How Radio Signals Work Jim Sinclair Pdf
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How Radio Signals Work
Author: Jim Sinclair
language: en
Publisher: McGraw Hill Professional
Release Date: 1998-02-22
Shortwave, Microwave, radars, satellites and beacons.
How Radio Signals Work
For radio equipment users who want to gain a basic understanding of the way signals work, this text is written in easy-to-understand language for those with only a brief knowledge of electronics or mathematics. Topics covered include magnetic and electric fields, various bands of the radio spectrum such as VHF and UHF, aerials and antennas, propagation of signals, tuning and filters, hazards and faults, power transmission of radio signals, and basic physics-electrons, amps, watts and volts. The book also explores radio signals including broadcasting, mobile communications, aeronautical, marine, short wave, television, satellites, microwaves, radar, radio-location, beacons, telemetry, digital radio, radio astronomy, time signals, spark transmission, tropospheric scatter and underground scatter.
Radio Signals Masked by Noise
"Examination of the widely-accepted statement that signals weaker than thermal noise are useless shows it to be inadequate. By definition of information transfer in terms of probability theory, and application of Bayes' Theorem, a new general formula for the information which can be received in a given bandwidth and time in the presence of any amount of noise is obtained. Some special cases and deductions follow, one of which is that signals weaker than thermal noise are not useless. Consideration is given to the design of a weak-signal detector, operating on changes of distribution produced in some property of the noise by the presence of signals. Experimental operation of such a statistical detector is roported for signal-to-noise ratios of less than one. Early papers on radio noise are discussed briefly: the bibliography is .extensive. Improvement of maximum radar ranges on small targets is suggested among the problems for further research." --