. The Bell System technical journal . (a). 10 10^ IC^ 10-^ 10^ 10-^FREQUENCY IN CYCLES PER SECOND Fig. 33.—Radar video amplifier gain vs. frequency relationships. amj)lilier design previously reviewed. In the video amplifier design thevacuum tube band merit Z?,, again determines the limiting performance of theamplifier, but since the associated video interstage circuit elements con-tribute considerably to the total circuit parasitic capacitance by reason oftheir large i)hysical size, the effective band merit of a vacuum tube for videopurposes must be considered in terms of the total tube and c
. The Bell System technical journal . (a). 10 10^ IC^ 10-^ 10^ 10-^FREQUENCY IN CYCLES PER SECOND Fig. 33.—Radar video amplifier gain vs. frequency relationships. amj)lilier design previously reviewed. In the video amplifier design thevacuum tube band merit Z?,, again determines the limiting performance of theamplifier, but since the associated video interstage circuit elements con-tribute considerably to the total circuit parasitic capacitance by reason oftheir large i)hysical size, the effective band merit of a vacuum tube for videopurposes must be considered in terms of the total tube and circuit capaci-tances. The additional consideration in vacuum tube choice for radar Nideoamplifiers is one of load capacity, since the output signal voltage requiredfor indicator use may range upward to several hundred volts. In a somewhat analogous manner to the relationships discussed in the THE RADAR RECEIVER 751 design of IF amplifier interstage networks, the video amplifier performance athigh frequencies can be improved by the use o
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