i.ih-iaih' 1 1 1 1 riinxy ox nu.n j -'//./(,/ //.\/\ 



lf>7 



i(iii(l»n>«.r cliiiK'tit is m.ulc up of a large inmibcr of small coiuluiiscrs 

 ii) par.illi-l, (ho ass<'mi)ly iK'iiig immorsed in tr.insforiner oil. 



At pnsint llioso coiuloiisirs arc oiiiploNcd as the scries capacity 

 cleiuciil of a single seetion, conllueiil lyi)e, Camphell hand pass filler 

 as shown by I"ig. 22, the general attenuation characteristic being 

 shown by Fig. 1 L This filter is intended to transmit etVicienlly the 

 carrier fre<iiiencies, and to exclude power frequency currents. 



Fig. 15 — Typical Layout of Power Line Carrier Telephone System, Using Hij;h 

 Voltage Condensers for Coupling to Power Line 



In Fig. 15 is shown a typical layout of a condenser coupled power 

 line carrier telephone system. 



In employing the distributed capacity type of condenser for coupling 

 to the power line, two coupling wires (sometimes incorrectly called 

 antennae) are suspended parallel to the power conductors for a dis- 

 tance of approximately 1,000 ft. Pig. 10 shows the last tower sup- 

 porting the coupling wires in an installation at Anniston, Alabama. 

 This is a twin circuit 110 K.\'. power line and in order to secure 

 coupling to both lines, the coupling wires are suspended midway 



