1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-28763C 58 m 7797906 OL5LI672 I m 3.0 REQUIREMENTS 3.1 First article. 3.2 Equipment description 3
2、.2.1 Compatibility. The interrogator set described herein shall be fully compatible when When specified (see 6.2), the contractor shall furnish two sample units for first article inspection and approval (see 4.3 and 6.3). operated with all existing shipboard IFF MARK X SIF and IFF MARK XII equipment
3、s. shall be capable of replacing the AN/UPX -293 on a complete electrical and functional basis without any alteration to external cabling, connectors, mounting provisions, wiring, electrical signals (RF, video, control), or any other external condition normally required for the AN/UPX-23. Enable swi
4、tches, or both, are in the OFF position), the equipment shall be considered fully oper- ational, but neither transmitting nor receiving. When in nonoperating condition, the equipment shall be fully assembled for operation but drawing no power. 3.2.1.1 Replacement of the Interro ator Set AN/UPX-23. T
5、he equipment specified herein 3.2.2 Standby condition. When in standby condition (either the Challenge switch or the Mode 3.2.3 Nonoperating condition. 3.2.4 Cabinet. The equipment specified herein shall be housed in one cabinet. The external dimensions ofcabinet shall not exceed those of the AN/UPX
6、-23 Interrogator Set. holes shall be provided in the bottom of the cabinet to facilitate mounting the interrogator on a horizontal surface. The diameter and placement of the mounting holes shall be identical to the mounting holes on the AN/UPX-23. The cabinet shall be dripproof in accordance with MI
7、L-STD-108. Front and rear panels of this equipment shall contain alT controls, meters, test points, connectors, fuses, and so forth, respectively contained on the front and rear panels of the AN/UPX-23. shall be identical in type to their respective connectors on the AN/UPX-23. Multi-pin connectors
8、shall be wired identically to their appropriate multi-pin connectors on the AN/UPX-23. relative positions of the external connectors (on the front and rear panels) shall be as close as possible to the positions of the corresponding connectors on the AN/UPX-23. Four mounting 3.2.4.1 Panel. 3.2.4.2 Ex
9、ternal connectors. All external connectors (coaxial and multi-pin connectors) The 3.3 Equipment composition. The equipment shall be comprised of the following major units: a. Receiver/Transmitter b. Coder/Synchronizer c. Power Supply 3.3.1 Ma-in chassis. Although treated hereinafter as separate unit
10、s for ease of description, the Recei.ver/Transmitter, Coder/Synchronizer, and Power Supply units shall be integrated on a single drawer chassis, capable of complete withdraw or three-quarters lock position from the cabinet for the purpose of convenient maintenance. shall be provided to automatically
11、 disable primary power to the drawer chassis when it is with- drawn from the equipment cabinet. Mechanically resettable interlock switches 3.4 General requirements. Unless otherwise specified herein, the equipment shall be in accordance with MIL-t-16400 , Class 2. 3.4.1 Selection of parts. The selec
12、tion of parts in accordance with MIL-E-16400 shall not preclude the use of parts of smaller physical characteristics, provided that the use of such parts is restricted to these applications whereby a saving in weight or one metric (linear) dimension of at least 25 percent can be effected. 3 Provided
13、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-PlIL-I-28763C58 9979906 015673 3 W- MIL-I-28763C( EC) 3.4.1.1 Solid state components. Maximum feasible use shall be made of solid state com- ponents in the design of the li-I- I nterrogator Set. Use of thermion
14、ic and ionizing tubes shal require written authorization from the procuring activity and shall be used only where no suitable solid-state devices are available, such as in the transmitter output stages. Solid state components capable of working over a broad range of temperature shall be used wheneve
15、r such use is technically feasible, and the added cost is not excessive. MIL-E-16400, except MIL-C-13777 shall be used for portable use, if required. shall be furnished with all connectors, receptacles, or plugs. 3.4.2 Environmental conditions. The equipment shall be designed to reliably conform to
16、performance requirements and within the environmental limits specified herein. 3.4.3 Electrical design. The equipment shall be designed and fabricated for a minimum loss of operational capability as functions are lost or become inoperative due to electrical, electronic, or physical failures. both AC
17、 lines on the primary side of the power supply. mounted on the front panel of the equipment. corresponding active fuse. the requirements of MIL-F-19207. for protection from damage due to overload and excessive heating, in accordance with the require- ments of MIL-E-16400, except as modified herein.
