Accession Number : ADA031763

Title :   AN/GRA-39 Radio Set Control Group Modification. Addition of Two Capacitors and a Choke to Microphone Input Circuits Enables AN/GRA-39 to be Used with New MC hf Radio Systems.

Descriptive Note : Final rept. 30 Jun 75-11 Mar 76,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF

Personal Author(s) : Hessling,R. J.

Report Date : 12 AUG 1976

Pagination or Media Count : 32

Abstract : Laboratory tests verify the reported susceptibility of the AN/GRA-39 to powerful hf fields. Instability results from detection of the envelope of an AM signal by the remote unit microphone amplifier input circuit. The modification reduces the rf vulnerability of the remote unit by 40-60 dB over the 2-30 MHz band. The modified AN/GRA-39 is shown to be operationally compatible with the TSEC/KY-65 narrowband secure voice unit.

Descriptors :   *RADIO EQUIPMENT, HIGH FREQUENCY, MODIFICATION, MICROPHONES, REMOTE CONTROL, ELECTROMAGNETIC COMPATIBILITY, VOICE COMMUNICATIONS, SECURE COMMUNICATIONS.

Subject Categories : RADIO COMMUNICATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE

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