This is a successful implementation of RTL433 and WEEWX, using SDR.
I have an Acurite5n1 weather station and a Misol wh31, which both transmit radio.
Although WEEWX cannot receive two signals at once, RTL433 can receive signals from multiple devices at different frequencies. The RTL433 writers have analysed and decode many outputs from many devices and have procedures for us users to follow, which will tell us which parameters to pass to RTL433. It can then output a single JSON file.
Thus, RTL433 deals with multiple sources and aggregates the data into one file that WEEWX can use.
I have attached my weewx.conf, after having removed my identifying marks.
Issues:
Mostly, PYTHONPATH and having all the bits in appropriate directories.
I still don't have correct rainfall data, but as we are in drought, that's not important.