PRODUCTION OF TELEVISION SIGNALS 



591 



between the line and ground. The success with which this problem 

 has been solved is shown by the curves of Fig. 22. Curve 1 is the 



100 1000 



FREQUENCY IN CYCLES PER SECOND 



Fig. 22 — Transmission characteristics of iron core transformers 



1. Output transformer connected between impedances of 2000 ohms and 600 

 ohms. 



2. Input transformer having voltage step-up of 6.5 connected between 600-ohm 

 line and vacuum tube. 



3. Input transformer having voltage step-up of 2.5 connected between 600-ohm 

 line and vacuum tube. 



50 100 500 1000 



FREQUENCY IN CYCLES PER SECOND 



5000 10.000 



Fig. 23 — Envelope delay characteristics of transformers 



1. Output transformer 



2. High ratio input transformer 



transmission characteristic of the output transformer which is designed 

 to work between impedances of 2000 ohms and 600 ohms when con- 

 nected between generator and load circuits having these values. 



