Showing papers on "Feed line published in 1982"

Multiport radio frequency signal combiner

Abstract: A multiport radio frequency (RF) signal combiner is described for combining three or more RF signals for application to an antenna. The combiner includes an input port for each RF signal, an output port coupled to the antenna, and a tuning port coupled to a tuning transmission line. The input ports, output port and tuning port are connected to a terminating element. The tuning transmission line is terminated by a fixed or adjustable short-circuit impedance for substantially eliminating the capacitive discontinuity created by interconnecting the input ports. The RF signal combiner can be advantageously utilized in any radio system where it is necessary to multiplex the RF signals from three or more transmitters to a single antenna.

Optical transmission system for high frequency digital signals

Abstract: A desire exists in the optical transmission of optical signals to co-transmit a service channel or telemetry signals in the form of an additional low frequency signal over the light conductor, since a remote feed line or a service channel is not always installed parallel to the light conductor length. The requirement exists for the transmission of the additional signal that, in addition to a low additional expense, no disruption of the actual useful signal can occur. To this end, the control signal of a laser diode transmitter is modulated with the signal to be additionally transmitted and this light component is coupled out at the receiving side. The structure is particularly useful in optical transmission systems for very high frequency digital signals with bit rates above 100 Mbit/s.

Method and apparatus for switching loop type transmission lines

Abstract: A method of switching transmission lines for a transmission control system in which a plurality of stations are linked with loop type transmission lines having a stand-by transmission line characterized in that each of the stations is operable to switch the active transmission line to the stand-by transmission line in response to the detection of abnormality in the carrier wave and a station transmitting the carrier wave is operable to halt the transmission of the carrier wave on the active transmission line so that the overall transmission line is switched to the stand-by transmission line, thereby minimizing the system down time.

Broadband antennae employing coaxial transmission line sections

Abstract: The deviation in operating frequency which antenna system elements can handle without serious transmission line mismatch is increased by constructing the antenna such that the inner portions (40, 42) of its legs (40,48 and 42,50) are formed of coaxial transmission line connected so that the outer conductor serves as part of the radiator, and so that the inner and outer conductor of the line cooperate to form compensation stubs whose impedance varies with frequency in a manner to cancel or oppose the reactance which the antenna legs exhibit with frequency change. The stubs are connected in series or in parallel with the antenna feed point and parasitic elements. Surge impedance is selected so that the antenna driven elements (nearly resistive) and signal source, and parasitic elements that incorporate the invention, are mismatched at band end frequencies and center band frequency in apparoximately like amount. The impedance is selected such that the antenna (somewhat reactive) and signal source are more nearly matched at frequencies midway between center band frequency and band edge frequencies.

Transmitter and receiver locating device

Abstract: A directional locating device transmits pulsed RF signals at a stabilized frequency and is carried by an object the direction of which is to be determined from a distance remote from the transmitter. A one-half wave delay line in the receiver is responsive to the signal detected by a directional antenna for generating a 180 degree out-of-phase signal with respect to the signal detected by a sense antenna. A variable inductance coupling transformer having a primary winding is connected directly to the sense antenna and the output of the one-half wave delay line to produce at a secondary winding of the transformer a summation signal representing the summation of the 180 degree out-of-phase signal and the signal detected by the sense antenna. A second stabilized RF signal is generated at a different frequency than the RF signals radiated by the transmitting means and input into a mixer detector also responsive to the amplified summation signal to produce an AF signal indicative of the direction of the transmitter means from the receiver when the directional antenna is rotated to any given position relative to the transmitting means. A speaker receives the amplified AF signal to generate audible and non-audible signals, the latter being indicative of the direction of said transmitter means from said receiver.

Apparatus for adjusting the vertical position of the body of a motor vehicle

Abstract: The invention relates to an apparatus for adjusting the vertical position of the body of a motor vehicle, with at least one hydraulic cylinder, the piston of which, which is subjected to pressure, supports at least one bearing spring, the motor vehicle having a hydraulic device with a motor-driven pump and a feed line leading to an open-centre-type control valve and having a return line leading to an unpressurised reservoir. In order to provide simple, comfortable vertical adjustment, the hydraulic cylinder is connected to the feed line via an arbitrarily controllable directional control valve which, in a central position (M), shuts off the hydraulic cylinder, in a high position (H) connects it to the feed line and, in a low position (T), connects it to the return line.

Effects of Power Line Re-Radiation on the Patterns of a Dual-Frequency MF Antennae

Abstract: A detailed computer simulation of AM broadcast reradiation from a power line is described and the computations compared with measurements. The power line is in the vicinity of the London, England two-frequency directional antenna array of the U.K. Independent Broadcasting Authority. A simplified equivalent computational model is derived for the individual power line towers, and the ground effect due to the tower footings is estimated. The computational model includes the overhead ground wire (skywire) but excludes the power carrying wires. Computations are described for the power line induced currents and for the antenna radiation patterns as modified by the power line currents. The comparison of the computed results with full-scale radiation pattern measurements shows sufficient quantitative agreement to support the utility of computational predictions for power-line re-radiation. The frequency sensitivity of the re-radiation is studied theoretically and found to have a noticeable effect for deviations of ±10 kHz.

