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Radar System Engineering

Radar System Engineering

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270 RADAR BEACONS [SEC. 810<br />

range and incidental fixing of pulse repetition rate, the replies to interrogations<br />

from a given interrogator may appear as signals from a false<br />

beacon on the indicator of a second set because the two repetition rates<br />

are almost exactly equal. In two such systems used in the past war, it<br />

was found necessary ho jitter the timing of the interrogation by whole<br />

numbers of periods of the crystal in somewhat random fashion in order to<br />

avoid this effect and the associated difficulty already mentioned—that of<br />

possible “stealing” of the beacon by one interrogator.

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