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Direction Finding Set AN/PRD-1 is designed for use a mobile and portable radio direction finder. The basic equipment consists of a loop antenna, a superheterodyne-type receiver, and power supply unit. The equipment covers a frequency range of 100k kc (kilocycles) to 30 mc (megacycles) in seven overlapping bands. The set is capable of receiveing cw (coninuous wave), icw (interrupted continuous wave), and a-m (amplitude modulated) signals troughout the frequency range, and of receiving f-m (frequency modulated) signals in the range of 12.5 to 30 mc. The complete equipment consists of Antenna AS-536/PRD-1, Antenna AT-301/PRD-1, Radio Receiver R-395/PRD-1, Dynamotor Power Supply DY-79/PRD-1, Battery Box CY-947/PRD-1, Direction Finder Tripod MT-870/PRD-1 and a number of additional components. Direction Finder Set AN/PRD-1 is used to determine the direction of arrival of transmitted radio signals from friendly or enemy source. By orienting the antenna and operating the receiver, the direction can be determined easily by using a null method.
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