. The Bell System technical journal . Fig. 35.—Typical designs of radar receiver video frequency transformers. !+300 VOLTS -. ^WV Fig. 36.—Simplified schematic diagram of video amplifiers as employed in AN/APQ-7airborne radar equipment. Figure 36 illustrates a video amplifier circuit arrangement as develojKxlfor the AN/APQ-7 radar bombing equipment during the latter period ofthe past war. This system employed two GPI type indicators, one ofwhich was located at a remote station of the aircraft and included also an THE RADAR RECEIVER 757 A-type indicator which was employed for certain convenienc
. The Bell System technical journal . Fig. 35.—Typical designs of radar receiver video frequency transformers. !+300 VOLTS -. ^WV Fig. 36.—Simplified schematic diagram of video amplifiers as employed in AN/APQ-7airborne radar equipment. Figure 36 illustrates a video amplifier circuit arrangement as develojKxlfor the AN/APQ-7 radar bombing equipment during the latter period ofthe past war. This system employed two GPI type indicators, one ofwhich was located at a remote station of the aircraft and included also an THE RADAR RECEIVER 757 A-type indicator which was employed for certain conveniences in operationand maintenance of the equipment. This circuit design includes a mainvideo amplifier for the ground plan indication and a separate amplifier forthe A-type display, both of which are of the negative feedback type. Thelimiting amplifier is included as the second stage with negative d-c restora-tion included in this grid circuit and diode d-c restoration at the grid of thelast stage. To provide sutlficient output signal level with the wide videoband width required it was necessary to employ two 6A(j7 tubes
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