1、? O O O MIL-A-243L9B 57 7799906 0030038 4 W MI L-A-24319B ( EC) 6 April 1981 SUPERSEDES- MIL-A-24319A( EC) 10 December 1969 MILITARY SPEC IF ICATION ANTENNA WHIP, AS-2537( )/SR 10.67 METER (35 FT) 1. SCOPE 1.1 This specification covers the design, performance and testing of a two-piece 35 foot(ft) f
2、iberglass reinforced plastic composite whip-type antenna (hereinafter called the antenna) for use aboard surface ship and shore facilities for general cornunications purposes. This antenna is designed for transmit and receive operations aver, the 2.0000 through 29.9999 megahertz(MHz) frequency range
3、 and“receive only operation oder the -10-ki lohertz(kHz) to 2.0000 MHz frequency range. 2. APPLICABLE DOCUMENTS 2.1 Government documents. The following documents, of the issue listed in the Department of Defense Index of Specifications and Standards (DoDISS) and its supplements, form a part of this
4、document to the extent specified herein. The date of the applicable DoDISS and supplements thereto shall be as specified in the solicitation. SPECIFICATIONS FEDERAL QQ-N-35 99-c-533 QQ-B-626 MILITARY MIL-S-901( NAVY) MIL-C-5541 . MIL-S-8660 MIL-R-9300 MIL-E-16400 MIL-E-17555 STANDARDS MILITARY MIL-S
5、TD-105 MIL-STD-109 MIL-STD-167-1 Naval Brass; Rods, Bars, Wire, Shapes, And Forgings And Flat Products With Finished Edges Copper-Beryllium Alloy Strip (Copper Alloy . Numbers 170 and-172.) Ye1 low Brass Shock Test, HI (High Impact); Shipboard Machinery, Equipment and Systems, Requirements for (Navy
6、) Chemical Conversion Coatings on Aluminum and Aluminum Alloys Si 1 i cone Compound Resin, Epoxy Electronic Equipment, Naval Ship and Shore, General Specification for Electronic and Electrical Equipment , Accessories, and Repair Parts, Packaging and Packing of Sampling Procedures and Table for Inspe
7、ction by Attributes Quality Assurance Terms and Definitions Mechanical Vibrations of Shipboard Equipment ,- .FSC 5985 I. -, I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-24319B( EC) (Copies of specifications, standards, handbooks, publicati
8、ons and drawings required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer). the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request f
9、or proposal shall apply. 2,2 Other publications. The following documents form a part of this specification to AMERICAN NATIONAL STANDARDS INSTITUTE ANSI C29.1 E lec tr ica 1 Power Insu 1 ators , Test Methods for 3 REQUIREMENTS 3.1 $eneral. Equipments shall be in accordance with the provisions of MIL
10、-E-16400, to the extent specified herein. 3.2 First article(s2. When specified in the contract, five preproduction samples of the antenna shall be supplied for first article evaluation in accordance with 4.3 prior to conmencement of production. These samples chal 1 be completely representative of pr
11、oduction equipment s. 3.3 Characteristics. 3.3.1 Performance characteristics 3.3.1.1 Operating frequency rancie. 3.3.1.1.1 Matched condition. The antenna shall be capable of operating as specified herein over the inclusive frequency range of 2.00QO to 29.9999 MHz and with the AN/URA-( ) selective an
12、tenna coupler group and the generic AN/URA-38 antenna coupler group to provide a matched, efficient transmit and receive antenna system. frequency range of 10 kHz to 29.9999 MH2 with a SD-ohm termination to provide a receive system sensitivity (operating noise factor) nominally limited by external n
13、oise. 3.3.1.2 Feed point impedance. The antenna shall have a feed point impedance within the limits stated in TABLE I, when measured through a 18-inch(in) low inductance feed strap, when configured vertically at the center of a 5QO-ft minimum radius ground plane with vertically polarized, conducting
14、 structures subtending an angle greater than 10 degrees from the antenna mounting point through 1000 ft and when measurements are made in accordance with 4.5.6. 3.3.1.3 One quarter wave length frequency The antenna shall go through its first series resonance (one quarter wave frequency), as determin
15、ed by the first Rtjo axis crossing, at 6.75 MHz 9.25 MHz and when measured in accordance with 4.5.7. kilowatt(kW) average power and 10 kW peak envelope power(PEP) indefinitely without damage or degradation in performance when measured in accordance with 4.5.8. 3.3.1.1.2 Terminated condition. The ant
16、enna shall be capable of operating over the inclusive 3.3.1,4 Radio frequencu(RF) power rating. The antenna shall be capable of handling 5 2 O O a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-243L78 57 m 7777706 0030040 2 W MIL-A-24319B( EC)