18、be only as approved by the procuring activity. 3.4.1.2 Cables and connectors. Power and control cables shall be as specified in Mating connectors 3.4.3.1 Primary power circuits. Fuses with blown fuse indicators shall be provided in These fuses and spare fuses shall be Spare fuses shall be located ad
19、jacent to the Fuseholders and blown fuse indicators shall be in accordance with 3.4.3.1.1 Overload protection. Protective devices shall be provided within the equipment Use of low voltage blown fuse indicators shall these initial failures. shall be protected against additional or avalanche of failur
20、es due to any of the following con- ditions or failures: All parts of the equipment, including components of the power supply, a. Excessive current overloads and excessive heating resulting from component failure b. An overvoltage resulting from failure of power supply components or regulators c. In
21、advertent misadjustment of internal service adjustments, including misadjustment of power supply regulators d. Incorrect or accidental turn-on or turn-off of equipment 3.4.3.3 Cross-voltage protection. In addition to the fail-safe provisions of 3.4.3.2, the low voltage power supply shall employ circ
22、uitry to prevent damage to the equipment in the event of accidental crossing of the low voltages, regardless of polarity. As a minimum this shall consist of a) reverse power diodes to prevent reversal of any voltage of 30 volts or below and b) circuitry to limit the rise of any voltage of 30 volts o
23、r less to a level which will prevent major damage to low level circuits, particularly integrated circuits. The low voltage power supply shall be capable of sustaining the crossed condition for a minimum of one hour. Extension cords, extender boards, and adapter cables shall be supplied with the equi
24、pment. practicable. de provided for the localization of faults to reasonably small circuit entities which are easily replaceable. 3.4.4 Maintenance design. The equipment shall be designed to provide ease of maintenance. 3.4.4.1 Self-testin * Self-testing techniques shall be employed to the greatest
25、extent 3.4.4.2 Connections for standard test equipment. for such external standard test equipment as may be required for operational Check-out tests. Connections shall be readily available 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-I-2876
26、3C 58 m 7777906 OL5qb74 5 3.4.4.3 Test points and test features. Test points and test features shall be provided. Self-test features and ease of fault isolations shall be emphasized in the equipment design. 3.4.4.4 Captive screws and nuts. feasible, to preclude loss of hardware when equipment is dis
27、assembled for maintenance. 3.4.5 Thermal desi n. ature shall # 3.4.6 Serial numbers, Serial numbers are required for each item to which an identification plate is to be applied. 3.4.6.1 identification plate. 3.4.7 Government loaned property. requested by the contractor in writing (see 6.2 and 6.4) a
28、n AN/UPX-23 Interrogator Set may be furnished on a loan basis to serve as an aid. modular design to provide easily replaceable assemblies and plug-in subassemblies for standard- ization of similar circuits and to facilitate maintenance by rapid substitution. Each assembly and each plug-in subassembl
29、y shall provide a complete circuit function(s) with readily accessible test points at input and output areas. Plug-in subassemblies shall be of the printed circuitry type and shall be removable without requiring the unsoldering of leads. required for the equipment may include, but are not restricted
30、 to, the following: Captive screws and nuts shall be utilized, wherever Forced ventilation to prevent hot spots and reduce internal temper- Identification plates and markings. The IFF Interrogator Set shall carry an When provided for in the contract and specifically 3.4.8 Design and construction. Th
31、e equipment shall employ unitized construction and 3.4.8.1 Electronic assemblies and subassemblies. Major assemblies and subassemblies a. Major assemblies 1. Receiver 2. IF Amplifier 3. Transmitter 4. Power Supply 5. Coder/Synchronizer 1. Mode 4 2. Trigger processor 3. 4. Code generator 5. Trigger a
32、nd modulator driver 6. Video processor 7. Mode gate generator 8. Video separator 9. Gain time control (GTC) 10. Power supply, low voltage 11. Power supply, high voltage 12. Power supply, regulator 13. Power supply, end plate 14. Directional coupler b. Subassemblies Delay line and reset tags 3.4.8.2
33、Chopper sub-assembly. Chopper type power supplies, when used, shall have the chopper sub-assembly designed as a removable module with readily accessible connectors to facilitate maintenance. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.4.13 Se
