Condition responsive RF transmitting device

Communications: radio wave antennas – Antennas – Having electric space discharge device

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Details

331 71, 331116FE, 340539, 455129, H01Q 124, G08B 108

Patent

active

044595956

ABSTRACT:
A device mounted on a power transmission device of a vehicle is utilized for transmitting an RF signal when a predetermined parameter exists in the power transmission device wherein the RF signal is capable of being received at a remote location. An electromagnetic transducer provides alternating voltage as power which is applied to an oscillator including a crystal filter, a junction field effect transistor and a resistor. The alternating voltage is applied across a drain and a source of the junction field effect transistor. The crystal filter is connected between the drain and the gate of the junction field effect transistor while the resistor is connected between the gate and the source of the junction field effect transistor. A wire antenna has a first end which is connected to the drain of the junction field effect transistor and a second end which is connected to the source of the junction field effect transistor to prevent transmission of any RF signal until the predetermined parameter is exceeded. Sensing elements mounted on the power transmission device indicate when any one of several parameters is exceeded and cause the second end of the wire antenna to be disconnected from the source of the junction field effect transistor to allow transmission of the RF signal.

REFERENCES:
patent: 3230455 (1966-01-01), Kosta

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