Does it happen at 200 W? Sometimes RF in the shack shows up only at higher power levels.
wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jul 1, 2019, at 9:39 PM, Mark Goldberg <[email protected]> wrote: > > I'm going to take these two postings and suggest the possibility of RF > getting into the USB link to the PC causing it to drop samples. > > Check the grounds and make sure there is a good ground connection between > the PC, Signalink and the radio equipment. Try ferrite beads (Mix 31) on > the USB line or a different USB cable. > > 73, > > Mark > W7MLG > > > On Mon, Jul 1, 2019 at 9:06 PM Bob McGraw K4TAX <[email protected]> wrote: > >> A clue..... at 500 watts with the KPA500 there is an issue. At 50 watts >> using just the K3 there is no reported issue. What's the difference? >> RF field strength. Sounds like it might be and RFI issue. >> >> Check all PL-259's and make sure they are VERY TIGHT. Check jumper >> cables, between each piece of equipment and make sure they are in good >> condition and connectors are properly attached and installed. If in >> doubt, replace them. >> >> 73 >> >> Bob, K4TAX >> > > > > On Mon, Jul 1, 2019 at 8:41 PM Michael Walker <[email protected]> wrote: > >> Good to send the video >> >> It sounds like the Sound card is dropping audio frames then and can he test >> with WSJTx in their TUNE mode. Does the same thing happen. >> >> If it was me, I would review the sound card settings for the sound card >> device. Make sure it IS the one you think it is. >> >> Could the computer be suffering from high DPCs.. aka, is it busy doing >> something else like a virus scan or indexing? >> >> This is one of those times that it would be good to know more about the >> computer hardware, like CPU speed, memory, etc. >> >> Mike va3mw >> >> >> On Mon, Jul 1, 2019 at 11:15 PM Jack Brindle via Elecraft < >> [email protected]> wrote: >> >>> 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 > ______________________________________________________________ > 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]
