DOI:10.1049/ree.1973.0045

出版商:IERE    

年代:1973

数据来源: IET

摘要:

The environmental conditions which are present on a naval ship pose a number of problems in designing an efficient u.h.f. receiving system not normally encountered in a typical ground station. These conditions and the methods which are adopted to ensure reliable and efficient communication are described in the paper.

DOI:10.1049/ree.1973.0046

出版商:IERE    

年代:1973

数据来源: IET

摘要:

Recent developments in integrated circuit technology and proposals by the European Broadcasting Union for single-sideband broadcasting have renewed interest in the re-design of broadcast receiver structures for the long and medium wave bands. This paper outlines the requirements for an s.s.b. receiver and reviews some of the many designs for such receivers which have been published recently

DOI:10.1049/ree.1973.0047

出版商:IERE    

年代:1973

数据来源: IET

摘要:

Multipart fading on y.h.f. mobile radio links is investigated, and aerial diversity reception considered for improved reception at the mobile terminal. A 3-channel adaptive array has been built using a conventional v.h.f.-a.m. receiver modified to measure signal amplitudes and relative phases. Experimental results show the effects of typical multipath environments, and the improvement obtained with an adaptive array.

DOI:10.1049/ree.1973.0048

出版商:IERE    

年代:1973

数据来源: IET

摘要:

The sensitivity of the magnitude transfer function of narrowband cascaded filters is evaluated in terms of pole sensitivities. It is shown thatQsensitivity is often negligible in determining performance and that the worst-case sensitivity of the magnitude transfer function exhibits maxima at particular frequencies and thatQ-factor and ω0sensitivity are the dominant factors determining the sensitivity of the magnitude transfer function. The worst-case sensitivity of the cascade-realization is compared with that of the corresponding ladder realization

DOI:10.1049/ree.1973.0049

出版商:IERE    

年代:1973

数据来源: IET

摘要:

A stability criterion is defined for high-order linear systems using root-locus method. The general character of the system can be predicted by the trajectories plotted from this criterion. The sub-characteristic equations defined in the criterion afford a simple means for the design of systems with multiple adjustable parameters.

DOI:10.1049/ree.1973.0050

出版商:IERE    

年代:1973

数据来源: IET

摘要:

A transient analysis program is described which is now operational on a small computer with 16k words of store. This program, entitled SOTRAP, is able to perform low-cost time response simulation of networks which contain bipolar transistors and diodes. Details are given of the program's convenient input-data format, analysis technique and built-in device models.

DOI:10.1049/ree.1973.0051

出版商:IERE    

年代:1973

数据来源: IET

摘要:

The spectrum of impulsive noise is quite different from that of an a.m. or s.s.b. radio signal, but receivers designed to discriminate against the former have only been moderately successful.A mathematical analysis of a noise blanking receiver demonstrates the critical nature of system parameters. Signals in adjacent channels can give rise to excess noise in the wanted channel. Trapezoidal blanking functions are shown to have significant advantages, and the necessity for some means of delaying the signal before blanking is demonstrated.A noise blanking receiver incorporating an ultrasonic glass delay line is described.

DOI:10.1049/ree.1973.0052

出版商:IERE    

年代:1973

数据来源: IET