1、 AMSC N/A FSC 5985 MIL-DTL-4946E 5 July 2013 SUPERSEDING MIL-DTL-4946D 8 January 2008 DETAIL SPECIFICATION ANTENNA ASSEMBLY AT-197( )/GR This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements
2、 for one type of discone antenna assembly, designed to operate at an impedance of 50 ohms, within the frequency range of 225 through 500 megahertz (MHz)(see 6.1). 1.2 Classification. 1.2.1 Type designation (see 6.2). The type designation of the antenna is derived from the Joint Electronic Type Desig
3、nation System specified in MIL-STD-196. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information o
4、r as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed 2.2.1 Specifications, standards, and handb
5、ooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-595/24084 - Green, Semigloss DEPARTMENT OF DE
6、FENSE SPECIFICATIONS MIL-DTL-17/79 - Cables, Radio Frequency, Flexible, Coaxial, 50 OHMS, M17/79-RG218 Unarmored, M17/79-RG219 Armored. MIL-DTL-3643 - Connectors, Coaxial, Radio Frequency, Series HN, and Associated Fittings, General Specification for. MIL-DTL-14072 - Finishes for Ground Based Electr
7、onic Equipment. Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to Tubesampsdla.mil. Since contact information can change, you may want to verify the currency of this address inform
8、ation using the ASSIST Online database at https:/assist.dla.mil. INCH-POUNDS Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-4946E 2 DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property. MIL-STD-810 -
9、 Environmental Engineering Considerations and Laboratory Tests. (Copies of these documents are available online at https:/www.assist.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, an
10、d publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AIR FORCE DRAWING 64C3418 - Antenna Assembly, A
11、T-197( )/GR, Discone. 64C3419 - Antenna Mounting. (Unless otherwise indicated, copies of the above specifications, standards, and handbooks are available from the procuring activity or as directed by the contracting officer.) 2.3 Order of precedence. Unless otherwise noted herein or in the contract,
12、 in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Preproduction. T
13、he antenna furnished under this specification shall be a product that has been tested, and passed the preproduction tests specified in 4.4. 3.2 General service requirements. General service requirements shall conform to best manufacturing practice. Exceptions and additions shall be as follows. 3.2.1
14、 Ambient temperature. The antenna shall be designed to operate over a temperature range of -54C (-65F) to +71C (+160F). 3.2.2 Relative humidity. The antenna shall be capable of operation up to a relative humidity of 95 percent between the temperature of 20C (68F) and 71C (160F) (see 4.6.4.5). 3.2.3
15、Service conditions (electrical). The electrical service condition requirements for the antenna shall be as specified herein (see 4.6.2). 3.2.4 Service life. The antenna shall be designed and constructed for continuous operation with a life expectancy of 5 years. 3.3 Material. The material for the an
16、tenna shall be of a type that will permit the antenna to meet the performance and environmental requirements of this specification. 3.3.1 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of radio and microwave frequency fixed
17、attenuator components and of solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum 3 percent lead, by mass (see 6.3). 3.4 Design and construction. The antenna shall have the design, construction, and physical dimensions specified in AF Drawing 64C3418. 3.4.1 Polarization.
18、The antenna shall be designed for vertical polarization. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-4946E 3 3.4.2 Antenna mounting. The antenna mounting shall be as specified in AF Drawing 64C3419 for mounting to antenna mast AB-158/GR.
