Hi all,

I'm testing the 1.7A Beta Release on Windows 11 with a CM108 based sound card. For some reason when Dire Wolf receives, the output volume? of the CM108 reduces. On longer packets it reduces to zero and mutes itself.

I've looked in various settings, made sure no other programs are interacting with the sound interface etc etc but can't get to the bottom of it.

One observation is Windows has marked the CM108 as a "communications" device. There is a related setting buried in Windows to reduce the main volume when a communications device is in use, but I've disabled it and there's no change.

Has anyone seem something similar?

?

Thanks

Matthew

2E0SIP

Hi Matthew,

This is a somewhat common issue when using C-Media CM-108/109/119 based USB sound fobs/dongles. Some of the instructions (especially those for Allstar Nodes) for using C-Media chips as your radio interface include connections to the "volume up" (CTCSS) and "volume down" (Squelch / COS) inputs of the chip.

Depending on your intended use, those connections can be problematic because by default they will result in changes to the audio volume.

In many cases the only connections between the radio and the C-Media sound chip should be:
PTT (typically coming from GPIO #3 on pin 13)
Microphone Audio-In
Speaker Audio-Out
Ground.

73,
Thomas
KK6FPP

Hi Thomas,

Of course, that makes total sense. This sound card has COS hooked up to VOL DN. I'd rather not modify the sound card but I should be able to disable the COS output on the radio.

Thanks

That is 'THE" most likely the cause and if you can disable the COS on the radio, it should solve the problem.
However, I will add one additional comment.? With Windows 10 and even more so with Windows 11, the "communication device" is often used for computer and computer-to-computer actions.
? ?Some of these applications don't show in the normal checks for applications that may be using the sound card.
? ?Also, there are times when Microsoft 'decides' to act on these devices - such as reduce background noise (prevent from sending to others).
? ?Double check the AGC setting (Sound settings for the USB device) - just to be sure.

Better yet, if you can - select something else as the communication device.? Unfortunately, I have not found a way to have that set to "none".
If your HDMI monitor doesn't have speakers, that is a great choice for one of the default that you don't want.
-------
Rob KB8RCO

Are you talking about DINAH?

If so, you need to cut jumper JP3.? It is mentioned in the second paragraph of the Overview section in ? and a couple times in?? .

Rob makes a very interesting observation.? If the operating system does some fancy audio processing to separate voice from other "noise" it would be most unfortunate for our application.?

73,
John WB2OSZ

开云体育

Hello Matthew,

Which CM108-based device are you using?

--David
KI6ZHD

On Wed, Apr 5, 2023 at 10:12 AM, WB2OSZ wrote:

Rob makes a very interesting observation.? If the operating system does some fancy audio processing to separate voice from other "noise" it would be most unfortunate for our application.?

I have only seen this happen on the "communication device" with VOICE command active for microphone activity.
But I assume it may have similar capability on the speaker side.?
? ? Also, some devices have AGC for outputs - I think the speaker output was the issue.
I am not sure why the receive signal would mess with the sound card output volume - other than the COS.

?-------
Rob KB8RCO

Hi All,

Its a custom modified cm108 originally built for AllStar