1、MIL-A-28737A( EC) Pata which may be of use in improving this document should be addreseed to: Cornander, Naval Electronic Systems Command, Washington, D.C. 20360 by using the eelf-addreeeed Standardization Document Improvement Proposai (DD Form 1426) appearing at the end of this document or by lette
2、r. MIL-A-28737( EC) 3 April 1970 MILITARY SPECIFICATION (1.8 METERS (6 FEET) ANTENNA, IFF, AS-2188( ) (3METERS) (10FEET) ) , AS-2189 This specifisation is approved for use by the Naval Electronic Systems Comnand. Department of the Navy, and is available for use by all Departments and Agencies of the
3、 Department of Defense. 1 1. SCOPE 1.1 This specification IFF, AS-2189 (1.8 meters (6 capability, for installation Antenna, whose halves may be Radi ator. 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The following documents of the issue in effect on date of invitation for bids or request for pro
4、posal, form a part of this specification to the extent specified herein. SPEC I FI CAT I ON S FE DE RAL QQ-P-416 - Plating, Cadmium (Electrodeposited) MIL-C-17/74 - Cable, Radio Frequency, Coaxial MI L - S - 901 - Shock Tests, ti. I. (HIGH-IMPACT), Shipboard Machinery, Equipment and Systems, Require
5、ments for MIL-E-16400 - Electronic Interior Cornunication and Navigation Equipment, Naval Ship and Shore, General Specification Far MIL-E-17555 - Electronic and Electrical Equipment, Accessories, and Repair Parts, Packaging and Packing of MIL I TARY STANDARDS MILITARY MIL-STD-105 - Sampling Procedur
6、es and Tables for Inspection by Attributes MIL-STD-108 MIL-STD-109 - Quality Assurance Terms and Definitions MIL-STD-167 -Mechanical Vibrations of Shipboard Equipment. MIL-STD-454 MIL-STD-810 - Environmental Test Methods - Definitions of and Basic Requirements for Enclosures for Electric and Electro
7、nic Equipment - Standard General Requirements for Electronic Equipment PUBLICATIONS MIL I TARY MIL-HDBK-216 - RF Transmission Lines and Fittings (Copies of specifications, standards, drawings and publications required by contractors in connection with specific procurement functions should be obtaine
8、d from the procuring activity or as directed by the contracting officer.) FSC 5985 Licensed by Information Handling ServicesMIL-A-28737A 59 I 79777Ob 04Lb347 8 E MIL-A-28737A (EC) 2.2 Other publications, The following document forms a part of this specification to the extent specified herein. Unless
9、 otherwise indicated, the issue in effect on date of invitation for bids or request for proposals shall apply. NATIONAL BUREAU OF STANDARDS (Application for copies should be addressed to the Superintendent of Documents, U.S. 3. REQUIREMENTS 3.1 General. The equipment shall be in accordance with the
10、requirements of MIL-E-16400 Handbook H28 - Screw-Thread Standards for Federal Services. Government Printing Office, Washingtoh, D.C. 20402.) except as hereinafter specified. with Handbook H28 (NBS). units for first article inspection and approval (see 4.3 and 6.3). Screw threads and screw thread dev
11、ices shall be in accordance 3.2 First article sample. 3.3 Reliability When specified (see 6.2), the contractor shall furnish sample 3.3.1 Quantitative reliability requirement. The equipment shall be designed to have a minimum acceptable mean-time-between-failure (MTBF) of 10,000 hours. 3.4 Design re
12、quirements. 3.4.1 Construction. The requirements of modular construction in MIL-E-16400 are not applicable. to prevent internal accumulation of water or moisture that would adversely affect the RF performance. lhe antenna shall be constructed as ne unit. The equipment shall be constructed 3.4.2 Envi
13、 ronmental servi ce conditions . 3.4.2.1 lem erature. The equipment shall be designed to meet the Range 2 temperature requirements ohO, except that the upper limit shall be 150C (302F). The contractor shall test the operation of the antenna at this temperature. The equipment shall be capable of with
14、standing the effects of the salt fog test specidein. After completion of the test and cleaning, the base metal of the antenna shall not be visible through the finish, nor shall there be any evidence of blistering, softening, separation from the base metal, corrosion products, or other coating failur
15、e. equipment shall maintain the specified performance after completion of the salt fog test. 3.4.2.2 Salt fo . The 3.4.2.3 Hydrostatic .pressure. 3.4.3 Electrical design. Hydrostat i c pressure is not appl icable. 3.4.3.1 The radio frequency (RF) system of this equipment shall be capable of carrying
16、 pulses of RF energy of 10 kilowatts (kw) peak power at one percent duty cycle without breakdown, under service conditions. 3.4.3.2 Overload protection is not required. 3.4.3.3 Connectors and cables. RF type N connectors shall be used in this equipment and shall be selected from MIL-HDBK-216 . Cable
