Engineering Aspects of the TH Microwave Radio Relay System

The operation and maintenance of the TH and TD-2 radio relay systems require communication facilities along the route which can be used for the transmission of voice, protection switching and alarm signals. Special narrow-band microwave facilities, referred to as the auxiliary radio channels, which have been developed as an integral part of the TH system to supply this need, are described in this paper.

Section: Generalmentioning

confidence: 99%

Auxiliary Radio Channels for the TH Radio Relay System

Hatch¹,

Wickliffe²

1961

The TH Broadband Radio Transmitter and Receiver

Sproul¹,

Griffiths²

1961

A general description of the electrical and mechanical features of the TH radio system is given in the two preceding articles.1,2 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.

The TM-l/TL-2 Short Haul Microwave Systems

Friis¹,

Jansen²,

Jensen³

et al. 1966

This paper describes the design and discusses the performance of the TM‐1 and TL‐2 radio relay systems designed for short haul service in the 5925 to 6425 megacycle and the 10,700 to 11,700 megacycle common carrier bands, respectively. Used as a crossband diversity pair, they provide a highly reliable broadband message channel for up to 600 circuits and require little maintenance and relatively low power. These systems are also used to transmit television.