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Radar System Engineering

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SISC.17.7] GENERAL METHODS OF RELAYING SINE AND COSINE 703<br />

\<br />

b 0?<br />

<strong>Radar</strong> video signals<br />

and trigger pulse<br />

o<br />

f2<br />

o<br />

~llj,;,w<br />

1 To transmitter<br />

-L =<br />

Transformer<br />

i<br />

Audio<br />

filter/1<br />

C+D sine<br />

From<br />

C >Ll<br />

receiver Video filter Audio C!+D COS@<br />

3 Mc\sec filterjz<br />

1+ v<br />

Audio<br />

filter f~<br />

wEzil Y 1<br />

I<br />

b<br />

AVC<br />

e<br />

video and trigger<br />

o !%.<br />

o rr 2r7<br />

B<br />

Signal at a<br />

Potential at b<br />

FIG. 17.11.—Method of relaying sine and cosine by c-w on one r-f carrier.<br />

At least two methods of supplying slowly varying sine and cosine<br />

voltages have been successfully applied. One is a c-w method; the other<br />

involves pulse timing.<br />

A C-w Method.—In order to allow transmission of all the scanner data<br />

on one r-f subcarrier, each item of information can use a different audio<br />

frequency, the subsequent sorting being done by a-f filters. Figure 17.11

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