TH-3 Microwave Radio System: Modulators

Abstract

In a TH‐3 repeater the required frequency downconversion, upconversion, and shift is performed by three similar solid state modulators. The choice of an unbalanced design resulted in a simple modulator microwave structure which can be easily tuned and uniformly reproduced. The shift and transmitter modulators use a varactor diode for high pump efficiency while, in the receiver modulator, a Schottky diode is used to achieve a low noise figure and broadband operation.

A broad-band parametric up-converter for S-band troposcatter communication systems

“…Up-converter with medium power output which is t,hen further amplified by a solid state amplifier (Kinoshita 1974, Kato et al 1974 or amplifier using electron tubes (Sicotte 1973, Giust 1971). …”