摘要:
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.
摘要:
Emergency information communicating device is disclosed having a wireless transmission circuit, a switch means and a battery which are provided in a waterproof case body, a permanent magnet inserted in a slot defined in the case body for providing a magnetic field to actuate the switch means and an electrical conducting member acting as an antenna. By disengaging the permanent magnet from the case body, emergency information can be radiated from the antenna.
摘要:
An easily assembled battery contact arrangement for a radio is formed of mating parts which can be assembled without tools and fitted into a mating receptacle in the radio. This arrangement includes an opening which accepts the terminal of a chargeable battery, and provides electrical connection to an external projection which permits the battery to be charged while the battery is in the radio.
摘要:
A capacitive signal dependent upon a quantity being measured is produced by capacitive sensors of a radiosonde. An oscillator in the radiosonde has an output frequency, controlled by the capacitive signal, in the order of 1 to 10 MHz. The output frequency of the oscillator is divided by a factor of 2.sup.7. A high frequency transmitter in the radiosonde is frequency modulated by a frequencyf.sub.M1 =f.sub.M0 /dwherein f.sub.M1 is the output frequency of the divider and f.sub.M0 is the input frequency of the divider.
摘要:
A signal for indicating the location of one or more people in distress comprising a rectangular tank containing helium, an inflatable balloon enclosed by a casing of aluminum foil and tubular connections between the tank and the balloon and which include valves. A radio transmitter is connected to the balloon by a short cable and a nylon cord which functions as a tether is connected to the transmitter. The other end of this tether is taken up on a reel. A trigger on the transmitter is tripped when the tether is payed out a predetermined distance to activate the transmitter. The balloon, the transmitter, and the reel are all mounted on the top of the tank together with a first aid survival kit and a cover which is hinged at one end to the tank encloses these elements. A clip is provided for securing the entire unit to the person of a user.
摘要:
In a buoyant smoke marker for marine use, the provision of a radio transmitter. The marker can be located from much greater distances than can conventional smoke markers.
摘要:
A structure for supporting a portable electric device and for making electrical connections thereto for energizing the device and connecting the same to external apparatus. The structure shown is particularly adapted to support a portable radio for use in a vehicle, and for automatically connecting the radio to an electric current supply and/or an antenna, and/or to other external apparatus. The structure can also be used to lock the radio into the frame, protecting it against unauthorized removal. The supporting structure includes a housing for receiving the electric device, which is slidably mounted in a frame, with movement of the housing causing movement of connectors thereon into operative engagement with electrical connectors on the device. The frame may include a cam engaged by the actuator of a connector, to move the connector as the housing slides within the frame. The structure for supporting a portable radio may include first and second connectors moving in sequence as the housing with the radio therein slides within the frame, with the first connector making electrical connections to the radio and also accurately positioning the radio within the housing, and the second connector then moving to make connection with the radio.
摘要:
A portable, hand-held remote control transmitter unit comprises a housing which provides a pair of spaced parallel handgrips. Located forwardly of the handgrips and extending between them is a console having a function switch mounting surface with a Vshaped horizontal profile. The mounting surface comprises a pair of vertically inclined planes which intersect at an apex and diverge outwardly therefrom. An array of thumb actuated function switches is located on the mounting surface, arranged in upper and lower rows. The upper row of switches is offset from the lower row so that each switch is positioned within vertical range of the operator''s thumb. Since the apex of the resultant V-shaped rows faces the operator as he grips the unit with his hands, each function switch is positioned within horizontal range of the operator''s thumb as well. A pair of trigger switches, which effectuate proportional control of the functions initiated by the aforementioned function switches, are mounted on the underside of the handgrips within range of the operator''s forefingers. Either trigger switch may be operated simultaneously with the aforementioned thumb operated function switches, and the operator''s hand need not be moved. A safety disabling switch, located beneath the function switch rows, extends transversely between the handgrip frame members so that it, too, can be activated by either thumb without disturbing the operator''s grip on the unit.
摘要:
A body-coupled portable radio transmitter to be worn camouflaged, at about waist level, in the manner of a shoulder bag, under a covering outer garment, and depending from a resilient flexible open coil for coupling RF output of the transmitter to the body to be radiated by the body, the coil diameter being small enough for the coil to be worn under the garment and there being a sufficient number of turns in the coil to be tunable in place on the wearer, the combination with the transmitter being operable at average output power on the order of 1 watt, which is low enough not to be hazardous to the health of the wearer while having good signal-to-noise ratio, in a frequency band high enough for good radiation efficiency, i.e. above 3MHz, but not so high as to introduce health hazards to the wearer, i.e. below 40MHz, and operable with radiation efficiency greater than that of the same transmitter equipped with a whip antenna operated at the same average power and frequency when positioned next to the same person where the whip antenna does not extend above the head of the wearer so as not to be visible.
摘要:
A radio transmitter and receiver housing is formed of a rectangular frame structure which is open at the front and back sides thereof. Separate front and rear cover means are detachably mounted to the rectangular frame structure to cover the front and rear openings. A printed circuit board carries substantially all of the components of the radio transmitter receiver device and is mounted within the rectangular frame structure. The circuit side of the printed circuit board is substantially level with one of the front and back openings. The rectangular frame structure is formed of a material having poor soldering characteristics and capable of withstanding soldering temperatures so that the components may be mounted on the printed circuit board and the assembly soldered without removal of the printed circuit board from the rectangular frame. The rectangular frame structure also permits the addition of other rectangular frame structures thereto to enlarge the size of the housing.