1、MIL- R- 81 6 80 (AS ) 6 December 1972 MILITARY SPECIFICATION RECE1 VER, RADIO R-1651 /ARA This specification has been approved by the Naval Air Sys-tems Command, Department of the Navy. 1. SCOPE 1 .l, be of one type and shall provide for the reception of signals from radio sonobuoys to provide sonob
2、uoy homing and on-top position in- dicating when used in conjunction with direction finder equipment. Scope - The equipment covered by this specification shall 2. APPLICABLE DOCUMENTS 2.1 on the date of invitation for bids form a-part of this specification to the extent specified herein: General- Th
3、e following documents of the issue in effect SPEC1 FICATIONS Mi 1 i tary MI L- W- 50 88 Wiring, Aircraft, Installation of MIL-E-5400 Electronic Equipment, Aircraft General Specification for MIL -T- 54 2 2 Environmental Testing Aircraft Electronic Equipment MIL-D-7033 Direction Finder Group AN/ARA-25
4、, Mi 1 i tary Speci fi cati on FSC 5845 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-81680 (AS) MiL-T- MIL-N- MIL-E-17555 Electronic and Electrical Equipment and Associated Repair Parts, Prepara- tion for Delivery of 8303 Test Procedures : P
5、reproducti on and Inspection for Aircraft Electronic Equipment, Format for Nomencl ature and Namepl ates for Aeronautical Electronic and Associated Equipment 8307 MIL-T-23103 Thermal Performance EvaTuation Airborne Electronics Equipment , General Require- ments for Naval Ai F Systems Gomand AR- 34 S
6、TANDARDS Mi 1 i tary MIL-STD- 461 Fai 1 Ure C1 assi.f icati on for Re1 i abi 1 i ty Testing,. General Requirements for Electromagnetic Interference Character- istics Requirements for Equipments MIL-STD-704 Electric Rower, Aircraft, Char-acteristics and Utilization of MIL-STD-794 Parts and Equipment
7、, Procedure for MIL- STD-785 Re1 Equ MI L-STD- 781 Re 1 but Packagi n abi 1 pmen abi 1 on and Packing of ty Program for System and Deve1 opment and Production ty Test , Exponenti al Dis tri - 2.1.1 Standards. drawincis. and Dub1 i cations. refer to both title and number. Availability of Documents -
8、(1) When requesting specifications, Copies of-this specificatjon and appl cable specifications required by contractors in connection with specific procurement functions may be obtained upon appl i cati on to the Commanding Offi Cer, Pub1 i cations and Foms Center, Code 105, 5801 Tabor Avenue, Philad
9、elphia, Pennsylvania 19120. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3.2.1 satisfactory performance, continuously or intermittently for a perio
10、d of at least 1000 hours without necessity for readjustment of any controls which are inaccessible to the operator during normal use. Operational Stability - The equipment shall operate with 3.3.2.2 life of 5000 hours with reasonable -servicing -and replacement of parts. Parts requiring schduled rep
11、lacement shall be specified by the contractor. Operating Life - The equipment shall have a total operating 3.3.2.3 Reliabi?ity in Mean Time Between Failure 9MTBF) - The equipment shall have 1000 hours of mean (operating) time between failures when tested and accepted as outlined under the requiremen
12、ts 4.4.3. 3.3.3 the use of cables and connectors in accordance with Specification - CablSng and Gonnectors - The equipment shall provide for MIL-E-5400. 3.3.3.2 connection Cabling - The equipment shall be capable of satisfactory appl i cab1 e requ wiring shall be wires may be sh ference control oper
13、ation using exernal wiring in accordance with the rements of Specification MIL-W-5088. unshielded,. except that a mfnimum number of the individual elded when demonstrated as necessary to meet the inter- requirements and provided the assembly of the cable to The external its plugs may be easily accom
14、plished, o% the connectors attached to the cables shall not be supplied as part of the equipment. External cables and that portion 3.3.4 changeabil Interchangeabi 1 ity - The equipment shall .meet the inter- . . ty requirements of Specification MIL-E-5400. 4 Provided by IHSNot for ResaleNo reproduct
15、ion or networking permitted without license from IHS-,-,-MIL-R-BLbt30 5t3 77777Ob OL7Lt393 3 M 3.3.5 Interference Control - The generation of radio by the equipment and the vulnerability of the equipment to interference shall be control led within the 1 imits of Spec MIL-STD-461. 3.3.6 Maintenance P
16、rovisions and Field Testing - Prov interference radio ficat on sions for maintenance shall be as -specified in Specification MIL-E-5400. Test points shall be provided on the front of the receiver to monitor Sig- nificant voltages necessary to the maintenance cycle, .including as a mi ni mum : a. b.
