DLA MIL-DTL-49295 C-2013 ANTENNA GROUP OE-303( ) GRC.pdf
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1、AMSC N/A FSC 5985 MIL-DTL-49295C 20 June 2013 SUPERSEDING MIL-DTL-49295B 16 October 2006 DETAIL SPECIFICATION ANTENNA GROUP OE-303( )/GRC This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a broadband dir
2、ectional VHF antenna system to be designated as Antenna Group OE-303( )/GRC. The OE-303 is also referenced herein as: The antenna system. 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 d
3、ocuments cited in other sections of this specification or recommended for additional information or 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、4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these docum
5、ents are those, cited in the solicitation or contract (see 6.2). DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-14072 - Finishes for Ground Based Electronic Equipment. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 - Electronic and Electrical Component Parts. MIL-STD-252 - Classification of Visual and Me
6、chanical Defects for Equipment, Electronic, Wired, and Other Devices. MIL-STD-810 - Environmental Engineering Considerations however, final acceptance and shipment will be withheld until group C re-inspection results have shown that the corrective action was effective. 4.4.3 3 Re-inspection of confo
7、rming group C sample units. Unless otherwise specified, sample units which have been subjected to and passed group C inspection may be accepted on the contract or order provided all damage is repaired and the sample units are resubjected to and pass groups A and B inspection. 4.5 Electrical performa
8、nce. 4.5.1 Antenna array. The contractor shall perform the following tests on the antenna system to demonstrate performance in accordance with the specification requirements. 4.5.1.1 Free space VSWR. The test shall be in accordance with TIA-329 except that the measurement shall be performed with a v
9、ector impedance meter or other instrument of equivalent accuracy (see 3.4.2.4). 4.5.1.2 RF power capability. The antenna system shall be installed using a metal mast. To electrically include the mast insulator in the test, a ground connection shall be completed between the support mast section and t
10、he ground side of the input matching transformer ground connector. Three hundred and fifty (350) watts of power shall be applied to the assembly at the input matching transformer connector. The power source shall be a continuous wave, radio frequency source having a nominal output impedance of 50 oh
11、ms. The test frequency shall be at a high end of the specified frequency range. Power shall be applied for a period of 30 minutes. During the period when power is applied, the insulation material shall be observed for evidence of RF flashover or leakage. After power is removed the insulation materia
12、l shall be inspected for evidence of RF flashover or leakage. Evidence of RF flashover or leakage shall constitute a failure. The test shall be completed within 1 hour of the time of completion of exposure to the environmental condition (see 3.4.2.7 and 4.10). 4.5.1.3 Matching transformer power. For
13、 convenience of test instrumentation, two matching transformers are employed in the test with the balanced sides joined together by the shortest possible connections. Both matching transformers are subjected to the service conditions and the results are adjusted to account for the doubling to effect
14、s of the test. Power from a radio frequency source having a 50 ohm output impedance shall be fed to the coax connector of one matching transformer through an in-line RF wattmeter capable of measuring forward and reverse power. The coax connector of the second balun shall be connected to an RF wattme
15、ter having a 50 ohm load impedance. The signal source shall be adjusted to supply 200 watts forward power at the in-line wattmeter. VSWR shall be measured at the in-line wattmeter and coupling efficiency shall be observed by measuring power at the load wattmeter (see 3.4.1, table II). 4.5.1.4 Dielec
16、tric withstanding voltage. The antenna system shall be subjected to the test in accordance with method 301 of MIL-STD-202 (see 3.4.2.9). 4.5.1.5 Antenna gain test. The relative power gain of the antenna compared to a half-wave dipole, adjusted to resonance, shall be measured. The gain of the array a
17、nd dipole shall be recorded and compared at 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, and 88 MHz. The gain shall meet the requirements of 3.4.2.5 with the test conducted in vertical polarization. The requirements of 3.4.2.6 and 3.4.2.8 shall also be satisfied (see 3.4.2.5, table III). Provided
18、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49295C 10 4.5.2 Antenna impedance. The antenna impedance shall be measured over the frequency range of the antenna (30 to 88 MHz) by use of a vector impedance meter or similar device. The measurement sh
19、all be made with the antenna properly erected and terminated. A dummy load shall then be designed having the same impedance variations across its terminals as the measured antenna impedance. A drawing shall be provided with the test plan showing the design of the dummy load which represents the resi
20、stive and reactive components of the antenna impedance for the complete required frequency range. Alternatively, a series of dummy loads may be designed for the same purpose and drawings for each shall be attached to the test plan (see 3.4.2.3, table II). 4.5.3 Radiation pattern. The antenna system
21、shall be subjected to the test of 4.3 of TIA-329 with pattern measurements recorded at 5 MHz intervals starting at 30 MHz. Patterns in elevation and azimuth of E and H planes shall be made with the antenna oriented for vertical polarization. This test shall demonstrate compliance with 3.4.2.6 and 3.
22、4.2.8. 4.5.4 Transmission line and dissipation transmission line. A reflectometer shall be used to test the correct impedance and continuity (see 3.4.2.3, table II). 4.5.5 Matching transformer VSWR. The antenna impedance test of 4.5.2 must be completed before the matching transfer test can be conduc
23、ted. The dummy load, designed as specified in the antenna impedance test of 4.5.2 shall be placed across the antenna wire assembly connector of the matching transformer. VSWR shall be measured at the matching transformer coaxial connector using commercially available equipment having a load impedanc
24、e of 50 ohms, and having the capability of displaying VSWR over the complete required frequency range. VSWR shall be observed over the complete range and recorded at the frequency having the largest VSWR (see 3.4.1.2, table II). 4.5.6 Coupling loss. For convenience of test instrumentation, two match
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