17、s shall be in accordance with MIL-C-l7/74. 3.4.3.4 RF feed s stem. The antennas shall have two RF input connectors to implement inter- rogation side bon. When fed from one input, a “sum“ radiation pattern shall be generated, When using the “difference“ input, a portion of the signal shall be routed
18、from the “difference“ input to the backfill radiator via a directional coupler, sufficient to exceed the “sum“ pattern back lobe by at least 4.0 decibels (dB). When fed from the other input, a Itdifference“ pattern shall be generated. 2 Licensed by Information Handling ServicesMIL-A-2B737A 59 m 9999
19、906 0416348 T MIL-A-28737A (EC) I 3.4.4 Maintenance. 3.4.4.1 3.4.5 Mechanical. Test points and test features are not required 3.4.5.1 3.4.5.1.1 The vibration requirements shall be Type I of MIL-STD-167. 3.4.5.1.1.1 The inclination requirements are not applicable. Shock requirements shall be for Grad
20、e A, Class I, .ightweight. Type A O MIL-S-901. 3.4.5.2 Exposure. 3.4.5.3 Materials and protection. 3.4.5.3.1 Hardware. All hardware shall be CRES 300 series, cadmium plated in accordance 3.4.5.3.2 Painting, undercoats. Except where application would degrade antenna performance, The equipment shall b
21、e designed to withstand the conditions incident to its exposed location on Naval vessels, and shall be watertight. with QQ-P-416, Typeclass 3. B all exterior surfaces of the antenna and its coaxial conductors shall be spray-painted prior to assembly with the following, or its equivalent: Coat i ng D
22、ry Film Thickness Ist coat: Devran 201 Lt. Green 2-3 mils 2nd coat: Devran 201 Buff 2-3 mils 3rd coat: Devran 209 Haze Gray No. 27 2-3 mils Three coats shall be applied to each part unless otherwise specified. 3.4.5.3.3 Painting, finish. After assembly and testing, the complete antenna assembly shal
23、l be spray-painted with one coat (2-3 mil thickness) of Devran 209 Haze Gray No. 27, except where application will degrade antenna performance. 3.5 Electrical requirements 3.5.1 AS-2188 ( ) antenna. The AS-2188 ( ) antenna shall have the following electrical characteristics over the frequency range
24、of 1030 10 megahertz (MHz) when energized through the feed system and pedestal: (a) Vertical polarization. (b) A mean impedance of 51 ohms nominal (both inputs). (c) (d) Gain of at lease 18.5 dE referenced to an isotropic radiator. (e) A voltage standing wave ratio not greater than 3.6-dB at the inp
25、ut terminals to the antenna. A horizontal sum pattern with main lobe beam width of not more than 7.3 degrees at 3 dB below maximum and not more than 20 degrees at 20 dB below maximum of the main lobe. Maximum of the side lobes shall be at least 26 dB below the maximum of the main lobe, and the maxim
26、um of the back lobe shall be at least 26 dB below the maximum of the main lobe, (f) The horizontal “difference pattern shall cover all side lobes and back lobes by at least 4.0 dB. The depth of the hull at O“ (the “sum“ pattern main beam) shall be at least 30 dB below the “sum“ pattern main beam max
27、imum point. The “difference“ pattern shall be designed to obtain the greatest degree of “beam“ sharpening“ possible. 3 Licensed by Information Handling ServicesI (9) The antenna shall have a vertical sum pattern as follows: (1) Total beam width, as measured at the points 3 dB down from the peak of t
28、he main beam, of at east 50“. (2) At 40 and -20“ elevation, no more than 5 dB down from the peak of the main beam. 3 At t60“ elevation, no more than 12 dB down from the peak of the main beam. . 4 At +90“ elevation, at least 18 dB down from the peak of the main beam. (5) At k145 elevation, at least 3
29、0 dB down from the peak of the main beam. At -80“ elevation, at least 24 dB down from the peak of the main beam. From t150“ through +180“ -130“, elevation, the back lobe shall be at least 30 dB below the peak of the main beam. 3.5.1.1 3.5.2 AS-2189 antenna. The antennas shall be designed for optimum
30、 performance at 1030 MHz and at 1090 MHi. The AS-2189 antenna shall have the following electrical character- istics over the frequency range of 1030 10 and 1090 +lo MHz when energized through the feed system and pedestal : (a) Vertical polarization. (b) A mean impedance of 51 ohms (both inputs). (c)
31、 A power standing wave ratio not greater than 3.5 dB at the input terminal to the antenna, (d) Gain of at least 16.5 dB referenced to an isotropic radiator. (e) A horizontal “sum“ pattern with main lobe beam width of no more than 11 degrees at 3 dB below maximum, and no more than 25 degrees at 20 dB
32、 below maximum of main lobe. Maximum of the side lobes shall be at least 26 dB below the maximum of the main lobe, and the maximum back lobe shall be at least 30 dB below the main lobe. The horizontal “difference pattern“ shall cover all side lobes and back lobes by at least 4.0 dB. The depth of the
33、 null at O“ (the “sum“ pattern main beam) shall be at leest 30 dB below the “sum“ pattern main beam maximum point. pattern shall be designed to obtain the greatest degree of “beam sharpening“ possible. (9) The antenna shall have a vertical sum pattern as follows: (1) (2) (3) (4) (7) I (f) The ;diffe
