As a quick followup to my previous post, I confirm that the R820T is well suited for GPS
signal decoding. I was not expecting the huge frequency offset (> 100 kHz at 1.57 GHz) and
was not searching far enough from the expected carrier frequency during the acquisition phase.
However these results were acquired by runnig rtl_sdr -s ... -f ... while gnuradio-companion
running gr-osmosdr is unable to lock at 1.57 GHz and barely locks (for a few seconds !) at
1.56 GHz. I have analyzed the various version of librtlsdr (used by rtl_sdr and by gr-oscmocom)
as well as the set_frequency functions and am unable to track any difference between the two
codes (so far).
JM
--
JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 32 av. observatoire, 25044 Besancon, France
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