A suppressed-carrier signal generator for servosystem instrumentation
P. J. Pollard · Transactions of the American Institute of Electrical Engineers Part II Applications and Industry · 1960
This paper describes a method of obtaining a sinusoidal suppressed carrier voltage using two synchros connected in such a way as to eliminate the need for slip rings. The result is a relatively simple and maintenance-free signal generator that is capable of producing modulation frequencies as high as 500 cps (cycles per second).