Interesting topic. I actually had a tx gain cal failure with a new K3S on 6M but a subsequent tx gain try, it passed. I didn’t make any mistakes putting it together. Kind of an anxious moment with a a new rig right out of the box, but it did pass. I’m kind of shy to ever run tx gain cal again. 😳
Chuck Jack KE9UW Sent from my iPhone, cjack > On Jun 3, 2018, at 4:59 PM, Don Wilhelm <[email protected]> wrote: > > Knut, > > Do you have a power loss on some bands that is not cured with a TX Gain > Calibration? > Have you measured the receiver MDS and found it to be lacking from the last > time you measured it? > > If the answer to both those questions is "NO", then the answer is that it > does not need any alignment. > > Older tube rigs may be a different matter, but modern components are not as > prone to value changes with age as they were "back then". > > This applies to any transceiver, and is not particular to the K3 or any other > one transceiver. > > I have serviced K1s and K2s K2s that I had fully aligned and calibrated > several years before, and find them still in perfect alignment (although I do > go through the alignment procedures on those I service again just as a check). > > Unless you have adequate instrumentation, I would not attempt it. > It would be simpler to send your K3(S) back to Elecraft than to attempt it > yourself - by the time you obtain adequate instrumentation, you will spend > more money on the project than a trip to Elecraft. > > Then you mention the other problem - lack of full instructions. Those are > not available for the K3(S). Elecraft has automated testing lines set up to > do that job. > > 73, > Don W3FPR > > > >> On 6/3/2018 4:53 PM, ab2tc wrote: >> Hi, >> Very recently there was the same question asked about the K1. I don't recall >> any mention of this topic on the K3 on the reflector. It has internal >> trimmers on the per ham band HF filter. Is it advisable to occasionally >> touch these up? I have no reason to believe that my oldest K3 (ser#82) is >> out of alignment, but I'd like to be ahead of the game. I am old enough to >> have used tube rigs in my early ham career and they definitely needed >> occasional tune up. The narrow band ham band RF filters in the K3 have >> relatively high Q so the slightest component drift will quickly affect the >> shape of the filter curve. >> If the answer is affirmative, could we get a procedure for doing it >> properly? Tuning for max signal at the center frequency may not produce the >> proper shape of the bandpass filter (flat top for the required bandwidth). I >> know from my previous career as an RF engineer that tuning LC bandpass >> filters can be tricky. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
