00483nam a2200181   450000500170000000600040001700700040002100800040002502000150002905000250004410000210006924500520009025000160014226000420015830000180020050000500021865000330026820260217073452.0000000000  a0333333446  aTK5101.A3b.C6 1975.  aCoates, R. F. W.  aModern communication systems :cR. F. W. Coates  a2nd edition  aLondon :bMacmillan press Ltd,cc1975  axii, 398 p. :  aIncludes bibliographical appendices and index  amodern communication systems