17、Receiver Power Supply c. Audio Output d. AGC e. Ground Direction Finder Group Power Supply Additional internal test points as necessary shall be provided for ease of trouble analysis. 3.3.7 Nomencl ature, Namepl ates and Identification Marking - Nomenclatureland serial number assignment, namplate ap
18、proval and identification marking shall be in accordance with Specification MIL-N-18307. 3.3.8 Standard Conditions - The following conditions shall be used to establish normal performance characteristics under standard conditions and for making laboratory bench tests. Temper at u re Al ti tude Norma
19、l ground Vi bration None Humidity Input Power Vol tage Room ambient (25C 2 10C) Room ambient up to 90% relative humi di ty 115 4 1 .O VAC, 400 Hz and 27.5 + 0.5 VDC - L- ?+ :l Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ MIL-R-83680 58 777770b
20、0373894 5 MIL-R-81680 (AS) 5 . 3 9 satisfactorily under any of the environmental service conditions or reasonable combination of these conditions as specified in Specification MIL-E-5400 for Class 1 equipment, except as modified herein. Service Conditions - The equipment shall operate 3.3.9.1 Vibrat
21、ion - The equipment shall operate satisfactorily when subjeeted to the vibration requirements of Curve I of Specification MIL-T-5422. 3.3.9.2 Altitude - The receiver shall be capable of satis- factory operation at altitudes up to 35,000 feet. 3.3 10 Warm-up Time - The time required for the equipment
22、 eo warm up prior to operations shall be kept to a minimum and shall not exceed 5 seconds under standard conditions and 15 seconds at extreme service conditions. 3.3.11 Input Electrical Power - 3.3.11.1 Operating Power - The equipment shall meet all applicable requirements of MIL-STD-7.04 and shall
23、give specified performance when energized from the following power sources having characteristics and limits defined in MIL-STD-704. (1) AC Power (Single Phase), 115 V, Category B, 15VA (2) DC Power, 28V, Category By 20 Watts 3.3.12 Output Power - The receiver shall be capable of continuously provid
24、ing 225 volts DC - + 10 percent at 30 milliamperes - + 20 percent tube plate output power for either the AN-608/ARA-25 or AM-1777lARA-25A Electronic Control Amplifiers, except that the equipment shall provide 225 volts DC - + 40 percent during the normal voltage transients of MIL-STD-704. With norma
25、l steady state voltage applied, this voltage shall contain no more than 0.50 volt ripple (RMS). . 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-8Lb80 58 7777706 OL7L895 7 MIL-R-81680 (AS) Internal Adjustments - Adjustnientc shall be kept to
26、 a 3.3.13 nrb-hun and shall be easily accessible upon rmal of receiver dust cover. delivery so that the receiver is operating satisfactorily to the re- quirments herein. noml operation hours. All adjustments shall be factory aligned and present prior to Alignment shall ,be stable for a minimum of 40
27、0 3.3.14 which is readily rmvable without attacbt to wiring or other ob- structions. protection as specified by MIL-E-5400. Dust Cover - An external dust cover shall be supplied The dust cover shail provide adequate sand and dust 3 .3.15 rermval of the receiver chai1 be supplied. Mxnt - A mounting p
28、late providing for easy attachent and 3.3.16 Cooling -.The equipnent shall operate satisfactorily under the thermal conditions detennined from an evaluation per MLGF23103. 3.4 to establish the requirments for satisfactory performance apply to performance under both standard and extreme service condi
29、tions. reduced performance under the extreme conditions is acceptable, toler- ances or values setting forth acceptable variations from the performance under the standard conditions will be specified. Performance - Unless otherwise specified, values set forth When 3.4.1 impeaance with, and accept the
30、 voltage and impedance output levels fran the AS-578/ARA-25 or AS-578A/ARA-25 antenna assemblies. Antenna sharing capability shall be provided by an interml miniature coaxial relay. shall be provided internally. Associated systems functions including AGC, sensitivity, audio and ADF shall also be swi
31、tched as necessary. All receiver connectors as well as all circuit protective devices, if required, shall be located on the front of the unit. shall preampiify, convert, I.F. amplify, and amplitude.detect the antenna output and provide acceptable voltage and impedance utput Operation - The receiver
32、shall be cmpatible with, match Relaying of tube plate per for *e direction finder group The receiver . 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
33、-MI L-R-81680 (AS) 3.4.2 over the range of frequencies from 162 to 174 MHz in such manner that any one of the fol 1 owing thi rty-one channels may be cwi tch-sel ected. Frequency Range - The receiver shall operate Channel No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Frequency (MHz) 162.250 163.000 163
34、.750 164.500 165.250 166.000 166.750 167.500 168.250 169.000 169.750 170.500 171.250 172.000 172.750 173.500 Channel No. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Frequency (MHz) 162.625 163.375 164.125 164.875 165.625 166.375 167.1 25 167.875 168.625 169.375 170.1 25 170.875 171.625 172.375 173.
