1、MIL-A-237bbB 59 99999Ob 0028213 B E MIL-A-237666( EC ) 16 February 1987 mmmr MIL-A-23766A( SHIPS) 29 November 1968 MILITARY SPECIFICATION ANTENNA , AS-10 18A/URC This specification is approved for use by the Space and Naval Warfare Systems Conand, Department 1. SCOPE 1.1 SCO e. of the Navy, and is a
2、vailable for use by all Departments and Agencies of the Department of Defense. This specification covers the design,. performance, and test requirements for the Antenna, A-f S- 018A/URC, hereinafter referred to as the antenna. The antenna provides broadband frequency coverage in the 225 megahertz (M
3、Hz) to 400 MHz range for ultra high frequency, and high gain to be used for shipboard and shore installations. 2. APPLICABLE DOCUMNTS 2.1 Ciojernment documents. 2.1.1 Specifications, standards, and handbooks, The following specifications, standards, and handbooks form a part of this specification to
4、 the extent specified herein. specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the sol i ci tat i on, Unless otherwise SPECIFICATIONS MILITARY MIloC-17/79 MI b -S -
5、 901 MIL-Y-1140 MIL-E-2036 MIL-C-5541 MIL-C-9084 MIL-R-9300 MIL-P-15024 MIL-P-15024/5 MIL-E-16400 MIL-E-17555 MIL-P-24441 MIL-Y-83370 STANDARDS MI L I TARY MIL-STD- 105 MIL-STD-108 MIL-STD-109 MIL-STD-167-1 AMSC N/A Cables, Radio Frequency, Flexible, Coaxial , 50 OHMS Unarmored M17/79-RG-218 And Arm
6、ored M17/79-RG-219 Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment And Systems, Requirements For Yarn, Cord, Skewing, Cloth And Tape-Glass Enclosures For Electric And Electronic Equipment, Naval Shipboard Chemical Conversion Coati ngs On Al umi num And Al umi num Al 1 oys Cloths, Gla
7、ss, Finished, For Resin Laminates Resin, Epoxy, Low-Pressure Laminating Plates, Tags And Bands For Identification Of Equipment Plates, Identification Electronic , Interior Communication And Navi gation Equipment, Naval Ship And Shore: General Specification For Electronic And Electrical Equipment, Ac
8、cessories, And Provisioned Items (Repair Parts) : Packaging Of Paint, Epoxy-polyamide , General Specification For Yarn, Roving, And Cloth: High Modules, Organic Fiber Sampling Procedures And Tables For Inspection By Attributes Dfinitions Of And Basic Requirements For Enclosures For Rleetric And Elec
9、tronic Equipment . QuplIty Assurance Terms and Definitions Mechanical Vi brations Of Shipboard Equipment (Type I - Environmental And Type II - Internally Excited) FSC 5985 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this documen
10、t should be addressed to: Commander, Space and Naval Warfare Systems Comnand (SPAWAR-003-1211, Washington, DC 20363-5100, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter. . DISTRIBUTION STATEMENT C. Distribu
11、tion limited to U.S. Government agencies and their contractors; (opermomawstrative use) (November 5, 1986). Other requests for this document shall be referred to Commander, Space and Naval Warfare Systems Command (SPAWAR-Rw52-12) , Washington, DC 4 1.l PAGES. I 20363-5100. THIS DOCUMENT CONTAINS i P
12、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL- STD-454 MIL-STD-810C MIL-STD-1310 3.2 Parts, materials and processes* Parts, materials, and processes shall be in accordance with 3,2,1 Parts, Selection of parts shall be in accordance with the Sele
13、ction paragraph of . the Parts, materials, ai The antenna shall be designed to withstand snow and ice loading on horizonBa1 (i bs/ft 1). discrepancies as would nqrmally be expected through snow and ice. 3.5.7 Ici9 when coveredith an ice lqad22.0 kgh2 (4,5 lbs/ft2). 3.5.8 Pressurization, The aptennit
14、 shall be nomally operated unpressurized, but shall be capable .of being pressurized to 15 pounds per square inch gage. At the time of delivery, the antenna shall be purged of air and filled with dry nitrogen to 5 lbs per square in. absolute. A pressure relief valve (prv) shall be provided in case o
15、f OverGresgire. 0967-LP-971-2010 for the close nipple. 2 . 47 E %C in accordance with Range 2 of MIL-E-16400, for unsheltered equipment. 3.5.3 Hymidity. The antenna shall have full operational capability when subjected to a relative 3.5.4 Salt _rga_$bxT fa (s r 1, The antenna shall have full operati
