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Raspberry Pi as an FM transmitter with zero external components (2 replies)
The Raspberry Pi will also work as a SSB or WSPR transmitter across that frequency range, see
73 Trevor M5AKA
Very cool... Also just found this article on using the camera module as an SSTV beacon: https://blog.adafruit.com/2014/04/18/how-to-use-the-raspberry-pi-as-a-slow-scan-television-sstv-camera/
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Just spotted this page and code which uses the Raspberry Pi as an FM transmitter — the only external component needed is a wire for the aerial.
http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter
"It will work from about 1Mhz up to 250Mhz" — certainly worth investigating for the amateur bands.