Radio transmitter for repeated bursts of oscillations

Details Radio transmitter for repeated bursts of oscillations Radio transmitter for repeated bursts of oscillations

1981-01-06

1983-08-30

Safourek, Benedict V.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340359, 340567, 331173, 375 21, H03K 366

Patent

active

044019777

ABSTRACT:
This radio transmitter is for use in an access control system and comprises a hands-free pocket token arranged to transmit bursts of oscillations at a preset carrier frequency with a preset number of carrier frequency cycles in each burst. The transmitter is controlled by a logic circuit driven from a counter of the number of oscillations both in a transmission burst and in the interval between bursts, so that a particularly simple system is provided which can be easily reset in accordance with requirements.

REFERENCES:
patent: 2403873 (1946-07-01), Mumma
patent: 3756014 (1973-09-01), Zatsky et al.
patent: 3845473 (1974-10-01), Kawashima
patent: 4053879 (1977-10-01), Anderson
patent: 4162448 (1979-07-01), Gilmour
patent: 4191948 (1980-03-01), Stockdale

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