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Radar System Engineering

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SEC. 17.16] RELAY SYSTEM FOR AIRBORNE RADAR 733<br />

vibrator of Fig. 17.22. The square waves from the latter control a<br />

switch that alternates between radar and beacon video signals, if the<br />

latter areto be relayed. Apulseformed onthose cycles inwhich radaris<br />

)+–,<br />

I<br />

I<br />

l——————— —————— —______ __<br />

J<br />

4oo- Scale of 2 I<br />

Pulse<br />

multo<br />

I<br />

oscillator<br />

former<br />

vibrator<br />

I<br />

u<br />

1<br />

I<br />

Ir<br />

1f<br />

~<br />

Switch 1 Filter<br />

1 _ Beacon<br />

I<br />

I<br />

I<br />

i)<br />

Compass<br />

LJ<br />

Phaae<br />

1-<br />

sensitive<br />

+ rectifier<br />

L___–____WhWKi<br />

.—— ————————————<br />

I<br />

1<br />

I , Trigger<br />

I<br />

I<br />

(every cyck)<br />

1<br />

I<br />

30P sec<br />

I<br />

delay<br />

I<br />

I<br />

i<br />

I<br />

1i<br />

I<br />

Modulator pulse I Trigger<br />

1 Cosine<br />

I (radar cycke)<br />

I pulse<br />

I<br />

I<br />

I <strong>Radar</strong> video<br />

Circuit of Video<br />

Receiver —<br />

Switch I<br />

Fig. 17.14<br />

4 I Beacon video<br />

I<br />

I Angle data<br />

l--<br />

*<br />

9<br />

L ___ _An!yz~ ?Qd:c~ !E!n!!~r _ – _ ~<br />

FIG. 17.22.—Am-to-surface relay system.<br />

transmitted is passed to the coder to serve as an identifying pulse in the<br />

relay channel. When the beacon signals are not desired, the relay of<br />

Fig. 17.14 is reversed and the original pulses go to the coder on evezy<br />

cycle.

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