Method of automatically changing reels of strip material in packaging machines

Abstract: Method of automatically changing reels (17,20) of strip material (15-21) in packaging machines, especially packaging machines (1) for cigarettes, equipped, along a feed line (2), with an ejection device (9) adapted for ejecting from said line (2) those objects (5) to be packaged that are defective and for determining a corresponding arresting of said strip material (15-21), the method providing for the utilization of said ejection device (9), in response to an end of reel signal emitted by a sensor (26,27), for determining the arresting of the associated strip material (15,21) so as to permit the changing of the reels (17,20) with strip (15,21) stopped and the subsequent recommencing of the feed of the strip (15,21) in perfect synchronism with the packaging line (2).

Data line interface

Abstract: A data line interface for coupling an RS-232 line to a coaxial cable line, and for coupling a coaxial cable line to an RS-232 line is disclosed The interface is responsive on the RS-232 side to a request to send (RTS) signal and a data signal (TXD) to couple the data signal to the coax line Data signals received on the coax line provide a data signal (RCD) and carrier detect outputs on the RS-232 side of the interface The interface is capable of asynchronous full duplex communication at 9600 baud or greater, and capable of effectively coupling two RS-232 compatible devices together in a manner which is transparent to the devices

Fluidized bed reactor by microwave heating

Abstract: PURPOSE:To improve heating efficiency and to process quickly a material to be processed in a large amt., by connecting a waveguide to a microwave oscillator and providing a fluidized bed in the waveguide. CONSTITUTION:A waveguide 10 is connected to a microwave oscillator 11, and UO3 powder is put into the waveguide 10 and is stored therein, whereby a fluidized bed 12 of a waveguide type is formed. While a distributor 13 is stored in the lower part of the bed 12, an air feed line 16 which supplies the air to be fed from an air feeder 15 into the bed 12 is connected to the bottom end thereof. The air supplied from the line 16 is diffused by the plate 13 and ascends by passing through the liquid which is to be processed and is introduced into the bed 12. A spray nozzle 17 is stored in the peak part side of the bed 12. The nozzle 17 is connected through a liquid feed line 18 to a liquid feeder 19.

Antenna glass for back window of car

Abstract: PURPOSE:To provide antenna glass having sufficient receiving sensitivity even if the antenna glass is applied for a rift-back or hatch-back type back window to be freely opened/closed and non-directivity for FM broad-casting waves by improving the pattern of antenna lines. CONSTITUTION:A glass plate 11 is provided with many heater lines 14 extended horizontally as a power supply heater 12 for removing blur due to dew condensation generated on the glass surface and bus bars 15 extended virtically in order to supply electric power to the heater line 14 group. As the basic pattern of an antenna conductor 13, a horizontal main antenna line 21 having a power supply point on the side part of the glass plate 11, an auxiliary antenna line 22 fitted close to the upper window frame of the main antenna line 21 with a prescribed distance from the main antenna line 21 so as to be extended in the horizontal direction of the glass plate 11, a phase adjusting antenna line 23 to connect the main antenna line 21 with the auxiliary line 22, and a vertical antenna line 17 are provided.

Inductive gas line for pulsed lasers

Abstract: A gas laser having a metal inlet gas feed line assembly shaped as a coil, to function as an electrical inductance and therefore high impedance to pulses of electric current applied to electrodes at opposite ends of a discharge tube of a laser, for example. This eliminates a discharge path for the laser through the inlet gas feed line. A ferrite core extends through the coil to increase the inductance of the coil and provide better electric isolation. By elimination of any discharge breakdown through the gas supply, efficiency is increased and a significantly longer operating lifetime of the laser is provided.

Signal transmission system for fire alarm junction line

Abstract: A novel signal transmission system, having a junction line comprised of a power source line, a grounding line and a signal line is disclosed. Two complementarily operative transistors are connected in series between the power source line and the grounding line. Signals are sent out from the junction point of the two transistors to the signal line. The speed for transmitting the signals is effectively increased due to the quick charge and discharge of the signal line.

Control and regulating means for an adjustable hydrostatic unit

Abstract: A control and regulating arrangement for an adjustable hydrostatic unit is provided in which the regulating device has an auxiliary control constant pump in the feed line of which there is a restrictor, in which case the pressure retained in front of the latter acts on a pressure chamber in which a regulating piston capable of sliding against the force of a spring and which influences the position of a regulating piston connected with the final control element of the hydrostatic unit and capable of sliding in a regulating cylinder is capable of sliding, characterized in that the unit is a hydrostatic motor and the auxiliary control pump is connected to its output shaft.

