Remote switching apparatus

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

Patent

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Details

340168B, 343225, H04B 700

Patent

active

040782360

ABSTRACT:
A remote switching apparatus, in which a transmitter is adapted to transmit a predetermined number of bursts of single frequency signal, to designate a particular digit. Preferably the group of bursts is preceded by a prepulse of particular character which effectively enables the receiver, preparing it to count the bursts which follow and thus to operate a switch corresponding to the digit. The receiver is thus immune to ambient noises except during the short time interval during which it is enabled.

REFERENCES:
patent: 2421022 (1947-05-01), Francis
patent: 3004241 (1961-10-01), Konig
patent: 3046526 (1962-07-01), Scantlin
patent: 3080547 (1963-03-01), Cooper
patent: 3758864 (1973-09-01), Kanamaru
patent: 3900880 (1975-08-01), Fleischer

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