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4351060 |
Automatic, digitally synthesized matching line terminating impedance
A circuit for automatically digitally synthesizing an output impedance, which may be a matching line terminating impedance, is provided. The means for establishing the desired output impedance...
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4328573 |
Precision phonocartridge interface
A phonograph cartridge interface which enables any magnetic phonograph cartridge to be operated into its proper termination impedance. One embodiment of the device includes a capacitance test...
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4311972 |
High speed antenna coupler
An antenna coupler samples the power transferred between the transmitter and the load, and at two equal distance points from the load. The coupler, based upon the value of the samples, connects a...
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4291284 |
Antenna coupler
A high power, high frequency radio transmitter is connected to an antenna through an adjustable impedance coupling device which comprises a helical coil having a number of straight-sided triangular...
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4233561 |
Automatic impedance matching conduit locator
A battery powerable electrical signaling apparatus for assisting in locating a concealed electrically conductive element, such as an underground pipe. Provided in the apparatus is circuitry which...
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4209758 |
Method and apparatus for the automatic matching of a transmitter to an antenna
A method and apparatus for the automatic matching of a transmitter to an antenna is disclosed. A voltage signal proportional to the square root of the load impedance of the final stage of the...
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4201960 |
Method for automatically matching a radio frequency transmitter to an antenna
A plurality of series inductors and shunt capacitors are provided between a radio transmitter and an antenna. The inductors and capacitors are arranged in binary increments and are inserted in, or...
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4160960 |
Power-dividing and modulating arrangement
A power divider and modulator is disclosed comprising a HF signal source which supplies a carrier signal to a pair of 1/4λ transformers each terminated with a variable impedance, whose impedance...
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4112395 |
Method of and apparatus for matching a load circuit to a drive circuit
A high Q load circuit is automatically matched to a drive circuit with an L network having a series reactance and a shunt reactance, one of which is on a load circuit side of the network and the...
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4108404 |
Arrangement for protecting data communication in a continuous automatic train control system
A system for protecting data communication against disturbances caused by unsymmetrical standing waves along track conductors wherein automatically controlled terminating resistors are utilized to...
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4028645 |
Automatic impedance matching using resistive and reactive diodes
An impedance matching device is disclosed which automatically maintains h isolation between two opposite ports of a four port hybrid while the impedance of one of the other ports varies randomly....
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4015223 |
HF Antenna matching device
An antenna matching device comprises a directional coupler and, respectively connected, in a prior art manner, to two conjugate ports of the directional coupler, one of which is a high-power port,...
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3995237 |
Automatic matching method and apparatus
A high-Q load circuit is matched to a drive circuit with an L-type filter network including series and shunt reactances which are both either inductive or capacitive. While a first of the...
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3959746 |
Automatic antenna coupler tuning control circuit
A control circuit is disclosed to automatically tune an antenna coupler to provide an output signal having a selected one of different operating frequencies. The antenna coupler includes a...
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3919643 |
Phase sensor circuit
A phase sensor circuit for detecting the phase of antenna impedance during signal transmission over a broad frequency band and providing a digital output for indicating a capacitive or inductive...
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3919644 |
Automatic antenna coupler utilizing system for measuring the real part of the complex impedance or admittance presented by an antenna or other network
An automatic antenna coupler is described which includes a matching network having adjustable reactive elements. Control for these elements is provided by a system for detecting the real part of...
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3906411 |
Antenna tuning apparatus
This invention relates to an antenna tuning apparatus wherein the impedance of the antenna can be matched or "tuned-up" without emitting radiation at a detectable level. More particularly, the...
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3906405 |
Tunable antenna coupling circuit
Tunable antenna coupling circuit for applying signals of different frequencies between an antenna and a transmitter-receiver, including a series circuit having a plurality of inductance sections...
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3891947 |
Circuit arrangement for adapting a load network to a transceiver
As a result of using a resistance discriminator and a conductance discriminator and by the choice of the circuit arrangement of two adjustable reactive elements adjustment is obtained in two...
