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 <rmcg...@blomand.net> 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 <va...@portcredit.net> 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 < > elecraft@mailman.qth.net> 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: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
