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Displaying Results 1 - 12 of 12
• ### The university of surrey's satellite project

Publication Year: 1981, Page(s):199 - 202
| PDF (670 KB)
• ### Oscillator design

Publication Year: 1981
| PDF (169 KB)
• ### A new service to members

Publication Year: 1981
| PDF (167 KB)
• ### Human factors of v.d.u.s

Publication Year: 1981
| | PDF (167 KB)

First Page of the Article
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• ### Standard spacecraft microcomputer module

Publication Year: 1981
| | PDF (140 KB)

First Page of the Article
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• ### Techniques for utilization of hexagonal ferrites in radar absorbers. Part 1: Broadband planar coatings

Publication Year: 1981, Page(s):209 - 218
Cited by:  Papers (12)
| | PDF (1307 KB)

The lack of suitable materials having permeabilities (Â¿r) greater than unity at microwave frequencies has previously made it difficult to design thin coatings of broadband radar absorbersat this frequency range. A possible solution is to utilize the hexagonal ferrites that exhibit significant Â¿rvalues (Â¿5) over narrow frequency bands and this paper investigates methods of deploying this materia... View full abstract»

• ### Techniques for utilization of hexagonal ferrites in radar absorbers. Part 2: Reduction of radar cross-section of h.f. and v.h.f. wire antennas

Publication Year: 1981, Page(s):219 - 225
Cited by:  Papers (3)
| | PDF (857 KB)

Coatings of hexagonal ferrites on a wire antenna reduce its back-scattering radar cross-sections (r.c.s.) at microwave frequencies without causing significant deterioration of its radiation efficiency at the h.f. and v.h. communication bands. The back-scattering r.c.s. of an infinitely long conducting cylinder coated with a multilayer of hexagonal ferrites is derived and the result modified to tak... View full abstract»

• ### Developments in frequency-response determination using Schroeder-phased harmonic signals

Publication Year: 1981, Page(s):226 - 232
Cited by:  Papers (2)
| | PDF (714 KB)

A multi-frequency identification scheme employing Schroeder-specified relative phasing to achieve low-peakfactor excitation signals has been devised. These so-calledSchroeder-phased harmonic signals have been proposed as a convenient multi-frequency signal for frequencyresponse testing offering high-power with low peak-factor and a flexible choice of test spectrum. In this paper the use of these s... View full abstract»

• ### Voiced/unvoiced band-switching system for transmission of 6 kHz speech over 3.4 kHz telephone channels

Publication Year: 1981, Page(s):233 - 235
Cited by:  Papers (2)
| | PDF (1622 KB)

A voiced/unvoiced band switching system is described for the transmission of wide bandwidth speech (here 300to 6000 Hz) over commercial telephone channels. Timewaveforms and spectrograms are presented to demonstrate that the 6 kHz speech can be compressed into a 3-4 kHz telephone channel and yield improved speech quality at the receiver compared to current telephone quality speech. Informal listen... View full abstract»

• ### Structured magnetic media for data security

Publication Year: 1981, Page(s):236 - 240
| | PDF (1045 KB)

A method is described of structuring or freezingÂ¿ digital encoding into a magnetic tape so that it is permanent and non-erasable. It is then shown how normal or softÂ¿ magnetic encoding can also be recorded on such a tape, and ensure the integrity of the normal encoding. It is further shown how structured tape may be fixed to the cards and documents to make them secure and machine readable. View full abstract»

• ### Some novel elements for delta-modulated signal processing

Publication Year: 1981, Page(s):241 - 250
Cited by:  Papers (1)
| | PDF (886 KB)

New and interesting multipliers are proposed to use for the direct-multiplication of delta-modulated signals by constants. In addition to a non-recursive form, three recursive-form delta multipliers are given. The recursive multipliers are suitable for multiplication by periodic numbers or by non-periodic numbers which can be approached by periodic ones. A significantly smaller number of delta add... View full abstract»

• ### Book review: Early Radio Wave Detectors

Publication Year: 1981
| PDF (130 KB)