1、XI MIL-A-28772C 57 7777906 003330b 7 0: MIL-A-28772C( EC) 19 June 1984 SUPERSEDING MIL-A-28772B( EC) 10 July 1981 MILITARY SPECIFICATION ANTENNA, HIGH FREQUENCY (HF) FIXED ROTATABLE LOG PERIODIC This specification is approved for use by the Naval Electronic Systems Command, Department of the Navy, a
2、nd is available for use by all Departments and Agencies of the Department of Defense, 1. SCOPE 1.1 Scope. This specification covers the high frequency (HF) rotatable log periodic antenna (RLPAJ , hereinafter referred to as the antenna, to transmi or receive communications, or both, for use at NavaT
3、shore communications stations. 1.2 Classification. Antennas shall be of the following types, as specified (see 6.2): Type I: Type IL: One kilowatt (kW) average; 2 kW peak envelope power (PEP) 25 kW average; 50 kW, PEP 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standar
4、ds. Unless otherwise specified, the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extertt specified herein, SPEC I FI CAT IONS
5、 FEDERAL w-c-375 CC-M-1807 QQ-A-200/8 QQ-A-200/9 QQ-A-200/16 QQ-A-250/11 RR-W-410 Wire Rope And Strand TT-P-641 Circuit Breakers, Molded Case, Branch Circuit And Service Motors, Alternating Current, Fractional And IntegraT Horse- power (500 HP And Smaller) Aluminum Alloy 6061, Bar, Rod, Shapes, Tube
6、 And Wire, Extruded Aluminum Alloy, 6063, Bar, Rod, Shapes, Tube And Wire, Extruded Al uminum Al loy Bar Structural Shapes, Extruded, 6061 Aluminum Alloy 6061, Plate And Sheet Primer Coating; Zinc Dust-Zinc Oxide (For Galvanized Surfaces) MILITARY MIL-I -10 Insulating Compound, Electrical, Ceramic,
7、Class L MIL-P-116 Preservation, Methods Of MIL-C-8514 eating Compound, Metal Pretreatment , Resin-Acid . MIL-M-13231 Marking Of Electronic Items DoD-P-15328 Primer (Wash) , Pretreatment (Formula No. 117 For Metals) (Metric ) MIL-C-16173 Corrosion Preventive Compound, Solvent Cutback, Cold-Applicatio
8、n MIL-E-16400 Electronic, Interior Communication And Navigation Equipment, Naval Ship And Shore: MIL-E-17555 Electronic And Electrical Equipment, Accessories, And Repair Parts, Packaging And Packing Of DoD-P-21035 Paint,-High Zinc Dust Content, Galvanizing Repair (Metric) MI L -A- 2 1180 Aluminum-Al
9、loy Castings, High Strength MIL-S-23196 Steel Plate, Sheet And Strip, Corrosion Resistant MIL-F-24044 Flanges, Coaxial Line, Rigid Air Dielectric, General Specification For General Specification For Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of us
10、e in improving this document should be addressed to: Command (ELEX-8111), Washington, DC 20363, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter. Commander, Naval Electronic Systems , / THIS DOCUMENT CONTAINS
11、 33 PAGES * FSC 5985 -. .- Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-28772C 57 W 7797706 0033307 7 MIL-T-28732 MIL-C-28777 MIL-S-38228 MIL-A-40147 MIL-A-46106 MIL-H-46855 STAN DARDS FEDERAL FED-STD-595 MI LI TARY MIL-STD-12 MIL-STD-108
12、MIL-STD-109 MIL-STD-129 MIL-STD-188 MIL-STD-415 MIL-STD-454 MIL-STD-461 MIL-STD-462 MIL-STD-471 MI L-STD- 781 MI L-STD-810C MIL- STD- 965 MI L-STD- 1364 MIL-STO-1472 MIL-A-28772C( EC) Transformer, Impedance Matching (Balun) Cable Assembly, Electronic Test Equipment, (3 Wires, 125 And 250 Volts AC An
13、d 28 Volts DC) Grounding Plug Connector, General Specification For Sealing Compound, Environmental, For Aircraft Surfaces Aluminum Coating (Hot-Dip) For Ferrous Parts Adhesive Sealants, Sil icone, Rtv, General Purpose Human Engineering Requirements For Military Systems, Equipment And Facilities Colo
14、rs Abbreviations For Use On Drawings, And In Specifications, Standards And Technical Documents Definitions Of And Basic Requirements For Enclosures For Electric And Electronic Equipment Quality Assurance Terms And Definitions Marking For Shipment And Storage Military Communication System Technical S
15、tandards Test Provisions For Electronic Systems And Associated, Equipment, Design Criteria For Standard General Requirements For Electronic Equipment Electromagnetic Emission And Susceptibility Requirements For The Control Of Electromagnetic Interference Electromagnetic Interference Characteristics,
16、 Measurement Of Maintainability Verification/Demonstration/Evaluation Reliability Design Qualification And Production .Acceptance Tests: Exponential Distribution Environmental Test Methods Parts Control Program Standard General Purpose Electronic Test Equipment Human Engineering Design Criteria For
17、Military Systems, Equipment And Facilities 2.1.2 Other Government publ ications. The following other Government publ ications form a part of this specification to the extent specified herein. PUBLICATIONS FEDERAL AVIATION ADMINISTRATION (FAA) FAA-AC 70/7460-1 Obstruction Marking And Lighting NAVAL F
