I also had a hum caused when my SIgnalink device was connected to the computer but NOT powered on.
Eric - WB7SDE On Thu, Oct 23, 2014, at 11:01 AM, Bill Breeden wrote: > > I noticed an AC hum in the monitor audio in my headphones while calling > with one of the W1AW portables. While wondering if the hum was really > in my transmit audio, the W1AW Operator came back to me and reported the > hum. I use a Heil Proset K2/K3 via the front panel microphone connector > through a Kenwood style (red band) Heil pigtail. After completing the > QSO I switched to Test mode and I could still hear the hum when I > transmitted. Thinking I had a poor connection, I disconnected and > reconnected both ends of the pigtail, but the hum persisted. While > doing that I noticed there was no hum if I activated the push to talk > with microphone unplugged from the pigtail. That had me baffled for a > few moments until I remembered that the Proset K2/K3 requires bias > voltage from the K3. At that point I used the "2" button in the "MIC > SEL" menu to turn the bias off and on a few times and the hum was > disappeared. I haven't researched the details of the bias switching > arrangement in the K3 but it appears that mine needed some exercise to > clear a bad connection. I thought I would pass this on to the rest of > the group in case someone else encounters this issue. > > 73, > > Bill - NA5DX > > ______________________________________________________________ > 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 e...@evross.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