17、 a, I Frequency (MHz) I Resistance (OHMS) b I TABLE I.A. Nominal impedance vs. frequency (2.0 to 5.0 MHz) with allowable tolerances. O 2.0 3.0 4.0 5.0 2.50 4.00 8.00 16.00 R tolerance +o. 75 -0.25 - +0.50 - +0.50 - +O. 50 Reactance (OHMS) -j500 -j300 -jim -jlOO TABLE I.B. Nominal impedance (6 to 30
18、MHz). Frequency (MHz) 6 7 8 9 10 12 14 16 18 20 22 24 26 28 30 X tolerance +j100 -330 - +j20 - +j20 - +j20 - VSWR (50 ohm system) 3:l or less 3: 1 6: 1 9: 1 12:l 18:l 20: 1 14: 1 5:l 4:l 8: 1 9: 1 1O:l 1O:l 6: 1 3.3.2 Physical characteristics . 3,3.2.1 Weiqht. The antenna shall have a nominal maximu
19、m weight of 176.37 pounds(lbs), exclusive of packing, crating and maintenance and installation kits. 3.3.2.2 Size. The antenna shall have a maximum envelope diameter of 12 in a maximum height of 36 fc 3.3.3 Environmental service conditions. . 3.3.3.1 Operating temperature range. The antenna shall ha
20、ve an operating temperature 3.3.3.2 Non-operatinn temperature ranqe. The antenna shall have a non-operating temperatre 3.3.3.3 Salt foq (spray). The antenna shall meet the salt fog (spray) requirements of range of that for equipments exposed to weather (unsheltered) of MIL-E-16400 (Range 1). range o
21、f that of equipments exposed to weather (unsheltered) of MIL-E-16400 (Range 1). MIL-E-16400 for exposed equipment. % . . 3.3.3.4 Sunshine. The antenna shall meet the sunshine requirements of MIL-E-16400. 3.3.3.5 Funqus. The antenna shall meet the fungus requirements of MIL-E-16400. 3 Provided by IHS
22、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-243198( EC) 3.3,3.6 Repeated wind loads, 51- a 3.3.3.6.1 Spectrum I loadings. The antenna when installed in a $qytiba.i position shall withstand 500,000 cycles, in a simulated sea.spray environment, of a drag lo
23、ading due to a 25 knot wind increased to that for 75 knot wind and return (loading specerum I). The antenna shall not experience structural or electrical degradation which would require replacement in service (see 4.5.16 and 4.5.16.1). Drag coefficients to be employed in calculating wind loads shall
24、 be subject to approval by the procuring activity. 3.3.3.6.2 Spectrum II loading. Separately, tbe antenna when installed in a vertical position shall Withstand 1000 cycles of loading from a drag loading corresponding to a 65-knot wind to that for a 125-knot wind and return (loading spectrum II). The
25、 antenna shall not ex- perience structural or electrical degradation which would require immediate replacement in service. loads shall be subject to approval by the procuring activity. - ., . . (See 4.5.16 and 4.15.16.2). Drag coefficients to be employed in calculating wind 3.3.3.6.3 Structural exam
26、ination-spectrums I and II loadinq. The antenna shall be capable of passing the structural examination of 4.5.16.3following spectrum I and II loading. 3.3.3.6.4 Structural examjnation. The antenna shall be capable of passing the structural examination of 4.5.16.4 at any point fn the time sequencing
27、of section four testing. that a sample submitted for purposes of determining compliance with 3.3.3.6.4 will be totally consumed in the examination process,) vibrations at all wind velocities up to and including 125 knots and when tested in accordance with 4.5.15. 3.3.3.8 Nuclear air blast. The anten
28、na shall conform to the nuclear air blast requirements of MIL-E-16400. The peak overpressure, P, shall be 7.2 lbs per square in.(psi) and the peak dynamic pressure, Q, shall be 1.2 psi, 3.3.3.9 Shock. The completely assembled antenna shall be capable of withstanding, in both horizontal and vertical
29、orientation, the Grade I, Type A, class HI (High Impact) shock test for light weight equipment of MIL-S-901 when tested in accordance with 4.5.22. and vertical orientation, the type 1 environmental vibration requirements of MIL-STD-167-1. The antenna ;hall be capable of withstanding 9 x .lo double a
30、mplitude cycles or 250 hours, whichever is greater, of resonant dwell vibration at each of the first three resonant frequencies, with maximum exciting table amplitude applied orthogonally to antenna longitudinal axis. Internal conductor continuity for all conductors in both upper and lower sections
31、and from section to . section shall be maintained for this time duration. (Note 3.3.3.7 Wind induced vibratjons. The antenna shall be free of sustained, self-induced 3.3.3.10 Vibration. The completely assembled antenna shall withstand, in both horizontal 6 3.4 Parts, materials and processes, 3.4.1 P
32、arts. 3.4.1.1 Fastener hardware, 3.4.1.1.1 Antenna feed point attachment hardware. Antenna feed point attachment hardware shall be in accordance with FIGURE 1. 3.4.1.1,2 Antenna deck and table base mounting. Antenna deck and table base mounting hardware shall be in accordance with FIGURE 1. 3.4.1.1.