18、ACILITIES ENGINEERING CENTER (NAVFAC) NAVFAC DM-2.2 Design Manual, Structural Engineering Loads NAVFAC DM-4 Electrical Engineering (Copies of specifications, standards, and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contractin
19、g activity or as directed by the contracting officer.) the extent specified herein. The issues of the documents which are indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. 2.2 Other publications. The following documents form a part of
20、 this specification to 2 c .- e Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I- MIL-A-28772C 57 m 7977706 0033308 O m MIL-A-28772C( EC) AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AIX) Design, Fabrication, And Erection Of Structural Steel For Buildi
21、ngs (Application for copies should be addressed to the American Institute of Steel Construction, Inc., 101 Park Avenue, New York, NY 10017.) I AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE) Proceedings, December 1962, Papers No. 3341 And 3342: For Structures Of Aluminum Alloys 606L-T6 And 6062-T6, And S
22、uggested Specifications For Structures Of Aluminum Alloys 6063-T5 And 6063-T6. Suggested Specifications (Application for copies should be addressed to the American Society of Civil Engineers, 345 East 47th Street, New York, NY 10017.) 6 ELECTRONIC INDUSTRIES ASSOCIATION (EIA) RS-222C Structural Stan
23、dards For Steel Antenna Towers And Antenna RS-310C-77 Supporting Structures Racks, Panels And Associated Equipment (Application for copies should be addressed to the Electronic Industries Association, 20006.) 2001 Eye Street, Nit, Washington, DC AMERICAN SOCIETY OF TESTING MATERIALS (ASTM) A36 A123
24、A153 A325 A475 6233 6260 6285 6398 8415 6416 D2303 Specification For Structural Steel Zinc (Hot-Galvanized) Coatings On Products Fabricated From Rolled, Pressed And Forged Steel Shapes, Plates, Bars, And Strip Zinc Coating (Hot Dip) On Iron And Steel Hardware High Strength Bolts For StructuraT Steel
25、 Joints Including Suitable Nuts And Plain Hardened Washers Zinc-Coated Steel Wire Strand (Galvanized And Class A (Extra Galvanized) ) Rolled Aluminum Rods, (EC Grade) For Electrical Purposes Aluminum Alloy Brazing Filler Metal Aluminum Alloy And Aluminurn Alloy Welding Rods And Bare Elect rodes Spec
26、ification For Aluminum Alloy 6201-T81 Wire For Electrical Purposes Hard-Drawn Aluminum Clad Steel Wire Concentric-Lay-Stranded Aluminum-Clad Steel Conductors Test For Liquid-Contaminant, Inclined Plane Tracking And Erosion Of Insulation Materials (Application for copies should be addressed to the Am
27、erican Society for Testing Materials, 1916 Race Street, Philadelphia, PA 19103.) NATLONAL FIRE PROTECTION ASSOCIATION (NFPA) NFPA 70-1983 National Electrical Code (Application for copies should be addressed to the National Fire Protection Association, (Industry association specifications and standar
28、ds are generally available for reference from 2.3 Order of precedence. 470 Atlantic Avenue, Boston, MA 02210.) libraries. and the references cited herein, the text of this specification shall take precedence. They are also distributed among technical groups and using Federal agencies.) In the event
29、of a conflict between the text of this specification 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- I MIL-A-28772C( EC) 3. REQUIREMENTS 3.1 General. The antenna shall be in accordance with MIL-E-16400 to the extent specified herein. 3.2 First art
30、icle. When specified, a sample shall be subjected to first article inspection (see 4.3 and 6.3). 3.3 Antenna description and major components. The antenna shall provide unidirectional gain (see 6.4) se specified in 3.3.11.1 without tuning or adjust- ment. principles. The complete antenna shall be ea
31、sily erected using only standard hand tools and simple erect ion equip- ment within 8 days, using a maximum of six men working 8 hours per day. heavy erection equipment shall not be required. The antenna shall consist of the major assemblies specified in a through 1: The antenna shall be designed an
32、d fabricated in accordance with log periodic antenna The antenna shall be continuously rotatable in both directions over 363 degrees, The use of cranes or other a. b. d. e. f. 9. h. i. j. k. 1. C. Radiating elements and horizontal boom Supporting structure (tower) Rotator assembly Transmission line
33、Transformer, balanced to unbalanced (balun) Junction box Local control init Remote control unit Obstruction lighting kit Raising and lowering assembly Embedment hardware Instal 1 at ion kit The antenna shall be provided in kit form consistent with the requirements of 3.3.10 and 3.3.12. Parts require
34、d for the erection of a complote antenna shall be provided, excluding only the items specified in 1 through 3: in 3.3.4 building housing the remote control unit elements supported by a horizontal boom or booms. horizontal radiating elements of constant length and spacing ratios, arranged in a single
