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11 November 2016 @ 10:34 pm
11 Nov '16  
More good meetings. Little else accomplished.

Anybody know much about radio transmission of digital data? Specifically encoding text as audio for transmission over cheap handhelds. All the ham software I find is kinda... horrible to use, to say nothing of entirely GUI based and often windows-only. `minimodem` looked good for a while, but we need better modes, in order to get decent speed while handling noise issues. Can't take 8 minutes to transmit a 1kb message. fldigi is the only thing I've really found so far and it is painful to use. Plus what I really want is a command line tool. Preferably one I can run on a raspi or similar.
sprockets, sockets, grommets & gasketsrandomdreams on November 12th, 2016 06:49 am (UTC)
I will ask my radio/ham friends. neuro might have some ideas.
sistawendy on November 12th, 2016 03:24 pm (UTC)
I suspect you're going to bump up against the Shannon limit and the limited bandwidth available to amateurs. I know packet data is a thing, but when last I heard it used early dial-up modem speeds.
eub on November 14th, 2016 10:24 am (UTC)
Though hmm "8 minutes to transmit a 1kb message" is 17 bits/sec, which seems poor, for even any bandwidth enough to give a crappy voice transmission... well, with enough noise getting in the way, it can take an unboundedly long time.