CARRIER IN CABLE 



257 



In practice, balancing at only one point in a repeater section (which 

 may be an intermediate point or either extremity) serves to make 

 possible considerable reduction of the crosstalk. In the Morristovvn 

 setup balancing arrangements were applied at an intermediate point 

 in the cable and found to be entirely adequate for the frequency range 

 involved; in fact, transmission of considerably higher frequencies would 

 have been possible without undue crosstalk. Other tests have indi- 

 cated that, thanks to these balancing means, the 19-gauge quads used 

 in the Morristown cable for separating the 16-gauge pairs from each 

 other can probably be dispensed with, even for frequencies considerably 

 above those used in the trial. 



The photograph of Fig. 5 shows the experimental panel on which 

 the circuits were brought together for balancing. This panel was 







~v.:-" !■» > ■ •" ■ '• ■I] 







Fig. 5 — Special crosstalk balancing panel. 



installed in a weather-proof hut near the center of the 25-mile repeater 

 section. By this means all pair to pair combinations in the group to 

 be balanced were brought into proximity so that the leads to the 

 balancing devices could be kept short. The actual balancing was 