Characteristics of a power line used as a VLF antenna

Abstract: The 100-kW transportable very low frequency transmitter system was used at Kafjord, Norway, for transmissions to the SCATHA and GEOS spacecraft. A 22-kV, 10.6-km long transmission line was used as an antenna. Modifications were made in the line to reduce telephone interference. Components were designed and installed to reduce the resonant frequency and increase the antenna current. The final practical operating current was 45 A at 1280 Hz. This resulted in power dissipation of 72 kW and an estimated radiated power of 0.17 to 0.79 W.

Analysis of transmission-line signal distribution to multiple ports

Abstract: The frequency response of a characteristically terminated transmission line, with multiple lumped discontinuities (output port loads) along the line, is determined. The analysis applies steady-state transmission-line solutions and simple circuit analysis methods in an iterative manner to determine the frequency response of each output port. This method is applied to the case of equally spaced capacitive reactance impedances along the transmission-line length. The phase and amplitude distortion resulting from line losses and output loading are determined.

Bar code printing method

Abstract: In the bar code printing method according to the invention, a voltage is selectively applied to a plurality of heating elements (44) which are aligned with respect to one another in the transverse direction of a transport or feed line (39) on which is fed a paper strip to be printed. A bar code (57) is printed onto a surface of the paper strip (43), guided on the feed line (39), by means of the heat radiated from the heating elements (44).

Ground-plane antenna with impedance matching

Abstract: An improved ground-plane antenna with a quarterwave resonant radiating rod (1) made of a hollow tube in which a central earthing rod (7) is arranged to form with the internal cylindrical wall of the radiating rod a line section short-circuited at the upper end, and a further line section (16) open at the lower end is arranged in the extension of the short-circuited line section to form a combined tapped line section therewith having an electrical length substantially equal to the quarterwavelength, in which the combined line section is coupled with its tapping points in parallel to the input terminals of the antenna, whereby the susceptance represented by the combined line section is capable of compensating the changes of the antenna reactance within a fairly wide band.

Device for tilting and locking the driver's cab of lorries

Abstract: The device for tilting and locking the driver's cab of lorries has a hydraulic tilting cylinder 1 in whose one feed line 6 which starts from the pump and is guided via a distributing regulator 9, there is provided, in addition to at least one hydraulically releasable non-return valve, a hydraulic cylinder which moves the locking element 23 with its piston. In the feed line 6 or the return line 15, a shut-off valve 14 is connected which is controlled by means of a control device 41 which is attached to the motor vehicle in such a way that, when the control device 41 is switched on, the shut-off valve 40 blocks the feed line 6 or the return line 15, as a result of which a circulation in the feed line/return line of the tilting cylinder can now no longer take place despite the pump being actuated. This has the advantage that, in order to prevent unauthorised actuation, the pump does not have to be attached to the motor vehicle at constructionally unsuitable points.

Slotted cable antenna structure

Abstract: This invention relates to the structure of slotted cable antennas used in end-fire glide slope systems employed in the instrument landing of airplanes. The structure is an improvement over that described in my U.S. Pat. No. 3,699,582 titled Slotted Cable Glide Slope Antenna. An air-dielectric coaxial transmission line, carrying a travelling wave of radio frequency energy, has a number of probe-fed slots along the outer conductor which leak current onto the outside surface of the line, resulting in radiation. The magnitude of the radiation from each slot is controlled by the probe coupling to the inner conductor and by a slot shunt consisting of a coaxial shorted line section. The relative phase of the radiations from adjacent slots is controlled by the electrical spacing of the slots. The electrical spacing increases with rising temperature due to the expansion coefficient of the transmission line, but this effect is compensated by the inclusion within the transmission line of a strand of polyethylene or similar dielectric having a negative temperature coefficient.

Arrangement for the point transmission of data from a line device to a trackborne vehicle

Abstract: In an arrangement for the point transmission of data from a line device to a trackborne vehicle on lines which can be travelled in both directions, in which arrangement the line device can output data for both directions of travel, both the vehicle and the line device in each case exhibit a section for alerting and/or power transmission and one section for data transmission. The section for alerting and/or power transmission is provided twice, having in each case one antenna in front and behind the data transmission antenna. In the vehicle, all antennas are mounted underneath the vehicle. The antenna for power transmission in the line device receiving first establishes the direction of the vehicle. The correct data are then radiated as a function of this direction.

Television line antenna apparatus

Abstract: Television and FM radio antenna apparatus with a tuneable circuit to be coupled with a building wiring system and thus supplement or replace conventional interior or exterior antennas.

