1、MIL-C-813LI3C 58 W 7777706 0170201 7 W .- NIL4 -81343C(AS) 1-March 1970 . SUPERSEDING MIL-R-81343B (AS) - .- 1 April 1968 . odular Assemblies - irlien used, Nicroelectronic Modular Assemblies shall meet; the requiie- ments of AR-5. *3;2.3 Modules I - The electronic portions and Connections *3.3.3.1
2、Cables and Connectors - The equipment shall provide for the use of cables and connectors in accordance with Specification MIL-E-5400. Input power connectors shall conform to MIL-C-26482. conform to MIL-C-81511: be capable of satisfactory operation using external wiring in accordance with the applica
3、ble requirements of Specification MIL-W-5088. The external wiring shall be unshielded, except that a minimum number of the individual wires may be shielded when demonstrated as necessary to meet interference control requirements and provided the assembly of the cable to its plugs may be easily accom
4、plished. External cables and that portion of the connectors attached to the cables shall not be supplied as part of the equipment. control panels shall conform to the applicable requirements of Specification MIL-C-6781 except that control panels shall be gray per FED-STD-595 (Color No. 36231) with w
5、hite lights. The configuration of all control panels must be approved by the procuring activity prior to preproduction testing. Interchangeability - The equipment shall meet the interchangeability requirements of Specification Connectors used for digital transmissions shall *3.3.3.2 Interconnection
6、Cabling - The equipment shall . 3.3.4 Control Panels - All rack or console mounted *3.3.5 MIL-E-5400. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-L343C 58 7777706 O370207 T W *3.3.6 Interference Control - The generation of radio interfer
7、ence by the equipment and vulnerability of the equipment to radio interference shall meet the requirements of NR-101, Part I. r3.3.7 Provisions for Maintainability - Built-in . test equipment, construction and packaging, provisions for test points, and other maintainability parameters shall be in ac
8、cordance with the intent of AR-10. *3.3,8 Nomenclature, Nameplates and Identification varking - Nomenclature and serial number assignment, nameplate approval and identification marking shall be in accordance with Specification MIL-N-18307. 3.3.9 Standard Conditions - The following conditions shall b
9、e used to establish normal performance characteristics under standard conditions and for making laboratory bench tests: Temperature Altitude Vibration Humidity Room ambient (25OC I5“C) Normal Ground None Room ambient up to 90% relative humidity Input power voltage 115 k 1.0 VAC, 3 phase, 400 HZ 3.3.
10、10 Service Conditions - The equipment shall operate satisfactorily under any of the environmental service conditions or reasonable combination of these conditions as specified in Specification MIL-E-5400 for Class 1A equipment as modified herein. 3.3.10.1 Vibration - The equipment shall operate sat-
11、 isfactorily when subjected to the vibration requirements of Curve I of Specification MIL-E-5400 or f2g, whichever is less. *3 -3.10.2 Temperature - The equipiiient shall perform satisfactorily when operated within the temperature range of -25OC to +55“C. Degraded performznce will be permitted withi
12、n, the temperature range of -54OC to -25OC, and +55“C to +7loC. 7 - - - . . - _- -. _- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-C-81343C 58 7Ob OL702O I m MIL-R-81343C (AS) 3.3.11 Warm-Up Tiine - The time required .for equip- ment warm-up
13、 shall be kept to a minimum and shall not exceed 3 minutes under standard conditions, and 5 minutes at -25OC. Turn-on capability shall be maintained down to a temperature of 754C with no damage to the equipment. . 3.3.12 II *3.3.12.1 Operating Power - The equipment shall meet . all applicable requir
14、ements of MIL-STD-704 and shall give . specified performance from the following power source with characteristics as defined in MIL-STD-704 having limits as defined herein. The equipment shall operate within the bounds of limits 2 and 3 of Figure 3 of MIL-STD-704, except that the upper operating lim
15、it shall be 130 volts and the lower operat- ing limit shall be 100 volts. Degraded operation may occur when the input voltage exceeds the above limits but remains within limits 1 and 4 of Figure 3 of MIL-STD-704. However, no damage shall be suffered by the equipment and normal opera tio shall automa
16、tically resume upon return of the input voltage to levels wthin the operating limits as defined above. The power , required shall not exceed the following specified amounts: . AC Power - 115 V, Category “B“, 600 V.A.30 r3.3.12.2 Lighting Power - Input power for lighting shall require not more than 0
