Sometimes hum will be induced from transformers in the vicinity. Run the K3 on a card table by itself and see if the hum follows you.
73, Guy. On Sun, May 16, 2010 at 12:16 PM, Karl Marderian <[email protected]> wrote: > Bad power supplies, check for hum from them. Ground radio and/or power > supplies. The A/C hum has to come from the wall supply. > That's my two cents, good luck. > N6XVT 73 > > Sent from my iPhone > > On May 16, 2010, at 8:43 AM, Sam Morgan <[email protected]> wrote: > >> This one is a bit hard to describe, so please bare with me. >> >> I was talking to some locals (1-5 miles) this morning on 80m LSB. >> I was told that when I was tuning up a hum was heard on my signal >> by the guys, which were in LSB on their receivers >> >> I tried with low power 1w >> I tried with higher power 90w >> I tried it through the external amp >> I tried it with the external amp off >> I tried it direct to the antenna >> I unplugged everything from the K3 but the power and antenna >> I have switched power supplies, >> I have switched AC outlets in the room. >> >> They say they still hear the hum. >> >> I switched to cw and >> when they were still listening in LSB, >> they still heard the hum on my cw signal. >> >> IF they switch to cw on their rigs, >> they do NOT hear any hum on my cw signals. >> >> what in the world is going on here? >> do I have a problem or not? >> -- >> GB & 73 >> K5OAI >> Sam Morgan >> ______________________________________________________________ >> 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 > ______________________________________________________________ > 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 > ______________________________________________________________ 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
