[Elecraft] K2 SSB Receive issue

[Don Wilhelm]

  Go back to the filter alignment and look at the BFOs for each filter 
(you may look either at the DAC values or at the frequency).  If the 
settings for LSB are the same as you have for USB, then you have the 
BFOs set to the wrong sideband.  Use 40 meters for this test so there is 
no confusion about sideband inversion.

It would appear that you have the BFOs for USB correct, but not for 
LSB.  The LSB DAC values (and the as a result the frequency) must be 
lower than those for USB.  The dispaly in Spectrogram will look similar 
whether it is LSB or USB, so if you were not conscious of the frequency 
(or DAC value) during the process it is easy to set it to the wrong 
sideband - it looks right, but it is not.

If you look at the frequency of the BFO used for OP1 as FL1, LSB will be 
near 4913.5x and USB will be near 4916.5x.

That could also explain the frequency discrepancy when looking for the 
frequency of a signal peak.

73,
Don W3FPR

On 1/15/2011 7:33 PM, KA1YMX wrote:
> I used my K3 to transmit a USB/LSB on all bands except for 10m. The only two
> bands that I could receive a readable SSB signal was on 20m and 17m. I tried
> USB and LSB on all other bands and could not receive a readable signal. I
> used my S-Meter to adjust the frequency on the signal in which I did not
> have a readable signal and the peak of the signal on the K2 was about 2.2
> khz below the indicated frequency on the K3.  I adjusted and verified the K2
> is on frequency using WWV prior to performing this test so I know both the
> K2 and K3 are on frequency.