[Elecraft] Gentlemen, we have SSB! ( I think )

[jerry]

So I got up at 5:30 this morning and continued stuffing the SSB adapter 
card.  Finished it up this afternoon.

Trying it out, the CPU came up... CW still worked... But no SSB 
transmit, and the SSB receive was very very soft.  Had to turn the AF 
gain up all the way to hear
anything at all.

My untutored diagnosis - something was wrong with that 7-crystal SSB 
filter.

So I pulled the card out, scrubbed it again with IPA, stuck it under the 
microscope to look - again - for solder splashes and  cold joints.  
Scraped off a little something here & there.  Also, I had doubts about 
the connections to the input & output transformers.  So I hit those 
again with the soldering iron.

Put the card back in the K2 - and ...Wow!  Lively SSB receive!  RF out 
on transmit!

   Still need to align the rig.  Piping the output into another ham rig 
through a big attenuator - it sounds pretty good.  One niggle - carrier 
suppression.  If it's nulled out for LSB, it's not for USB.  The nulls 
are in different places on the pot.  I guess you set a compromise 
position, and make sure the carrier is off the skirts of the filter, so 
that can help.

                     - Jerry KF6VB