RADAR ANTENNAS 



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Fig. 60— AX/.\PS-4 Antenna. 



16.2 The SCR-520, SCR-717 and SCR-720 Antennas-' 



The antenna shown in Fig. ol is typical of the type used with the SCR-520 

 and SCR-720 aircraft interception (night fighter) airborne radar equip- 

 ment, as well as the SCR-717 sea search and anti-submarine airborne radar 

 equipment. The parabolic reflector is 29 inches in diameter and produces a 

 radiation beam about 10° wide. The absolute gain is approximately 25 

 db. RF energy is supplied to a pressurized emitter through a pressurized 

 transmission line system which includes a rotary joint located on the ver- 

 so Written by J. F. Morrison, 



