ATTENUATOR 



)0 db 



.STEPS 



31 kc 



"X" 



3lkc 



DETECTOR 



PHASE 

 DIFFERENCE 

 DETECTOR 



AMPLITUDE 



DIFFERENCE 



DETECTOR 



d-c 



-^ ^ 



K 



31 kc 



3lkc 



HASE SHIFTER 

 )US 0°-360° 



d-c 



TRANSMISSION 

 INDICATOR 



