1、 MIL-PRF-4920YB 9999906 2042838 LO9 M I INCH-POUND MIL-PRF-49204B (CR) MIL-A-4 92 04A (CR) 15 October 1992 PERFORMANCE SPECIFICATION ANTENNA GROUP OE-254/GRC This specification is approved for use within the Communications- Electronics Command, Department of the Army and is available for use by all
2、Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers production engineering, test and production of a broadband omni-directional VHF antenna system to be designated Antenna Group OE-254/GRC. The OE-254 is also referenced herein as: the antenna system.
3、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 or as examples. While every effort has be
4、en made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. Beneficial comments (recommendations, addition, deletions) and any pertinent data wh
5、ich may be of use in improving this document should be addressed to: Commander, U.S. Army Communications-Electronics Command, ATTN: AMSEL-LC-LEO-E-EP, Fort Monmouth, New Jersey 07703-5023 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document
6、or by letter. AMSC N/A FSC 5985 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,- NIL-PRF-49204B 0
7、b 2042839 045 W MIL-PRF-4 920 4B (CR) 2.2 Non-Government publications. The following document(s) from a part of this document to the extent specified herein. Unless otherwise specified , the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solici
8、tation. Unless otherwise specified, the issues of documents not listed in the DODISS are issues of the document cited in the solicitation (see 6.2) Electronic Industries Associated Standard RS-329 Minimum Standards for Land-Mobile Communications Antennas, Part I - Base or Fixed Station Antennas, Dec
9、. 1966 (Applications for copies should be address to the Electronics Industries Association, 2500 Wilson Boulevard, Arlington, VA 22201-3834) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein (except for related associated specifica
10、tion or specification sheets), the text of this document takes precedent. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained . 3. REQUIREMENTS 3.1 First Article. Unless otherwise specified by the contract or purchase order, the
11、 contractor shall furnish First Article units in accordance with 4.2. 3.2 Dimensions. The outline characteristics of the Antenna Group, OE- 254/GRC shall be in accordance with figures 3 and 4 of this specification to ensure proper interface and dimensional requirements for compatibility with the fam
12、ily of antenna groups. 3.3 Parts, materials and processes. The contractor shall select the parts, materials and process but these materials shall be capable of meeting all- of the operational and environmental performance requirements specified herein. 3.4 Configuration. The configuration of every A
13、ntenna Group OE-254/GRC on order shall include the following: ITEM QUANTITY Antenna AS-3166 ( )/GRC 1 each Transmission Line 1 each Mast AB-1244 ( )/GRC 1 each Accessory Items 1 of each Ba9 1 each Running Spares 1 set 3.4.1 Transmission Line. The transmission line shall be Cable Assembly, Radio Freq
14、uency CG-1889 C/U (80 ft. O in) in accordance with the dimensional and interface requirements of Data List A3003195. The cable assembly shall consist of RG-213/U Cable terminated at each end with RF Coaxial Connector M-39012/01-007. (See 4.12.2) 2 Copyright Communications - Electronics Command Provi
15、ded by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-4 9204B (CR) 3.5 Basic Antenna. The basic antenna shall be a radio biconical design having three equally spaced elements angles upward and three equally spaced elements angled
16、 downward from a feedcone structure. A field mast assembled from mating sections shall elevate the antenna and the antenna feed arrangement. The system shall be capable of continuous duty. 3.6 Electrical Requirements. The following electrical requirements apply to the completely assembled Antenna Sy
17、stem, including the transmission line, unless otherwise stated. 3.6.1 Bandwidth. The assembled antenna system shall comply with all the following electrical characteristics, at all frequencies within the specified range of frequency coverage, without electrical tuning, switching, or physical adjustm
18、ent. 3.6.2 Frequency Range. The frequency range of the antenna system shall be at least from 30 to 88 Mhz. 3.6.3 Impedance. The reference load impedance for all measurements, at the end of the transmission line opposite the antenna, shall be 50 ohms, unbalanced to ground. 3.6.4 Free Space VSWR. Free
