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.
Final rept. 30 Jun 75-11 Mar 76,
NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF
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Laboratory tests verify the reported susceptibility of the ANGRA-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 ANGRA-39 is shown to be operationally compatible with the TSECKY-65 narrowband secure voice unit.
- Radio Communications