A simple DSP trick added into the most recent version of N1ADJ’s Go M17 gateway reduced MER down from 3.5% to under 2% (tested with a CS7000). A short IIR filter equalizes the frequency response of the CC1200 demodulator, improving the eye diagram. Additionally, the demodulator’s sensitivity has been adjusted for optimal M17 reception.
GitHub: https://github.com/jancona/m17
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