This is what I think I understand by reading the Pluto RX documentation (I am only concerned with the RX at the moment),
1) If I set the sampling rate using: ad9361_set_bb_rate(), the function automatically sets the required setups, decimaters + filters based on the figure 1 attached (from the wiki), then the sampling rates possible are 520 KHz to ??? MHz.
2) If I set the sampling rate using: ad9361_set_bb_rate_custom_filter_auto(), the function automatically sets the required setups, decimaters + filters based on this simple formula:
Fpass = rate / 3 and Fstop = Fpass * 1.25
What are the permissible sampling rates for this function?
3) Do I have to set any other attributes such as: filter_fir_en to use these functions?
4) Do these functions do anything to the: rf_bandwidth, I assume I need to do that myself?
There are a few other filter setters, but once I understand these two I can probably figure out the others.
Thanks for the help,