MAXIMUM CIRCUIT LENGTH , Lq.IM M'LES (FOR 1 DB PcR MILE") 

 200 400 600 1000 2000 4000 10,000 40,000 



100,000 



10 



40 60 100 200 400 600 1000 2000 4000 10,000 



OPTIMUM NUMBER OF SPANS , Pq 



Fig. 29 — Optimum number of repeater sections and maximum circuit length for metal- 

 lic AM system with fixed power capacity and noise figure. 



MAXIMUM CIRCUIT LENGTH, Lo, IN MILES (FOR 1DB PER MILE) 

 100 200 400 600 1000 2000 4000 10,000 2 40,000 



45 



100,000 



40 60 100 200 400 600 1000 2000 4000 10,000 



OPTIMUM NUMBER OF SPANS, Ho 



Fig. 30— Optimum number of repeater sections and maximum circuit length for metal- 

 lic FM system with limiting only at end of system. 



570 



