1、- MIL-R-L62 7q U 9999906 0240587 T U MIL-R-81462(AS) 1 November 1972 MI LITARY SPEC IF I CAT I ON RADIO SET AWSRC-40 DIGITAL DATA TRANSMITTER TERMINAL This specification has been approved by the Naval Air Systems Command, Department of the Navy 1 .o SCOPE 1.1 hereinafter referred to as the AWSRC-40,
2、 shall provide simultaneous UHF/FSK transmission of the CAINS Alignment and Waypoint data to aircraft equipped with nk-4A airborne equipment equivalent to the AWASW-25WB or AWASW-27B. The AWSRC-40 shall also be capable of transmitting the ACLS data link signal as a single-channel transmitter. Messag
3、es transmitted by the AN/SRC-40*are of the UHF/FSK type as defined by message standards of WR-28 and this specification. 1.2 or similar equipment providing the proper input time-division data link messages. The transmitter and frequency synthesizer modules utilized in this equipment are inter- chang
4、eable with the assemblies from the SM-51 l/ASW. The receiver module utilized in the equipment is interchangeable with the AWASW-25 receiver module. Scope - The Digital Data Transmitter Teminal, Radio Set AWSRC-40, Associated Equihent - The AN/SRC-40 shall operate with the AWSSW-1 FSC 7440. 1 . n Pro
5、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-L4b2 74 997990b 0290588 L 9; MI L-R-81462(AS) 2.0 APPLICABLE DOCUMENTS 2.1 of invifation for bids form a part of this specification to the extent specified herein: General - The following docunents o
6、f the issue in effect on the date Specifications: Mi li tary: M i L-C-9 1 5 MI L-E-16400 Cable, Cord, and Wire, Electrical Electronic Equipment, Naval Ship and Shore; General Specification MI L-E-17555 Electronic and Electrical Equipment and ksociated Repair Parts, Preparation for Delivery of Test P
7、rocedures; Preproduction and Inspection, for Aircraft Electronic Equipment, Fotmat for Nomenclatures and Nameplates for Aero- nautical Electronic and Associated Equipment MI L-T- 18303 MI L-N-18307 Naval Air Systems Command: AR-57 Shipboard Data Link Requirements for Aircraft Internal Navigation Sys
8、tem Alignment and Waypoi nt insertion Message Standards for AWUSC-2, or Equiv., Time Division Data Transmission Systems Installation Instructions for Radio Set AN/SRC-40 Digital Data Transmitter Terminar WR-28 El-600 Standards : Military: MI L-STD- 130 MI L-STD-46 1 I.D. Marking of U.S. Military Pro
9、perty E lec trm ag net c Interference Characteristics Requirements for Equipment MI L-STD-794 Part and Equipment, Procedures for Packaging K , and Packing I 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-L4b2 9999906 k * 0290589 - 3 _ _- - ,
10、- MI L-R-81462(AS) Standards : (Continued) Mili taw: MI L-STD-781 Reliability Tests, Expotential Distri bution MS17322 Meter, Time Totalizing, 115 Volt, 400-Cycle, Rev B 2.1.1 drawings, and publications, refer to both title and nunber. Copies of this specification and applicable specifications requi
11、red by contractors in connection with specific procurement functions may be obtained upon application to the Commanding Officer, Publications None (4) Humidity: Room ambient (5) Input Power Voltage: 115 f 1 .OV., 400 rts 5 Hz 3.3.10 any of the environmental service conditions specified in MIL-E-1640
12、0 for Class 4 equipment, except as otherwise specified herein. Service Conditions - The AN/SRC- shall operate satisfactorily under 3.3.10.1 MIL-E-16400,excepte maximum frequency of vibration shall be 33 Hz. Vibration - The AN/SRC-40 shall meet the vibration requirements of 5 Provided by IHSNot for R
13、esaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-1462 7q M 9999906 0290592 3 -1 MI L=R-81462(AS) 3.3.10.2 - Shock - The AN/SRC-40 shall not suffer damage or subsequently fail to provide the performance specified herein when subjected to 18 impact shocks of 20 G, consis
14、ting of 3 shocks in opposite directions along each of 3 perpendicular axes, with each shock impulse having a time duration of 11 f 1 milliseconds, The “G“ value shall be within f 10% when measured using a 0.2 to 250 Hz filter, and the maximum “GI shall occur at approximately 5-1/2 milliseconds. The
15、unit shall be operational after test. 3.3.10.3 Temperature - The AN/SRC-40 shall be capable of notmal operation, as specified herein, when subjected to the temperature cycle requirements of MIL- E-1 6400. 3.3,10.4 test of MIL-E-16400. Humidity - The AWSRC-40 shall be capable of meeting the humidity
16、Warm-u Time The time required for the AN/SRC-40 to warm up -%TB 3.3.11 prior to operations shal under standard conditions and 20 minutes at extreme service conditions, The time delay is applicable only to obtaining specified frequency stability, as defined in Paragraphs 3.5.1.6.1(4) herein. e ept to
17、 a minimum and shall not exceed 10 minutes 3.3.12 of satisfactory operation when supplied input power having characteristics as defined in MIL-E-16400. The power required shall be of the following type: Primary Input Power Requirements - The AWSRC-40 shall be capable AC Power, Single Phase, 115 V, 4
