US PATENT SUBCLASS 342 / 414
.~.~.~.~ Distinctive frequencies equi-signal type

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

350  DF  DIRECTIVE {10}
385  DF  .~ Beacon or receiver {2}
386  DF  .~.~ With transmisson of bearing or position determinative signals {6}
407  DF  .~.~.~ Fixed course or bearing indicating {5}
414.~.~.~.~ Distinctive frequencies equi-signal type {2}
415  DF  .~.~.~.~.~> Coded equi-signal (e.g., A and N type)
416  DF  .~.~.~.~.~> Sequentially effective reflectors

DEFINITION

Classification: 342/414

Distinctive frequencies equi-signal type:

(under subclass 407) Subject matter in which a beacon is caused to radiate along two fixed, angularly disposed, directional patterns with radiations in each pattern being given a modulation which is a distinctive frequency.

(1) Note. The different frequencies when received in equal or proportional strengths, given an indication that the receiver is located on course, while predominance of one frequency over the other indicates the sense of the deviation from course.