Concerning the B issue, may be you could synchronize the input sample stream using an external reference pulse received by both sticks at the same time?
Best, Rafael Diniz > On 08/23/2012 05:51 PM, Alberto Trentadue wrote: >> Hello >> >> I am considering using 2 RTL SDR compliant dongles + GRC for some simple >> interferometric application. >> Having two >> of such dongles, does anybody know if it is possible to have both >> running as GRC sources? >> If not, would it be possible >> in theory (to be developed) or there is a strict architectural reason >> preventing this? >> >> Thanks in advance >> Alberto >> >> > Assuming that you're using the gr-osmosdr source block, you can specify > multiple devices: > > rtl=0 > rtl=1 > > And so on. > > But be aware, there's no way to identify a "specific" RTL device -- > those numbers just mean "the first one that enumerated this time, > the second one that enumerated, etc". For you application it may not > matter whether you know on any given run which one is > which. > > Also, unless you can find a way to: > > (A) Synchronize the reference clocks for the two RTL-SDR dongles > (relatively easy using a shared 28.8MHz oscillator) > (B) Synchronize the sample stream (HARD!) > > You aren't going to have much fun with interferometry. > > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