16、onal capability after being subjected 3.5.5 Wind velqcity. c -_ 1_ ,- MIL-A-237bbB 59 9999906 0028223 O W MIL-A-23766B( EC) a 1000 u00 600 400 200 c 1 O0 NI U U W 5 20 10 8 6 4 2 1 FIURE 1. Test shock spectra. 11 J Provided by IHSNot for ResaleNo reproduction or networking permitted without license
17、from IHS-,-,-MXL-A-237666( EC) 4,6,5.7 Vibration test. The vibration test shall be in accordance with the Vibration test paragraph of ilIlXXTE 4.6.5.8 Humidi test, Conformance to the humidity requirements of 3.5.3 shall be- verified in 4,6.5,9 Fungus test, The fungus test shall be performed in accor
18、dance with MIL-STD-810G, 4.6.5.10 Envlronmental anal sis. Conformance to the requirements of 3.5.5 through 3.5.7 shall be accordance widty test paragraph of MIL-E-16400, Method 508,2. verified by analysis to detem -+-fi ne t at the antenna is capable of sustaining the specified forces while conformi
19、ng to all performance characteristics requirements, 4,6.5,11 Salt fo test, Tests shall be conducted in accordance with the Salt fog test paragraph of MIL-E-16400, Or expose equipment, using Procedure II. This test shall verify compliance with the painting processes of 3,2,2.1, The criteria of the Ad
20、hesion and blister resistance paragraph of MIL-E46400 shall be used for evaluation of the painting processes, . l act, 4.6.5,12 Nuclear air blast calculations. The nuclear air blast calculations of MIL-E-16400 and arameter values of 3,5.14 shall be used to verify conformance to the requirements for
21、nuclear air 4.6.5.13 Adhesion and blister resistance, The paint system test method shall conform to the Paint system test paragraph of MIL-t-16mTU Procedure II. 4,6,5.14 Random vibration, The vibration shall be performed at the end item level. All the hardware, fnclaing cables and connectors, shall
22、be exposed to vibration. The vibration shall be random or subject to procuring activity approval, pseudo-random or complex waveform vibration, for an accumulated time of 10 minutes in the axis deemed most susceptible to vibration excitation. All items shall be hard-mounted (without shock isolators)
23、and subjected to the vibration condiions of FIGURE 2. The input vibratlon levels shall be measured at the mounting points of the items under vibration, If variations are found at these points, the level used for control purposes shall be the average of the level at the mounting points. Control equip
24、ment having a bandwidth no greater than 10 Ht for vibration frequencles up to 500 Hz shall be used for the control and analyses of acceleration spectral density - (ASDI, The instantaneous acceleration peaks may be 1 imited to three times the root-mean-square acceleration level During vibration, VSWR
25、 shall be monitored so that abnormal or intermittent conditions may be found, Failures occurring during vibration chai1 be corrected and the vibration resumed for an accumulated time of 10 minutes. ASD 0.04 . 360 2000 FREQUENCY IHz) FIGURE 2, Random vibration curve, 4.7 InspectJon of packaging. Insp
26、ection shall be performed to ensure conformance with the requirements of Section 5. 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-mIL-A-237bbB 59 9999906 0028225 4 MIL-A-237666( EC) 5. PACKAGING (The preparation for delivery requirements specifi
27、ed herein apply only for direct Government procurements. Preparation for delivery requirements of referenced documents 1 isted in Section 2 do not apply unless specifically stated in contract. Preparation for delivery requirements for products procured by contractors chal 1 be specified in the indiv
28、idual order. 1 5.1 Preservation, packaging, packing, and marking. Unless otherwise specified herein, preparation for delivery shall be in accordance with the applicable levels of preservation, packaging, packing, and marking specified in MIL-E-17555 (see 6.2). 6. NOTES c *i i s + I- 6.1 . Intended u