34、rvice environmental requirements. The equipment shall be capable of continuous operation under any combination of the following service environmental conditions: a. Outside air temperature: Class 2 (-28C to +65“C) b. Relative humidity: O to 95 percent c. Elevation: Sea level to +3658 meters(m) (t12,
35、OOO feet) d. e. Enclosure: Dripproof in accordance with MIL-STD-108 Salt laden air as encountered in a shipboard environment 3.4.13.1 Service operating conditions. In combination with the service environmental requirements, the equipment shall also be simultaneously capable of continuous operation u
36、nder any combination of the following supplementary service operating conditions: a. b. c. d. e. Power supply safety factor (see 3.5.8) RF duty cycle of zero to one percent Standing wave ratio (SWR) of up to 3.5 dB (antenna mismatch), that is, 1.5:l SWR Line voltage variations (see 3.5.8) Primary su
37、pply frequency variations (see 3.5.8) 3. 13.2 Stora e. The equipment shall be capable of satisfactory operation after being stored for a perio + not exceeding one year at storage room ambient temperature ranges from -62C to +75“C. Provided by IHSNot for ResaleNo reproduction or networking permitted
38、without license from IHS-,-,-MIL-I-28763C 58 W 7477706 OL5qb7b 4 9 MIL-E-Z8763C( EC) 3.4.13.3 Standby-to-operate condition. The equipment shall be instantly operable (capable of transmitting if an SIF pretrigger is present) from standby condition at all ambient temperatures specified herein when the
39、 Challenge switch is switched to ON position. nonoperating condition while subjected to an ambient temperature of -28C. 3.4.13.4 Warm-up time. The equipment shall be fully operable within 10 minutes from the 3.4.13.5 Transport requirement. The equipment shall be capable of air transport at altitudes
40、 up to 15,240 m (50,000 feet) without damage, in nonpressurized, nontemperature controlled cargo a i r cr af t , tibility of the equipment shall.conform to the applicable requirements for Class IA, 16, and IC of 3.4.14 Electromagnetic interference. The electromagnetic interference emission and susce
41、p- MIL-STD-461. 3.4.15 Reli abi 1 ity. 3.4.15.1 Quantitative reliability requirement. The specified mean-time-between-failures 3.4.15.2 Equipment conditioning. (MTBF) (Oo as defined by MIL-STD-781) of this equipment shall be 2000 hours. equipment conditioning test, with the environment temperature e
42、qual to or greater than 65“C, with the equipment operating in the worst case mode for a cumulative operating time of 48 hours of failure-free time. Failures occurring during this 48 hours shall be repaired and the burn-in resumed until 48 hours of failure-free time is achieved. than normal operating
43、 mode changes, shall be allowed during this test. The equipment shall be capable of passing a temperature No adjustments of the equipment, other 3.4.16 Maintainability requirements. 3.4.16.1 Quant i tati ve mai ntai nabi 1 i ty requirements. When repair is accompli shed by rep1 ace- ment of subassem
44、blies (module or P.C. boards), the equipment shall have an equipment repair time (ERT) of no greater than 30 minutes. ERT includes localization, isolation, disassembly, inter- change, reassembly, alignment, and checkout for all subassemblies and parts. - 3.4.16.2 Qualitative maintainability requirem
45、ents. The equipment shall be constructed to provide ease of maintenance, accessibility, and replacement of modules and replaceable parts. 3.4.16.3 Plug-in construction. Optimum use shall be made of plug-in construction. 3.4.17 Terminal designation. Terminal identification shall be provided for all i
46、nternal connectors and for all external connectors used to connect units of the equipment to units of another equipment. test points the following shall be considered: 3.4.18 Test points. External, modular, and circuit test points are required. In providing a. b. d. e. f. 9- h. C. Fault location Fau
47、lt isolation Circuit performance Ca 1 i brat i on System alignment Installation and checkout Signal quality Maintenance systems tests Modular test points shall be probe type and located at the top of each module, printed circuit board, or subassembly and shall be easily identifiable and accessible.
48、inputs and outputs are an absolute minimum on all assemblies and subassemblies. Test points for all signal 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-28763C 5 7999706 0354677 O M MIL-I-28763C( EC) 3.4.18.1 Printed circuit boards. Where p
49、lug-in printed wiring boards are employed, they Test shall be in accordance with MIL-STD-275 and shall be readily removable from the chassis. points shall be easily accessible without withdrawing the board from its installed position. Board extenders allowing access to both sides of the board shall be provided to connect the printed circuit board into its normally connected circuitry for servicing purposes. be stored within the equipmen