Bias circuit for active HF elements

Abstract: A polarization active microwave components including field effect transistors, comprising a supply circuit for supplying, via a section (4) interposed between the transmission line circuit and a main transmission line (1) and having at its connection point (6) therewith a sufficiently high impedance to prevent the transmission of useful microwave signal passing through the main line (1) to the power circuit while allowing transmission of the direct current delivered by the circuit, a DC bias current to a microwave active element connected in series on the main transmission line. This device comprises a filter, bandpass vis-a-vis the relevant microwave signal and composed of two conductive strips (11) and (12) which are connected in parallel to the main transmission line (1), symmetrically on either side of the connection point (6) of the line section to the main line. These ribbons are located at a distance from this point (6) equal to about a quarter of the wavelength of the microwave signal useful. Application: microwave polarization of all assets including those of television reception systems transmitted by satellites.

Automatic bobbin-changing device

Abstract: The invention relates to an automatic bobbin-changing device on a spinning machine, with pneumatic grippers which can be loaded with compressed air via a common gripping-pin feed line connected to a compressed-air source via a valve. According to the invention, at least one further valve serving for the supply and/or removal of air is arranged on the gripping-pin feed line at a distance from the other valve. An identical actuation of the valves is possible via an electrical or fluidic control line.

Liquid feed system

Abstract: PURPOSE:To prevent the filter of an oil fuel feed system from clogging, by preventing separation of wax and the like from the fuel by keeping the temperature of fuel properly, by utilizing the generated heat from a circulating pump to feed fuel, in a fuel feed system for petroleum for various types of apparatuses such as an engine and a burner. CONSTITUTION:A fuel feedback line 6 is branched off into two lines in the middle part of it, one line 9 is connected to a feed tank 1, provided with a check valve 10, and the other line 8 is connected to a feed line 2, provided with a two way type valve with a thermostat. The connected position of a line 8 to a line 2 is to be nearer to a feed tank 1 than a pump 4 and a filter 3. The valve 7 is to be opened when the temperature of fuel in a line 6 is below the predetermined temperature. With such a structure, the fuel is gradually heated by the heat from a pump 4, and the fuel is stably fed without extreme change in fuel viscosity, as well as a filter 3 is effectively prevented from clogging.

Ground-plane antenna

Abstract: A ground-plane antenna comprises a quaterwave resonant radiating rod (1) made of a hollow tube in which a central earthing rod (7) is arranged to form with the internal cylindrical wall of the radiating rod a line section short-circuited at the upper end. A further line section (16) open at the lower end is arranged in the extension of the short-circuited line section to form a combined tapped line section therewith having an electrical length substantially equal to the quarterwavelength, in which the combined line section is coupled with its tapping points in parallel to the input terminals (4, 5) of the antenna, whereby the susceptance represented by the combined line section is capable of compensating the changes of the antenna reactance within a fairly wide band.

Directional antenna for microwave transmissions

Abstract: P/4006. 04 DIRECTIONAL ANTENNA FOR MICROWAVE TRANSMISSIONS An improved directional antenna for microwave transmissions is disclosed comprising a paraboloidal main reflector, a waveguide feed having a first open end thereof positioned on the axis of the main reflector, and a second waveguide of the same size serially connected between the second open end of the waveguide feed and a transmission device such as a microwave transceiver. The waveguide feed has an elliptical crosssection throughout its axial length, thus providing an elliptically shaped first open end that in of itself and without separate horn attachment, functions as a feed energizer; while the second waveguide also has an elliptical cross-section of the same size, which in combination with such waveguide feed provides a microwave coupling to the transmission device that minimizes reflections, respectively matching problems, especially in the case of overmoded waveguide applications.

Welding current source for arc pulse welding

Abstract: In welding-current sources equipped with a plurality of parallel- connected transistors for regulating the welding current, the respective bases of which are connected in parallel with one another and are controlled by a common control device, and in each of which a resistor serving for balancing is inserted in the emitter circuit, there is the problem of keeping this welding-current source ready for operation even in the event of a collector/base breakdown, so that the welding operation does not have to be interrupted. This is guaranteed by inserting a fuse into the feed line branching off from the supply line to the base of the parallel-connected transistors, the rating of this fuse being such that, when a predetermined nominal current in the particular base feed line is exceeded, it interrupts this.

Microprocessor Based Hardware and Digital Signal Processing Algorithms Provide a State-of-the-Art Approach to Transmission Line/Antenna Systems Analysis

Abstract: Historical methods for characterizing transmission line/antenna systems are discussed. A new approach using the Fast Fourier Transform algorithm with Frequency Domain Refledtometry to Identify the amplitudes and locations of multiple mismatches in a single pass is introduced. Refinement techniques include quadratic interpolation and windowing for increased amplitude and location accuracy, and correlation for rejecting harmonics and high power "foreign" (interference) signals.