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Radio Record, Volume I, Issue 19, 25 November 1927, Page 13

When a three-cirenit (primary sete ondary, and tickler windings) having fixed coupling (the coupling is deters mined bv the distance between the pris mary and secondary windings) is, cone structed, the builder has to choosé whether to place the primary and sece ondarv windings close together (tight coupling) and get good volume of music but poor selectivity; or to place them farther apart {loose coupling) and get good selectivity but not so much yok ume ‘The best placing of the primary and secondary will have to be found by experiment, because the proper devreé of coupling depends, to a ereat extent, on the nearness to powerful broadcasts ing stations. Tither. volume will have tn he sacrificed for selectivity, or vicé versa.