17、.5 amp at .28 volts. *3.3.12.3 Degraded Performance - Degraded performance will be permitted for voltage transients not exceeding 0.5 second during normal electric system operation. Operation shall return to normal with no resulting damage to the equipment. 3.4 Performance - Unless otherwise specifi
18、ed, values set forth to establish the requirements for satisfactory performance apply to performance under both standard and extreme service conditions. When reduced pergormance under the extreme conditions is acceptable, tolerances or values setting forth 8 Provided by IHSNot for ResaleNo reproduct
19、ion or networking permitted without license from IHS-,-,-MIL-R-81343C (AS) acceptable variations from the performance under the standard conditions will be specified. *3.4.1 Operation - The Radar Scan Converter Group shall convert, offset, and store the outputs of the AN/APS-115 Radar and IFF unit f
20、or presentation on the Multipurpose Display, in response to digital commands from the Data Processing System. . *3.4,2 Registration - When presented on a Multipur- pose Display, the converted video output and the raw video output of the Radar Scan Converter Group shall register within 1% of the usab
21、le diameter. *3.4.3 Resolution - The Radar Scan Converter Group shall be capable of storing and converting a minimum of 200 discernible range rings. 3.5 Detailed Requirements , *3.5.1 Radar Interface Unit MX-7974/ASA-69 - The Radar Interface Unit (RIU) shall meet the following requirements: *3 . 5.1
22、.1 Function - The RIU shall provide the interface necessary to perform the following functions: a. The Radar Interface Unit shall accept video, trigger, and azimuth information from the AN/APS-115 ,and IFF video from the AN/APX-76, and convert these signals to the necessary horizontal and vertical s
23、weeps, video, and unblank signals required for the writing of the radar presenta- tion on the storage tube of Radar Scan Converter CV-2425/ASA-69 and for the display of Raw Radar Video on the MPD. b. The Radar Interface Unit shall accept data from the Digital Output Multiplexer and the Master Timing
24、 Logic, parts of Data Processing System AN/AYA-8, provide the ground stabilization X and Y offset voltages to the radar sweep origin at the write side of the Scan Converter Unit, and execute the commands associated with radar storage and display ,presentat ion. 9 - . - . . . . .- -I - -* - .,- . . .
25、 . . . I. Li Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- NIL-C-813LI3C 58 W 7777906 OL702LO T MIL-R-1343C(AS) *3.5.1.2 Form Factor - The Radar Interface Unit shall be enclosed in a single case which has the following maximum dimensions excluding
26、 connectors, rubber. bumpers , controls, and handles: deep . 18 iwhes wide, 18-5/8 inches high, and 10-1/4 inches 3.5.1.3 Weight - The weight of the Radar Interface Unit shall not exceed 40 pounds. 3.5.1.4 Contents - The Radar Interface Unit shall consist of the circuit assemblies which comprise the
27、 Radar Data Interface and the Ground Stabilization and Command Decoding interface. *3.5.1.4.1 Radar Data Interface - The Radar Data Interface shall contain the circuit assemblies required to perform the following functions. *3.5.1.4.1.1 Sweep Generation - Upon receipt of the radar trigger, fixed and
28、 resolved sawtooth sweep voltages shall be generated. These sweeps shall be.of the proper slope and duration as determined by the selected range scale. circuits shall include an automatic gate shortening capability These which shall provide a fixed roffct time (as required for the recovery of the Sc
29、an Converter Unit circuits) and prevent a count down of the PRF for the longer gate periods and the a 91 ohm input impedance and be capable of accepting signals . between 5 and 10 volts. higher PRF. The radar trigger interface circuits shall have *3.5.1.4.1.1.1 Resolved Sweeps - The bearing angle of
30、 the Horizontal and Vertical resolved PPI sweeps shall be within fi degree of the angle of the 3 wire synchro, 11.8 volt maximum, antenna bearing input, shall be capable of following a 12 RPM inputwith a velocity error of less than 1/4 degree, shall be capable of sector scanning at rates correspondi
31、ng to 12 RPM and shall have no greater than 20 percent overshoot for a given input step function. The Horizontal and Vertical sweep 10 / - - * , - - -* - .- - _.- - _- -.- I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1i , -_ MIL-C-I343C SB 77779
32、06 0170211 I W MIL-R-Sl343C (AS) , outputs shall have a fixed baseline, a sweep Xiiiearity of less than f0.5% of maximum range and circularity of less than . *3.5.1.4.1.2 Output Line Drivers - Line Drivers shall provide the necessary amplification for the horizontal and vertical sweep signals to dri
33、ve both the Scan Converter Unit . Write Deflection Amplifiers and the MPD Deflection Amplifiers, the latter via the multiplexing circuits. *3.5.1.4.1.3 Video Processing - These circuits shall . accept and.mix video signals from both the radar and IFF units and calibrated range marks from an internal
