By Roger Hargreaves, Mark Fletcher
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Extra info for The New Making Polite Noises: Social and Functional English for Communication!
Example text
14 Radio characteristics by frequency band f) The frequency distortion suffered by wideband signals. At certain times it may be impossible to obtain a satisfactory propagation path at all, for periods (depending upon path geometry) ranging from a few minutes to several hours. The operational use of HF must, therefore, take into account the statistics of the availability of a given link before relying upon HF in a particular role, although it is often the case that no alternative communications path can be provided.
It is the redistribution of energy vertically in the vicinity of the boundary that accounts for the recovery effect. 13) path. In the vicinity of the boundaries, rapid variations in field strength may be experienced over short distances. 5 Sea State For propagation over sea, surface irregularities are defined in terms of sea state[25]. An extra transmission loss can occur which increases with the prevailing wind speed and hence with the wave height. 14 shows the typical extra attenuation caused by rough sea conditions.
4 Mixed Propagation Paths In practice, propagation paths often cross terrains of differing conductivity— especially paths that pass over both land and sea. In order to quantify the effect of propagation over mixed terrain a number of examples have been computed using the method given by Millington[24]; this method is in very good agreement with experimental results for an inhomogeneous smooth Earth. Consider the case of a two-terrain type path. Let E1(d), E2(d) be the field strengths in dBµ V/m produced at a distance d over terrain types 1 and 2 respectively.
