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Some useful notes on the Baofeng/Wouxun cheapie handhelds, but the rest of this is also quite interesting, particularly the repairs to test equipment. (I need to keep an eye out for one of those HP spectrum analysers...)
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
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tasty by Adam Sampson.