Comments (2)
Aang23
commented on May 24, 2024
Hi!
Decimation is actually already done internally, in the demodulator. Taking LRPT, the signal will automatically be resampled at 3x the symbolrate (216kHz) maximum. That is done to avoid insane processing time or other issues when using overkill samplerates such as 10Mhz or so which would usually cause the clock recovery to mess up at such oversampling.
You can hence feel free to use any samplerate (RTL-SDR Maximum 2.4 / 2.56M though! Over that samples will get dropped).
However, as that is done in the demodulator it does not show in the FFT Window, which gets fed the full spectrum.
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K4KDR
commented on May 24, 2024
Thank you!! Very good to know. I was just going by the visual in the FFT & wondered if my SNR could be improved by some decimation. Great to know that is taken care of!
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