Radioelectric signal trains generator and portable transmitter comprising such a generator
First Claim
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1. An electrical pulse train generator comprising:
- supply means for providing direct-current electrical power;
a condensor and first resistance serially connected together at a first point and connected across said supply means;
a transistor having a base, emitter and collector;
a second resistance connecting the base of said transistor to said first point;
said emitter of said transistor being connected to said supply means;
a quartz crystal connected between said collector and base of said transistor, said crystal oscillating at a third harmonic frequency;
said generator including means turned to the third harmonic frequency of said quartz crystal for producing oscillations at relatively high frequencies in the megahertz range;
means for periodically driving said transistor from a blocking state into saturation by charging and discharging said condensor to periodically pass said oscillations; and
antenna means for emitting said oscillations.
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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.
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Citations
8 Claims
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1. An electrical pulse train generator comprising:
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supply means for providing direct-current electrical power; a condensor and first resistance serially connected together at a first point and connected across said supply means; a transistor having a base, emitter and collector; a second resistance connecting the base of said transistor to said first point; said emitter of said transistor being connected to said supply means; a quartz crystal connected between said collector and base of said transistor, said crystal oscillating at a third harmonic frequency; said generator including means turned to the third harmonic frequency of said quartz crystal for producing oscillations at relatively high frequencies in the megahertz range;
means for periodically driving said transistor from a blocking state into saturation by charging and discharging said condensor to periodically pass said oscillations; andantenna means for emitting said oscillations. - View Dependent Claims (2)
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3. A portable electronic signal transmitter comprising:
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a housing; an antenna; a signal generator supported in said housing including; supply means for providing direct-current electrical power, a condensor and first resistance serially connected together at a first point and connected across said supply means, a transistor having a base, emitter and collector, a second resistance connecting the base of said transistor to said first point, said emitter of said transistor being connected to said supply means, a quartz crystal connected between said collector and base of said transistor and inducing oscillations, means for periodically driving said transistor from ;
a blocking state into saturation by charging discharging said condensor to periodically pass oscillations to said antenna,said antenna comprising a chain for supporting said transmitter about a users neck, said chain passing freely in a metallic ring connected to said generator. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification