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Radar System Engineering

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580 PRIME POWER LSUPPLZE8 FOR RADAR [SEC. 14.7<br />

can be designed for an input of 19 or 20 volts if it is to be used with an<br />

actual line voltage of 27.5, and a variable control resistor put in series with<br />

the line. This resistor can be a carbon-pile voltage regulator, with the<br />

carbon pile in series with the line and the operating coil across the line<br />

Carbon.pile<br />

voltage<br />

regulator<br />

Voltage<br />

adjusting<br />

rheostat<br />

J<br />

nng<br />

Regulating<br />

.field<br />

output<br />

+ High-voltage<br />

,.<br />

Oulpla<br />

\<br />

tators<br />

presents<br />

tion from<br />

re windcommuars<br />

In<br />

output<br />

FIG. 14.25.—Schematic diagram of dual-output dynamotor with booster windings and<br />

regulating field.<br />

just ahead of the dynamotor. For an input from 25 to 29 volts at<br />

constant load, the regulation of the output voltage can be held within a<br />

range of 5 to 10 per cent. Regulation becomes poorer with changing load.<br />

Booster Armature Voltage Regulation.-A recent development to<br />

improve dynamotor regulation is the construction in the dynamotor

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