GAS-DISCHARGE TRANSM IT-RECEIVE SWITCH 



59 



it seem advisable to cnij)loy an AIR tube. The general arrangements of 

 the circuit elements in one of these systems is shown in I-'ig. 12. The 

 main wave guide section is shown removed from the rest of the equipment 



WAVE GUIDE 

 TO ANTENNA 



BEATING OSCILLATOR 

 AND PREAMPLIFIER 



■-MAGNETRON 



Fig. 11 — The wave guide system of the SL radar emi)Ioying the 721.\ tulte 



in Fig. 13 while Fig. 14 is an exploded view revealing the details of the cavity 

 construction. The two cavities are, of course, coupled to the wave guide 

 by means of windows. The wave guide branch leading to the receiver is in 



