The challenge - I and many other users want to be able to use a headset for the phone modes in the sbitx e.g. USB headset or a Bluetooth headset.
Logically the problem is similar to the routing of audio for the digital modes from the audioinjectorpi sound card to/from the software used for the digital modes.
The soundcards identified in the sbitx using the command
aplay -l | awk -F \: '/,/{print $2}' | awk '{print $1}' | uniq?generates on the sbitx:
pi@sbitx:~ $ aplay -l | awk -F \: '/,/{print $2}' | awk '{print $1}' | uniq
audioinjectorpi
Loopback
Loopback_1
Loopback_2
pi@sbitx:~ $
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audioinjectorpi (card 0 in ./asoundrc) is the default output (and mic input) for the sbitx analogue audio
Loopback,DEV=1 (card 1 in ./asoundrc) is used for software output(Input) to JTDX, WSJT-X or others
Loopback_1,DEV=0 (card 2 in ./asoundrc) is used for Software input(Capture) from JTDX, WSJT-X or others
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Question - is Loopback_2 used by sbitx?
If yes, could we use this one to route analogue audio I/O from card 0 (audioinjectorpi) on SBITX to another audio I/O device such as a USB headset or Bluetooth headset?
After connecting my USB headset I ran the command again:
pi@sbitx:~ $ aplay -l | awk -F \: '/,/{print $2}' | awk '{print $1}' | uniq
audioinjectorpi
Loopback
Loopback_1
Loopback_2
II
pi@sbitx:~ $
the II shown in this command output is the USB Headset (Jabra Evolve 30 II in my case)
More detail re the ./asoundrc file:
The system configuration file is /etc/asound.conf (not exist on sbitx), and the per-user configuration file is ~/.asoundrc.
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sbitx asoundrc:
pi@sbitx:~ $ cat ~/.asoundrc
pcm.!default {
type asym
playback.pcm {
type plug
slave.pcm "output"
}
capture.pcm {
type plug
slave.pcm "input"
}
}
pcm.output {
type hw
card 0
}
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ctl.!default {
type hw
card 0
}
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pcm.input {
type hw
card 0
}
pi@sbitx:~ $?
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A couple of references:
These suggest it looks promising, the devil is in the detail
I am trying to avoid the use of PulseAudio as that has been replaced in newer distributions using Pipewire and Wireplumber, however both of these sit on top of ALSA. Based on this will focus my efforts on using Alsa if possible to minimise complication. Might not be possible but it is a starting point with help from the references above.
Research continues - if I get the answer and tested, it will be added here to begin with and then the wiki page as a Howto
If anyone already solved it then please add to the topic.
Regards
Paul G0KAO
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