The development of C.H.-type receivers for fixed and mobile working

The paper describes the development of the chain or C.H. type of radar receiver between the years 1937 and 1942. These developments may be divided into the following broad classifications: (a)Mechanical; (b)Radio-frequency circuits; (c)Pulse circuits, including time-base generator; (d)Ancillary functions. A brief reference to some of the anti-jamming devices used is made, but no attempt is made to describe in detail aerial systems or methods of interchange of information with other equipments in the system.