FIRE-CONTROL RADARS FOR NAVAL VKSSELS 



27 



flow of azimuth data will be obtained if the operator continuously maintains 

 equal amplitude of the two "i)ips". 



In the Signal Corps equipment to which reference has been made, sep- 

 arate antennas were used for transmission and recci)tion with lobe switching 





Fig. 24 — Radar Mark 3 antenna (3' x 12') on Cruiser San Francisco after Pacific battle 



(Navy Photo 34133) 



applied only to the receiving antenna. Space limitations aboard ship 

 made it mandatory to accomplish all functions using a single antenna. 

 This required the development of a lobe switching device capable of with- 

 standing the high peak power during the transmitted pulse; a problem 

 which had not been faced in the Signal Corps equipment. It was further 

 desired to provide a weatherproof lobe switching device, free from radio 



