1、F-0/-25 MIL-I-81453A(AS) 10 June 1977 bUperSed+ng 15 DeceIrber 1966 . MIL-1-81453 (AS) MILITARY SPE CIE1 CATION INTERROGATOR SET AN/APX- 76A (V) This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1, SCOPE 1.1 Scope - The equipment covered by this specifica
2、tion shall provide an Air-by-Air IFF Interrogator i RECWWOATIWS WICH tl4 iE OF USE IN IWROVIEjG MIS IXXWENT MY E? SENI TO ME PEEPARING ACTIVITY WHW A SELF-AWRESSED STILIDPRDIZ4TIOT DOCVIEM IMwEmNT PRWOSAL (00 FOR4 1426) APPEARS AT THE END OF WIS DQCUIENT, OR BY . 1; f - _- ETTER ADCMSSED TO TIE CW4I
3、ZN ACTIVITY. I ,A th Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-I-4iY53A 59 U3l 9999906 0076464 9 MIL-I- 814 5 3A (AS ) 1.2.1 Eauipment Confisurations - The AN/APX-7EA(V) is capable of various configurations, depending on the control used :
4、Configuration Equipnient Items (VI 1 C-7383/APX-76 (V) 1 RT-868A/APX-76 (V) I SA-1568A/APX-76 (V) I SN-416A/APX-76 (V) (VI 2 C-7959/APX-76A(V) RT-868A/APX-76 (V) I SNL416A/APX-7 6 (V) (VI 3 C-7994/APX-76A(V) I RT-868A/APX-76 (V) I SAm1568A/APX-76 (V) I SN-416A/APX-76 (V) 1.3 Associated I_ Equipment
5、- The interrogator set is intended to operate with the following associated equipment: Common Name Used in Item this Specification (1 1 Interrogator Computer KLR-A/TSEC Interrogator Computer (2 1 Antenna AS-l9.00/Ai?Q-72 (Radar Antenna Modi- fication Kit) or equivalent Interrogator Antenna (3) Radar
6、 Modification - Kit: Appl. Para. 6.11.1 6.11.2 6.11.3 (4) Radome Modification Kit 6.11.4 * The information contained in paragraphs 6.11.2, 6.11.3 and 6.11.4 is applicable only to the F-4B system. Detailed specifications for these requirements should be obtained from cognizant radar and antenna.perso
7、nne1. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-814 53A (AS I *2. APPLICAl3LE DOCUmNTS Jc2.1 The following.:documents, of issue in effect, on date Of invitation for bids, KEFK oYnei-crise specifisc, this specif icatiori :to the extent s
8、pecified herein. form a part of SPECIFICATIONS Military MIL-C-17 2 Cases, Bases, Mounting; and Mounts, Vibration MIL-W-5088 Wiring; Aircraft, Installation of MIL-E-5400 P Electronic Equipment, Aircraft, General Specification for MIL-T-5422 Testing, Environrnental, Aircraft Electronic Equipn?ent MIL-
9、1-6181 MIL-C-6781 MIL-P-7788 MIL-M-7793 Interference Control Requirements, Aircraft Equipment Control Panel: Aircraft Equi.pment Rack or Console Mounted Plate, Plastic, Lighting Meter, Time Totalizing MIL-E-17555 Electronic and Electrical Equipment and Associated Repair Parts, Preparation for Delive
10、ry of MIL-T-18303 Test Procedures, Preproduction and Inspection for Aircraft Electronic Equipment, format for MIL-N-18307 Nomenclature and Nameplates for Aeronautical Electronic and Associated Equipment 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
11、-,- - MIL-1-81453A 59 W 499790b 007b970 2 MIL-1-81453A (AS) MIL-F-23103 MIL-S-23603 Naval Air Systems Command AR-5 AR- 3 4 Thermal Performance Evaluation, Airborne Electronic Equipment; General Requirement for System Readiness/Maintainability; Avionic Systems Design, General Specification for Microe
12、lectronic Devices Used in Avionic Equipment, Procedures for Selection and Approval of Failure Classification for Reli- ability Testing, General Requirements for DOD-AIMS System Program Office DOD-ATMS 64-900A DD-AIMS 65-1000 DOD-AIMS 69-253 F.-111 Aircraft Exhibit SENX-LM-66-1 dated 5 Aug 66 4 Mode
13、4 Input/Output data, KIR/KXT-A/TSEC. Technical Standard for the ATCRBS/IFF Mark XII systems Performance/Design and Qualification Requirements, Interrogator Set AN/APX-83 (V) Panels-Integrally Illuminated, White F-111 Aircraft Provided by IHSNot for ResaleNo reproduction or networking permitted witho
14、ut license from IHS-,-,-STANDARDS Military MIL-STD-704 MIL-STD-781 Electric Power, Aircraft, Characteristics and Utilization of Reliability Tests, Exponential Distribution MIL-STD-785 MIL-STD-794 MS- 17 3 2 2 Requirements for Reliability Program (For Systems and Equipments) Parts and Equipment, Proc
15、edure for Packaging and Packing of Meter, Time Totalizing, 115 Volt, 400-cycle, Rev. B DRAKNGS DD/AIMS Drawing ins tallat ion in f onnation Wiring NO. X-6CH-1675 Diagram, Interrogator Set AN/APX-76 OTHER Naval Air Systems Command EI-516A Avionics Installation Instructions for Interrogator Set AN/APX
16、-76A(V) and Receive r-Transmitter RT- 9 8 8/A, dated March 31, 1972, ET-516A Bench, Preflight ent of major design objec- tives shall bo the prime consideration. factors shall govern : *3.2.1 Solid State Processes and Microelectronic Modular Assemblies_ - The electronic portion of the equipment shall
17、 be con- structed using solid state processes and microelectronic modular assemblies to the greatest extent possible. microelectronic modular assemblies produced by industrial pro- ducers of demonstrated competence shall be used. In the event production type microelectronic modular assemblies are no
