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AFSK – Bell 202 Audio Frequency Shift Keying encoder

Project description

Generates Bell 202 AFSK audio samples and AFSK encoded APRS/AX.25 packets.


Change to the afsk directory and install with:

$ pip install -r requirements.txt
$ pip install .

Requires Python 2.6 or 2.7.

If you don’t need soundcard playback, the PyAudio dependency is optional. Comment it out of the requirements.txt file before installing.

You can still use the CLI program with the -o option to output to a Wave file.

Command Line Interface

Generate APRS messages with the aprs CLI program:

$ aprs --callsign <your callsign> ":EMAIL Test email"

Specify your message body with INFO command line argument. Be sure to wrap the message in quotes so it’s passed as one argument, spaces includd.

At the moment, no message formats are implemented in the aprs program; you must construct the body string yourself. For instance, in the example above, the string passed as an argument to aprs follows the email messsage format specified for APRS.

You must specify your amateur radio callsign with the --callsign or -c flags.

Use the --output option to write audio to a Wave file (use ‘-‘ for STDOUT) rather than play over the soundcard.

Get a listing of other options with aprs --help.

Project details

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