34、rence“ Total beam width, as measured at the points 3 dB down from the peak of the main beam, of at least 50“. At +40“ and -20“ elevation, no more than 5 dB down from the peak of the main beam. At t60“ elevation, no more than 12 dB down from the peak of the main beam. At 90“ elevation. at least 18 dB
35、 down from the peak of the main beam. From +150“ through +180“ to -130“, elevation, back lobe shall be at least 30 dB below the peak of the main beam. At 2145“ elevation, at least 30 dB down from the peak of the main beam. At -80“ elevation, at least 24 dB down from the peak of the main beam. 3.6 De
36、sign requirements. 3.6.1 The design of the antenna shall be such that when It is not mounted it shall be possible to feed the antenna directly by coaxial cables through RF connectors, as described in 3.4.3.4. The electrical characteristics of the antenna and feed system shall not be adversely affect
37、ed when the antenna is fed in this manner. 3.6.1.1 The RF coupling and mechanical mounting provisions for mounting the antenna on the pedestal shall be such that the antenna can, without modification, be mounted on the AN/UPA-57 pedestal and on the pedestal for the AN/UPA-22 antenna system, as shown
38、 in figure 1. backfill radiator, and a backfill radiator to implement ISLS operation. directional coupler shall comprise the Hybrid Assembly, which shall be made integral with the antenna, uti 1 iz ing stripline techniques. 3.6.2 Both antennas shall incorporate a hybrid duplexer with a directional c
39、oupler for the The hybrid duplexer and 4 Licensed by Information Handling ServicesMIL-A-28737A 57 = 7797706 0436350 8 W MIL-A-28737A( EC) 3.6.2.1 Hybrid duplexer. The hybrid duplexer shall be capable of operation with the RF pulses specified in 3.4.3.1 and having the following characteristics: Power
40、 - 10 kw at 1.0 percent duty cycle. Frequency - 1030 010 and 1090 20.1 microsecond (usec). Width - 0.8 a.l mec and 0.50 20.1 (risec). Rise time - 0.10 risec or less. Decay time - 0.15 uset or less. Impedance - 51 +2 ohms. Power balance - 0.4 dB or less. Phase tolerance - Sum O SI degrees. (a) (b) (c
41、) (d) (e) (f) (9) Minimum separation, leading edge 1.0 20.1 risec. (h) (i) 3.6.2.2 Directional coupler. A coupler incorporating a 6 21 dB attenuation shall be provided as an integral part ot the nytwid assembly. connector. The six dB coupler shall have a characteristic impedance of 51 22 ohms. The b
42、ase shall be basically a one-piece construction, symnetrical about the antenna center-line, and extending to the center of each moment arm of the antenna. Two sets of mounting holes, spaced as shown in figure 2 shall be provided. The design of the antenna shall be such that it will be possible to mo
43、unt the antenna on a radar antenna structure when proper mounting fixtures are provided. specification), no larger than 26 cm X 15.5 cm X 3.9 cm (10 inches X 6 inches X 1 1/2 inches) and weighing no more than 2.3 kg (5 pounds). design agency. 3.6.4 The size of the AS-2188 ( ) antenna shall not excee
44、d 300 cm (112 inches) in length by 48.5 cm (19 inches) in height, and the size of the AS-2189( ) antenna shall not exceed 190 cm (74 inches) in length and 48.5 cm (19 inches) in height. structure shall be a minimum consistent with good design practices and subject to the approval of the comnand or a
45、gency concerned. the weight of the AS-2189( ) antenna assembly 25 kg (64 pounds). Feed to the backfill antenna shall be via a Type N/HN 3.6.3 The antenna base and mount assembly shall be an integral part of the antenna. Mounting provision shall be made on the antenna for an RF Switch (not part of th
46、is The location chosen shall require the approval of the The depth of the array including bracing 3.6.5 The weight of the AS-2188( ) antenna assembly shall not exceed 33.5 kg (74 pounds) and 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract
47、, the contractor is responsible tor the pertormance of all inspection requirements as specified herein. otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the
48、Government. in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Government verification. will be subject to tiovernment veritication at any time. lance of the operations to determine that description are being pro
49、perly applied, (by G overnment product inspection to measure quality of product to be offered for acceptance, and (c) Government product inspection of delivered product to assure compliance with all requirements of this specification. Failure of the contractor to promptly correct deficiencies discovered by him or of which he is notified shall be cause for suspension until corrective action has been made or until conformance of product to prescribed criteria has been demonstrated. Except as The Government reserves the right to perform any of the inspections set forth All qua
