SINGING ON TWO-WIRE CABLE CIRCUITS 631 



X = a symbol indicating that the two quantities in 



* decibels are combined as if their currents added 



directly. 

 E.g.. 

 Sn X 521 = ^31 means that 10-(«"/20) ^ iQ-(Sn/20) 



i 



X = a symbol indicating that the two quantities in 



" decibels so connected are combined as if their 



powers added directly. 

 E.g., 

 5iiX52i = 531 means that \Q-^snim + \Q-(Snim 

 p 



X, y = variables as used. 



djic = phase angle of current returned from the j th 



loading section in the k th repeater section. 



