[Elecraft] [K3] Strange Selective Hearing in My K3

[David Olean]

When the signals disappear, can you transmit and see RF output? You 
might be losing one of the regulated DC voltages from the three terminal 
regulators mounted on the side wall.  If you lose TX as well, check to 
make sure those regulators are working. It will affect all bands.

Dave K1WHS

On 10/9/2022 5:23 PM, Eric Fitzgerald wrote:
>    I supposed in any lengthy marriage a selective ear or a biological
>    mute button, so to speak, becomes inevitable ...or so it would
>    appear with my aging K3, purchased in 2009.
>
>    Here are the rather perplexing symptoms:
>
>    After the K3 has been on a while all signals and noise disappear.
>    The radios shows consistent s1 or 2 white noise. This is true on all
>    bands, all modes and with the preamp, agc, noiseblanker, etc on or
>    off. After turning the radio off for an hour or more, all signals
>    return as normal - only to disappear again after an indeterminate
>    period of time. I'm guessing that there is some failure that is
>    affected by the component in question heating up.  I use this radio
>    in receive almost 24/7 monitoring the bands. Perhaps she is just
>    tired of listening for me? ;-) Any ideas what this might be? Stupid
>    operator error is never out of the question around here.  I thought
>    I would ask in here before bugging Elecraft service in case I'm
>    missing something easy.
>
>    TIA
>
>    Eric KG6MZS
>
>    www.kg6mzs.com
>
> I should add that when I transmit a tone from WJST-X, say, the red 
> light comes on the K3, one bar lights up on the K3's RF meter but no 
> power or SWR is registered on my external meter.
>
> So that would seem to eliminate anything disconnected from the rear 
> panel connector via an intermittent connection.  If that were the 
> case, I would expect to see a "High SWR" reading before the power 
> folded back.
>
> Eric
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