I also agree on the KPA100. One box solution! -73- Frank KG9H kg9hfr...@gmail.com
> On Jul 2, 2021, at 8:07 AM, Bill Coleman <aa...@arrl.net> wrote: > > 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 kg9hfr...@gmail.com ______________________________________________________________ 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
