I use R820T. It has nonzero IF and the noise is relatively flat. The clock looks sawtooth-like on the scope.
Juha On 26.9.2013, at 18.32, Heath Hunnicutt <heath.hunnic...@gmail.com> wrote: > Juha, > > Ordinarily, I would choose to feed a clock into xtal_in, this seems logical. > However check out the Elonics patent: > > http://www.uspto.gov/web/patents/patog/week49/OG/html/1385-1/US08324978-20121204.html > > The main thing to note is that square-wave clock input should be fed to > xtal_in for the elonics chip. > > If you read that patent, it may give you some ideas about feeding a clock to > xtal_in of other chips. Maybe other chips will also expect a sawtooth in > the linear region of voltage swing, not rail-to-rail square wave. Note the > comments in that patent on jitter at square wave, etc., > > Nobody on this thread has stated whether they are using e4000 or r820. That > would probably be helpful. > > > > > -- > View this message in context: > http://gnuradio.4.n7.nabble.com/dual-coherent-channel-rtl-sdr-tp43784p43851.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > _______________________________________________ > 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