K2 SSB adapter problems

Posted by on Jan 14, 2020; 6:22pm
URL: http://elecraft.85.s1.nabble.com/K2-SSB-adapter-problems-tp7657829.html

Hello,

I have been working on a new K2 the last couple of months. SN 7927

Yesterday I finished and installed the KSB2 SSB adapter.

I have been mostly listening. All seemed normal with receive on 80 and 40 meters, on LSB.

But, as soon as I go to USB on any band below 21 mhz, or LSB 21 and above, the S meter goes to nearly full scale, and the receiver is desensitized. If I turn off the AGC, the receiver seems to work normally receiving both LSB and USB.

I have checked the BFO values and used the default value of 4916.3 for USB and 4913.5 for LSB.

No setting of the USB BFO seems to solve the issue. I can change the value and drop the S meter with AGC on and hear the Receiver apparently return to normal, but then I can’t tune USB and the number I am using then is close to the LSB value.

Why the receiver works normally with AGC off, but not with AGC on on OP1 filter is puzzling to me. Everything is normal on the K2’s internal filters.

I assume this has something to do with the crystal filter and BFO frequencies, but no idea where to go.

Any ideas would be appreciated.

73 Chuck K8LBH

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