That depends to which frequency you set your SDR receiver – you probably want to tune
"off" a bit, to not have DC/LO Leakage. So, if you, say, tune to 90.2 MHz, your signal of
interest would be at -200 kHz, which is 1/5 of the sampling rate.
The way you calculate the parameters in that case is pretty detailedly written down on the
page linked from the block's "documentation" tab:
https://wiki.gnuradio.org/index.php?title=PLL_Carrier_Tracking
If the page leaves any questions open, do not hesitate to follow up!
Best regards,
Marcus
On 1/30/25 5:37 PM, Muhammad Anas wrote:
Dear GNU Radio Community,
I am attempting to demodulate an AM signal with a carrier frequency of 90 MHz and a
message signal frequency of 90 Hz. The sampling rate is 1 MS/s. I am utilizing a PLL
carrier tracking, but I require clarification regarding the appropriate configuration of
its parameters. Specifically, I am unsure how to determine the "center frequency" and
"frequency variations to track" parameters, expressed in radians per sample, as detailed
in the GNU Radio PLL carrier tracking tutorial. Could you please provide guidance on
calculating these parameters for my specific signal characteristics?
Best regards
Muhammad Anas
