DOI:10.1049/ree.1965.0103

出版商:IERE    

年代:1965

数据来源: IET

DOI:10.1049/ree.1965.0104

出版商:IERE    

年代:1965

数据来源: IET

摘要:

A microwave ferrite device becomes a switch when actuated by a pulsed magnetic field. Because of the changing magnetic field, eddy currents are induced in the waveguide walls which results in a certain degree of shielding. In this paper, a criterion is given for the shielding effect of the waveguide walls to sinusoids to meet the switching response in the time domain when the field is applied through a long solenoid. It is also shown that the criterion can be obtained from inductance measurements. In this way the switching response can be specified in terms of the frequency response, thereby greatly facilitating design.

DOI:10.1049/ree.1965.0105

出版商:IERE    

年代:1965

数据来源: IET

摘要:

The requirements for a seismic recording system are stated for sites with a noise level of the order of 1 mμm displacement at a frequency of c/s.Two methods developed for the transmission of the electrical outputs from seismometers distributed over a large array to a recording centre in the field are described. The first method involves direct transmission of the amplified signals, and the second uses amplitude modulated tones. The methods used for remotely calibrating the seismometers and associated field amplifiers are described. Problems of lightning and animal damage to cables are discussed.An outline of the instrumentation used in the recording centre is given. The signals are recorded on a primary 24-track magnetic tape. The system also includes a secondary tape deck, and an eight-channel pen recorder, controlled by an on-line correlator. Details are given of the timing system, including the pulse code adopted, and the method of measuring and correcting errors relative to G.M.T.

DOI:10.1049/ree.1965.0106

出版商:IERE    

年代:1965

数据来源: IET

摘要:

A notably comprehensive and sophisticated air traffic control simulation system based on a powerful digital computer is due to be supplied to Eurocontrol in 1966. The operational facilities provided are outlined, followed by a discussion of the functions, equipment and computer programs, and a detailed description of some of the engineering problems. These include the flicker-free display on cathode-ray tubes and on a large screen of large quantities of simulated radar, synthetic and tabular data, and the simulation of realistic radar displays and comprehensive telecommunication facilities. Some possible uses of the system are also discussed.

DOI:10.1049/ree.1965.0107

出版商:IERE    

年代:1965

数据来源: IET

摘要:

This note describes how the process of converting binary-coded decimal numbers to binary may be speeded up by reducing the number of additions necessary.

DOI:10.1049/ree.1965.0108

出版商:IERE    

年代:1965

数据来源: IET