DOI:10.1049/ree.1971.0115

出版商:IERE    

年代:1971

数据来源: IET

摘要:

The concept of gravitational radiation is introduced and the experiments of Weber are described. The magnitude and nature of the phenomenon are discussed in the light of Einstein's theory of relativity. The basic theory of a detector is developed and the means of realization are indicated. Investigations are proceeding along these and parallel lines in many parts of the world but no definitive results have yet been reported.

DOI:10.1049/ree.1971.0116

出版商:IERE    

年代:1971

数据来源: IET

摘要:

The pulse under investigation and a timing wave consisting of a succession of narrow triangular pulses of controllable frequency are simultaneously displayed on a double-beam sampling oscilloscope. Adjacent timing pulses are aligned to the leading and trailing edges of the pulse being measured; the duration of the pulse, being then identical with the period of the timing wave, is obtained from a digital frequency meter monitoring the timing-wave frequency. Pulse durations in the range 20 to 100 ns may be determined with an uncertainty of ± 100 ps. For pulses of durations extending to several microseconds the uncertainty is within ± 0.1%. The method has particular application in pulse-bandwidth measurements on television and other waveform transmission systems having pulse bandwidths in the range 125 kHz to 25 MHz. Using ancillary amplitude-measuring equipment, such measurements can be accomplished with uncertainties of ±1% or better.

DOI:10.1049/ree.1971.0117

出版商:IERE    

年代:1971

数据来源: IET

摘要:

The paper describes the electrical behaviour of multi-cavity klystrons, now extensively used as high-power amplifiers in u.h.f. television transmitters. The factors affecting the frequency response are reviewed, with descriptions of the particular conditions required for output coupling and cavity tuning. The response of the klystron to the television tests for non-linearity is discussed in detail, and it is suggested that (a) differential phase shift is produced by the basic a.m.-p.m. characteristic of the tube; and (b) the discrepancy between observed results of line-rate linearity and differential gain tests is due to differing amplification of single and double sidebands, to be expected with any non-linear transfer characteristic. This discrepancy can be removed by suitable signal processing in the transmitter.

DOI:10.1049/ree.1971.0118

出版商:IERE    

年代:1971

数据来源: IET

摘要:

A neutrally buoyant instrument able to measure and record vertical flow, water temperature, and pressure at any oceanic depth for extended periods is described. Principles of operation, design of the measurement, recorder, recovery, acoustic telemetry, and relocation sub-systems are discussed. Special features of the electronic design are very low power consumption and circuit flexibility to adapt the instrument to a range of oceanic experiments.

DOI:10.1049/ree.1971.0119

出版商:IERE    

年代:1971

数据来源: IET

摘要:

The paper describes the design and practical considerations involved in coupling a small digital computer to work on-line with a chemical research n.m.r. spectrometer. The various requirements of spectrometer, computer, interfacing and programming are dealt with both in general terms and in relation to the specific system employed in the present project. The effectiveness of the practical system is assessed, and some typical results are included.

DOI:10.1049/ree.1971.0120

出版商:IERE    

年代:1971

数据来源: IET

摘要:

A series of linear elements are used to create a graphical display of a quality adequate for visual inspection. The graphic alpha-numeric character store described is a specially-constructed fast, pre-wired, closed magnetic path, transformer, read-only memory. However, the graphical techniques discussed could well be implemented by other storage methods. Experimental results and simulated displays are presented as an indication of the viability of the system. An automatic wiring machine has been developed to manufacture the store.

DOI:10.1049/ree.1971.0121

出版商:IERE    

年代:1971

数据来源: IET

DOI:10.1049/ree.1971.0122

出版商:IERE    

年代:1971

数据来源: IET