Go with the KPA100. It’s designed and integrated with the K2. Anything else is going to be a maybe-fit or have problems.
Plus you get the RS-232 computer interface as well (although you have to use a special cable!) > On Jul 1, 2021, at 9:15 AM, jerry <je...@tr2.com> wrote: > > All, > > So the K2 yielded up its first sideband QSO this evening. 10M roundtable > of the local ham club. People gave me good reports. > > The next step is to organize up some power. The KPA100 is a mighty elegant > package, but I'm having trouble getting my head around the price tag. > > An alternative might be one of those Chinese amp > kits off Ebay. I actually have one in hand. It requires a bit of redesign > to work well. Mostly, > going to a bifilar-transformer power feed and verifying/optimizing the input > and output turns ratios. And providing a proper switched LPF. > > - Jerry KF6VB > > > > > > > > On 2021-06-30 19:54, Bill Coleman wrote: >> 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 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
