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
