US PATENT SUBCLASS 342 / 421
.~.~.~.~ Pulse-type noise elimination or compensation (e.g., sky waves)

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}
417  DF  .~.~ Direction-finding receiver only {14}
420  DF  .~.~.~ With error or deviatioan compensator or eliminator {1}
421.~.~.~.~ Pulse-type noise elimination or compensation (e.g., sky waves)

DEFINITION

Classification: 342/421

Pulse-type noise elimination or compensation (e.g., sky waves):

(under subclass 420) Subject matter wherein the signal is in the form of pulses.

(1) Note. The systems in this subclass are usually provided with means to eliminate or compensate for unwanted signal pulses, such as reflected sky waves.