| Abstract | The PPI (LREW) was developed to provide an all-round looking early warning system on 90 cm. The considerations leading up to the choice of this frequency will be found in PRA-85. It was required to obtain ranges of 150 miles with an azimuthal accuracy of +1°. This meant that as narrow a beam width as possible was required, and as great a gain. To speed of approximately 4 r.p.m., low angle coverage was to be accomplished by mounting the antenna on the top of two hundred foot tower. This latter fact made the problem of wind resistance of great importance. |
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