19、 space voltage standing wave radio for the complete antenna system, including the transmission line, shall not exceed 3.0 to 1 in the frequency range of 30 to 88 Mhz (see 4.15.1) 3.6.5 Antenna Gain. Antenna Gain over the required frequency range shall be no less than 3 dB below the gain of the refer
20、ence dipole antenna. (see 4.14.4). 3.6.6 Radiation Pattern. In accordance with the Electronic Industries Association Standard RS-329 over the frequency range of 30 to 84 MHz. Over the frequency range of 84 to 88 Mhz, the relative gain in any azimuth direction shall not vary from the mean value by mo
21、re +3 dB for 360 degrees of rotation. (see 4.11.4) 3.6.7 RF Power Level. Continuous duty RF power capability of the complete antenna system shall be 350 watts (see 4.15.3) 3.6.8 Dielectric Withstanding Voltage. Insulation material in the feedcone structure and the insulating extension shall show no
22、visible effects or evidence of dielectric breakdown due to an applied voltage of 10,000 volts after the system has been subjected to environmental stresses of the service conditions specified herein. (see 4.15.5). 3.6.9 Balun. 3.6.9.1 Power Rating. The balun shall be capable of continuous duty opera
23、tion with a continuous wave input power of 350 watts, over the frequency range specified herein. (see 4.15.4). 3.6.9.2 Coupling Loss. Coupling loss through the balun shall not exceed 0.5 dB. (see 4.15.4). 3.6.9.3 Balun VSWR. VSWR at the input of the balun connector shall not exceed 2.0 : 1 in the fr
24、equency range 30 to 88 Mhz to be consistent with the free space VSWR requirements of paragraph 3.6.4 for the complete system, when tested in accordance with paragraph 4.14.3. (see 4.15.4). 3 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reprod
25、uction or networking permitted without license from IHS-,-,- MIL-PRF-472046 M 9979906 2042823 T3 W MIL-PRF-49204B (CR) 3.7 Mechanical Requirements. The following mechanical requirements shall apply. 3.7.1 Gages, Jigs and Fixture. (see 4.13.4) 3.7.1.1 Gages. The contractor shall employ the following
26、government furnished gages to test mechanical dimensions of the applicable threaded items. GAGE LIST APPLICABLE ITEM SC-GL-3232064 SC-GS-57620 SC-SM-A-57 62 1 SC-GL-57626 Feedcone Structure Sockets MS-117 /A MS- 1 1 6 /A AB-24/GR 3.7.1.2 Fixtures. The contractor shall furnish fixtures for measuring
27、cone angle of the feedcone structure and for performing the structural integrity test of the feedcone. 3.7.2 Height. Height for the assembled antenna system from the mast base plate to the vertical center of the feedcone structure shall be no less than 30 feet and no greater than 32 feet. 3.7.3 Weig
28、ht. Weight of the complete antenna system, with all parts and the technical manual stowed in the bag, shall not exceed 45 pounds, 8 ounces. Weight of the feedcone structure, including the balun, shall not exceed 3 pounds, 6 ounces. (see 4.13.1) 3.7.4 Transport size. The outside dimensions of the clo
29、sed bag, with all items properly stowed, shall not exceed 42 inches in length and 40 inches in perimeter. (see 4.13.2) 3.7.5 Interchangeability. The system shall provide for two-way interchangeability of parts. Selection of tolerances as shown on the drawings shall permit any part selected from one
30、system, to be substituted into any other system of those on order without any problem of function or fit. (see 4.13.4) 3.7.6 Feedcone Structural Integrity. The feedcone shall be capable of Withstanding, without damage or indication of separation, a tensile force of 2000 pounds applied in a manner to
31、 separate the two cones. This 2000 pound force shall be reduced to 1500 pounds for all Group C“ environmental post- tests. The feedcone structure shall also be capable of withstanding a tensile force of 250 pounds applied at the balun unbalanced connector and to the two cones in a manner tending to
32、separate the balun from the feedcone structure. (see 4.13.5) 3.7.7 Air Pressure. The feedcone assembly shall be capable of maintaining an air pressure, applied at the air pressure test vent to test the balun seal points, to within 0.01 psi. (see 4.12.4) 4 Copyright Communications - Electronics Comma
33、nd Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-PRF-49204B 9999906 2042822 b3T H MIL-PRF-49204B (CR) 3.8 Service Conditions. As a result of being subjected to the following environmental conditions, according to the me
34、thods set forth in the test schedules, the antenna system shall not exhibit any effect which would be harmful to performance or reliability. The parts of the system shall not be deformed, defaced, frayed in any manner or exhibit evidence of corrosion. Corrosion is any visible degradation that can be
