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Minima -A general coverage transceiver edit / delete
From the designer of the BITX transceiver: a multiband SSB radio built from common parts with clever use of a microcontroller. The mixer design is particularly neat.
to amateur amplifier electronics hf lpf microcontroller mixer radio ssb transceiver ... on 22 March 2015
Filters - OpenRadioMiniconf edit / delete
Building HF transmitter filters using air-cored coils, wound on a pencil. This is surprisingly effective!
to amateur coil electronics filter hf inductor lpf radio transmitter ... on 14 March 2015
HellZXcreiber • Hackaday Projects edit / delete
Hellschreiber receiver for the Spectrum, using the tape interface. Presumably you could do a transmitter as well with minimal hardware...
to amateur hellschreiber radio retrocomputing sinclair spectrum ... on 27 April 2014
More specifically: reverse engineering the UV-3R and UV-5R. Apparently it's pretty easy to reprogram the 3R's microcontroller, and they're both based on an I2C-controlled single-chip transceiver, so are eminently suitable for rebuilding for other applications.
to amateur baofeng microcontroller radio reverse-engineering uv3r uv5r ... on 27 March 2013
windytan/slowrx · GitHub edit / delete
A new SSTV decoder. I should hook this up to my SDR stuff (which might mean adding JACK support).
to amateur radio software sstv to-package ... on 24 March 2013
threeme3/WsprryPi · GitHub edit / delete
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
Whistable-based radio enthusiast. The section on his LF gear is interesting -- using an audio amplifier as a PA.
New home of projects like Das DereLicht.
to amateur electronics radio retrotech surplus ... on 25 November 2012
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tasty by Adam Sampson.