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]
