M51 天线及其馈线 标准查询与下载

KS C 6810-1976 VHF电视接收天线试验法

이 규격은 54MHz부터 216MHz까지의 주파수 범위에서 사용하는 텔레비젼 수신 안테나의

Measurement methods of receiving antenna for VHF television broadcast transmissions

NAVY MIL-A-28729 B-1975 CU-1382( )天线耦合器组(HF, BB宽动态范围)

This specification is approved for we by all Departments and Agencies of the Department of Def ense.

ANTENNA COUPLER GROUP, CU-1382( ), (HF, BB, WIDE DYNAMIC RANGE)

NAVY MIL-A-28813-1975 AN/SRA-34A(V)天线耦合器组

This specification covers the requirements for Antenna Coupler Group AN/SRA-34A(V), an antenna coupling, radio frequency (U) switching and adapting equipment which, in functioning as the connecting link between radio equipments such as the AN/SRC-23A and standard Navy radios, and shipboard antenna systems, will provide an overall compatible shipboard high frequency Communications Systems.

ANTENNA COUPLER GROUP AN/SRA-34A(V)

ITU-T HDBK PTL CHAPTERS 1 THRU 5-1974 电信线路的保护和雷电放电装置第1章至5

Statistics of the causes of damage to telephone installations in various countries show that many breakdowns and faults are due to atmospheric discharges.Both overhead lines and telecommunication cables and associated technical equipment are subject to these effects. Early in the development of telecommunicationtechnique, great importance was attached to protection of overhead telephone lines (which predominated at the time) against lightning. With the growing use of telecommunication cables it became recognized that the latter are likewise subject to damage by lightning, although it was fìrst thought that a buried cable was sheltered from the harmful effects of atmosphericdischarges. This is true only for some of the phenomena occurring at the time of the lightning discharge.The importance of cable telecommunications has obliged engineers to go deeply into the physical Characteristics of atmospheric discharges and to draw conclusions for the efficient protection of telecommunication lines and associated equipment.Furthermore, many installations contain solid-state elements (transistors, diodes, etc.) which are much more sensitive than classical elements and which are liable to be damaged at fairly low voltages and currents.This Handbook contains a general survey of atmospheric discharge phenomena and of the protection devices in use.The theoretical explanations in the appendices to the various chapters are necessary for an understanding of the phenomena as weli as for calculating the design of protection devices. For a wider study of theory and physical phenomena, reference should be made to the numerous specialized publications. It seems best to limit the field of application of this Handbook to telecommunication lines and associated equipment.The latter also include cable and overhead lines which lead to transmitting installations,radio relay stations, etc. at high altitude, which are thus more than normally exposed. The present Handbook does not deal with the protection of the stations themselves, since such problems concern the protection of buildings against lightning and this, for transmitting stations and radio relay stations,falls within the domain of radio technique.The protection of the buildings in which the telecommunicationequipment is installed is governed by the national regulations on lightning protection

Protection of Telecommunication Lines and Equipment Against Lightning Discharges (Chapters 1 thru 5)

NAVY MIL-C-24219 A-1970 四通道自动调谐AN/SRA - 33天线耦合器

This specification covers an automatically tuned four-channel antenna coupler used to couple a group of transmitters, receivers, receiver-transmitters, or combinations thereof to a common antenna for operation in the frequency range 225.00 to 399.95 megahertz (MHz).

COUPLER, ANTENNA, AN/SRA - 33, FOUR CHANNEL AUTOMATICALLY TUNED

ARMY MIL-C-55693-1970 CU-942()/AR.CU-1894()/AR天线耦合器及AS-1703()/AR天线

This specification covers the following components, which operate throughout the range of 30.00 to 75.95 megacycles,(See 6.1 and 6.3).

COUPLERS, ANTENNA CU-942( )/AR, CU-1894( )/AR AND ANTENNA AS-1703( )/AR

SJ 20348-1993 低副瓣平板裂缝天线性能远场测试方法

Methods of far-field measurement for planar waveguide-fed slot arrays with low sidelobes

SJ 20416-1994 短波有源接收天线通用规范

General specification for active antenna systems used in short wave receivers