18、t available, the contractor shall first consider establishing (either at the contractors facilities or any other industrial pro8ucers faci- lities) a production line for the microelectronics modular assemblies required, He may utilize conventional electron devices provided the nonsuitability of micr
19、oelectronic modular assemblies is clearly established by the contractor and approved by NAVAIR. In the design and conctmction of microelectronic functional dvices, Specifica- tion AR-5 shall apply. niques, defined as follows, shall be selected in the order of precedence shown : In so doing, the foll
20、owing Production type 3.2.1.1 Microelectronic Techniques - Microelectronic tech- (1) Integrated circuits - An integrated circuit is an assembly in which all of the functional elements, active and passive, are forfied in place by basically the same process techniques. (a) Semiconductor - The function
21、al elements are formed by semiconductor techniques, i.e., diffusion, alloying doping, conductor patterns are deposited. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-I-81Y53A 57 U 7977706 0076973 MIL-I- 81 45 3A (AS) (b) Thin film - All eleme
22、nts formed by deposi- tion processes. (2) Hybrid circuit - a hybrid circuit is however, provision shall be made internal to the synchronizer SN-416A/APX-76 for disabling the ISLS control. pulse, Intemogations shall be generated for a maximum of five to tien seconds upon each initiation by the operat
23、or except as n-oted in paragraph 3.4.2.3. The interrogation rate shall be timed by a trigger input from the radar and shall be counted down by We interrogatoz as follows: Nominal Radar PRF Range Count Down Ratio 0-400 4 O 0-85 O 850-1250 1250-1650 1650-2OOO 1: 3. 2:1 3:Ji 4:l 5:1 (For prfs above 220
24、0 the SIF and Mode 4 pretriggers will be counted down by at least 2:1 by the trigger delay circuitry in the synchronizer before application to the interrogation count- down circuitry. rate be greater than 450.) In no case shall the resulting interrogation 12 Provided by IHSNot for ResaleNo reproduct
25、ion or networking permitted without license from IHS-,-,-MIL-I-B1453A 57 7797706 007b777 7 W MIL-1-8 14 53A (AS) 3.4.1.1.1 Interrogation Radiation - The interrogator set shall interrogate targets in view of the radar. ation technique will include a beam sharpening unction to control the effective be
26、amwidth of the radiation, shall be designed for radiating cum and ifference patterns. sum pattern shall be a unidirectional pattern and the difference pattern shall produce a minimum (null) at the unidirectional patternpeak. The normal radi- The typical antenna The - * 3.4.1.1.2 Interrogation RF Cha
27、racteristics - The interrogator set rf characteristics shall conform with the requirements of DOD-AIMS 65-1000 Technical Standard for the ATCRBS/IFF/iYARK XII SYSTEMS (AIMS). The normal interrogation peak rf power at the antenna shall not; be less than 29 dBW. The normal ISLS pulse peak rf power at
28、the antenna shall not be less than 34 dBW. between the ISLS and interrogation peak power at the antenna shall be nominally 6 dB. a relaxation on requirements of Section 3.5 governing the receiver- transmitter and switch amplifier. The ratio These requirements are not to be construed as 3.4.1.2 Recep
29、tion - The receiver shall employ receiver side lobe suppression (RCLS) to provide the reply display beamwidth control and shall contain a sum channel and a difference channel which shall normal;y be connected to the sum and difference pat- terns of the antenna, respectively. The receiver sum channel
30、 shall be duplexed to the transmitter and the difference channel shall be duplexed to the switch-amplifier when the switch amplifier is used. 3.4.1.2.1 Receiver Frequency - The center frequency of the receiver passband snall be nominally 1090 MHz. *3,4.1,2.2 Receiver Bandwidth - The bandwidth of the
31、 receiver, measured between the points 3 dB down from maximum response, shall not be less than 8.0 MHz. between points 40 dB down from maximum, shall not be more than 22 MHZ. Receiver Sensitivity - In the absence of GTC, the xeceiver sensitivity shall be capable of being set so that a signal level o
32、f no greater than -83 dBm is required to produce decoding of 90% o the Mode 4 replies applied to the sum channel antenna receptacle of the receiver-transmitterc service conditions a degradation of up to 4 dB is allowable. adjustable control which will set the gain of the interrogator set receiver. d
33、ecoding sensitivity of up to 20 dB. Gain Time Control - Gain time control shall be utilized. It shall reduce the receiver gain following each inter- rogation to a low level and then raise the gain exponentially-with tirne matching the expected received signal level. teria appear in paragraph 3.5.2.
