Broadband crystal video front end for radar warning receivers

The paper describes a broadband crystal video receiver, optimised for use in radar warning receivers with a direction-finding capability. The system design and the technologies adopted have been chosen to obtain a small, light and reliable line-replaceable unit that requires no particular adjustment to interface with other circuits. The receiver features a frequency-band-sorting capability to improve performance in a dense electromagnetic environment and is equipped with the important complementary functions of an internal voltage regulator and an RF test source.