From Newsgroup: alt.ham-radio
Using minimodem on macOS I'm trying to recreate this just to see how
much I can save on a C60 cassette. I'm aware of the kansas city
standard - I'm not using that because I can't find anything modern that
will support it.
minimodem is for HAM radio, but I have had good luck recording data at
2400 baud. I wondr if I can go faster.
cat file.txt | minimodem -t 2400 -f file.txt.wav or flac
produces a sound file that i record to tape. Then I play back the tape
and capture the audio via a line-in or aux cable to another wav.
minimodem -r 2400 -f file.txt.wav > out.txt
My results were inconsistent. Sometimes I was able to get the original
data file from the audio file capturtes from the analog source -
sometimes I wasn't.
Then I discovered it wasn't hot enough. I used Audacity's amplify
effect and was able to successfully decode the original file from the
analog capture at 1200 baud. Then I went to bed.
I need to increase the volume from the cassette player to the laptop.
I think 2400 baud might actually be possible at this point.
https://imgur.com/WE9MVQJ
minimodem isn't on macports, only via Homebrew.
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