I have 2 K3s: one I built a year or more ago and one I just purchased
with a sub receiver built at the factory. On the new unit with the sub,
when I transmit there is a tone in the audio. It's pretty constant at
about 2.8 kHz, will vary with the mic gain, is audible in the MON output
as well as on a separate receiver. It is evident in USB/LSB, Data, AM
and FM in the monitor and is present with no mic plugged in. My usual
power supply is a 25 amp switching supply, but the issue remains when i
switch to a 25 amp linear supply. I can unhook everything from the K3
except for power and antenna with no change.
The K3 that I built does not exhibit this problem hooked in the station
the same way--e.g. unplug one from antenna, power, rs232, etc. and drop
the other one in with the same connections.
Elecraft's thinking was that it's an interaction between the main and
sub receiver dsp boards and they sent me a replacement sub receiver dsp
board which I have just installed. Problem remains and was not
changed--still the same tone.
The new unit contains the ATU, sub receiver, digital audio board, and
the 100 W option.
Anyone come across this problem before?
Thanks & 73,
Ken, KY5G
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