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Test of Model RDZ-1 Radio Receiving Equipment

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The model RDZ-1 receiver is designed for ten-channel, crystal-controlled communication in the frequency range from 200 to 400 megacycles. It was manufactured by the Admiral Corporation, Chicago, Illinois, under contract NXsr-7194. The equipment is intended to be electrically and mechanically identical to the Model RDZ receivers, furnished under contract NXsr-55624 by the National Company, Inc., Malden, Massachusetts. Acceptability tests were conducted at the Laboratory to determine whether the performance and mechanical construction of the Model RDZ-1 receiver compared favorably with that of the Model RDZ. Authorization for these tests is contained in reference a. The governing specifications are outline in reference e. No complete tests have been conducted at the Laboratory on a production Model RDZ manufactured by the National Company. The preproduction model of this receiver, designated as the model CXHY, was subjected to type test, and results are to be found in reference f. This preproduction model is, however, representative of a production unit in many respects. The tests of two Model RDZ-1 receivers revealed that electrical performance is generally equal to that of the CXHY. The r-f gain control characteristics were found to be satisfactory after both it and the silencer control were interchanges. The a-f leakage in the silencer circuits was reduced at the Laboratory by a minor change in the wiring of these circuits. The only other serious electrical defect was excessive loss of gain during vibration tests and at elevated temperatures. The majority of mechanical defects have been outlined previously in conference references b and c, and their correction is recommended. The manufacturer has succeeded in producing a unit which is very similar to this prototype model RDZ. If careful attention is given to the correction of defects outlined herein, performance of the RDZ-1 in shipboard service should be equal to that provided by the RDZ.

Subject Categories:

  • Electrical and Electronic Equipment
  • Test Facilities, Equipment and Methods
  • Voice Communications

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