Dear all,
I have got the answer from Elecraft that C80 and C81 in the KPA100 driver section should be increased to 5600 pF. I had
already soldered 2 additional 4700 pF caps parallel to C80 & C81, which cured the problem for me. I will reduce the
capacity of C80 and C81 down to 5600 pF later.
Vy 73 de Martin, DL6KMR
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Gesendet: Montag, 6. Juni 2005 12:43
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Betreff: [Elecraft] Low power on 20m using the KPA100 option
Dear all,
last weekend I finished the KPA100 option, which is causing a little problem. Everything Is running well except power on 20m, where I just reach 50 Watts.
The QRP output is not affected, so I am quite shure that the RF path to the antenna
through the LPF is ok. Just to be shure I have checked all inductivities and capacities of the 20m filter. They are ok including the used core types of the inductivities.
Somehow I am getting the impression, that on 20m the PA doesn't get sufficient driver Power. My signal reports on 20m have been ok, except the "missing 50Watt". This issue
drives me realy crasy, because everything else is working ufb.
Any suggestions?
vy 73 de Martin, DL6KMR
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