[Elecraft] K2/100 Has No Output on 80 or 40 When Hot
Phil-W6TQG
de-w6tqg at verinsky.com
Tue Jun 1 00:30:58 EDT 2010
Every since the last Field Day, my K2/100 (#3713) loses output, and the
receiver goes dead, on 40m and 80m when it gets hot. This occurs for
power levels of 9 watts and 100 watts. The 30m through 10m bands are OK.
I can easily replicate the problem when the power amp is connected, but
so far it seems to be OK when it is completely unplugged from the K2.
Turning off the power amplifier through the Secondary Menu does not make
a difference. While transmitting at 9W, the readings on the display for
40 and 80 are "0.1 1.01 - 1". With the power amplifier connected to the
K2, I temporarily connected the antenna to J4 on the K2, so that I could
bypass the power amplifier path. This did not help the dead reception on
40 or 80. I also tried connecting a dummy load through a power meter to
J4 and transmitting at 9W. Again 40 and 80 didn't work but the higher
bands were OK.
I am assuming that the problem is in the LPF of the power amplifier, but
am not sure 30m is OK, while 40 and 80 are not. Any hints would be
appreciated.
73,
Phil W6TQG
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