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


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