DEI.. 1 1 ■ l-\)l A I.I /.A I'lOX or ( \ I KRIEN ( 7 A'( 7 ' / 7-.V 



189 



The dissij)ative loss of these sections may he determined from the approxi- 

 mate relation 



Dissipative Loss in nc[)ers 



= 36 + 9 



(7) 



wiiere 

 R 



1 '' 

 G 



C 



resistanre-inchutance ratio of coils in ohms per henry 



= conductance-capacitance ratio of condensers in micromhos per 



microfarad 

 T = delay of network in seconds 



FLAT -LOSS 

 PAD 



NON-DISSIPATIVE 

 DELAY SECTION 



DISSIPATIVE 

 DELAY SECTION 



MINIMUM - PHASE 

 LOSS EQUALIZER 



Fig. 9 — Four-terminal equivalence showing the method of absorliing the etTecls of 

 dissipation in the audio-frequency equalizer sections. 



This expression indicates that, when the quantity {R/L + G/C) is nearly 

 constant with frequency, the shape of the loss characteristic will be gen- 

 erally similar to that of the delay characteristic. The ripples in the delay 

 characteristic have been made sufficiently small so that the corresponding 

 loss ripples may be ignored and only the general trend considered. A 

 schematic of the resulting equalizer is shown in Fig. 10. The attenuation 

 equalizer sections, in tandem with the delay sections, produce a loss char- 

 acteristic complementary to that of the band filter over the cSOt)()-cycle 

 program range. Resistors have been added to the crossarms of each lattice 

 delay section to allow the dissii)ative losses to be adjusted to the nominal 

 values assumed in the design. For manufacturing convenience, the sec- 

 tions are assembled in seven separate containers which are mounted on an 

 8f inch by 19 inch relay-rack panel as illustrated in Fig. 11. 



