!-29] 



SEARCH LOOP MECHANIZATION 



449 



resolver and a potentiometer on the antenna. The latter is not shown, but 

 it is impHed in the summing symbol in Figs. 8-29 and 8-34. Wire-wound 

 potentiometers may be used in each channel, but induction potentiometers 

 are preferred (especially if the loop gain is high) to prevent oscillations 

 between potentiometer wires. 



Note: a = l Produces 

 Simplest Form 



' — ^^^H!;^ 





2 / 1 1 \ 1 



^ ^HRsCz c^rJ'^ C2C1R1/! 



( q^C,+ R3C, + R3C, l R, 



^ y R^ + Rg / (Ri+R2)CiC2Ri(i 



Design Formulas 



Ci= arbitrary '^2~'^iVa~/ 



K = (W4 + C05-a)2j(-^) 



"4 , 



Ifi 



'^^ (ciRj-'CgRj + C3C1R1R4 



e, (s+o:^){s + o^^) 



(b) 



VC3R1 + C3R2 ^ C3R4 c^rJ C1C3R1R2R4 



Cj = arbitrary 



Design Formulas 



C ^1 



3 R2(W4CO3-a;jC02) 



(C04COg-C0iCO2) 



(oj4 + a)5)(c0j + a;2) 



SRC 

 >R SRC + 1 



(d) 



Fig. 8-35 RC Compensation Networks. 