34、 generator and shall provide gain compensation for the video such that,for a given signal level, the intensity of the output video from 6 the Scan Converter.Unit,as seen on the display, is constant irrespective of the radial distance from the center of the radar display, the radar sweep speed and PR
35、F. gain level (range dependent), the linearity of the video amplification shall be k5 percent. The video amplifier shall have a minimum bandwidth of 5 megacycles and a maximum of one db droop at a 1500 microsecond pulse width. At any given The output of this circuit shall be capable of driving a 91
36、ohm terminated , line. The Range Mark Generator shall be capable .of generating calibrated range-marks. The distance between the range marks shall be such that all selectable range scales shall be easily calibrated. The range circles to appear for . the selectable ranges are as shown below. Range (M
37、iles) Range Circle Radius (Miles) 8 4 16 32 64 128 4 8 8 16 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-C-3343C 5 m 7999906 O370232 3 m Ai I L-R- 8 13 43 C (AS) The accuracy of these range circles shaJ.1 be k0.5 percent of the distance o
38、ut froni the center of the circle. *3.5.1.4.1,4 Unblank Gate Generation - An unblank gate shall be generated of the proper duration as determined by the selected range scale. This signal shall be supplied as outputs to the Scan Converter Unit write unblank circuits and the MPD unblank circuits. This
39、 signal shall also be used by the multiplexing circuits in the “A-Scanft mode. This signal shall be inhibited when Write Radar is not selected, and ,during update of the ground stabilization voltages. *3.5.1.4.1.5 Multiplexing - In the raw radar processing function, the RIU shall contain multiplexin
40、g switches for selecting either PPI or “A-Scan“ radar video presentat ion o The selection shall be accomplished manually in the test mode or through computer word in the ON-LINE mode. outputs to the hlPD shall be as follows: The multiplexed OUTPUT TO MPD PPI MODE “A“ SCAN MODE X Deflection . Horizon
41、tal Sweep Sweep Generator Output Y Deflection Vertical Sweep APS- 11 5/IFF Video Video APS-llS/IFF Video Write Unblank Unbl a nk Write Unblank Write Unblank Each of the multiplexing switches of the RIU shall have the following electrical characteristics: crosstalk isolation between PPI- and “A-scan“
42、 multiplexing 40 db of switches, and switching speed of not more than 12 microseconds to within 0.1 percent of full scale, * The X and Y output drivers shall have characteristics as per 3.5.1.4.1.1 and 3.5.1,4.1.1.1: The video amplifier shallhave characteristics as per 3.5.1.4.1.3. The unblank ampli
43、fier shall have characteristics as per 3.5.1.4.1.4. 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-3343C 58 W 7977706 0370233 5 W hi1 L-R- 8 13 43 C(AS) *3.5.1.4.1.6 Read Enable Generation - In the On-Line Mode, - the RIU shall accept a Rea
44、d Enable Gate from the hIaster Timing Logic (hiTL) NIL-D-81347 and shall generate a positive 4 k 1 volt gate of the same width as the input and synchronous with it. In the Test Mode, these circuits shall generate an enable gate, synchronous with the 400 cycle power source, at a frequency of 40 Hz. *
45、3.5,1.4.1,7 Differential Amplifiers - The Radar Trigger, Read Enable, Radar Video, and IFF Video inputs shall be terminated at the RIU with differential amplifiers. These amplifiers shall provide grounding isolation between the RIU and the aforementioned transmitting sources, and must be capable of
46、tolerating a voltage difference of at least f4 volts DC between the triax inner connector shield and the airframe. The input impedance of these amplifiers shall be 90 to 95 ohms and 100 pf maximum. r3.5.1.4.2 Ground Stabilization and Command Decoding Interface - The Ground Stabilization and Command
47、Decoding Interface shall contain the circuit assemblies required to perform the following functions. *3.5.1.4.2.1 Input Register and Decoding - The RIU shall interface directly with an output channel of the Digital Output Multiplexer (DOM) as per 3.5.1.1 (b). The RIU shall contain input amplifiers a
48、s per Appendix I, temporary storage for both ground stabilization and command data, and decoding to provide proper gating of data to the correct circuit assembly. The Digital Output Multiplexer shall transmit data words to the RIU as per Figure 1, with the timing constraints and voltage levels as pe
49、r Figure 2. Data shall always be present at the Input Amplifie when a “Channel OutputAcknowledge“ signal is present at the RIU. The “Mode code1 portion of the data word shall determine the content of the data word as follows: however, this data shall be sampled only 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I M
