[Elecraft] K3s USB audio problem; both channels identical

[Jim Cassidy]

wills

----- Original Message -----
From: hdv at kpnplanet.nl
To: "Elecraft" <elecraft at mailman.qth.net>
Sent: Saturday, February 20, 2021 2:45:16 AM
Subject: [Elecraft] K3s USB audio problem; both channels identical

Hi Elecrafters,

 

I found out that I lost the audio of the MAIN RX on the USB port of my K3s
(with SUB RX  installed)

On all other audio outputs (speaker, headphone, line-out) MAIN and SUB audio
are present.

On the USB port the Right and Left audio stream are identical. (so both L
and R is MAIN audio now)

 

I did check on new firmware and I did an MCU LD with all the latest versions
available. (which were already loaded anyway)

The USB problem was still there.

 

Once again an MCU LD.

The audio via USB is still only MAIN (at both channels), no SUB audio.

 

An EE INIT with some older configurations.

This should not have any impact and it didn't; no change.

 

CAT is working OK via USB. 

Different cables make no difference (as expected).

Changing L-MIX-R to different settings makes no difference (as expected)

 

Besides USB, power and antenna nothing else is connected to the K3s.

 

After some K3s power cycles the reverse is now happening.

USB audio is only SUB audio (both R and L channel) and no MAIN audio is
present

The rest of the audio outputs remains OK.

 

I did check USB audio on 2 different PC's (both WIN10) with various audio
programs which are using Right and/or Left channel audio input (WSJT-X,
MSHV, Visual Analyser).

All have the same issue. 

Windows 10 settings are OK, mic. input is set for 2 channels.

There are no other programs running, requiring audio input.

 

Visual examination of the KIO3B boards revealed nothing.

 

Anyone with some bright ideas that could help me out?

 

73 Henk

PA0C

 

PS: I did sent a mail to Elecraft support, but hope to get some feedback
from this group as well.



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