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" <[email protected]> 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 > > > > -----Original Message----- > From: Elecraft [mailto:[email protected]] On Behalf Of Doug > Smith > Sent: Thursday, January 19, 2017 11:09 AM > To: Elecraft Reflector > Subject: Re: [Elecraft] K3: past chirp report > > Yup, that was me. > > There were some good suggestions made here and I’ve checked them all and I’m > unable to get the K3S to chirp. So, at present: unable to replicate.. > > Some of the suggested things I’ve checked: > > 1) SWR at the K3S while driving the ACOM 1500 (same operating conditions) is > 1.05 to 1. SWR between the ACOM and the antenna at the noted frequency is > 1.2 to 1. > > 2) Voltage at the K3S is 13.8 key up and 13.2 key down; seems OK. Power > supply is a switcher which I’ve used for some years. > > 3) K3S is drawing 21.96 amps key down. (Not running 100 watts into the amp.) > > 4) I’ve intentionally “mis-tuned” the amp just in case that is what was going > on when the OO noticed the chirp. I did this by tuning up properly at 14.001 > and then QSYing to 14.083 and transmitting while monitoring with a different > receiver. No chirp, clicks or other anomalies. This is a much worse > operating condition than I normally encounter. It’s so easy to tune the ACOM > that I keep it properly tweaked. Also, I was operating in CW SS and in the > middle of a 2 hour run when the OO heard me chirping and I have a tough time > imagining that I’d sit on a given frequency for two hours without making sure > I was properly tuned. > > 5) I do not use ALC between the K3S and the ACOM. I do run with specific > power levels on each band (great feature, BTW) such that I’m not able to > overdrive the amp. > > 6) I’ve checked my in-the-shack coax jumper cables and I don’t see any > issues. The antenna end of the coax is currently under 2 feet of snow so I > haven’t looked at it. But, I’m getting normal SWR readings here in the > shack. There isn’t any arcing going on or the amp would shut down. No RF in > the shack; no TVI or other issues in the house. > > 7) I recently made 535 QSO’s in NAQP CW and did quite a bit of listening on a > second receiver, never heard a chirp. I wasn’t using the ACOM so I ran the > K3S at 100 watts. And, finally, I have not yet received another OO report > after the NAQP. ;-) > > I dunno what to think. The issue remains unresolved but I am unable to > replicate the problem. > > 73, > Doug, W7KF > http://www.w7kf.com <http://www.w7kf.com/> > > > >> On Jan 19, 2017, at 9:44 AM, Richard Fjeld <[email protected]> wrote: >> >> A few weeks ago, someone had received a chirp report. Did that ever >> get resolved? >> >> Dick, n0ce >> >> -- > ______________________________________________________________ > 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] ______________________________________________________________ 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]
