A set of 3 PCBs. REV2.0 is a true analogues FS and RM.

Shifts frequencies contained in input signal by an amount equal to externally applied or internally generated reference frequency. Internal reference generator is voltage-controlled, frequency-modulated, and provides the capability of continuous shifting through zero. Raised and lowered frequencies are simultaneously available. Unit incorporates a separate, voltage-controlled, balanced modulator, providing continuous transition from unmodified to amplitude-modulated and ring-modulated signals.