1、MILITARY SPECIFICATION ANTENNA, WHIP, 10.67 METER (35 FEET), AS-2537( )/SR This amendment forms a part of Military Specification MIL-A-243398 dated 6 Apri is approved for use by the Space and Naval Warfare Systems Command Department of the is available for use by all Departments and Agencies of the
2、Department of Defense. “Antenna, Whip, 10.67 Meter (35 Feet), AS-2537( Title: Delete and substitute: PAGE 1 1981, and Navy, and /SR“ . * 2.1 SPECIFICATIONS “FEDERAL“: Delete “QQ-N-35“ and add: “FF-B-575 Bolts, Hexagon And Square “QQ-8-626 Brass, Leaded And Nonleaded: Rod, Shapes, Forgings, And F Pro
3、ducts With Finished Edges (Bar And Strip) “QQ-8-750 Bronze, Phosphor; Bar, Plate, Rod, Sheet, Strip, Flat Wire And Structural And Special Shaped Sections“ * 2.1 “SPECIFICATIONS“ “FEDERAL“: After “QQ-C-533“, delete: “QQ-8-626 Yellow Brass“ * 2.1 “SPECIFICATIONS“ “MILITARY“: After “MIL-S-901(NAVY), ad
4、d: “MIL-S-1222 Studs, Bolts, Hex Cap Screws, And Nuts“ * 2.1 “SPECIFICATIONS “MILITARY“: After “MIL-E-17555, add: “MIL-F-18240 Fastener, Externally Threaded, 250OF, Self-Locking Element For“ PAGE 2 3.3.1.1.1, line 2: Delete “A“ distribution is un1 imited. Provided by IHSNot for ResaleNo reproduction
5、 or networking permitted without license from IHS-,-,-PAGE 3 3.3.2.2: Delete text and substitute: “The antenna shall have a maxiniuni envelope diameter of 13.5 in. and a maximum height of 36 fLu. 3.3.3: Add “The antenna shall be capable of conforming to the specific failure cribria of 4.5.18. “. PAG
6、E 4 3.3.3.6.2, line 5: Delete 4.15.6.2 and substitute 4.5.16.2“. 3.3.3.10, line 4: Delete “three resonant frequencies“ and substitute four resonant frequencies (natural modes)“. * 3.4.1.1, add as first sentence: Fastener hardware shall be in accordance with MIL-S-1222.“ PAGE 7 3.5.2.2, line 1: Delet
7、e “an even niaber of and substitute six“. PAGE a 3.6.1.1.2, line 3: Delete 4.13“ and substitute 3.90“. 3.6.1.1.2, line 4: Delete 6.30 and substitute 5.50. 3.6.1.2.2, line 3: Delete “4.13 and substitute “3.90“. 3.6.2.2, line 1: Insert internal“ bekeen an“ and O-ring“. 3.6.2.2: Delete third sentence a
8、dded by Amendment 1. i 3.6.3.1 , line 2: Delete “natural vibration modes“ and substitute natural vibration nodes above siode 1. Delete paragraph number 3.5.3.2“ and substitute “3.6.32. PAGE 9 3.7.1bD line 2: Delete application tube of room temperature vulcanizing (RTV) silicone rubber sufficient to
9、backfill the three lacking pin holes and the 450 chamfer groove, inserted by Amendment 1, and substitute small application tube of room temperature vulcanizing (RTV) silicone rubber“. 3.7.2aD line 1: Delete “on“ and substitute “or“. 3.9, after first sentence: Add Each matched upper and lower section
10、 of an antenna shall be clearly marked with that antennas serial nuaber.“. PAGE 12 4.5.6, line 3: Delete “a maximm of 18 in of and substitute an 18-inch“. PAGE 13 4.5.15: Delete first sentence and substitute: “The antenna shall- be vertically mounted on 4.5.16, line 2: Delete “4.16.1 and 4.16.2 and
11、substitute “4.5.16.1 and 4.5.16.2“. a truck bed using a specially fabricated antenna mount. 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-PAGE 15 4.5.18, add: “An additional cause for failure shall be leakage resistance from the antenna feed poin
12、t to a metal base mounting plate of less than 1000 megohms at completion of the salt fog test and prior to any rinsing, cleaning or drying. All measurements shall be made with a Biddle Megger, or equivalent megohmeter with 600 volt potential minimum. The metal base mounting plate for the 24-inch sec
13、tion shall be 1/2 inch thick, 6061-T6 aluminum alloy, 24-inches square and drilled to match the mounting hole pattern of the antenna mounting base. This plate shall have a 6-inch diameter hole drilled in the center of the antenna base hole pattern to allow the ingress of salt fog during this test. T
14、he plate shall have a Class 1A chemical conversion coating in accordance with MIL-C-5541 after all holes are drilled. The antenna section which was used in test 4.5.17.1a shall be bolted to this mounting plate in accordance with FIGURE 1. 4.5.24, line 2: Delete “Procedure II“ and substitute “Procedu
