I want to test the device with an external LO, is it possible?
The AD9361 transceiver support external LO inputs for the RX and TX, if you want to use the external LO facility then you have to use TX and RX external LO, there is no mix between external and internal.
Unlike the internal synthesizers that always operate from 6-12GHz no matter the RF tune frequency, the frequency applied when an External LO is used is 2X the desired RF tune frequency. The signal is divided internally by 2 to generate the required LO quadrature relationship.
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