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3828281 |
IMPEDANCE SIMULATING CIRCUIT FOR TRANSMISSION LINES
A circuit for simulating the presence of positive or negative impedances in shunt or in series with a transmission line. A voltage generating circuit generates an impedance simulating voltage and...
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3794941 |
AUTOMATIC ANTENNA IMPEDANCE TUNER INCLUDING DIGITAL CONTROL CIRCUITS
An automatic antenna tuner includes digital control circuits for selecting reactive tuning elements of an antenna impedance matching network. The tuner arrangement provides for rapid transforming...
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3778731 |
TUNING METHOD FOR T-NETWORK COUPLERS
Disclosed herein is a method for tuning a T-network coupler and matching an antenna to a transmitter output. With both input and output inductances of the coupler at values such that the impedance...
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3743974 |
ANTENNA MATCHING NETWORK UTILIZING AN ADJUSTABLE HIGH-POWER INDUCTOR
An adjustable high-power inductor comprising a toroidal inductance coil having a stationary two-section ferromagnetic core whose confronting ends form a pair of predetermined air-gaps therein. The...
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3742394 |
TUNING MEANS IN A MICROWAVE HEATING APPARATUS
Tuning means in a microwave heating apparatus comprises a slotted waveguide section connecting a microwave energy source to a microwave heating means, a tuning probe extending into the slotted...
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3617953 |
MICROWAVE IMPEDANCE MATCHING SYSTEM
An impedance matching device for automatically and continuously matching a time varying microwave load to a fixed frequency microwave power source and its output line.
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3601717 |
SYSTEM FOR AUTOMATICALLY MATCHING A RADIO FREQUENCY POWER OUTPUT CIRCUIT TO A LOAD
An automatic antenna coupler is described which uses a variable inductor and a pair of variable capacitors which are alternately switched into the network; the first while tuning the inductor, and...
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3581244 |
AUTOMATIC IMPEDANCE MATCHING CIRCUITS FOR VARIABLE FREQUENCY SOURCE
An electronically controlled impedance transformer is disclosed in which a tapped inductor is used as the impedance matching coupling means between the source and the load, and in which the...
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3544922 |
IMPEDANCE MATCHING COUPLER SYSTEM FOR A VARIABLE RESISTIVE LOAD IMPEDANCE
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3509500 |
AUTOMATIC DIGITAL TUNING APPARATUS
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3496493 |
TERNARY LOGIC SYSTEM ADAPTED FOR ANTENNA TUNING
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3475703 |
COARSE STEP-FINE TUNE AUTOMATICALLY TUNABLE ANTENNA
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3443231 |
IMPEDANCE MATCHING SYSTEM
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3390337 |
Band changing and automatic tuning apparatus for transmitter tau-pad output filter
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3381222 |
Radio telephone with automatically tuned loaded antenna
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3355667 |
Automatically tuned coupled resonant circuits
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3281721 |
Impedance matching system
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3265994 |
Radio frequency coupling transmission line circuitry
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3160833 |
Automatic coupling network for matching the impedance of an antenna to a plurality of lines operating at different frequencies
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3117279 |
Automatically controlled antenna tuning and loading system
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3002160 |
Phase modulation system
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2981902 |
Automatic impedance matching device
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2921273 |
Automatic antenna coupler
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2910655 |
Automatic antenna coupler
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2897353 |
Non-linear device varying impedance match between antenna and radio frequency stages
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2888555 |
Adaptable input circuit for receiver providing proper tracking with either of two antennas of different impedance
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2886752 |
Servosystem adapted for automatic adjustment of radio transmitters
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2884632 |
Antenna tuning system
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2870334 |
Plural section magnetically variable inductor with frequency tracked systems
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2838658 |
Automatic tuning and loading coupling network for a complex load
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2834887 |
Control systems for matching impedance networks
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