Fred sent me the video, which is actually very revealing. First the change rate is very rapid, higher than I initially expected. The asterisk is on constantly, and the power off time is not long enough for power to drop to zero. But what I found very interesting is that the output power indication on the K3 is fluctuating at the same rate as the KPA500 is indicating. That leads me to believe that the K3 output is rapidly changing on and off. The next question is what might be causing this - it might be the K3, but it also could be upstream, in Fred’s Signalink or perhaps the computer / program that is feeding audio to the radio system.
With that in mind, and knowing the calibre of folks on the list who are very adept at digital setups, let's see if we can troubleshoot the system and get Fred going again the way things should be. 73! Jack, W6FB > On Jul 1, 2019, at 7:32 PM, Bob McGraw K4TAX <rmcg...@blomand.net> wrote: > > Sounds like the power from the K3 is too high. Should be about 25 or so > watts. Actually, 20 watts drives my KPA500 to 500 watts output on all bands. > I trust the SWR as seen by the amplifier is 1.5:1 or less. > > Do you get any FAULT LED indications on the KPA500? You can use the KPA500 > Utility to download and examine the fault table. > > 73 > > Bob, K4TAX > > > On 7/1/2019 8:05 PM, Fred wrote: >> Hi, >> >> I have a K3, P3, KPA500, KAT500 and a SignaLink for sound. Sometimes when >> I transmit on FT8 running full power on the KPA500, the KPA500 will click >> on/off. The power doesn't turn on/off, it seems like a relay inside. The >> power meter will go to about 500 watts, then down to 0, then to abut 500 >> watts...and down to 0 maybe once a second. I have a short video I can send >> if someone would like to see it. When I bypass the KPA500 and use 50 watts >> or so just on the K3, no issues. >> >> Please let me know if you have any questions. >> >> 73, Fred >> >> KD8ZYD > > ______________________________________________________________ > 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 jackbrin...@me.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
