Short range radio information system

Details Short range radio information system Short range radio information system

1988-12-30

1993-03-30

Kuntz, Curtis

Telecommunications

Carrier wave repeater or relay system

With delay or recording

455 99, 455121, 340905, H04B 714

Patent

active

051991080

ABSTRACT:
A radio information system operating at low power transmits in the AM broadcast band. A message to be broadcast is digitized and stored in a random access memory. It is retrieved from the memory, converted to analog form, and used to modulate a carrier signal. The message is continuously repeated, allowing nearby persons with AM radio sets to receive the message. In order to extend the useful range of the information system, an impedance matching circuit with a high-Q inductor is located between the antenna and the output circuitry of the transmitter.

REFERENCES:
patent: 2255055 (1939-03-01), Halstead
patent: 3018373 (1962-01-01), Nygaard
patent: 3660762 (1972-05-01), Smith
patent: 4541119 (1985-09-01), Cooper et al.
patent: 4606073 (1986-08-01), Moore
patent: 4799189 (1989-01-01), Grover

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