35、1 25 3.4.3 Local Oscillator - The local oscillator stability shall be such that any change in alignment, including reset error caused by cycling of the channel selector or drift caused by aging of component parts, shall not exceed 5 10 kilohertz from the assigned channel frequency for the temperatur
36、e range from -20C to “35C. temperature ranges from -54C to -20C andfrom +35“C to +55“C, the local oscillator drift shall not exceed - t 15 kilohertz from the as si gned channel frequency . For the 3.4.4 Overall Gain Stability - The gain stability of this receiver shall be such that regenerative osci
37、llatory conditions do not prevail for any value of carrier level at the antenna connector below 10,000 microvolts. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.4.5 Sensitivity - A 10-decibel (db) signal-to-noise ratio shall exist at the audio
38、output when a 2.5-microvolt signal, 30 per- cent modulated by a 100 Hz square wave, is applied at the antenna conn shall be such tha of the reference 22,000-ohm resist the audio output from 75-500 Hz is flat within - t 2 eve1 output at 100 Hz when measured over an externa ve impedance. 10 Provided b
39、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-836O 5 9999906 0373899 4 M I L- R-81680 (AS ) 3.4.11.2 level of audio output for 100 Hz shall be 0.5 volt . Audio Level - The root-mean-square (rms) 3.4.11.3 Audio Level Range - When a 100 Hz, 30-percent sq
40、uare wave modulated carrier signal of 2.5 microvolts or greater is applied to the receiver, the amp1 i tude detected and amplified audio output shall be adjustable from 0.25 volt rms minimum to 1 .O volt rms over an external 22,000-ohm resistive impedance. 3.4.12 Overall Phase Delay - Phase delay be
41、tween the lOO=Hz modula- tion entering the receiver and the 100-Hz demodulated audio signal used as. the input to the Electronic Control AmplifierS.of the AN/ARA-25 Direction- Finder Group shall be 180 f 1 O degrees. 3.4.13 RF Bandpass Filter - RF amplifier circuits shall feature an input and output
42、 tuned circuit or filter to reject signals below 162.25 megahertz and above 173.50 megahertz. 3.4.14 Reduced Size Coaxial Relay - Internal coaxial relay used for antenna sharing shall have a maximum.of 0.5-db insertion loss and shall have a minimum of 40-db isolation between open contacts measured a
43、t 225 megahertz. 3.4.15 Remote “Adequate Signal Strength Indi cator“ - The receiver shall contain switching circuits and a threshold control that is adjust- able and shall operate upon receiving an RF signal o receiver antenna connector. It shall never operate signal. When actuated, the switching ci
44、rcuits shall to the external circuit. Depending upon circuit des above function without the use of a threshold contro -86 dbm at the n the absence of supply a ground gn, performance of the is preferred. 3.4.16 Headphone Output - A nominal audio output of 4 to 6 volts (rms) shall be supplied at 400 H
45、ertz. The output audio. line shall be 600 ohms. I1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-LbO 58 7979906 OL7LOO 7 W MI L-R-81680 (AS) 3.4.17 pression shall conform to the requirements of MIL-1-6181. The receiver shall include radio fre
46、quency (RF) bandpass features in the RF amplifier and adequate i ndi vidual channel sel ecti vi ty in succeedi ng stages. 3.4.18 Form Factor - The equipment shall be enclosed in a single case not to exceed 3.05 inches wide by 4.95 inches high by 5.30 inches long. The receiver shall be hard mounted w
47、ithout vibration isolators. Radio Interference Suppression - Radio interference sup- 4.0 QUALITY ASSURANCE PROVISIONS 4.1 the supplier is responsible for the performance of all test requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any co
48、mmercial laboratory acceptable to the Government. The Government reserves the right to perform any of the tests set forth in thekpecification where such tests are deemed necessary to assure supplies and services conform to prescri bed require- ments. Responsibility for Inspection - Unless otherwise
49、specified, 4.1.1 shall be subjected to the following tests to determine compliance with all applicable requirements. Classification of Tests - Items covered by this speciTication (1) Preproduction (First Article) Tests (2) Ini tia1 Production Tests (3) Acceptance Tests (4) Life Tests 4.2 Preproduction Tests - Preproduction tests shall be con- du
