[Elecraft] K3 Switches Number of Speakers

[Chester Latawiec]

Yes.  I've noticed that as well, in that it occurred when a loud signal popped into the passband!  My AGC is always on with the affected K3.

That makes two of us.

So I now suspect that there is a common menu setting or front panel setting or firmware setting that is causing this.  I was afraid my vintage K3 was dying!


73

Chet VE3CFK


________________________________
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> on behalf of Mike Cox <mike at ab9v.us>
Sent: January 30, 2018 12:32 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Switches Number of Speakers

My k3s occasionally does this too. I finally isolated the problem
initiator as a burst of very loud signals, such as occurs when listening
to a very weak DX station when a very strong (speaker rattling) station
plops on top of him followed by the loud frequency cops. The Sub Rx must
be is on and the volume for Main Rx is cranked up for the weak station.
A single loud signal does not appear to initiate the SPKRS parameter
change. It appears to only happen with multiple loud signals in the
passband. These signals will be loud enough that I turn down the volume
very quickly. During this loud outburst, the SPKR config will change to
"1". I have set up a macro button to toggle the SPKRS configuration so
that I can quickly return it to "2". If I turn the volume down a bit, it
doesn't do this so I'm wondering if there's some "safety" mechanism
built into the audio driver control circuit/firmware. Is it due to
mixing of close frequency audio signals in a non-linear audio amp
(clipping mode) producing sub-audible products? I don't know, it's just
a thought. It's only an occasional annoyance for me so I've never
pursued a cure.

My AF LIM parameter is currently set at 30 but I seldom have AGC off. It
does it with AF GAIN "HI" or "LO" but if the gain is set "LO", I must
turn the volume knob up more to compensate so I end up listening at the
same relative audio levels. I'm running LP Bridge and at least one
logging program and a K-Pod but have no other macros that directly deal
with the SPKRS parameters. My sub Rx card is an older version retrieved
from my original K3.

A cure or a work-around would be nice,

Mike, AB9V


On 1/30/2018 11:21 AM, Chester Latawiec wrote:
> My old K3 occasionally switches from 2 speakers to 1 speaker (makes it really tough to listen split chasing DX)!
>
>
> Any ideas what may be causing this?
>
>
> 73
>
> Chet VE3CFK
>
>
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