SOME APPLICATIONS OF TYPE "J" CARRIER SYSTEM 361 



Conclusion 



Upon completion of the buildings, equipment installation, and line 

 facility rearrangements, adjustments in the equipment were made to 

 match the lines used. Networks associated with the terminal and 

 intermediate amplifiers were adjusted so that the amplification for any 

 particular frequency would be equal to the attenuation at that fre- 

 quency in the preceding repeater section; the automatic pilot channel 

 equipment^ compensates for attenuation changes. In repeater sections 

 containing long toll entrance cables, it was necessary to sacrifice range 

 of automatic pilot channel control to obtain the best equalization. 

 However, satisfactory equalization and range of pilot channel control 

 were obtained in every case. 



As mentioned previously, the Dallas-Longview system operates on 

 twelve-inch spaced phantomed wire. In Fig. 16 the attenuation 



30 40 50 60 70 80 90 100 110 120 130 140 150 



FREQUENCY- KILOCYCLES PER SECOND 



Fig. 16 — Attenuation of two twelve-inch spaced phantomed pairs of the Edgewood- 

 Longview repeater section. 



1 Loc. cit. 



