try Keep N in M (keep 1 in N) for the "sampling".
However, if you correctly employ a PLL, your phase will be static;
if it's not, than the PLL is not doing it's job well.
On 10/22/2013 05:21 PM, Raydel Abreu (CM2ESP) wrote:
I am new to GNU Radio and I am still learning the
basic. I have a quick question. What blocks and
which way can I use in order to "sample" and know
the phase of a tuned carrier at regular intervals.
General idea: Let's suppose there is a carrier, after
applying proper tuning (Freq Xlating FIR Filter, etc),
I apply a PLL module (not sure which: PLL Carrier
Tracking or PLL Ref Out) in order to remove possible
drift from the receiver and output a steady carrier.
How can I sample at regular interval that corrected
carrier phase. Assuming that intervals are really
equals I guess every time I should obtain the same
I will really appreciate any help in this matter,
perhaps someone could point me in the right direction.
My purpose is to observe ionospheric phase scintillation
from a geostationary satellite beacon, which outputs a
steady carrier. Frequency drifting should be related to
RTL-SDR dongle and part of phase changes related to
I attempted something similar with SpectrumLab and an
analogue receiver but due to receiver drifting and sound
card poor sampling stability the phase result was a phase
rotation of several degrees by measured interval. Perhaps
GNU Radio and the PLL functions it has could help to
overcome the frequency drift in the measured carrier.
Thanks in advance,
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