I'm using the FMCOMMS5 board with a ZC706. I'm running the Windows version of IIO Oscilloscope as well as an in house Windows applications that I've developed.
I've been playing around with the AD9361 for a while now, and ever since I received the device I could tune the receiver chain down to a 1 MSPS sample rate WITHOUT loading a FIR filter. However, I suddenly can no longer go below about 2.08 MSPS without a FIR filter.
I did some searching, and from what I can see from the latest documentation, 2.08 MSPS is the intended min sample rate.
My question is: why was I able to go down to 1 MSPS before? The only change is that I ran the update script on the ZC706. Was it a bug before that allowed me to set the sample rate that low?