19、3.4.3 Input connector. The input connector shall be of HN female series and shall have mating dimensions as specified in MIL-DTL-3643. 3.4.4 Cable. The cable from the input connector to the radiating elements shall be M17/79-RG218 (unarmored) in accordance with MIL-DTL-17/79. 3.4.5 Weight. The total
20、 weight of the antenna shall not exceed 15 pounds. 3.4.6 Finishing. Before painting, the antenna shall be given a protective finish in accordance with the requirements of MIL-DTL-14072. 3.4.7 Color. The color of the paint finish applied to the antenna, shall be number 24084 in accordance with FED-ST
21、D-595 (see 4.6.1). 3.5 Performance. 3.5.1 Gain. The gain from 225 through 400 MHz, shall not be less than 0.3 decibels (dB) over that obtained from a half-wave dipole, tuned to maximum efficiency (see 4.6.3.1). 3.5.2 Voltage standing wave ratio (VSWR). The VSWR over the entire frequency range shall
22、not exceed 2 to 1 with respect to 50 ohms (see 4.6.3.2). 3.5.3 Impedance. Normal impedance of the antenna shall be 50 ohms (see 4.6.3.3). 3.5.4 Radiation pattern. The horizontal radiation pattern shall be omni-directional and shall not vary from circular by more than 0.5 dB (see 4.6.3.4). 3.5.5 Freq
23、uency range. The antenna shall be capable of satisfactory operation without hiatus at any frequency throughout the 225 through 400 MHz range. Mechanical tuning to operate the antenna at any specified frequency in this range, after initial manufacturing or factory adjustments, shall not be required (
24、see 4.6.3.5). 3.5.6 Power capability. The antenna shall be capable of satisfactory operation with a radio-frequency (RF) carrier input of 1 kilowatt, amplitude modulated 100 percent by a 1,000 cycle per second signal (see 4.6.3.6). 3.5.7 Environmental. The antenna shall successfully pass all environ
25、mental tests listed in 4.6.4. 3.5.8 Marking. The antenna shall be marked in accordance with MIL-STD-130 with the type designation and manufacturers name, on a nameplate fastened to the antenna tube. 3.5.9 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environme
26、ntally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.5.10 Workmanship. Antennas shall be processed in such a manner as to be unifo
27、rm in quality and all surfaces shall be free of burrs, die marks, chatter marks, scratches, dirt, grease, scale, splinters, and other defects that will affect life, serviceability or appearance. 4. VERIFICATION 4.1 Test equipment and inspection facilities. Test equipment and inspection facilities sh
28、all be of sufficient accuracy, quality and quantity to permit performance of the required inspection. The supplier shall establish calibration of inspection equipment to the satisfaction of the Government. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
29、,-,-MIL-DTL-4946E 4 4.2 Classification of inspection. The examination and testing of the antennas shall be classified as follows: (a) Preproduction inspection (see 4.4). (b) Conformance inspection (see 4.5). (c) Inspection of product for delivery (see 4.5.1). 4.3 Inspection conditions. Except where
30、specified herein, all inspections shall be made at room ambient temperature, relative humidity, and pressure as specified in MIL-STD-810. 4.3.1 Order of tests. The tests shall be run in the order shown in table I. 4.4 Preproduction inspection. Preproduction inspection shall be performed by the suppl
31、ier after award of contract and prior to production, at a location designated by the Government (see 6.2). 4.4.1 Sample. Three antenna shall be submitted for preproduction inspection. 4.4.2 Test routine. Sample units shall be subjected to group of examinations and tests listed in table I for that in
32、dividual antenna. 4.4.3 Failures. Failure in any of the examinations or tests will be cause for refusal to grant approval of the antennas represented by the samples. TABLE I. Preproduction Inspection. Examination or test Requirement paragraph Method paragraph Antennas 1, 2 and 3 Visual and Mechanica
33、l Electrical Performance Antenna 1 Rain Salt fog Wind Ice Antenna 2 Fungus Sand and dust Low pressure Vibration Operating dynamic vibration Antenna 3 High temperature Low temperature Humidity Vibration Operating dynamic vibration 3.3, 3.4 to 3.4.7 incl. 3.5.8, and 3.5.10 3.2.3 3.5 to 3.5.6 incl. 3.5
34、.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 3.5.7 4.6.1 4.6.2 4.6.3 to 4.6.3.6 incl 4.6.4.9 4.6.4.8 4.6.4.10.1 4.6.4.10.2 4.6.4.1 4.6.4.2 4.6.4.6 4.6.4.7 4.6.4.11 4.6.4.3 4.6.4.4 4.6.4.5 4.6.4.7 4.6.4.11 Provided by IHSNot for ResaleNo reproduction or networking permit
35、ted without license from IHS-,-,-MIL-DTL-4946E 5 4.5 Conformance inspection. 4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A, B and C. 4.5.1.1 Inspection lot. An inspection lot, as far as practicable, shall consist of all the antennas produced u
36、nder essentially the same conditions and offered for delivery at one time. 4.5.1.2 Group A inspection. Group A inspection shall consist of the examinations and tests specified in Table II and each antenna offered on the contract or order shall be subjected to these tests. TABLE II. Group A Inspectio
37、n. Examination or test Requirement paragraph Method paragraph Visual and mechanical Electrical VSWR 3.3, 3.4 to 3.4.7 incl., 3.5.8, and 3.5.10 3.2.3 3.5.2 4.6.1 4.6.2 4.6.3.2 4.5.1.2.1 Disposition of items. Items which have passed the group A inspection shall be subjected to the Group B inspection.
