Chris,
I suspect that artifact is being introduced by the Speech Processor on
the KSB2 board.
Do you know any locals who have a K2? The quickest way to verify my
suspicion is to swap out the KSB2 board.
BTW - TUNE switches to CW even if in SSB mode.
73,
Don W3FPR
On 8/30/2020 1:07 PM, G3WIE wrote:
I built K2 s/n 253 many years ago, and it's been updated with the A-B kit and
all other Elecraft updates. It currently has the KSB2, noise blanker and
160m/2nd Rx options. The ATU is not currently fitted to make access easier,
though it has been.
I'm planning to use the K2 with transverters on 28MHz for the microwave
bands. Now that the Elecraft transverter interface is obsolete I plan to use
the radio with ~1W output and fit attenuators as required.
Looking at the Tx output on my spectrum analyser, I see a spurious tone
900kHz below the tx frequency which is only about 35dB less than the SSB
peak output at 1W; that frequency difference does not change with dial
frequency. The tone does not change amplitude with power setting over the
full range, with speech amplitude, nor with the carrier balance adjustment.
It's also present on 21MHz with the same interval. It is not present in
Tune in SSB mode, or in CW mode at all.
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