Dual Detector Prevent Locking On Sidebands

Here’s the figure of the design circuit for dual detector to prevent locking on the sideband circuit.

Anti sideband circuit rejects side-band locking while telemetry tracking loop is automatically searching for signals around i-f value. Circuit also provides both p-m and aim demodulation. Emitter-follower Q1, receiving i-f signal, feeds discriminator Q6-07 through limiters Q2-Q3 and Q4-05. For 455-kc input, d-c outputs of diode detectors cancel at hose of Q8. For lower or higher frequencies, difference voltage serves to apply anti sideband error signal to loop fiber through Q9 or Q10. [Circuit diagram source: Seekic.com]