29、se. The antenna covered by this specification is intended for use on board ship and at shore base installations to provide vertically polarized horizontal omnidirectional coverage over a frequency range from 225 MHz to 400 MHz. 6.2 Ordering data, Procurement documents should specify: a. Title, numbe
30、r, and date of this specification b. GFM, if any (see 3,1,2) c. Interchangeability requirements if other than specified (see 3.2.1.2) d Number of first article samples to be submitted if other than specified in 4.4 8. If sampling for Group 6 inspection is other than specified in 4.5.3 f. If sampling
31、 and equipment for Group C inspection is other than specified in 4.5.4 9. When reinspected conforming production control and environmental inspection samples may h, Levels of preservation, packaging, packing, and marking (see 5.1) not be accepted see 4.5.6) 6,3 First article. When a first article in
32、spection is required, the item should be a first article sample. The first article should consist of one unit. The contracting officer should include specifics instructions in acquisition documents regarding arrangements for examinations, approval of first article test results, and disposition of fi
33、rst articles. Invitations for bids should provide that the Government reserves the right to waive the requirement for samples for first article inspection to those bidders offering a product which has been previously acquired or tested by the Government, and that bidders affering such products, who
34、wish to rely on such production or test, must furnish evidence with the bid that prior Government approval is presently appropriate for the pending contract. 6.4 Definitions, Definitions of terms used in this specification are given in 6.4.1 through 6.4.3. 6.4.1 Shock, Grade A. Shock, Grade A, items
35、 are defined as: machinery, equipment, and systems essential foxg-safety and continued combat capability of the ship. Shock testing is to demonstrate that the item will continue to perfonn its principal function without significant change in performance and that no pwtion of the equipment will come
36、adrift or otherwise become a hazard to personnel or to Grade A machinQr$, equipment, or systems during and following the application of shock loadings. 6.4.2 k Mmax is the maximum time to repair at the 95th percentile. That is, 95 percent of all maintenance tasks should be accomplished within this t
37、ime (see 3.10.3). 6.4.3 MTTR. MTTR is the summation of active repair time during a given period of time divided by the total nfir of malfunctions during the same interval. Active repair time includes the following task time increments : preparation, 1 oca1 ization, is01 ation, disassembly , intercha
38、nge, reassembly, alignment, and verification checkout (see 3.10.2). 6.5 Production control and environmental inspection. Approval to ship may be withheld at the discretionmbovernment, pebding theXecision from the ontracting officer on the adequacy of corrective action (see 4.5.5). I 6.6 Personnel sk
39、ills. In designing equipment for ease of maintenance, information concerning Naval personnel skills and skill levels is available in NAVPERS 18068 and NAVPERS 15105. Electronics Technician or Radiomen ratings to be considered in performing maintenance tasks are Petty Officer Third Class (E-4) and Se
40、aman Striker (E-3) (Class A school graduate). 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-237668 (EC) 6,7 Sayard installation, The building shipyard will provide structural foundations suitable for the antenna and conforming to NAVSHIPS
41、0961-LP-971-201Q. 6.8 GFM, GFI, and GFE, The contracting officer should arrange to furnish the equipment specified in 3.1.2, 6.9 Subject tem(Sey word) listing, Antenna AS-l018A/URC AS-l018A/URC, Antenna Distribution statement C Intended use: Shipboard and chore-based 6.10 Chan es from revious issue.
42、 Asterisks are not used in this revision to identify changes with respec +-7-3 o tK prev ous ssue ue ?o the extensiveness of the changes. Preparing activity : MAVY - EC (Project No. 5985-N550) L if - k- t n 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
