US PATENT SUBCLASS 342 / 407
.~.~.~ Fixed course or bearing indicating

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.~.~.~ Fixed course or bearing indicating {5}
408  DF  .~.~.~.~> Moving beam
409  DF  .~.~.~.~> With superimposed images
410  DF  .~.~.~.~> Glide slope transmitter or receiver {2}
413  DF  .~.~.~.~> Localizer transmitter or receiver
414  DF  .~.~.~.~> Distinctive frequencies equi-signal type {2}

DEFINITION

Classification: 342/407

Fixed course of bearing indicating:

(under subclass 386) Subject matter wherein signals transmitted from one or more beacons are so modulated or directed that a characteristic signal or lack of signal is received so long as the receiver is maintained within a fixed bearing line or plane.

(1) Note. Usually a plurality of directional radiators are so arranged that they have overlapping directional patterns, the signal received in the overlap region determining the bearing or course.