1、MIL-N-81857(AS) 24 OCTOBER 1972 MILITARY SPECIFICATION NAVIGATIONAL SET, TACAN AN/AtN-105 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 specification shall, when installed in aircraft, provide bearing,
2、 distance and tone identity information to indicate the location of a complementary surface station with respect to the aircraft. The equipment shall also provide, as a discrete auxiliary function, information to indicate the link distance with respect to a similarly equipped aircraft. This equipmen
3、t is the airborne portion of the short range air navigation system known as TACAN (Tactical Air Navigation). 1.2 Classification - The equipment covered by this speci- fication shall consist of the following items: Type Designation RT- 10 3 O/ARN- 1 O 5 C -2 O 1 O/ARN- 5 2 (VI or C-20 lOA/ARN-52(V) o
4、r C-3928(P)/ARN-520 or C -7 893( P)/ARN-52 (V) C -7 7 12/ARN- 5 2 (V) MT- 2 O 9 1/ARN- 6 5 Applicable Paragraph 3.5.1 3.5.2 3.5.3 3.5.3.7 3.5.3.8 3.5.3.9 3.5.4, 1.3 Associated Equipment - This equipment shall operate with the associated equipment listed in 6.7. 2. APPLICABLE DOCUMENTS 2.1 General -
5、The following documents of the issue in effect on the date of invitation for bids form a part of this speci- fication to the extent specified herein. 1 FSC5826 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-81857 9799906 2085963 408 m MIL-N-81
6、857 SPECIFICATIONS MIL-(2-172 Cases, Bases, Mounting; and Mounts, Vibration (for use with Electronic Equipment in Aircraft) MIL- W-5 088 Wiring; Aircraft, installation of MIL-E-5400 E lec tronic Equipment , Aircraft, General Specification for MIL-T-5422 Testing, Environmental, Aircraft Electronic Eq
7、uipment MIL-1-6181 Interference Control Requirements Aircraft Equipment MIL-P-7788 Plate, Plastic, Lighting MIL-M-7 79 3 Meter, Time Totalizing MIL-1-9229 Indicator, Course ID-387/ARN MIL-E-17 555 Electronic, and Electrical Equipment and Associated Repair Parts, Preparation for Delivery of MIL-T-183
8、03 Test Procedures, Preproduction and Inspection for Aircraft Electronic Equipment, format for MIL-N-18307 Nomenclature and Nameplates for Aeronautical Electronic and Associated Equipment. MIL-E-19600 Electronic Modules, General Specifications for MIL-1-22075 Indicator, Bearing-Distance-Heading: ID
9、- 6 6 3/U 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-81857 MIL-C-5824 MIL-C-6781 MIL-I- 18955 MIL-A-25708 MIL-1-23366 MIL-S-25879 MIL-1-27848 MIL-1-2 5 999 MIL-E-5272 MIL-H-26689 9999906 20859b4 344 E Co ur s e In dica t o r ID - 2 5 OMA
10、RN Control Panel; Aircraft Equipment, Rack or Console Mounted Indic at o r , Rang e ID - 3 8 WARN Antenna AT-741/A Horizontal Situation Indicator ID- 1 O 13/A Switch, Radio Frequency Trans- mission Line SA-521/A Horizontal Situation Indicator AQU-4/A Indicator, Bearing, Distance Heading ID-526A Envi
11、ronmental Testing, Aeronautical and Associated Equipment, General Specification for Horizontal Situation Indicator AQU-B/A Naval Air Systems Command AR- 5 AR- 10 AR-34 Microelectronic Devices Used in Avionics E quip m e n t , Pro ce dur e s for Selection and Approval of. Maintainability of Avionics
12、Equipment and Systems, General Requirements for. Failure Classification for Reliability Testing, General Requirements for 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-N-81857 MIL-N-81857(AS) STANDARDS MIL-STD-287 MIL-STD-29 1 MIL-STD-704 MIL
13、-STD-794 MIL-STD-785 MIL-STD-781 MIL-STD-810 = 999990b 20859b5 280 Test Signals for Electronic Tactical Air Navigation Equipment (TACAN) Standard Tactical Air Navigation (TACAN) Signal Electric Power, Aircraft, Charac- teristics and Utilization of. Parts it shall detect and decode bearing, distance
14、and identity data, and convert the data into signals for operation of any combination of: (1) Three (3) Bearing-Distance - Heading Indic at ors , ID - 6 6 3/U, or e le c t ri c al equivalent, connected in parallel, (2) Three (3) Course (Deviation) Indicators, ID-38 /ARN or electrical equivalent. (3)
15、 Three (3) Range Indicators, ID-388/APN, vice tlie distance portion of the ID-663KJ. The receiver-transmitter shall also transpond to the interrogation pulses of similarly equipped aircraft. It shall transmit single pulse replies to as many as five such interrogating aircraft provided their signal s
16、trengths are within 12 db of each other at the receiver input terminal. 3.5.1.2 Form Factor - The form factor of the RT-1030/ ARN-105 receiver-transmitter shall be as shown in Figure 1. 3.5.1.3 Weight - The weight of the receiver-transmitter shall not exceed 48.0 pounds. 3.5.1.4 Contents - The recei
