1、MIL-R-23757C 58 m 7777906 0152507 3 f . MIL-R- 23757C (AS) 3 February 1975 SUPERSEDING 14 April 1969 MIL-R-23757B (AS) MILITARY SPECIFICATION RADAR IDENTIFICATION TRANSPONDER SET AN/APX-71A This Military Specification has been approved by the Naval Air Systems Command Department of the Navy. 1. SCOP
2、E 1.1 Scope - The AN/APX-71A equipment described herein is an airborne transponder for use in conjunction with a system of electronic identification. equipment shall provide automatic radar identification of an airborne vehicle so equipped to all suitably equipped challenging aircr ft, surface ships
3、, and ground frceTperat5ng within the operational range of thj system. The 1.2 Classification - Equipment covered by this specification shall consist of the following items: Unit - Type Designation Coder- Receiver Transmitter KY-616 /APX-71A Base, Shock Mount Electrical Equipment MT-45 18/APX- 71A 1
4、.3 Associated Equipment - This equipment shall operate with the associated equipment listed in 6.5. 2. APPLICABLE DOCUMENTS 2.1 General - The following documents of the issue in effect on the date of invitation for bids form a part of this specification to the extent specified herein: SPECIFICATIONS
5、 Mi li tary MIL-E-5400 Electronic Equipment, Aircraft, General Specification for 1 # A, “9-5841 , PAGES, r- TklItS DOWMENT CONTAM _. i : i : -. . . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-E - 17555 MIL-T-18303 . STANDARDS Mi 1 i tary M
6、IL-STD-454 MIL-STD-461 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-23757C 58 9999906 0352509 2 = MI L -C - 23 7 5 7C (AS) WR-98 Microelectronic Devices Used 15 December 1965 in Avionics Equipment, Pro- cedures for Selection and Approval of
7、PUBLICATIONS Mil i tary ANA Bulletin No. 400W Electronic Equipment; Aircraft and Guided Missiles, Applicable Do cumen t s 2.1.1 Availability of Documents - When requesting specifications, standards, drawings, and publications, refer to both title and number. Copies of this specification and applicab
8、le specifications required by contractors in connection with specific procurement functions may be obtained upon application to the Commanding Officer, Naval Supply Depot, Code 105, 5801 Tabor Avenue, Philadelphia, Pennsylvania 19120. 3. REQUIREMENTS 3.1 Preproduction - This specification makes prov
9、ision for preproduction test in_$_ 3.2 Parts and Materials - 3.2.1 - General Requirements - The parts and materials specified in the drawings and related documents for use in construction of this equipment were selected to ensure the fulfillment of all requirements of this specification. Any deviati
10、on by the contractor from the use of these specified parts and materials necessarily places both the burden of proof for the acceptability of the change, and the cost associated therewith, upon the contractor. requested from the procuring activity by the contractor and granted by the procuring activ
11、ity prior to submission of equipments for preproduction tests. parts and material deviations shall not be construed by the contractor to constitute a waiver of the performance requirements or any other requirements of this specification. Approval for deviations must be Approval of 3.2.1.1 3.2.1.2 Al
12、l Parts and Materials - Requirements shall conform to MIL-E-5400. Nonreparable Subassemblies - As outlined in MIL-E-5400, nbn+?eparabl subassemblies, shall be used when practicable. and the amount of circuitry to be included therein shall be approved by the procuring activity. The general size of th
13、e subassembly Nonreparable subassemblies must be reliable. 3.2.1.3 Workmanshie - Equipments manufactured shall meet Sequirement 5 (Soldering) and Requirement 9 (Workmanship) of MIL-STD-454. 3.2.2 Nonstandard Parts and Materials Approval - Approval for the use of nonstandard parts and materials (incl
14、uding electron tubes, transistors and diodes) other than microelectronic devices, shall-be obtained as specified in MIL-E-5400. Microelectronic devices shall be approved in accordance with WR-98. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-
15、23757C(AS) 3.2.3 Microelectronic Modular Assemblies - When used, microelectronic modular assemblies shall meet the requirements of WR-98. 3.2.4 Supplemental Requirements - In the event that the contractor proposes to alter the equipment design delineated by this specification and applicable drawings
16、, the following supplemental requirements for the selection of parts and materials are applicable. 3.2.4.1 Basic Conformance - Parts and materials selected for use in the equipment shall conform to the requirements of MIL-E-5400. Parts shall be selected from those parts included in ANA Bulletin No.
