APPARATUS UNDER TEST 



X MODULATOR 



->-» 



«-► 



OW^ 



MASTER OSCILLATOR SLAVE OSCILLATOR 



RANGE 

 ATTENUATOR I 



50 TO 3600 kc 

 4 



SYNCH 

 05C 

 f+31kt 



F.3lkc 



■>— * 



♦-►■ 



MEASURING ATTENUATOR 



0-60 db 

 0.1 db. STEPS 



PHASE 

 INDICATOR 



DETECTOR 



^<t 



PHASE 

 DIFFERENCE 

 DETECTOR 



AMPLITUDE 

 DIFFERENCE 

 DETECTOR 



'i>- 



^ 



y 



RANGE 

 ATTENUATOR JL 



0^|3 



H 



t> 



TRANSMISSION 

 INDICATOR 



S MODULATOR 



Fig. 2— Uluck schcmalic of the phase and tra 



MEASURING PHASE SHIFTER 

 CONTINUOUS 0°-360° 



