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WSPR beacon done in software using a GPIO pin on the Raspberry Pi.
to amateur arm beacon radio raspberry-pi wspr ... on 24 March 2013
WSPR beacon using a Raspberry Pi's GPIOs.
to radio raspberry-pi software wspr ... on 19 March 2013
Whistable-based radio enthusiast. The section on his LF gear is interesting -- using an audio amplifier as a PA.
Technical Inforamation - Active Antenna Amplifier Ham Kit
Kit version of LZ1AQ's active antenna design, for both loops and dipoles (or two loops used as a dipole!). Neat.
to active antenna electronics radio ... on 18 March 2013
BBC RD - Publications - White Paper 132 : Dipole Antennas
Excellent overview of dipoles and variations thereof (folded dipoles, cones, discones, etc.).
to antenna dipole electronics hf radio vhf ... on 08 March 2013
An assortment of radio boards for use with Arduinos, Raspberry Pis and the like. They're based on the CC110x chips so they're pretty flexible (e.g. they do one with a built-in USB controller, and an Arduino clone that uses that to do the USB serial port).
to arduino embedded microcontroller radio raspberry-pi ... on 28 February 2013
Digital voice mode based on codec2. Must have a play with this at some point, although I think the chances of me hearing anything are slim...
RDS decoder. In Perl. Obviously. Hooking this up to gqrx or similar would be an interesting project.
Peaberry SDR Kit - $129.00 : AE9RB
Effectively a Softrock RXTX with an onboard USB soundcard -- might be handy for laptop use.
to electronics radio sdr shopping softrock ... on 29 December 2012
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tasty by Adam Sampson.