17、400, unless the parts listed therein will not perform adequately in the intended applications and environments specified herein. 3.2.4.2 Interchangeability - The equipment shall meet the interchangeability requirements of MIL-E-5400. standard for measuring interchangeability of all applicable units,
18、 assemblies, subassemblies, and parts. The drawings listed in DL 386AS100 shall be the 3.3 accordance with the drawings and subsidiary specifications listed in DL 386AS100 and related lists, except insofar as errors of omission or commission on the drawings may be incompatible with the requirements
19、of this and related specifications. In any case it is a condition of final acceptance that the equipment manufactured meet all the performance requirements of this specification, and such acceptance test documents as may be applicable. Proposed changes, either to correct drawing discrepancies or to
20、effect improvements, shall be specifically approved by the procuring activity prior to their incorporation. deviations shall be in accordance with MIL-STD-481. Design and Construction - The equipment shall be manufactured in Engineering changes, waivers and 3.3.1 Total Weight - The total weight of t
21、he equipment, excluding cables, shall be a minimum consistent with good design and shall not exceed 9.75 pounds excluding the shock mount, nor exceed 10.5 pounds including the 3.5. mount specified in 3.3.2 Interference Control - The generation of ridio interference by the equipment and the vulnerabi
22、lity of the equipment to radio interference shall conform to the requirements of MIL-STD-461 within the limits established in 3.3.12. Standard Conditions - The following conditions shall be used to establish normal performance characteristics under standard conditions and for making laboratory bench
23、 tests. 3.3.3 Temperature Altitude Normal ground Room ambient (25 - + 5C) Vi brat i on None Humidity Room ambient up to 90% relative 27.5 + 0.5 d-c Input power voltage - Interrogation rate 500 interrogations/sec when not otherwise specified or required 4 I Provided by IHSNot for ResaleNo reproductio
24、n or networking permitted without license from IHS-,-,-MIL-R-23757C (AS) 3.3.4 Service Conditions - The equipment shall operate satisfactorily under any of the environmental service conditions or reasonable combination of these conditions as specified in MIL-E-5400 for Class 2 equipment, except as m
25、odified herein. 3.3.4.1 Vibration - The equipment shall operate satisfactorily when subjected to the vibration requirements of Curves I and II of MIL-E-5400. 3.3.4.2 Temperature - The equipment shall operate satisfactorily when subjected to the temperature requirements of Table I, Class 2 of MIL-E-5
26、400. 3.3.4.3 Altitude - The equipment shall operate satisfactorily when subjected to the altitude requirements of Table I, Class 2, Column VI11 of MIL-E-5400. 3.3.4.4 Temperature-Altitude Combination -The equipment shall operate satisfactorily when subjected to the requirements of Table I, Class 2,
27、Column IV only. 3.3.4.5 Shock - The equipment shall meet the shock requirements of MIL-E-5400 except that impact shock shall be Zog. 3.3.4.6 Salt Spray - The equipment shall withstand exposure to salt spray in accordance with Procedure I of MIL-E-5272. - -3T-3.4,7-Pressurization - The equipment shal
28、l meet the pressurization requirements of MIL-E-5400. 3.3.5 Antenna Mismatch - Anticipated service conditions of impedance mismatch shall include all values of load impedance that present a voltage standing wave ratio (SWR) up to and including 3.5 decibels (DB) (1.497:l SWR) of any phase relationshi
29、p atthe antenna terminal of the receiver-transmitter unit. 3.3.6 Transmitter Duty Cycle - The transmitter shall be capable of continuous operation at 1.0 percent duty cycle. For mean-time-between-failure (MIBF) and life- test considerations, operations shall be at 0.5 percent duty-cycle for 50 minut
30、es and 1.0 percent or 10 minutes of each hour. testing, normal duty-cycle shall be 0.5 percent and limit conditions shall be 0.1 percent and 1.0 percent duty-cycles. For preproduction and acceptance 3.3.6.1 Duty Cycle - Percent duty cycle is defined by the following equation: (PW) x (RC) x (NP) DC =
31、 10 where : DC is percent duty cycle PW is pulse width in microseconds RC is reply caunt in number of counts NP is number of pulses 3. ,7 ,rm-Up Time - The time required for the equipment to warm-up pr-n to operation shall be kept to a minimum and shall not exceed 2 minutes under either standard or
32、extreme service conditions. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-23757C 58 9999906 OL52512 2 m 3.3.8 Input Electrical Power - 3.3.8.1 Operating Power - The equipment shall give specified performance when The power required shall not
33、exceed the energized from the following power source. specified amounts. 3.3.8.1.1 D-C Input Voltage - 17 to 32 volts. 3.3.8.1.2 The input power shall not exceed 50 watts over the input voltage range of 17 to 32 volts d-c. 3.3.8.2 Degraded Performance - Degraded performance will be permitted for vol
