We developed the evaluation board according to the schematic of RFFC5071A (using slightly different Mini-circuit baluns). On the RF spectrum analyser we can see, that LO is working with the programmed frequency (from the default registers we changed only 3 (mixer 1) + 3 (mixer 2) registers responsible for the frequency programming). Input RF is an RF from the RF transceiver. However there is no RF output from the Output Ports. What could be the problem? After the input balun the input ports show about 1V. Should this voltage be available on the input ports?