18、00 Hz, 200 VA A means shail be provided to deenergize the entire AWSRC-40 with one switching function. A power ON/OFF indicator shall also be provided. The capability to remotely energize and deenergire the AWSRC-40 shall also be provided, 3.3.12.1 circuits and overload protection shall meet the req
19、uirements of MIL-E-16400, Fuses shall not be utilized. 3.3.13 in MI L-E-16400 with no external cooling provisions. Primary Power Circuits and Overload Protection - The primary power Cooling - The AWSRC-40 shall operate within the ranges established 3.4 Performance - The performance of the equipment
20、shall be as set forth below, Unless otherwise specified, these specifications shall apply under both standard and extreme service conditions. When reduced performance requirements for service conditions are acceptable, such variations will be specified. 3.5 Detai I Requirements 3.5.1 following requi
21、rements. Qigital Data Transmitter Terminal - The AVSRC-40 shall meet the 6 - , . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L- R-8 1 4621 Function - The AN/SRC-40 shall have the capability of receiving two binary data streams containing CAI N
22、S Primary (Alignment) and Secondary (Waypoint) data, Two separate UHF carriers shall be modulated by the data streams and two separate UHF/FSK signals shall be promut - signals. - - c- Reception of these AN/SRC-40 output signals by aircraft equipped with Link-4A airborne equipment equivalent to the
23、AN/ASW-25A/B or AN/ASW-27B will allow automatic Alignment and Waypoint data insertion for the on-board inertial navi- gation systems. 3.5.1.1.1 Transmitter Duty Cycle - (1) In the CAI NS Transmission Mode, the primary and secondary trans- mitters shall transmit a continuous wave (CW) carrier. Data l
24、ink messages shall be transmitted at a rate of one message every 16 milliseconds in accordance with AR-57, (2) In the ACLS Mode, the transmitter carrier shall alternately be turned on for 14 milliseconds and off FJr 18 milliseconds, The AN/SRC-40 shall also be capable of operating as an All Weather
25、Carrier Landing data link transmitter. In this mode the AN/SRC-40 shall transmit only a single UHF/ FSK signal modulated by the ACLS data from AN/SSW-1( ) or equivalent. 3.5 . 1 .1.2 fullest extent possible within economical limits, the AN/SRC-40 shall include a backup Redundant Design - To ensure t
26、hat the system shal I be reliable to the transmitter that will automatically be switched in to replace a failed transmitter. Re- dundancy shall be utilized as follows: (1) Dual Channel Transmitter Mode - The backup transmitter shall be s.witched in to replace the primary or secondary transmitter in
27、the event that UHF power output of either the primary or the second- ary transmitters drops more than 4 f 2 dB below the 5 watt level. This switching shall be accomplished in less than 16 milliseconds. in the event that failure occurs in both the primary and secondary transmitters, the primary chann
28、el shall have priority for the back- up transmitter. Failure of the primary transmitter shall also be detected by checking for the presence of data at the output of the receiver. In the event that the power output of both the primary and backup transmitters is 4 f 2 dB below the 5 watt level, then t
29、he secondary transmi tter and frequency synthesizer shal I be used to transmit the primary data. Automatic switchover of the input data and proper UHF frequency selection shall be made. This switching shall be performed in less than 32 milliseconds. 7 Provided by IHSNot for ResaleNo reproduction or
30、networking permitted without license from IHS-,-,-NIL-R-81462 74 M 7977706 027057q 7 Ai L-R-81462(AS) 3.5.1 . 1.2 (continued) - (2) Single Channel T/R Mode - In the single channel T/R mode. A- fully redundant transmit channel shall be provided by switching in the secondary frequency synthesizer and
31、the backup transmitter in the event theprimary transmitter - or primary synthesizer fails. - _ - 3.5.1.2 with captive hardware in the box bottom for attachment to a rack mounted slide-out shelf. The front panel shall be a standard 19-inch width and shall not exceed 10.5- inches in height. Form Facto
32、r - The equipment shall be housed in a Shelf-mountable case 3.5.1.2.1 ance with MiL-16400. Surfuce Finish - The surface finish of the equipment will be in accord- 3.51.3 with good designall not exceed 75 pounds, excluding external cable assemblies, antenna usaembly, and Handbook Weight - The weight
33、of the AN/SRC-40 shall be minimum consistent 3.5.1,4 assemblies, func-circuits, etc Contents - The equipment shall. contain the fol lowing assemblies, sub- 8 Electrical equipment housing assembly. Two frequency synthesizer assemblies. Three UHF transmitter assemblies. UHF receiver assembly. Power su