35、 planar array. The radiating elements shall be preassembled to minimize field assembly. All metallic portions of the radiating elements, horizontal boom, and feed straps shall be constructed of aluminum; however, aluminum clad steel may be used in wire strung arrays. shall be designed so that the ar
36、ray and boom can be easily raised and lowered as a complete unit. 110 feet (ft). support the radiating elements and boom during the raising and lowering process and under the specified operating conditions. mounted on a concrete base. The supporting structure shall be fabricated for erection in sect
37、ions, but each section shall be shipped disassembled (knocked-down). All required parts, cabling, grounding rods, and connectors necessary for grounding shall be furnished. 3.3.3 Rotator assembly. Upon receipt of a signal from the control unit, the rotator assembly shall rotate the radiating element
38、s and horizontal boom, hereinafter referred to as the antenna array. The antenna array shall be continuously rotatable through 360 degrees and in either direction, and shall be capable of being positioned within f5 degrees of any azimuth. Acceleration . and deceleration in response to the position c
39、ontrols shall be smooth, without chatter, and without detrimental oscillations. The rotator assembly shall be preassembled to allow nodular installation, and subassemblies and components within the assembly shall be of modular design to permit replace- ment without disassembly. The rotator assembly
40、shall rotate the antenna array to 1 revolution per minute 110 percent when a 60 hertz (Hz) power source is used. The rotator assembly shall be 1. 2. Concrete and reinforcing rods 3. Antenna control and power cable between the antennas junction box and the Coaxial cable to mate with the contractor-fu
41、rnished input connector specified 3.3.1 Radiating elements and horizontal boom. The antenna shall consist of radiating The configuration shall consist of a series of The array and boom The height of the boom above the top of the concrete mounting base shall not exceed 3.3.2 Supporting structure. The
42、 supporting structure or tower(s) shall be designed to To provide rigidity, the supporting structure shall be guyed and I c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-nIL-A-28772C 59 M 7797706 0033330 9 U designed to prevent rotation of the ante
43、nna array by the force of the wind on the antenna array or by any other force than that from the rotator assembly. used. disassembly of the rotator assembly. of delivering 50 percent more torque than that required to rotate the antenna array under the specified wind and wind plus ice condition The r
44、otator motor shall comply with CC-M-1807. Rotation shall be possible when the antenna array is subjected to the environmental conditions of 3.8 without the necessity for changing lubricants or performing special servicing in preparation for adverse weather conditions. Belt drives shall not be If a c
45、lutch is used, a means shall be provided for inspection of the clutch without The rotator motor and the drive mechanism shall be capable 3.3.3.1 Rotator relays. The antenna rotator control switches, both local and remote, shall control the rotator only via the operation of control relays. The contro
46、l relays shall be the time delay type, with circuitry designed to provide the following fail-safe feature: antenna rotator control switch is switched from one direction of rotation to the reverse direction, reversing power shall not be applied to the motor until all components placed in motion from
47、motor to antenna array elements shall have reached stationary equilibrium. such as relay contacts which control power to the motor, shall be self-wiping and arc-free when in the fully closed or open position, and shall be capable of carrying current at least 100 percent greater than the starting cur
48、rent of the motor under full load. control or power circuits. specified in 3.3.11 shall be provided from the base of the support structure to the radiating element array. A 3.625 inch (in.) EIA coaxial antenna input connector (flange) shall be provided at the foot of the tower. inclined at 90 degree
49、s with respect to the vertical (axis horizontal), and shall be no higher than 3 ft above the concrete mounting base. The flange shall be located in such a manner that neither the flange nor the incoming coaxial line will in any way interfere with the lowering operation. Preparation for lowering shall only require removal of the flange screws. All coaxial connections shall be made with IA flanges capable of handling the radio frequency (RF) powers specified in 3.3.11.2. If the All contacts, Slip rings sh