33、3 Upper-to-lower-section locking hardware. Upper-to-lower-section locking hardware shall be in accordance with FIGURE 1. 3.4.2 Mater i als. 3.4 . 2.1 Antenna structural materi als. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. MIL-A-24317B 57
34、7779706 0030042 b ._ - 5 MIL-A-24319B ( EC) c I 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-243198( EC) 3,4.2,1.1 Reinforcing materials, The reinforcing material for the insulator shall be type E (electrical grade) alumina borosilicate gl
35、ass .with a silane finish (sizing), Reinforcing material shall be continuous glass roving gathered without mechanical twist. Yarn, fabric, or other woven material shall not be utilized, its form. The glass roving shall not contain knots, loose strands, or fuzz accumulation which will cause a detecta
36、ble change in the smoothness of the glass roving. 3,4.2.1.1.1 Glass roving. The glass roving shall not contain grease, oil, or dirt inside 3.4.2.1.2 Epoxy resin system, The antenna shall employ an epoxy resin system in accordance With MIL-R-9300. 3.4.2.2 Grading rings. The grading rings shall be of
37、fiberglass reinforced plastic (FRP) composite material o 3,4.2.3 Antenna mounting base. The antenna mounting base shall be of FRP composite material 3.4.2.4 Antenna current carrying material. made of the same glass and resin system as the antenna structure proper. 3.4.2.4,l Longitudinal current carr
38、ying strips. The antenna current carrying material shall be beryllium copper alloy strip, copper alloy number 172, half hard (1/2 hard) per QQ-C-533. 3.4.2.4.2 Corona shield. The corona shield used in the upper section bf the antenna to terminate the top section longitudinal current carrying strips
39、shall be of brass per QQ-8-626, composition 22, 1/2 hard. 3.4.2,4.3 Midsection coupling joint. The upper and lower halves of the midsection coupling Joint shall be of brass per QQ-8-626, compocition 22, 1/2 hard. 3.4.2.4.4 Lower section collector ring. The lower section collector ring terminating th
40、e lower section longitudinal conductors shall be of brass per QQ-8-626, composition 22, 1/2 hard static seal in accordance with MIL-E-16400 to preclude entry of moisture and salt spray, 3.4,2.5 Static seals. The midsection coupling joint shall employ a deformable O-ring 3.4,3 Processes. 3,4.3.1 Cast
41、ings. All castings used shall be in accordance with MIL-E-16490. 3.4,3,2 Corrosion protection and corrosion resisting treatments, Al 1 metal styuctures and assemblies used in the antenna shall be protected from corrosion by a chemical conversion treatment per MIL-C-5541, type I I I. bl ister res i s
42、tance requirements of MIL-E-16400. 3,4.3,3 Painting. The paint system used for the antenna shall meet the adhesion and 3,4.3.3.1 Antenna exterior. The external structure of the-antenna shall be painted in accordance with MIL-E-16400 with a cyclo-aliphatic epoxy paint which includes an ultra-violet s
43、creen and exhibits anti-electrical erosion and .self-extinguishing properties. 3.4.3.3,2 Antenna metal components. The antenna metal components shall have the necessary interface (prin:er) coatings between the MIL-C-5541 metal surface treatment and the cyclo-aliphatic top coating on all surfaces exp
44、osed to the environment and where electrical contact is not required for proper electrical operation. 8 3.4.3,4 Brazing. Brazing shall be in accordance with the brazing requirements of MIL-E-16400. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.,
45、 O O O MIL-A-ZY3178 - 57 m 779770b 003004Y T MIL-A-24319B( EC) 3.5 Electrical design and construction. 3.5.1 Physical lenqth of conductors. The total length of longitudinal current carrying conductors in the fully assembled antenna, measured from the base of the feed point collector ring assembly of
46、 the lower section through the top of the corona shield of the upper section shall be 35 ft. 3.5.2 Geometry of conductors. 3.5.2.1 Bottom section. The bottom section of the antenna shall employ six equally spaced longitudinal conductors brazed to the cylindrical f.eed point collector ring at the dec
47、k mounting end and brazed to the bottom of the lower half of the coupling section brass ferrule, 3.5.2.2 Top section. The top section of the antenna shall employ an even number of equally spaced longitudinal conductors brazed to the upper half of the coupling section brass ferrule and brazed to the
48、brass corona shield at the end of the top section. 3.5.2.3 Conductor cross section. The conductors employed in the antenna shall be of sufficient cross section and detailed interconnection geometry to accomnodate 5 kW of average RF power and 10 kW PEP under conditions of failure of up to and includi
49、ng 20 percent of the total midsection longitudinal conductor crass section with no degradation of the structural integrity due to thermal stress or high voltage breakdown phenomena such as corona or arcing. 3.5.2.4 Location of feed point. The antenna feed point center shall be nominally 12 in from the datum (mounting plane of antenna) and shall be attached to the center of the collector ring assembly. 3.5.3 Integral base insulator. The antenna shall cont
