I have made of a system which is based on the article attached from this mixer I tuned the YIG to the resonance of the resonator, then i measured the output of the IF on a scope as shown below. When I tuned to ph2 pase shifter i see the "error voltage" level shanges which need to go back to the YIG "FM" port as shown below. Also i need to make sure that the signal going back to the YIG is something which the YIG could make changes so It will be sensitive to the signal. What is the process of making the PLL lock? Thanks.
