WIRE TRANSMISSION SYSTEM FOR TELEVISION 



625 



these variations in the Hne characteristics it was decided to provide 

 basic networks which would equalize for dry weather conditions, and 

 to make available, in addition, several steps of equalization which 

 would compensate for changes in the direction of wet weather. 



iaooo 



FREQUENCY- CYCLES PER SECOND 



20,000 



Fig. 4 — Computed attenuation characteristics of television circuit with and 

 without equalizers 



R|= 64.35 OHM 

 C3=6.II2 Mr 



R2 = I334 OHM 

 L4 = I.I00 H. 



Fig. 5 — Low-frequency equalizing network (dry and wet weather) 



Low-Frequency Network. Computed curves of attenuation and 

 phase delay for the overall Washington- New York circuit without 

 correcting networks are shown in Figs. 3 and 4, respectively. The 



