Hi All, Thanks for your suggestions and for the interesting discussion. To close the loop, here's some information about the solution, which I discovered by accident:
More careful sleuthing showed that the issue was in the computer audio chain (as I suspected) and not with the K3. The artefact was present on the soundcard audio output. I tried another, older, laptop running XP, and with the same USB Soundcard dongle connected and all other parameters unchanged, and this time the problem was absent. I then went back to the original laptop (running Win 7) and ran the latency checker application. All green bars, which didn't help me much. I'm not sure why, but I then decided to disable the computer's internal sound card through device manager. I had muted the mic input of the internal sound card earlier, but hadn't disabled it. Anyway, after that, the problem is fixed. So, using the USB soundcard dongle with the internal soundcard disabled, the pops and clicks are gone. I should explain that I need to use the dongle because this computer's own soundcard has no line or mic in jack - it has an inbuilt mic, but no way of routing an external audio source to the internal soundcard. Thanks again to everyone for your suggestions, on and off the list. 73, John VK7JB -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Data-mode-TX-problem-from-VK7JB-tp6787469p6791888.html Sent from the Elecraft mailing list archive at Nabble.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
