Wmbus device , using different frequency and different transmission speed

[xaelsouth]

Wmbus device , using different frequency and different transmission speed

[xaelsouth]

Hello jacksonlancaster.

The frequency does not matter, yet the transmission rate.

ideally we want 8 samples per chip at 100kbps transmission rate. rtl_wmbus achieves this by sampling at 1.6M and then decimate the signal by the factor 2.

Therefore, the sampling rate must be set to at least 2MHz if you have 250kbps transmission rate and you still need 8 samples per chip. You could do something this like this:
rtl_sdr -f 918.5M -s 2000000 - 2>/dev/null | rtl_wmbus -d 1

"-d 1" means there is no decimation applied to the sampled signal. But you have to recalculate all filter coefficients for the new sample rate, which in that case is 2MHz (instead of 800kHz) .