[Elecraft] K4 observation

[Paul Van Dyke]

John

Would you put that under "Worked All Molars?"

Paul KB9AVO

On Fri, Jun 18, 2021, 10:35 PM Wayne Burdick <n6kr at elecraft.com> 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 <johnae5x at gmail.com> 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.
> > ______________________________________________________________
>
>
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