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Radar System Engineering

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720 RADAR RELAY [SEC. 17.12<br />

provides a means of measuring the standing-wave ratio on the line. The<br />

bidirectional coupler consists of a short section of line in which is mounted<br />

a directional pickup loop. At orientations 180° apart, the loop picks up<br />

H<br />

Negative video 3.staga video<br />

signals and pulses amplifiar<br />

Raflectometar<br />

I<br />

Cathode<br />

follower with<br />

d.c rastorer<br />

Pulse<br />

transformer<br />

—<br />

I<br />

I<br />

Modulation<br />

diode<br />

&<br />

Master<br />

oscillator<br />

-v<br />

I<br />

Synchronization 4.stsge video High voltaga<br />

pulsas amplifier transformer<br />

I<br />

a<br />

(a) Transmitter<br />

‘ Video<br />

;<br />

Video<br />

“-<br />

Video signal<br />

Tuned cavity Detector cathoda<br />

amplifier<br />

follower output<br />

3 stages<br />

R-f<br />

Invarse<br />

of if<br />

Amplifier<br />

amplifiers<br />

amplifiers<br />

faedback<br />

I \<br />

I<br />

I<br />

3 :::?<br />

Cathoda<br />

Converter<br />

amplifiers<br />

follower<br />

1 I t<br />

R.f<br />

oscillator<br />

Estsrnal radar<br />

interference<br />

suppression<br />

Cathode<br />

followar<br />

I<br />

(b) Receiver<br />

AGC IoOp<br />

FIQ. 17.17 .—3OO-Mc/sec amplitude-modulated equipment.<br />

the outgoing power and the reflected power respectively. The filter<br />

section is installed to prevent radiation of harmonics and other spurious<br />

c.ff-frequency signals. It has been designed to have 50 ohms impedance,

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