SDR - RDA1846

[Bob Brown - WØNQX]

Swiped from another list.....this is an interesting concept......

We actually have a fairly good idea of how the Chinese radios (Baofeng and rebrands) work, thanks to a few people who decided to disassemble them, and some schematics that have been tossed around online. The "guts" of the transceiver is a RDA1846 chip; the datasheet and programming manual can be found online. See http://www.elazary.com/index.php?view=category&id=14%3Abaofeng-uv5r&option=com_content&Itemid=17 by kk6bwa (who might be lurking here?) for some good writeups. At least for the UV-3R, he was able to flash his own firmware onto the MCU (which is also an off-the-shelf part, and only has 16k of space). On the UV-5r, once he toggled off the pre/de-emph and the low/highpass filters, he was able to use kristoff's 4800 GMSK modem to successfully send data. (As Matthew plans to do)

Also, I read a rumor that Baofeng is willing to produce customized versions of these radios for sufficiently large orders, though I don't know to what extent they could be customized and I don't know what the order size would be (and I don't know it to be true...). But something to keep in mind.

--Reuven (KB3EHW)

EOM

/NNNN

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Thanks in Advance

   Bob Brown, WØNQX

   Kansas City Metro Area
   

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