Show i il t fejt M 1 I k eli malej lim d it L I 1 I 1 I 1 4 J r 4 St stanlon atlon hit bif y A alter r or wave trap which will eliminate station cea 0 in a the illustration its construction q Is pimple there fiehn beang only anly i two vart art although thos I 1 adjustment of this filter id somewhat complicated Ho boc once L 1 adjusted i ed it needs no further handlang br dial twisting thea I 1 parts p necessary ec essary tor ahls way ite are as follows ii 0 1 I 1 I 1 variable condenser mt low I 1 J oie O 1 I I 1 1 I 1 variable condenser mt lowi I 1 loss loss type I 1 I 1 I 1 variable resistance qed 0 0 time ohma i I 1 2 A tubes 8 inches cinches to in diame 1 ter long pound no 22 ISO vitre ll 11 consists of os 55 turns turn wound on orie one of the tubes LS la I 1 45 5 turns wound I 1 on anthi th remalia remaining ng tube agis igis wound on on to top ot of L LS 1 but Is ii separated from kt by a 11 of empire cloth ar or waxed paper arid and has ten turns cl 01 Is the I 1 I 1 61 variable condenser the theory of this wave trap Is as follows follow a the incoming signal flowN through colls ti and 12 the circuit comprising li and cl 01 Is 6 turned to the frequency of the interfering station and the condenser Is then set at tt tion itha circuit including deluding ca and CS Is 14 what Is commonly termed an absorption circuit the condenser of this ahli circuit I 1 to is rotated until the signal ol of the interfering station la Is heard beard at s minimum um strength the cli circuit cult when I 1 7 10 on ANT apt ST cl LZ I 1 ll 11 R 17 LS ca I 1 I 1 Effi efficient cent wave trap which can bt B constructed at low cost coat in resonance with the interfering station will absorb almost all of the energy ergy y received from that station the energy is received from coll coil 12 which 1 Is closely coupled to 13 and Is also closely coupled to ll LI in this way signals of other stations alu ill be allowed to past pass through but that of the interfering station Is dissipated in the absorption circuit the resistance resistant resi stane 0 across ll LI and ol 01 serves as a static leak and Is to obtain the best adjustment possible radio news |