CIA-RDP78-03424A002400060003-8.pdf

i wr yaete pam) revs TOS ~~ 'Sanitized Copy Approved for Release 201 1/09/20 : CIA-RDP78-03424A002400060003-8 \ hake bv. an ona “4 \ 25X11 A SUMMARY OF ‘SPECIFIED TESTS OF THE RS/C-11 RADIO SET DATE: 30 July 1957 Sanitized Copy Approved for Release 2011/09/20 : CIA-RDP78-03424A002400060003-8

{ Sanitized Copy Approved for Release 2011/09/20 : CIA-RDP78-03424A002400060003-8 te \ 4 1. INTRODUCTION The RS/C-11 Radio Set prototype model developed by the has been received by the R&D Laboratory for preliminary tests of receiver sensitivity, selectivity, calibration, and over-all drift characteristics. The radio set is comparable to the RS/A-11 and RS/B-11 prototype models in size, weight, printed circuitry, and electrical and mechanical characteristics. The exception being that the RS/C-11 units operate in the 4 - 16 mc frequency range. During initial tests, the receiver failed to functi…

| Sanitized Copy Approved for Release 2011/09/20 : CIA-RDP78-03424A002400060003-8 \ Page 2 2. SUMMARY OF RECEIVER TEST DATA 2.1. AM and CW Sensitivity and Raw Noise Output Sensitivity: ™ Raw Noise Output: Minimum - 19.0 microvolts at 16 me 0.525 microwatt at 12 mc Maximm - 4.2 microvolts at 4 me 3.6 microwatts at 4 me Average - 11.0 microvolts 1.265 microwatts. cw ; Minimum - 11.0 microvolts at 16 me 15.5 microwatts at 10 mc Maximum - 1.3 microvolts at 4 mec 36.0 microwatts at 4 mc Average - 4.6 microvolts 21.7 microwatts Specifications: AM sensitivity to be 15 microvolts into 300 ohms for 0.5…

3 Sanitized Copy Approved for Release 2011/09/20 : CIA-RDP78-03424A002400060003-8 2.3. 2.h. Receiver Over-all Drift Average Drift: Minimum - 10.9 cycles per minute (0.000091%) after 24 hours Maximum - 95.5 cycles per minute (0.00079) during first 20 minutes Over-all - 62.2 cycles per minute (0.00052%) during 3 hour test The drift curve appears on page 6. Specifications: The rate of frequency change shall not exceed 0.0004% at any point of the curve. Selectivity Receiver bandwidth - 4535 cycles at the 6 db points Shape factor - 5.0 The selectivity curve appears on page 7. Specifications: Bandwi…

XY Sanitized Copy Approved for Release 2011/09/20 : CIA-RDP78-03424A002400060003-8 3.1. 3.2. Page 4 3. CONCLUSIONS AND RECOMMENDATIONS Conclusions The RS/C-11 receiver performed satisfactorily in two of the speci- fied tests. The unit meets the specifications regarding sensitivity except at the high end of band 2 (16 mc). The receiver bandwidth was found to be 4230 cycles, rather than 5400 cycles as required in the test specifications. The receiver calibration and over-all drift characteristics are not satisfactory. Future acceptance of the receiver as a prototype model is considered, primaril…

_  Sanitized Copy Approved for Release 2011/09/20 : CIA-RDP78-03424A002400060003-8 ; Page 5. 3.3. Malfunctions The following malfunctions occurred during testing of the RS8/C-11 Receiver: (1) Earset receptacle broke. (2) Audio printed board shorted to the tape roller lip on the receiver case inner wall. (3) The HFO printed board was cut too short so that it is possible to mismatch the board pins and pin receptacles on the main printed board. (4) BFO tube (1AKH) defective. (5) IF tube (1AD4) defective. Sanitized Copy Approved for Release 2011/09/20 : CIA-RDP78-03424A002400060003-8

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