The K2SB was absolutely the hardest kit to build out of the entire K2. There are a lot of parts, and it is a very small board.
> On Jun 30, 2021, at 10:06 PM, jerry <je...@tr2.com> 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 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to aa...@arrl.net Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