35、 attributed to flaky, pitted, blistered or otherwise loosened finish or metal surface. Harmful electrical performance is performance below the test limits stated herein. (see 4.14) 3.8.1 Temperature. 3.8.1.1 High Temperature. (see 4.14.1) 3.8.1.1.1 Operating. The antenna system shall be operable wit
36、hout degradation in specified performance and shall sustain no physical deterioration, at ambient air temperature as high as +71C (+160F). This includes effects of solar radiation at a rate of 360 BTU/ft x ft/hr. 3.8.1.1.2 Storage and Transportation. The antenna system shall withstand exposure to am
37、bient temperatures as high as +7loC (+160F). 3.8.1.2 Low Temperatures. (see 4.14.2) 3.8.1.2.1 Operating. The antenna system shall be operable without degradation in specified performance and shall sustain on physical deterioration at ambient air temperatures as low as -45.6OC (-50F) . 3.8.1.2.2 Stor
38、age and Transportation. The Antenna system shall withstand exposure to ambient temperature as low as -57C(-70F). 3.8.2 Humidity. The antenna system shall be operable without degradation in specified performance and shall sustain no harmful physical deterioration, during and after prolonged exposure
39、to extreme high humidity levels encountered in tropical areas. (see 4.14.3) 3.8.3 Fungus. The antenna system shall show no evidence of viable fungus or corrosion when subjected to environmental conditions which would be favorable to their development, namely high humidity, warm atmosphere, and prese
40、nce of inorganic salts. 3.8.4 Salt Fog. The antenna system shall be capable of operation for extended periods in the saline atmospheres of a seacoast environment without harmful structural deterioration, without degradation in specified performance, without insulator breakdown and without electrical
41、 flashover. (see 4.11.2) 3.8.5 Dust. The antenna system shall be capable of operating for extended periods in a dry, windy (17 knots), sandy environment without harmful structural deterioration, without degradation in specified performance, , without insulator breakdown and without electrical flasho
42、ver. (see 4.11.3) 3.8.6 Bounce, Loose Cargo. The antenna system, disassembled and stowed in its bag, shall be capable of withstanding shocks and exposure to wear induced during field transport as loose cargo. Some wear to the bag is expected as a result of the test of 4.11.5. However, the bag shall
43、not be frayed or torn to the extent that it ceases to perform its function of containing and protecting its contents. 5 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-LI7
44、20LIB 999990b 2042823 576 MIL-PRF-49204B (CR) 3.8.7 Drop. The antenna system, disassembled and stowed in its bag, shall be capable of being repeatedly dropped a distance of 30 inches onto any surface or edge without harmful damage to any component or to the bag. (See 4.14.5) 3.8.8 Wind/ice Load. The
45、 antenna system, when erected for field operation according to the instructions, shall be capable of withstanding 90 mile per hour winds without ice load and 60 mile per hour winds with 1/2 inch of radial ice and remain erected, without harmful damage to the feedcone structure, to the balun, or to t
46、he mast including the guy system. (Note that the test specified herein is for 90 mph winds only since this is easier to implement and performs essentially the same purpose as a combined wind/ice load test). (See 4.14.6) 3.8.9 Immersion. The antenna system, stowed in its bag (less Technical Manual an
47、d Cable Assembly CG-1889 C/U), shall be capable of being immersed to a covering of 3 feet of fresh water for a period of 2 hours. The immersion shall not result in any form of physical deterioration, loss of fit, or reduction in electrical performance below specified limits. (See 4.14.7) 3.9 Running
48、 Spares. A set of running spares shall be furnished as specified in the contract or purchase order. 3.10 Systems Safety Engineering. 3.10.1 Personnel Hazards. Personnel hazards shall be kept to a minimum. Tasks and efforts such as selection of parts, the complete manufacturing and assembly process,
49、and any product baseline configuration changes that may be implemented during the course of the contract. Verification that compliance with this requirement has been achieved shall be verified through visual inspection. 3.10.2 Corona. The feedcone structure shall be free of sharp edges and points. 3.10.3 Radioactive Materials. Radioactive materials shall not be used (e.g. luminous dials/markings, electron tubes, surge arrestors and lenses). 3.10.4 Edge Roun
