[Elecraft] K3s USB audio problem; both channels identical

[Rich]

As a side note........

This problem usually is caused by the Windows updates.   The update will 
change the audio codecs in your Windows Sound system.

So check the settings after an update to make sure Windows did not 
change them again.

It has happened to me more than times than I care to remember after a 
Win10 update

Rich

On 2/20/2021 10:30 AM, hdv at kpnplanet.nl wrote:
> It was a Windows 10 problem after all.
>
> I did a complete new WIN10 install on a 3rd PC, just to be sure I was not
> taken things for granted.
>
>   
>
> Presto. All was working OK now.
>
> Two instances of MSHV are both running, while on a separate USB audio
> channel.
>
> I clearly see the spectrum differences of MAIN and SUB in the waterfall.
>
>   
>
> So now I have to figure out what went wrong and why. (and why 2 PC's fooled
> me in the first place.)
>
>   
>
> Sorry for the bandwidth, disregard my previous mail.
>
>   
>
> 73 Henk
>
> PA0C
>
>   
>
>   
>
> Van: hdv at kpnplanet.nl <hdv at kpnplanet.nl>
> Verzonden: zaterdag 20 februari 2021 11:45
> Aan: 'elecraft at mailman.qth.net' <elecraft at mailman.qth.net>
> Onderwerp: 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.
>
>
>