Hello Jim,

i have installed direwolf on a Raspbeery Pi 4? direwolf opens without any errors.

I am not decoding any packets.? I can hear them on another radio.

unfortunately i don't have a APRS capable radio yet so i am limited to hearing packets from Beacons of other stations??

The audio source is a Kenwood TM261 via the external speaker jack.

Below is the information from my setup.? What am I missing?

What sound device are you using on your Raspberry Pi to "hear" the Kenwood TM261's audio?? Are you sure it's wired up correctly?

Dire Wolf version 1.7

Includes optional support for: ?cm108-ptt

Reading config file direwolf.conf
Audio device for both receive and transmit: plughw:3,0 ?(channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, A+, 44100 sample rate.
Note: PTT not configured for channel 0. (Ignore this if using VOX.)

Not having PTT configured for a receive only setup is fine for now

(open squelch)

ADEVICE0: Sample rate approx. 44.2 k, 0 errors, receive audio level CH0 24
ADEVICE0: Sample rate approx. 44.1 k, 0 errors, receive audio level CH0 23

from direwolf.conf

Your audio level seems a little low (ideal is an average open squelch level of 50) but the more concerning issue is the slight changes in the sampling rate.? How your sound device connected to your Raspberry Pi??
?? - Directly connected via a USB2.0 port (black connector)
?? - Connected via an external USB hub that is connected to a Rpi4 USB2.0 port (black connector)

?? - Directly connected via a USB3.0 port (blue connector)
?? - Connected via an external USB hub that is connected to a Rpi4 USB3.0 port (blue connector)

?? - Maybe your sound device is something like a Fe-Pi or some other Raspberry Pi HAT board using one of the built-in I2S channels?


What else is your Raspberry Pi doing while you're also running Direwolf?

ADEVICE ?plughw:3,0

That seems like a rather high number.? Please send us the output of "aplay -l" from a terminal window on your Raspberry Pi

--David
KI6ZHD

On Mar 11, 2025, at 12:46?PM, N0XMZ - Scott Moore <scott@...> wrote:

?

Check that the mic input to the pi isn't muted.

alsamixer

Select your sound card and check the mic volume. They often default to Mute with a little "M" at the bottom of the graphic. Tab to it and arrow up to increase volume. Just don't go too high. About 20 is good.

On Tue, 2025-03-11 at 09:32 -0700, David Ranch via groups.io wrote:

Hello Jim,

i have installed direwolf on a Raspbeery Pi 4? direwolf opens without any errors.

I am not decoding any packets.? I can hear them on another radio.

unfortunately i don't have a APRS capable radio yet so i am limited to hearing packets from Beacons of other stations??

The audio source is a Kenwood TM261 via the external speaker jack.

Below is the information from my setup.? What am I missing?

What sound device are you using on your Raspberry Pi to "hear" the Kenwood TM261's audio?? Are you sure it's wired up correctly?

Dire Wolf version 1.7

Includes optional support for: ?cm108-ptt

Reading config file direwolf.conf
Audio device for both receive and transmit: plughw:3,0 ?(channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, A+, 44100 sample rate.
Note: PTT not configured for channel 0. (Ignore this if using VOX.)

Not having PTT configured for a receive only setup is fine for now

(open squelch)

ADEVICE0: Sample rate approx. 44.2 k, 0 errors, receive audio level CH0 24
ADEVICE0: Sample rate approx. 44.1 k, 0 errors, receive audio level CH0 23

from direwolf.conf

Your audio level seems a little low (ideal is an average open squelch level of 50) but the more concerning issue is the slight changes in the sampling rate.? How your sound device connected to your Raspberry Pi??
?? - Directly connected via a USB2.0 port (black connector)
?? - Connected via an external USB hub that is connected to a Rpi4 USB2.0 port (black connector)

?? - Directly connected via a USB3.0 port (blue connector)
?? - Connected via an external USB hub that is connected to a Rpi4 USB3.0 port (blue connector)

?? - Maybe your sound device is something like a Fe-Pi or some other Raspberry Pi HAT board using one of the built-in I2S channels?


What else is your Raspberry Pi doing while you're also running Direwolf?

ADEVICE ?plughw:3,0

That seems like a rather high number.? Please send us the output of "aplay -l" from a terminal window on your Raspberry Pi

--David
KI6ZHD

Hi Jim,

This may not be what you want to hear, but decoding after increasing the speaker volume on the radio does not necessarily mean that all is well.

Microphone inputs are sensitive and I often see Direwolf decoding packets with nothing at all connected to the audio in/out connectors, especially when the radio speaker volume is high.

I don't know the exact reason, but the most likely explanation is that small amounts of the audio volume are carried across common grounds between the radio and computer. 

When using the speaker output of a radio, clearly Direwolf won't be able to receive/decode anything if the radio volume is completely off. However even a small volume is more than enough assuming the proper connections are in place (both in terms of physical wiring and in audio software configuration).

If you have to turn up the volume on the radio significantly, something is wrong (even if it appears to "work").

73,
Thomas
KK6FPP

P.S.: In some (rare) cases when connecting to the speaker output care must be taken because the sleeve isn't connected to ground (which it normally is). I did check the service manual and the Kenwood TM-261A is not one of those radios. In the TM-261A the sleeve of the speaker jack is connected to ground as one generally expects).