W7BRS> comments in-line below.
--- 73, Jeff W7BRS https://blog.w7brs.com On Monday, January 1st, 2024 at 1:21 PM, Andy Durbin <a.dur...@msn.com> wrote: > "Actual Results: The ATU-500 clicks between Bypass and MAN (by "clicks", I > mean only what I can infer from the behavior -- it is as if the ATU-500 is > either using the memory-based ATU settings of the previously tuned settings > and switching between that and what seems like a Bypass mode) -- the clicking > is rapid and persistent at the onset of the CW message." > > How does your KAT500 know what frequency to use? Does it have a serial data > interface or does it depend only on the internal RF counter? > W7BRS> AUX cable between K3 to KAT-500 and KAT-500 to KPA-500. They are in serial communication per Elecraft protcol(s), whatever those are. > What KAT500 mode (AUTO, MAN, BYP) is selected when you observe this anomaly? W7BRS> Per manual for KAT-500/KPA-500 the stated "nominal" mode is MAN. So I leave the KAT-500 in MAN *after* tuning the antenna to 1.1. > > I ask these questions because I doubt the problem has anything to do with SWR > thresholds. > W7BRS> Interesting. I am only guessing that the excessive clicking in the KAT-500 was the KAT-500 going in/out of BYPASS. (This isn't the clicking associated with the Tune-search for L/C. It's a different kind of click. I don't know how else to describe it other than a single kind of click as if it was a single relay in operation in the KAT-500 -- that same kind of 'click' sound that would occur if you switched between MAN and BYPASS on the KAT-500. Same sound. But that's not definitive enough I suppose. I don't have any Serial Log data from the Utility to base that guess. W7BRS> Thanks for the questions. I've got a few other replies to sort through with other suggestions: 1. Try dummy load vs. real antenna 2. Carefully listen if clicks are syncopated with CW (they aren't but I can listen again to make sure). 3. RF/RFI - Not likely except that Serial AUX cable might be picking up some RF.. I could attach some ferrite cores around it to rule out. Otherwise the shack is weighted down with ferrite in all the right places -- Everywhere. /hi/ W7BRS> Thanks again for the questions, very good. > Andy, k3wyc > > ______________________________________________________________ > 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 j...@w7brs.com ______________________________________________________________ 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
