Actually, it could be a radio station. I haven’t listened long enough to ascertain…
Frankly, I don’t care! The bigger problem is the rfi when I transmit. Tom W4KX Sent from my iPad > On Jun 18, 2021, at 11:10 PM, w2xj <[email protected]> wrote: > > > Wayne > > I seriously doubt this is an RF issue. TV is all digital and has no discrete > audio carrier. TV RF interference would sound like white noise. This sounds > more like an audio ground loop of some sort. > > > > >> On June 18, 2021 10:33 PM Wayne Burdick <[email protected]> wrote: >> >> >> John, >> >> If the K4 is *off*, then there's no active circuitry involved. However, the >> headphone plug-insertion detect circuit may involve an IC downstream that >> could include a schottky diode junction -- a potential way a very strong >> signal could be rectified right at the radio end of the cable. We're looking >> at that. >> >> If the cable is not very well shielded, and the TV station is *very strong*, >> I can imagine modern physics just barely covering this situation. It would >> help if the headphone cable was about the length of an end-fed dipole at the >> station's frequency. >> >> As for the K4 chassis itself: It's very well sealed (far better than the >> K3/K3S). >> >> Wayne >> N6KR >> >> >> >>>> On Jun 18, 2021, at 3:36 PM, John Harper <[email protected]> wrote: >>> >>> https://www.youtube.com/watch?v=u1XRaNpgQDI >>> >>> John AE5X >>> https://ae5x.blogspot.com >>> >>>> Noticed that when the antenna are disconnected, and the K4 turned off, I >>>> hear a local TV station in the headphones… Never happened on the K3. >>> ______________________________________________________________ >> >> >> ______________________________________________________________ >> 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] ______________________________________________________________ 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]
