tp7559611p7559641.html
Sent from the Elecraft mailing list archive at Nabble.com.
I just finished installing the KAT2 and in testing discovered that power
output begins dropping on 15 mtrs. I removed the KAT2 and tested the plain
K2 into a dummy load, with the same results. I redid the transmitter
alignment but it didn't change the results, which are, with a 10 watt
setting:
Chuck,
Did you ever increase the value of R98 on the bottom of the RF board to
keep the power from oscillating? If so, you have now removed the
additional gain of the KPA100 and may need to restore the original value
of R98. Remove the bottom cover and check the value of R98 - if it is
Interesting, I am working on a KPA100 problem right now. The original
problem was reduced output on 15m, but when I disassembled the KPA100, I
found a burned trace on the circuit board in the bias current circuit
feeding Q4.. which seems unlikely to have caused a problem only on 15m. I
plan to
Not having the schematics in front of me and not being familiar with the
unit...PCB traces don't usually burn on their own. Did Q4 check as good? Might
be worth some desoldering to put an ohmmeter on it.
73 de N5ILN
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On Jul 21, 2012, at 7:40 PM, aj4tf aj...@arrl.net wrote:
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