Accession Number : AD0783953

Title :   Evaluation of the Thermal Characteristics of the AN/WQC-2 Final Amplifier,


Personal Author(s) : Penrod,Jack R.

Report Date : 1974

Pagination or Media Count : 22

Abstract : An investigation was made of the thermal breakdown of eight AN/WQC-2 final amplifier transistors. After extensive investigation, it was found that the AN/WQC-2 system is safeguarded against final amplifier transistor failure due to overheating by a thermal interlock switch (3A4S1) mounted, essentially, on one of the final amplifier transistors (3A4Q17). In the event of a blower (3A4B1) failure the final amplifier would be protected, unless, either final amplifier transistor, 3A4Q17, or thermal interlock 3A4S1, was inoperative, then the thermal protection circuit would be defeated and thermal breakdowns imminent. Another possible final amplifier failure mode is direct overloading of the amplifier by too great of an Auxiliary 2 mode drive level, which would always lead to transistor failures. (Modified author abstract)

Descriptors :   *Transistor amplifiers, Underwater communications, Sonar, Thermal properties, Reliability(Electronics), Failure(Electronics)

Subject Categories : Electrical and Electronic Equipment
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE