AIR FORCE MIL-A-5999 B-1973 ANTENNA SUBSYSTEM FOR AIRCRAFT MARKER BEACON EQUIPMENT GENERAL SPECIFICATION FOR《航空器标记灯塔设备天线子系统一般规格》.pdf
《AIR FORCE MIL-A-5999 B-1973 ANTENNA SUBSYSTEM FOR AIRCRAFT MARKER BEACON EQUIPMENT GENERAL SPECIFICATION FOR《航空器标记灯塔设备天线子系统一般规格》.pdf》由会员分享,可在线阅读,更多相关《AIR FORCE MIL-A-5999 B-1973 ANTENNA SUBSYSTEM FOR AIRCRAFT MARKER BEACON EQUIPMENT GENERAL SPECIFICATION FOR《航空器标记灯塔设备天线子系统一般规格》.pdf(15页珍藏版)》请在麦多课文档分享上搜索。
1、Fs/-ab MIL-A-5999B( USAF) 12 October 1973 SUPERSEDING 30 April 1958 MILA- 5 999A( USAF) MILITARY SPECIFICATION ANTENNA SUBSYSTEM FOR AIRCRAFT MARKER BEACON EQUIPMENT GENERAL SPECIFICATION FOR. 1. SCOPE 1.1 test requirements for an antenna subsystem used with VHF marker beacon equipment in the spot f
2、requency of 75 MHz. This specification covers the general design, performance, and flight 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIO
3、NS Feder al LP-383 Plastic Material , Polyester Resin, Glass Fiber Base , Low Pressure Laminated Mi lit ary MIL-E-5400 MIL-E-O MIL-C- 4 5 662 t Electronic Equipment, Airborne, General Specification For Electromagnetic Compatibility Requirements , Systems Calibration System Requirements FSC 5826 A Pr
4、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-5777B 5ii W 7777706 0348023 O U MIL-A-5999B( USAI?) STANDARDS Military MI L-S TD- 4 90 MIL-STD- 810 Environmental Test Methods MIL-STD-831 MIL-STD- 877 Specification Practices Test Reports , Prepara
5、tion of Antenna Subsystems, Airborne, Criteria For Design and Location of (Copies of specifications , standards, drawings , and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting office
6、r.) 3. REQUIREMENTS 3.1 First article inspection. This specification makes provisions for first article inspection. 3.2 General documents. The requirements of MIL-STD-877 apply as requirements of this specification. The requirements of MIL-E-5400 apply to antenna components containing electronic cir
7、cuitry. When the general documents conflict with this specification, this specification shall govern. 3.3 Design and construction. The antenna subsystem specified herein shall be designed to be compatible with the VHF marker beacon requirements for the weapon system under consideration. The antenna
8、subsystem may be a separate item or may be installed as an integral part of the aircraft. The mtenna subsystem may be in physical combination with other frequency range antenna subsystems, thus serving two or more equipments. If the antenna subsystem is made in combination with other antenna subsyst
9、ems, it shall be possible to operate the equipments simultaneously, and with no interference, one with another. 3.3.1 Antenna subsystem composition. The antenna subsystem shall include all components, such as receiving elements , transmission line , matching devices, filters, and switching devices,
10、that are connected in the system beyond the output connector of the associated equipment. 3.3.1.1 Antenna receiving elements. The antenna receiving elements shall consist of cavity, dipole, array, or other elements suitable for installation in the aircraft weapon system consistent with the position
11、in which it is to be installed. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-5939B 58 979790b 0148024 2 7 3.3.1.2 Transmission line and connectors. The antenna subsystem shall be so designed and installed that connection can be readily mad
12、e to the associated radio equipment through a minimm length of radio-frequency cable. R-f cable and associated connectors shall be subject to prior approval by the procuring activity. antenna element and the r-f cable shall satisfy the environmental requirements specified herein. The maximum allowab
13、le loss between the receiver and antenna element shall not exceed 2 dB. The use of standard cables and connectors shall in no way be construed as justification for exceeding the maximum allowable attenuation stated herein. The method used in effecting electrical connection between the 3.3.1.3 Struct
14、ural plastic materials. The requirements for type II materials of L-P-383 shall apply for all structural plastic materials used in the antenna subsystem covered by this specification. 3.3.2 Flush antenna designs. with the skin shall be designed for a given aircraft location only when standard curved
15、 shapes are not applicable. Flush antennas of special curvature to mate 3.3.2.1 shall not be used-to obtain a mating surface with the aircraf% skin. Plastic cover plates, not an integral part of the flush antenna, 3.3.3 Aerodynamics 3.3.3.1 elements into the airstream when installed on the aircraft,
16、 shall be minimized by proper shape design. 3.4 Performance The total aerodynamic drag, resulting from the protrusion of antenna 3.4.1 Electrical requirements 3.4.1.1 Frequency. spot frequency of 75 MHz. 3.4.1.2 Polarization. When properly installed on an aircraft, the antenna subsystem shall receiv
17、e signals from directly beneath the aircraft that are polarized parallel to the fore and aft axis of the aircraft. 3.4.2.3 VoXtage standing wave ratic (VSWR). The antenna subsystem shall be so designed and installed that the VSW produced on any part of the interconnecting radio frequency transmissio
18、n line shall not exceed 1.5 : 1 at 75 MHz With reference to a nominal 50-ohm level. shall be maintained within a 5:i VSWR circle with the antenna fixed tuned. When subjected to extreme service conditions, the antenna subsystem shall not go beyond 2.5 :1 VSWR at 75 MHz. The antenna subsystem shall be
19、 designed to cover the A bandwidth of 300 kHz 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-5777B 58 777770b 0348025 4 m 3.4.1.4 Efficiency. The minimum acceptable sensitivity in voltage of the antenna subsystem shall be within 10.5 dB of t
20、hat of a half-wave dipole at a freqi*ency of 75 MHz. 3.4.1.5 Radiation pattern requirements. The radiation pattern shall be essentially a lobe without deep nulls so that the maximum gain of the antenna subsystem is downward from the aircrart and in a direction not more than 10 degrees from a vertica
21、l line through the antenna subsystem. All external store configurations that are proposed or normally carried operationally shall be consi dered separately. 3.4.1.6 Interference acceptability level. The interference of other electronic equipment with the antenna subsystem operating with the marker b
22、eacon receiving set shall be considered to be at an acceptable low level when the operation of other electronic equipment in the aircraft does not give.erroneous marker indication throughout the flight profiles specified in section 4 herein. 3.4.2 Environmental conditions. Unless otherwise specified
23、 for a particular weapon system, the antenna subsystem, including all components thereof, shall withstand the environmental requirements defined under 4.4.3.3 without reducing the performance below the limits specified herein. In addition to the environmental conditions specified above, the antenna
24、subsystem shall be designed and constructed to withstand the severest environmental conditions existing in the area of the aircraft in which it is installed. Vibration, shock, extreme temperatures, effects of gunfire or other armament originating within the aircraft or resulting from flight conditio
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