Active filter

Details Active filter Active filter

H - Electricity

04

B

325/54

H04B 15/00 (2006.01) H04B 1/04 (2006.01)

Patent

CA 1095593

ACTIVE FILTER Abstract of the Disclosure The high power (10-1000 W) modulated carrier of a noisy transmitter is attenuated and amplitude limited and is used to control a power oscillator which regenerates the carrier and modulations without the loss of power. The power oscillator is slaved in frequency to the amplitude limited and attenuated signal and it follows any phase or frequency modulation present thereon. Noise components appearing on the original carrier fall outside of the information passband of the power oscillator loop and therefore are not reproduced. The noise free output from the power oscillator is then A.M. modulated prior to power amplification and transmission. The oscillator operates at relatively high power (1 watt) and is automatically digitally coarse tuned and analog fine tuned.

281867

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