38、Items which do not pass the group A inspection shall not be acceptable on the contract or order. 4.5.1.3 Group B inspection. Group B inspection shall consist of the tests specified in table III. TABLE III. Group B inspection. Examination or Test Requirement paragraph Method paragraph Performance 3.5
39、 to 3.5.5 Incl. 4.6.3 to 4.6.3.5 Incl. 4.5.1.3.1 Sampling plan. Statistical sampling and inspection shall be performed on an inspection lot basis with a random sample of units selected in accordance with table IV. The acceptance levels shall be based upon the zero defective sampling plan. No failure
40、s shall be permitted. TABLE IV. Group B Sampling Plan. Lot size Sample size 1-13 14-150 151-280 281-500 501-1200 1201-3200 3201-10,000 100 percent 13 20 29 34 42 50 4.5.1.4 Group C inspection. Group C inspection shall consist of the power test (see 4.6.3.6), vibration (see 4.6.4.7) and rain (see 4.6
41、.4.9) and shall be conducted on one antenna out of each lot of 200 or fraction thereof produced on the contract or order, except that the first samples selected shall be from the first units produced. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M
42、IL-DTL-4946E 6 4.6 Methods of examination and test. 4.6.1 Visual and mechanical examination. The antenna shall be examined to verify that the design, construction, physical dimensions, weight, finishing, color, input connector, marking, and workmanship are in accordance with the applicable requireme
43、nts (see 3.3, 3.4 to 3.4.7 inclusive, 3.5.8, and 3.5.10). 4.6.2 Electrical test. Each electrical component shall be given a continuity test to ascertain that it is wired and connected correctly and that good electrical contact is obtained (see 3.2.3). 4.6.3 Performance. 4.6.3.1 Gain. The gain of the
44、 antenna shall be computed by the comparison of a received signal strength from the test antenna to the received signal strength from a standard half-wave dipole antenna. Measurements shall be made with appropriate test equipment at 225, 310, and 400 MHz (see 3.5.1). 4.6.3.2 VSWR. The VSWR of the an
45、tenna shall be determined by the slotted line method, UHF bridge method, or a method approved by the contracting agency. Measurements shall be made at both extreme frequencies and at least three other evenly spaced frequencies within the operating frequency range. The values shall not exceed that sp
46、ecified (see 3.5.2). 4.6.3.3 Impedance. The impedance of the antenna shall be measured by one of the methods for measuring VSWR (see 3.5.3). 4.6.3.4 Radiation pattern. The radiation pattern shall be determined by the use of a “field-strength” or pattern measuring system, or other method acceptable t
47、o the procuring agency (see 3.5.4). 4.6.3.5 Frequency range. The frequency range requirements shall have been met if the antenna meets the requirements for gain, VSWR and power capability at the frequencies specified (see 3.5.5). 4.6.3.6 Power capability. Maximum power shall be applied to the antenn
48、a for a period of 2 minutes from a transmitter designed to operate with such an antenna, without malfunction of, or damage to, the antenna (see 3.5.6). The continuity and VSWR shall then be checked in accordance with 4.6.2 and 4.6.3.2. 4.6.4 Environmental tests. The antenna shall be subjected to the
49、 following environmental conditions in accordance with MIL-STD-810, with the following exceptions, without deterioration of quality or performance (see 3.5.7). After each environmental test, the continuity and VSWR shall be checked in accordance with 4.6.2 and 4.6.3.2. 4.6.4.1 Fungus. The antenna shall be subjected to the fungus test in accordance with method 508, procedure I. A certified statement by the contractor that all materials