17、ver-transmitter unit shall consist of a base assembly and the following modules. Each module shall conform to the provisions of Specification MIL-E-19600. The classification designations shall be A45Y3. However, the alti- tude denoted by the digit “3“ shall be 70,000 feet. (1) RF Module - 4-112 inch
18、es x 6 inches x 12 inches The RF module shall contain a resistance bridge controlled servo system which drives a turret containing 126 crystals (one for each channel) and which tunes the prese- lector, frequency multiplier and transmitter. This module shall also contain the prese- lector, double con
19、version i-f amplifier, high-voltage power supply, modulator, frequency multiplier, and transmitter“ subassemblies. . . .contd. 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-81857 = 9997706 2085985 079 m 3.5.1.4 (1) (continued) The transmit
20、ter power amplifier stages shall be cathode modulated and each cavity shall be individually gasket scaled to main- tain rated power at an altitude of 70,000 feet. (2) Range Decoder Module - 4-112 inches x 4U2 inches x 2 inches The Range Decoder module shall contain the coincidence decoder circuit, t
21、he low impedance AGC generator, aural identifi- cation circuitry and a 4.0457 KHz crystal oscillator. (3) it shall also provide for manual selection of the REC, T/R and NA modes of operation. 28 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-N-8
22、1857 9999906 2085990 43b MIL-N-8 1857(AS) 3.5.2.1 (continued) (2) It shall provide for manual selection of and one of 126 channels assigned to the receiver-transmitter. (3) It shall provide for manual control of the volume of the aural tone of the beacon identification. 3.5.2.2 h Factor - The form f
23、actor O1 Control C-2010/ ARN-52(1;) shall be as shown in Figure 2. 3.5.2.3 Weigu - The weight of the control unit shall not exceed 2 pounds. 3.5.2.4 Content& - The control unit shall contain the following: Function Selector Switch Channel Selector Switch Ideniity Tone Output Control Panel. Lights Ch
24、annel Servo Bridge Circuits Connector MS3102A-20-27S 3.5.2.5 - The Control unit shall provide the following controls: 3.5.2.5.1 Function Selector - The function selector shall be a four position rotary switch to provide selection of the operating functions which shall be marked OFF, REC, T/R, and NA
25、, respec- tively in a clockwise order. The selector switch shall control the receiver-transmitter as follows: (1) In the OFF position, all primary power to the receiver-transmitter shall be off. (2) In the REC position, the receiver-transmitter shall be energized, allowing the receiver por- tion of
26、the unit to operate for bearing and identity tone functions on any channel. 29 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5.2.5.1 (continued) (3) In the T/R position, the transmittcr portion of the unit will also be energizcd and in addi- tion
27、 to bearing and identity tone functions will allow the transmission of interrogation pulses to the ground beacon and receive the distance response pulse from the beacon as distance information. (4) In the NA position, the receiver-transmitter shall be energized and perform as a trans- ponder for dis
28、tance information between cooperating a.ircrafts. The bearing circuits shall he inactive in this mode. 3.5.2.5.2 -el Sebctor - The channel selector shall consist of two rotary switches on concentric shafts. The switch on the inner shaft shall contain 10 positions and shall effect a digital readout o
29、f zero 10 nine respectively as the switch is moved clock- wise through its range. The switch on the outer shaft shall contain 13 positions and shall effect a digital readout of onc to twelve as the switch is moved clockwise from its second position to its thir- teenth position respectively. There sh
30、all be no readout in the most counterclockwise position. The digit displayed by the inner control shall appear immediately below tile number displayed by the outer control. When the number displayed by the outer control contains two digits, the number shall be displayed vertically so that the second
31、 digit is immediately below the first digit. The channel selector shall be marked CHAN immediately above the switch knobs. 3.5.2.5.3 Identity Tone Output Control - The identity tone output level shall be controlled by a potentiometer assembly which shall provide continuous variation of the audio out
32、put level, approximately linearly in db per degree of control rotation, over a range of attenuation from 60 db to a minimum of not more than 0.5 db. A clockwise rotation shall effect an increase in output level. The control shall be marked VOL between the forward and rear portions of a clockwise arrow broken in the middle to accom- modate the letters. 30 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