34、tage transients of time duration not exceeding 0.5 second during normal AC or DC electric system operation. damage to the equipment. Operation shall return to normal with no resulting 3.3.9 Cooling - The equipment shall not require either an internal blower or external cooling air. 3.3.10 Interrogat
35、ion Characteristics - The equipment shall accept interrogation signals with characteristics in accordance with tables I and II. Table I. Interrogation Mode Spacing I Mode Interrogation Characteristic 2 pulses spaced 5 - + 0.2 USEC 2 3 2 pulses spaced 8 - + 0.2 USEC Table II. Input Pulse Characterist
36、ics Mode - Interrogation Code . 2, 3 Pulse Width 0.8 + 0.1 USEC Rise Time 0.05-tO 0.1 USEC Decay Time Amplitude Variation 0.05 to 0.2 USEC P3 = P1 - + 1 DB 3.3.11 Input Protection - The equipment shall not be damaged by external signals of any frequency or type of modulation of up to 10 volts peak a
37、mplitude and average power of -20 DBM applied directly to the antenna terminal. 3.3.12 Radio Frequency Interference Control - The equipment shall meet the requirements of test CSO1, CS03, CS04, and RS03. With the transponder being Provided by IHSNot for ResaleNo reproduction or networking permitted
38、without license from IHS-,-,-MIL-R-23757C 58 3779306 0152513 4 7 MIL -R-23757C (AS) 3.3.12.2 Narrowband (NB) Limits: The limits shall be increased by 14 dB from 5 to 25 MHz. the frequency decreases from 5 to 0.15 MHz. BB limits shall be increased by 6 dB in the frequency range from 10 KHz to 12.4 GH
39、z. From 0.150 to 5 MHz increase the revised level by 5.5 dB per octave as 3.3.12.3 Test Method CE06 - Antenna Conducted Spurious Emanations Test: The 3.3.12.4 Test Method CS02 - Conducted Susceptibility, Power Lines Test: In the frequency range of 50 KHz to 400 MHz the specified 1.0 V rms test level
40、 shall be reduced to 0.1 V rms. frequency range of 10 KHz to 10 GHz (CW) and 150 KHz to 1 .O GHz (BB) increase the BB limits by 3 dB per octave from 200 MHz to 1.0 GHz. Increase the CW limits by 8.5 dB per octave from 300 Wz to 1.0 GHz and increase the limits by 5 dB per octave as the frequency is d
41、ecreased from 10 to 1. O GHz . The transmitter fundamental frequency (1090 Mc) shall not be included in the tests of 3.3.12.5. Performance - Unless otherwise specified, values set forth to establish the requirements for satisfactory performance .apply to performance under both standard and extreme s
42、ervice and input power conditions. under the extreme conditions is acceptable, tolerances or values setting forth acceptable variations from the performance under the standard conditions will be specified. shall decode these interrogations, and in response, shall transmit proper pulse replies. 3.3.1
43、2.5 Test Method RE02 - Radiated Emissions, Electric Field Test: In the 3.4 When reduced performance 3.4.1 Operation - The equipment shall receive coded interrogations (3.3.10), 3.4.1.1 Input Voltage Range - The equipment shall give full specified performance when operated with steady-state input vol
44、tage from 21 to 32 volts d-c. Full specified performance shall be restored when the input voltage returns to normal. 3.4.1.1.1 The equipment shall operate with the input voltage in the range of 17 to 21 volts d-c, with reduced performance as detailed in 3.4.3.5 and 3.4.7.3.1. 3.4.1.2 Interference Ch
45、aracteristics - The equipment shall operate in the presence of the following types of interfering signals with minimum degradation: 3.4.1.2.1 Continuous Wave and Amplitude Modulated Continuous Wave Interference - The equipment shall operate in the presence of interfering signals consisting of contin
46、uous wave (CW) and amplitude-modulated continuous wave (AMCW) and shall meet the following requirements. throughout the required range of interrogating signal levels. Measurements shall be made to assure compliance (1) If the interrogating signal to which the equipment should reply is between 3 and
47、50 db above the normal triggering level, an interfering signal 10 db below the interrogating signal shall not reduce the number of valid replies more than 50 percent. the interfering signal frequency shall be adjusted for maximum countdown of replies. The AMCW signal shall be simulated using a signa
48、l generator modulated 30 percent by a 1000 Hertz (Hz) cine wave. If the interrogating signal is between 20 and 50 db above the normal triggering level, an interfering signal at a level 3 db down from the interrogating signal shall not reduce the number of replies by more At each level tested (2) (3)
49、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-than 50 percent, except when the interfering signal combines with the interrogating signal in such a way that the amplitude modulation of the resultant signal is inverted or eliminated. 3.4.1.2.2 Pulse Interference - The receiver shall operate in the presence of interfering signals consisting of randomly spaced pulses and regularly spaced