15、re I“. The margins of this amendment are marked with an asterisk to indicate where changes (additions, modifications, corrections, deletions) from the previous amendment were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these no
16、tations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. Preparing activity: (Project No. 5985-N529(EC) NAVY - EC Provided by IHSNot for ResaleNo re
17、production or networking permitted without license from IHS-,-,-AMENDMENTS w c5 % L4 W m 2 2 c z 2 Lrl b z U X VI lnb I -z O 34 r. O 2 P I L4 4 hW - .rl LI o o n IN IO Wa: or4 mz I Y %I m Supersedes page 5 of MIL-A-243196 EC , 6 April 1981 Il - Provided by IHSNot for ResaleNo reproduction or network
18、ing permitted without license from IHS-,-,- -CI_ MIL-A:2339B (5) 59 9999906 0030037 2 i.- .a MIL-A-24319B( EC 1 AMENDMENT 5 34.2.1.1 Reinforcing materials. The reinforcing material for the insulator shall be Type E (electrical grade) alumina borosilicate glass with a silane finish sizing). Reinforci
19、ng material shall be continuous glass roving gathered without mechanical twist. Yarn, fabric, or other woven material shall not be utilized. 3.4.2.1.1.1 Glass rovin The glass roving shall not contain grease, oil, or dirt inside its form. The glass _Qh roving s all not contain knots, loose strands, o
20、r fuzz accumulation which will cause a detectable change in the smoothness of the glass roving. 3.4.2.1.2 Epoxy resin system. The antenna shall employ an epoxy resin system in accordance with MIL-R-9303. 3.4.2.2 Gradin rin s. The grading rings shall be of fiberglass reinforced plastic (FRP) composit
21、e mat- 3.4.2.3 Antenna mounting base. 3.4.2.4 Antenna current carrying material, 3.4.2.4.1 Longitudinal current carrying strips. The antenna current carrying material The antenna mounting base shall be of FRP composite material made of the same glass and resin system as the antenna structure proper,
22、 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 of the antenna to terminate the top section longitudinal current carrying strips shall be of brass per QQ-B-626, composition 22, 1/
23、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-B-626, composition 22, 1/2 hard. 3.4.2.4.4 Lower section, collector ring. The lower section collector ring te minating the lower section longitudinal conductors shall be
24、of brass per QQ-8-626, composition 22, 1/2 hard, 3.4.2.5 Static seals. The midsection coupling joint shall employ a deformab static seal in accordance with MIL-E-16400 to preclude entry of moisture and salt e O-ring spray. 3.4.3 Processes, 3.4.3.1 Castings, All castings used shall be in accordance w
25、ith MIL-E-16400. 3.4.3.2 Corrosion protection and corrosion resisting treatments. All metal structures and assemblies used in the antenna Shall be protected from corrosion by a chemical conversion treatment per MIL-C-5541 , Type I II. blister resis t-9 ance requirements of MIL-E-16400. accordance wi
26、th MIL-E-16400 with a cyclo-aliphatic epoxy paint which includes an ultra-violet screen and exhibits anti-electrical erosion and self-extinguishing properties. interface (primer) coatings between the MIL-C-5541 metal surface treatment and the cyclo-aliphatic top coating on all surfaces exposed to th
27、e environment and where electrical contact is not required for proper electrical operation. * 3.4.3.3.3 Antenna interior. The entire interior of the lower section shall be postcoated with Dow-Corning 1-257/ C onfonnal Coating, or equal , silicone elastoplastic resin. 3.4.3.3 Paintin . 3.4.3.3.1 Ante
28、nna exterior. The external structure of the antenna shall be painted in The paint system used for the antenna shall meet the adhesion and 3.4.3.3.2 Antenna metal components. The antenna metal components shall have the necessary 3.4.3.4 Brazing. Brazing shall be in accordance with the brazing requirements of MIL-E-16400. 6 Supersedes page 6 of MIL-A-24319B(EC), 6 April 1981 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
