Hi Val,
1) You want to make sure your IF bandwidth is wider than your signal of interest but not wide enough to include adjacent signals/channels. For FSK, this will mean knowing something about the frequency deviation and padding it. As for filter, yes, you want to know what the transmitter is using and match that.
2) We do not have any LoRa specific measurements. You might be able to use zero-span mode to estimate chip rates. My understanding is that its some sort of chirp like signal. That can be viewed with an FM v Time plot in zero-span, using markers to estimate chip rates?
Andrew
