DVB-T
Tuner Module Reference Design:Application
Note(PDF)
Kit x 1
Document:Include Datasheet, Reference Schematic, Gerber
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It says I2C bus on the R820T datasheet you linked to. So my guess is, you'd need to sniff the I2C bus, run the regular application at a known frequency, do some serious reverse engineering of their protocol to the tuner, add bits into existing e4000 code, test and see if it works. (R820T is just the tuner and not the ADC/USB/etc, so most of the work should already be done for you in the RTL2832U code.) Good luck! If you had the evaluation kit, this would probably help 1,000% if you sent it to the appropriate developer. (Not me, I'm just an armchair SDR-er.) Even without an evaluation kit though, its just a matter of time before the R820T is figured out.
linagee