This series of webpages is designed to provide a general introduction to the ways in which coherent signals and waves can be used. There are 21 sets of pages on various topics which vary from basic radio and broadcasting techniques to the use of interferometry for source location. The level of the material included assumes that you already know a reasonable amount of basic physics and electronics. That said, each set of pages is only intended to give a simple introduction to the relevant ideas and methods. i.e. some things have been simplified to make things a bit easier. If you want more precise, fuller information, have a look at some of the many books on these topics...

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Content and pages maintained by: Jim Lesurf (
using TechWriter Pro and HTMLEdit on a RISC OS machine.
University of St. Andrews, St Andrews, Fife KY16 9SS, Scotland.