34、pply assembly. Front control panel assembly, Connector panel assembly, Printed circuit card assemblies. PF switching circuitry, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-L462 74 7777706 0270575 7 M 3.5.1.5 operation of the-C-40. The follo
35、wing functions shall be provided: Controls - The front panel of the AN/SRC-40 shall contain controls for (1) Power - On/Off/Remote (2) Primary XMTR FREQ. (3) Primary XMTR ATTEN. (4) Secondary XMTR ATTEN. (5) Mode Con tro I (6) Test Controls (7) XMTR Reset Switch (8) Manual Override Switch (9) Circui
36、t Breaker (10) Elapsed Time Indicator (1 1) Status Indicators (12) Secondary Transmitter Modulation Test Switch (rear panel), 3.5.1 3.1 position all lever switch with pull-to-operate lock. The ON position is Power ON; the OFF position is Power Off; and the REMOTE position shall allow a remote switch
37、 to con- trol the Power ON/OFF function. Power - On/Off/Remote - This function shall be provided by a three 3.5.1.5.2 Frequency Selection - Primary XMTR FREQ. - The frequency selection shall be accomplished by a series of thumbwheel switches properly indexed to provide 0.1 MHz tuning throughout the
38、frequency range of 300.0 to 324.9 MHz. The most significant numerical digit may be engraved on the front panel to minimize the number of thumbwheel switches required to provide visual readout of the selected frequency. 3.5.1.5.3 Align transmitter output. The attenuator shall be adjustable over the r
39、ange of -10 to -80 f 2 dB in 10 dB steps, A manually operated coaxial switch shall be provided to switch the attenuator in or out of the RF line. Primary XMTR. ATTEN. - An RF attenuator shall be utilized to vary the 3.5.1.5.4 the Waypoint output power from -10 to -80 f 2 .dB in 10 dB steps. A manual
40、ly operated coaxial switch shall be provided to switch the attenuator in or out of the RF line, Secondary XMTR. ATTEN, - An RF attenuator shall be utilized to vary 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 MIL-R-BL4b2 74 W 979970b 0290596 O
41、 WI MI L-R-81462(AS) 3.5.1.5.5 A mode control shall be provided to switch the transmitter terminal from use as a CAINS Primary and Secondary data transmitter to a single channel ACLS data transmitter. This control shall provide for external keying of the transmitter and shall utilize the ACLS dura i
42、nput in place of the Align ata input for modulation of the Align transmitter, 3.5.1.5.6 fhree toggle type test switches shall be provided. These switches shall be used to turn off the carrier of each of the three internal transmitters. A momentary type toggle switch shall be used to prevent accident
43、al operation of these three switches. A test switch for inhibiting jhe primary XMTR modulation fault detection logic shall also be provided 3.5.1.5.7 XMTR Reset - There shall be a press-to-reset control for recycling fhe failure detect and priority logic. This control will allow fhe primary an secon
44、dary trans- mitters Po be placed back into operation after having been switched to the OFF position by a failure. Mode Control - Pri./Sec, Chan. XMITonly/Pri. Chan, XMiT/REC - Test Controls - To provide the capability to simulate transmitter failure, 35.1.5.8 to force the system into the following m
45、odes of operation: Manual Override Switch - A six (6) position rotary switch shall be used (1) B/U XMTR OFF (2) (3) Secondary XMTR OFF (4) Normal (5) Primary XMTR OFF (6) 3.5.1.5.9 Circuit Breaker - To provide overall circuit protection, a circuit breaker shall be provided. This circuit breaker shal
46、l be resettable and conveniently located. Secondary and B/U XMTRs OFF Primary and B/U XMTR OFF 3.5.1.5.10 fhe control panel to record operating time. 3.5,1.5.11 unit QS follows: Elapsed Time Indicator - An elapsed time indicator shall be provided on Stutus indicators - indicators shall be located on
47、 the front panel of the (I) GO/NO-GO Indicators (2) Monitor Indicators (a) Primary Transmitter (a) Power ON (b) Primary Data Input (b) Backup XMTR Standby (c) Secondary Transmitter (c) Manual Override ON (d) Secondary Data Input (e) Backup Transmitter 10 Provided by IHSNot for ResaleNo reproduction
48、or networking permitted without license from IHS-,-,-MI L-R-81462(AS) I 3.5.1.5.11 (continued) I _r .- I Both the GO and NO-GO lights for the Ehckup transmitter shall be deenergized until the Backup transmitter is energized for use due to a failure of the Waypoint or Align tjamrnitters. In the ACLS
49、Mode, the GO and NO/GO lights for the %-ndarTTCMTR data input shall be deenergizd. 3.5.1.5.12 Sec. XMTR MOD TEST Switch - A switch shall be provided to switch the receiver L, O, input from the primary frequency synthesizer to the secondary fre- quency synthesizer for test purposes. This switch need not be on the front panel. 3.5.1 3.13 - -_ Protective Cover 44- -_ zkoii hewAr!oA-=- -
