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freedvtnc2/sBitx_Setup.md
smeshT abf4d576d4 fixed a typo in sBitx_Setup.md
2026-04-30 22:34:47 -06:00

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sBitx Setup

Determine Audio Device

  • first determine the audio devices for input and output; bash freedvtnc2 --list-audio-devices in an sBitx terminal
  • Should print something like this at the end
Id  Name                      In    Out    SampleRate
0  Loopback: PCM (hw:1,0)    32     32         44100
1  Loopback: PCM (hw:1,1)     2     32         48000
2  Loopback: PCM (hw:2,0)    32      2         48000
3  Loopback: PCM (hw:2,1)    32     32         44100
4  Loopback: PCM (hw:3,0)    32     32         44100
5  Loopback: PCM (hw:3,1)    32     32         44100
6  pipewire                  64     64         44100
7  pulse                     32     32         44100
8  default                   64     64         44100
  • On the machine above the Input device is the one that shows 2 under In and the output shows 2 under Out
  • The Id numbers are used to call the device
  • To use Loopback: PCM (hw:1,1) as the input device as a command line option --input-device 1
  • For config files input-device =1 no spaces after =

Run from Command Line

  1. To start the application by specifying the options from command line,
freedvtnc2 --input-device 1 --output-device 2 --callsign NOCALL --mode DATAC4

replacing 1 and 2 with the devices you found above on your machine.

Run from config file

  1. Check for config file, in the sBitx terminal bash nano .freedvtnc2.conf If the file is blank exit nano ctrl + x
  • bash freedvtnc2 to start the application
  • In the application command line type save_config This wiil auto generate a nearly working config file. freedvtnc2 will not be able to start from this config, you will get an error that the audio device cannot be found
  • sBtix terminal again bash nano .freedvtnc2 to open the config file. It will look something like this
no-cli = False
list-audio-devices = False
log-level = INFO
input-device = 
output-device = 
output-volume = 0.0
mode = DATAC4
follow = False
max-packets-combined = 5
pts = False
kiss-tcp-port = 8001
kiss-tcp-address = 127.0.0.1
rigctld-port = 4532
rigctld-host = localhost
ptt-on-delay-ms = 100
ptt-off-delay-ms = 100
callsign =
  • Scroll down to input-device = and add the audio device Id right next to the =, no spaces.
  • Repeat for output-device =
  • It should look like this, again no spaces after the =
input-device =1
output-device =2
  • Change mode and add callsign if desired (this can be done inside the app as well)