Radioelectric signal trains generator and portable transmitter c

Details Radioelectric signal trains generator and portable transmitter c Radioelectric signal trains generator and portable transmitter c

1982-02-03

1984-02-07

Ng, Jin F.

Telecommunications

Transmitter

Mobile or portable

455128, 343702, 331116R, H04B 1034

Patent

active

044307578

ABSTRACT:
The present invention relates to a radio signals transmitter.
The transmitter according to the invention comprises a pulse train generator including a quartz oscillator, generating a high frequency signal which is provided to a transistor 7 controlled by the charge and the discharge of a condensor 5 acting on the voltage of its base. A train of A.C. frequency pulses is thereby produced.
The generator is protected by a housing which is worn around the neck of the user by means of a chain forming a quarter wavelength antenna.
The present invention is used as a portable distress signals transmitter for isolated persons, such as skiers, mountaineers or other people in difficulty.

REFERENCES:
patent: 1993436 (1935-03-01), Eberhard
patent: 3134074 (1964-05-01), Litke
patent: 3462710 (1969-08-01), Watase
patent: 3806936 (1974-04-01), Koster
patent: 3825833 (1974-07-01), Bogue et al.
patent: 4327444 (1982-04-01), Court
"Improved Break-In Keying For Crystal-Controlled Cathode-Keyed _Transmitters" by Erdman, 10/1965.

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