US PATENT SUBCLASS 342 / 403
.~.~.~.~.~.~.~ With circular array of antennas

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}
399  DF  .~.~.~ Tacan {2}
400  DF  .~.~.~.~ Receiver only {1}
401  DF  .~.~.~.~.~ VOR {1}
402  DF  .~.~.~.~.~.~ Doppler {1}
403.~.~.~.~.~.~.~ With circular array of antennas

DEFINITION

Classification: 342/403

With circular array of antennas:

(under subclass 402) Subject matter wherein the antennas are arranged in a ring shaped pattern.