. The Bell System technical journal . ed, the exact exposure time being controlled by impulsesderived from the azimuthal scanning mechanism of the radar antenna. Thephotographic recording of radar displays has become a matter of prime im-portance in the modern military operations and has added another consid-eration for the military radar indicator designer. Figure 44 indicates an equipment arrangement of a PPI indicator asemployed in the AN/APQ-13 radar bombing system. In this system theindicator is designed for convenient overhead mounting in the restrictedradar operating space available in
. The Bell System technical journal . ed, the exact exposure time being controlled by impulsesderived from the azimuthal scanning mechanism of the radar antenna. Thephotographic recording of radar displays has become a matter of prime im-portance in the modern military operations and has added another consid-eration for the military radar indicator designer. Figure 44 indicates an equipment arrangement of a PPI indicator asemployed in the AN/APQ-13 radar bombing system. In this system theindicator is designed for convenient overhead mounting in the restrictedradar operating space available in modern bombing aircraft. The deflectioncoil in this equipment is rotated about the neck of the 5 diameter long-persistence cathode-ray tube by a geared selsyn motor energized from asimilar selsyn unit mechanically linked to the rotating radar antenna. Per-manent magnet focussing and centering is employed in this particular indi-cator. Figure 45 illustrates a somewhat similar packaging arrangement for 772 BELL SYSTEM TECHNICAL JOURNAL. -ILLUMINATED COURSERAND SCALE Fig. 43.—ATechanical arrangement of a radar indicator viewing and photographicattachment for AN/APQ-7 radar bomliing equipment. SCALE-ILLUMINATION CONTROL r-CATHODE-RAY TUBE indicator housing j(cover removed) RUBBER [gasket VISOR CLAMP VISOR
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
