US PATENT SUBCLASS 342 / 415-- .~.~.~.~.~ Coded equi-signal (e.g., A and N type)

US PATENT SUBCLASS 342 / 415
.~.~.~.~.~ Coded equi-signal (e.g., A and N 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	DF	.~.~.~.~ Distinctive frequencies equi-signal type {2}
415		.~.~.~.~.~ Coded equi-signal (e.g., A and N type)

DEFINITION

Classification: 342/415

Coded equi-signal (e.g., A and N type):

(under subclass 414) Subject matter in which a beacon is caused to alternately radiate in accordance with either one of two fixed angularly disposed directional patterns with the

alternations being so timed that the radiation is each pattern is interrupted in accordance with a code which is distinctive with that pattern.

(1) Note. Classified here are patents on range beacons of the "A and N" type in which one pattern radiates a dot and a dash (A) and the other radiates a dash and a dot (N) which when received in equal strength by a single receiver combine to produce an uninterrupted signal indicative of the fact that the receiver is on course, while predominance of either the "A" or the "N" over the other indicates the sense of the deviation from course.