Cool. I wrote up a few blog posts about the tests I did this week:
http://kaira.sgo.fi/2013/09/16-dual-channel-coherent-digital.html http://kaira.sgo.fi/2013/09/passive-radar-with-16-dual-coherent.html PS. I tried adding a third dongle to run with the same master clock. I didn't do it correctly this time either by using an active signal splitter, as that would increase the total cost :). I'll hopefully have some more to report next week. juha On Fri, Sep 27, 2013 at 2:16 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > On 09/26/2013 11:27 PM, Jared Clements wrote: > >> >> Since they're clocked together I would assume that your alignment would >> consist of interpolation on the primary FM signal, what do you do to remove >> it later? If your code is too messy to release can you share a block >> diagram? >> >> Thanks, >> >> Jared >> >> >> I just re-did my tests with a pair of synched dongles, and instead of > inject RF externally, I just tuned it close to the 2nd harmonic of the > clock. > > That produced quite stable, near-perfect, correlation, once I adjusted the > phase to peak up the correlator output. This puzzles me greatly. > > This implies that both dongles are properly phase-locked to the master > clock, and that the leakage is being coherently downconverted, and > that no samples are being dropped. > > So, my phase-coherence issues are with my external RF injection. Which I > just plain don't understand.... > > > -- > 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<https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >
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