Simon,
Well, and I can only tell you from personal experience using the LimeSDR with LMS7Suite, but to get the receive and transmit into the HF band you have to perform an upconversion in receive and a downconversion in transmit to make it work. The lower limit of the design is 30 MHz and you up/down convert from there. It works, but it is a little bit of tomfoolery to get there. When you get your board and load LMS7Suite I can help you with this. On the flip, from 30 MHz to its upper range at 3.8 GHz it’s largely unaffected from what I know of the design - you just tune and go.
Let me know if you need more info, Simon,
73 de Marty, KN0CK