34、The receiver bandwidth, measured 3.4,1.2,3 Under all combinations of 3.4.1.2.4 Receiver Gain - There shall be a maintenance The control shall allow a reduction of the receiver L 3.4.1.2.5 Detailed cri- e Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
35、,-ML-I-li53A 59 999790b 007b780 5 W MIL-I- 81453A (AS) 3.4.1.3 Display Video - The interrogator set shall decode the replies accepted by the receiverand generate IFF reply video dis- play signals for use with the associated radar indicator for identification of friendly radar targets. 3.4.1.4 System
36、 Control - The interrogator set shall be con- trolled by an operator. Controls are required to initiate operation, select the desired IFF mode, and codes, maintain code changer setting when aircraft power is turned off and to control loop testing (see 3.4.1.6) . Perf ormance Monitor Function - The i
37、nterrogator set shall. contain built-in performance monitor circuitry which shall sample critical operating parameters and indicate malfunction. System faults shall be localized to the line replaceable unit by means of fault indicators which shall Se provided on the front panel of each major compone
38、nt. Fault alarm indication shall be such as to retai+. tke alarm signal indication in its last state when dc powe,: is renoved from the unJ.t. During each interrogation period, the state of operation of the system shall be indicated on the interrogator cmtrol unit as determined by combining al1 the
39、Individual unit f ;.ult alarm signals. 3.4.1.6 Loop Test - A loop test capability shall be provided by enabling interrogetion and display of replies from the on- board transponder ka check R-F link and IFF coding operation. 3.4 . 1.5 3.4.2 Interrcgator Set Inputs 3.4.2.1 Power - The following power
40、sources are required for - the interrogator set: (reference 3.3.14) (1) 115 volts - 400 Hz - single phase (2) 28 volts - dc 3.4.2.2 Power Control - The interrogator set will become operative when +28 volts dc is supplied to the receiver-transmitter and to the switch-amplifier provided that 115 volts
41、, 400 Hz, single phase is also supplied. In normal operation, power control may be applied by the radar. enable IFF power for ground testing when the radar is off. be accepted to enable interrogation (challenge enable). Interroga- tions shall be transmitted and replies received, processed and provid
42、ed as IFF display video for a maximum of 5 to 10 seconds unless manually terminated in a shorter time by operator release of the interrogate switch. Provision shall be made internal to the synchronizer for disabling the automatic interrogation termi- nating function. A test switch may be provided to
43、 *3.4.2.3 Interrogation Control - A grounding function shall 14 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-,-,-MIL-I-L453A 59 W 9999906 007b982 9 W ML-
44、I- 814 5 3A (AS ) . 3.4.3 Interrogator Set Outputs 3.4.3.1 IFF Display Video - IFF display vi 7 I_ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-frequencies above and below a receiver bandwidth of 36 MHz the response to any signal shal be at least
45、70 dB below the response to a signai at the center frequency of the sum channel of the receiver. 3.5.2.1-1.5 Receiver Gate - The receiver shall provide a receiver gate which, when actuated by an external GTC trigger, shall return the receiver sensitivity to normal from a desensitized level of -12 dB
46、m or less within a period of 25 microseconds when the GTC circuitry is not enabled. adjustable throughout the minimum range of 300 to 6200 microseconds measured from the trigger pulse. Jitter on the trailing edge of the gate shall not exceed 1% of the gate duration. the gate, the receiver sensitivit
47、y shall return to the desensitized level within a period of 75 microseconds. gain time control (GTC) circuitry which, whcn the receiver gate is triggered, shall cause th receiver sensiti Jity-to rise from the desensitized levei to an adjustable initiax or CXC level that is from 20 dB to 40 dB less s
48、ensitive than ncrmal sensitivity within a period of 15 microseconds measured from the receipt of the GTC trigger by the receiver gate. increase from this initial level at 15 microseconds after the receipt of the GTC trigger to within 3.0 dB uf normal sensitivity in such a manner as to be within 2 dB
49、 of a 6-dB-per-octave rate- af-change curve under normal room ambient conditions. extreme environmental test conditions, the receiver sensitivity shall increase in such a manner as to be within 3 dB of a 6-dB-per- octave rate-of-change curve. 30 microseconds after the receipt of the GTC trigger. The GTC circuitry shall be selectable by means of
