[Elecraft] K3s USB audio problem; both channels identical

[Joe Subich, W4TV]

> I found out that I lost the audio of the MAIN RX on the USB port of
> my K3s

Thank Microsoft!

In Windows Sound Control Panel (You may need to access it via
Settings -> System -> Sound -> Related Settings)

Select the Recording tab
Select (double click) Line for USB Audio CODEC in the K3
Select the *Advanced* tab
Set the Default Format to "2 channel, 16 bit, 48000 Hz"
     (48 KHz is required for digital applications like WSJTX)
Click "Apply"

73,

    ... Joe, W4TV


On 2021-02-20 5:45 AM, hdv at kpnplanet.nl wrote:
> 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.
> 
> 
>