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BELL SYSTEM TECHNICAL JOURNAL 



all cases an integrating condenser is required to smooth out the d-c pulses 

 delivered by the crystal to give output indication on the d-c microammeter. 





TRANSMITTER 

 PULSE 



CLASS B 

 (INTENSITY MODULATION) 



BACKGROUND 

 NOISE 



{INTENSITY MODULATION) 



AZIMUTH ■ 



Fig. 11. — -Tj^ical ringtime patterns on radar indicators. 



The cylinder in the 9 knic band is an assembly of a tube and two end 

 plates. One of these is driven by the piston as described and the other is 

 adjustable for "leveUing" i.e., parallelism of the two plates. 



E)id Plate Gaps 



The wanted TE mode is paired with a companion unwanted TM as de- 

 scribed above. The fact that the TM mode has a Q substantially less than 

 that of the TE makes the realization of the higher Q difficult. A method is 



