Re: [K2] Spurious emission in SSB
Posted by
Don Wilhelm on
Aug 30, 2020; 10:04pm
URL: http://elecraft.85.s1.nabble.com/K2-Spurious-emission-in-SSB-tp7664521p7664526.html
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 Now that the Elecraft transverter interface is obsolete I plan to use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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