Was reading the reference manual for AD9361, it states on Pg 19 "Unlike the internal synthesizers that always operate from 6 GHz to 12 GHz no matter the RF tune frequency, the frequency applied when an External LO is used is 2× the desired RF LO frequency." I don't quite understand this statement.
So, if my RF frequency is 1.5GHz, I must use 3GHz for LO? Could anyone please help to clarify? Thank you.