I'd posted before about SDR, and have tried PiFM. Why not put them together? Apparently someone has done it, based on an article on Hackaday linking to a post on some guy's blog. He uses it to transmit data at about 9600 baud. I'm more interested in using this to transmit voice: basically getting a huge transmit range relative to normal HTs for a fraction of the cost! The RPi is $35; the SDR dongle, $10; a small LCD display, $20; some filtering hardware and wire for the transmitter, $5; you'd need a USB mic and a LiPo battery to complete the setup. Well, I've read that SDR hogs power, but even so, this could be really cool...!
I almost forgot, there's a TNC kit for the RPi available as well. Although if the receiver's digital, that'd be unnecessary.
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