Jerry,
Yes, there is a bit of compromise between LSB and USB on the carrier
null, but it should not be much. Settle for a compromise position.
73,
Don W3FPR
On 6/30/2021 10:06 PM, jerry wrote:
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
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