The cause of my chirp is my K3SYN board; the intermittent nature was purely related to what frequency I was on. Turns out when I was on 14044.74, plus or minus a little, the chirp was there, even when I was transmitting at a few watts out. I did the Config VCO Cal procedure Wayne mentioned, didn't fix the problem, nor did reseating the board and doing the procedure again. There is a mod from 2010 or so to correct a problem like this, but my board already has this done (r20 is 25 ohms not 50). I have an older K3, and I moved its K3SYN board to the newer K3, seems to work fine, no chirp. Meanwhile, I put the odd K3SYN in the older K3 and the chirp is there, same frequency.
I'm not sure if I caused other issues when I swapped the boards, so if you hear me on, drop me an email to let me know how its sounding. The older board doesn't have the metal plate stiffener on it, nor does it have the 2010 mod. Meanwhile, I'm in the market for a K3SYN board. Don't know if elecraft has them as spare parts or can repair the one I have. Will have to ask. Dana On Fri, Apr 30, 2021 at 10:44 AM Dana Roode K6NR <dana.ro...@gmail.com> wrote: > 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
