. The Bell System technical journal . junction box(cover removed) Fig. 44.— Indicator design for .VN/AlQ-13 radar homhing eciuipment. THE RADAR RECEIVER 773 an airborne radar low-altitude bombing equipment as employed extensivelyduring the past war. Here the display employed is of the B variety utilizinga 5 long-persistence cathode-ray tube. The focussing and centeringmagnetic fields here are produced by coils located as shown. The azimuthsweep voltage is obtained by means of a potentiometer mechanically gearedto the sector scanning antenna. The permanent off axis deflection of thezero range l
. The Bell System technical journal . junction box(cover removed) Fig. 44.— Indicator design for .VN/AlQ-13 radar homhing eciuipment. THE RADAR RECEIVER 773 an airborne radar low-altitude bombing equipment as employed extensivelyduring the past war. Here the display employed is of the B variety utilizinga 5 long-persistence cathode-ray tube. The focussing and centeringmagnetic fields here are produced by coils located as shown. The azimuthsweep voltage is obtained by means of a potentiometer mechanically gearedto the sector scanning antenna. The permanent off axis deflection of thezero range line of the B display is here obtained by the use of a permanentmagnet yoke mounted at the junction of the neck and bulb of the cathode-ray tube. Figure 46 illustrates a typical form of an A-type indicator as developedfor the SH Naval and Mark 16 mobile fire-control radar equipments. Thisunit includes provision for receiver tuning and video limiting adjustmentconvenient to the observer. The SH and Mark 16 radar systems employ. Fig. 45.—Mechanical design of AN/APQ-5 type B radar indicator. both lobing of the antenna for precise azimuth bearing determination andalso continuous rotation of the antenna for general search purposes. Theindicator shown in Fig. 46 is employed when the lobing system is in opera-tion and features a precision range sweep as well as the full range ecjuipment design here reflects the severe mechanical requirementswhich must be satisfied for electronic equipment which is to be employed onnaval vessels or for trailer mobile ground service. The Radar Siveep Function The sweep circuit components of a radar receiver are required to generatethe specific voltage or current wave forms necessary to properly display theradar-received information in the desired form. These wave forms mustalso be actuated by or related to the various coordinate or computed typesof data furnished to the radar receiver. The actual detailed configurationof t
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
