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Radar System Engineering

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SEC. 17.16] RELAY SYSTEM FOR AIRBORNE RADAR 735<br />

indicated by Fig. 17”15. This relative freedom from cliffraction effects,<br />

together with the higher antenna gains, gave the 100-Mc/sec equipment<br />

better performance in the absence of severe interference than that of the<br />

300-Mc/sec system. Under the test conditions, satisfactory results<br />

were achieved at ranges up to 100 miles with the airplane flying at<br />

10,000 ft. However, a great deal of interference exists in this frequency<br />

band in busy locations. The tests did not give adequate opportunity<br />

to observe the effect of thk interference in reducing the maximum range<br />

since the sites used were relatively isolated.<br />

The phase-shifted pulse method of synchronization (Sec. 17.6)<br />

gave results comparable to those of the sine-cosine method with either<br />

type of r-f equipment under reasonably interference-free conditions.<br />

Since it is slightly simpler and has fewer adjustments, it was therefore<br />

somewhat superior under the test conditions. No data are available<br />

on its relative performance in the presence of severe interference,

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