Radio signalling systems

Details Radio signalling systems Radio signalling systems

1979-01-08

1981-11-10

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

328136, 340539, 34082563, 34082569, H04L 2700, H04B 1200

Patent

active

043002366

ABSTRACT:
This invention is a radio frequency identity system in which each user has a token containing a low power transmitter. If he wants to enter a security area, a receiver operates to let him enter if it recognizes that the transmission is correct. A correct transmission is one having a set number of R.F. carrier cycles between successive modulation pulses.
In an alarm system a user can identify himself in a similar manner.

REFERENCES:
patent: 3197563 (1965-07-01), Hamsher et al.
patent: 3440353 (1969-04-01), Salmet
patent: 3634824 (1972-01-01), Zinneta
patent: 3902478 (1975-09-01), Konopasek et al.
patent: 4005428 (1977-01-01), Graham
patent: 4047107 (1977-09-01), Dickinson

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