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When is a hybrid not a hybrid?
Thanks for all the interesting replies - particularly Len's long historical narrative - and please accept my apologies for not responding immediately. The magazine article took a different course from the one that I'd anticipated, and thus took much longer to write. After all the research and reminiscence, though, we still aren't much closer to understanding why some old-time telephone engineer named this circuit a "hybrid" . We can only speculate that, before finding his true vocation with Ma Bell, he had failed both English and Genetics. In the end it seemed more important to concentrate on the defining characteristics of a modern "RF hybrid", which are coupling between some of its ports (usually equal power division), and at the same time, isolation between other ports. Even that is more of a loose consensus than a firm definition, of course. Anyhow, the article eventually started with a fairly detailed description of the telephone hybrid (which also explains why a hybrid can sometimes be called a bridge instead) and then wandered onward to identify a few RF hybrids and describe some useful applications of RF hybrids; by which point, I had used up my two pages. Thanks again to everyone who contributed - it certainly helped to straighten out my thinking on what had originally seemed such an innocent little question. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
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