Not 30'is but early 40'is: N. PL- and
Belling-Lee connectors should
have died that moment when N and BNC where born.
PL-259oids are much cheaper to make than Ns. They also adapt easily to
lots of types of coax, provided one uses the proper nut is used on the
rear (which many people just leave off anyway). Ns have lots of picky
little bits.
--
Will