It shouldn't really be a surprise, but a number of folks have extra KSYN3 boards after they upgraded to KSYN3A. I am sorting through the email offers, but looks like I will have no trouble finding one.
Dana On Sat, May 1, 2021 at 12:39 PM Dana Roode K6NR <dana.ro...@gmail.com> wrote: > 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
