Let me give this another try. Anyone out there ever have an issue with a CW Chirp from a K3? Mine seems to be intermittent, it's not always present. I've got a spare K3, I guess I will drive out to the station and swap out the one there now. If it's not the power supply, the only other thing I can think of is an issue with the KSYN3 board. I can try the calibration Wayne mentioned in his 2017 post.
Dana On Wed, Apr 28, 2021 at 5:21 PM Dana Roode K6NR <dana.ro...@gmail.com> wrote: > It was reported today by several folks who heard my CW signal that I have > a bad chirp - I was operating on 20 meters during CWT. I listened to the > signal myself (my station is 80 miles away and I can listen on a local > transceiver). Someone also sent me a recording. > > I've been using the same K3, KPA1500, and Astron power supply for many > years. I shut off the amp and could still hear the chirp. > > One thought is that it has something to do with my power supply, although > I saw a previous posting that made that seem unlikely (below). Wayne > mentioned something about KSYSN3 calibration, I had not heard of that > before, I will look into it. > > If anyone has experienced a problem with chirp on a K3, let me know (it is > a K3 not a K3S). > > Dana > > > > In reply to this post > <http://elecraft.365791.n2.nabble.com/K3-past-chirp-report-tp7625892p7625898.html> > by Doug Smith [W7KF] > Under normal circumstances, it is impossible for a K3 or K3S for exhibit > "chirp." The synthesizer settles well before the rig switches from TX to RX > or vice-versa. > > The KSYN3A (newer synth, used in the K3S) settles in well under 1 ms > thanks to its entirely digital architecture (UHF DSPLL, divided down). > > The KSYN3 (older synth, used on the K3) uses a more traditional PLL with > its VCO running at the target output frequency. It normally settles in > under 5 ms. It can take a bit longer depending on the actual PLL voltage > and VCO frequency. This is accounted for in firmware. > > If your KSYN3 were not properly calibrated, you might see a longer > settling time on one or two bands, most likely 6 meters. If you suspect > this, refer to the CONFIG:VCO MD menu entry. The K3 includes an automatic > VCO calibration routine that requires no test equipment and takes only a > couple of minutes to run. > > Wayne > N6KR > > > > On Jan 19, 2017, at 12:57 PM, "Ron D'Eau Claire" <[hidden email] > <http://elecraft.365791.n2.nabble.com/user/SendEmail.jtp?type=node&node=7625904&i=0>> > wrote: > > > In a synthesized VFO rig like the K3S, any tendency to "chirp" is almost > always related to the synthesizer momentarily losing frequency (or phase) > lock. > > > > While that could conceivably be linked to change in the power bus > voltage, it's highly unlikely since the bus is isolated from the actual > synthesizer by voltage regulators and filters. > > > > OTOH, the OO's report was strictly advisory. I have experienced spurious > OO reports over my >50 years of pounding brass, and one that turned out to > be accurate when I blew the filter caps in the transmitter and did not > notice, nor did the stations I was working report the hum on my signal. > When I got a "chirp" report one time (on a homebrew rig) and was unable to > hear it myself, I sent a friendly letter to the OO. He replied that he was > "almost sure" he could detect a "slight chirp" so he sent the card. > > > > So my advice is that if you can't repeat what the OO observed, don't > worry about it. > > > > 73, Ron AC7AC > ______________________________________________________________ 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
