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Radar System Engineering

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660 MOVING-TARGET INDICATION [SEC. 16.15<br />

The oscillator tube is mounted, with its axis vertical, in a blackemd<br />

mu-metal shield visible to the left. A single pickup loop is connected to<br />

two lines via a decoupling fitting. A tunable echo box (Johnson Service<br />

Company Model TS-270/UP) is coupled to the oscillator by a rotatable<br />

““***** ● 9-W*,<br />

****9,*** ●*1<br />

** ***.*.4 9*<br />

loop, the lever arm of which is visible close to the oscillator. An echobox<br />

crystal-current meter is of value in making tuning adjustments.<br />

The remote power supply uses conventional electronic regulation. A<br />

simple RC-filter at the oscillator isolates the reflector electrode. Heater<br />

power is furnished by a dry-disk rectifier and high-current filter.<br />

The optimum value of echo-box coupling varies for different fre-

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