912 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1956 



SAWTOOTH 

 GENERATOR 



SYNC 



OSCILLOSCOPE 



^ 



r 



DETECTOR 



AMPLIFIER 

 f = 750 KC 



PRECISION 

 ATTENUATOR 



BALANCED TO 



UNBALANCED 



TRANSFORMER 



HYBRID . 

 JUNCTION 



[> 



\ 



-0 



BALANCED 

 CONVERTER 



X 



REED 

 KLYSTRON 



6DB 

 COUPLER 



RECORDER 



METER 



ADJUSTABLE 

 SHORT 



X 



3 DB 

 COUPLER 



ANTENNA 



Fig. 4 — Schematic diagram of frequency-modulation radar. 



Fig. 5 — Waveguide apparatus and antenna. 



