The TH Broadband Radio Transmitter and Receiver

A general description of the electrical and mechanical features of the TH radio system is given in the two preceding articles.12 This paper describes the broadband radio receivers and transmitters in detail. Special attention is given to the new features: the receiver modulator with germanium diodes and its associated preamplifier with a noise figure of 10 db; the IF main amplifier in which nearly all adjustments have been eliminated; the amplifier-limiter with unusually low AM/PM conversion; the high-power transmitter modulator using a varactor diode to avoid conversion loss; and finally the 5-watt traveling-wave tube amplifier.