On Thu, Sep 12, 2013 at 11:47 PM, Matthieu Tourne <matthieu.tourne(a)gmail.com > Hi! > > > On Thu, Sep 12, 2013 at 7:33 PM, Marc Juul <juul(a)labitat.dk> >> Hi! >> >> Some of us at sudo room / east bay mesh are working on a low bandwidth >> disaster recovery mesh project based on software defined radios. >> >> We're prototyping with a combination of USRP1 and RTL-SDR devices and GNU >> Radio. >> >> We're having some issues getting the receivers to demodulate our data >> streams (using DQPSK and QAM modulation). >> >> > I never thought about doing much more than tuning to FM radios with my > rtl-sdr, but that's a pretty cool project! > > Thanks! You should come hack with us! The RTL-SDR is definitely not a high quality SDR, but we have very low bandwidth requirements. For the transmitters we're only using USRPs while prototyping. We're also working on a cheap transmit-only SDR circuit, but that is definitely a longer term project and for now we just want a full functioning prototype. That's lower cost than the USRP, but still more expensive than we'd like. I hadn't actually considered using the built-in de-modulation :-S I'll look into that. Interesting. Thanks for all the links!