Wave transmission lines and networks – Automatically controlled systems – Impedance matching
Patent
1974-11-18
1976-05-25
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
Impedance matching
325172, 325177, 333 32, 334 47, H03H 740, H03H 710, H03J 500
Patent
active
039597466
ABSTRACT:
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 frequency band selecting switch and a plurality of tuning elements certain or which are available to provide the desired output signal. The switch is controlled by a first relay controlled motor and the variable tuning elements are controlled by a second relay controlled motor. First logic circuitry is coupled to the first and second motors to control the tuning of the antenna coupler sequentially through a preposition step, a tuning step and an antenna coupler ready step. An amplitude comparator having a given capture range has its input coupled to the antenna coupler and second logic circuitry is coupled to the amplitude comparator, the first logic circuitry and the second motor. The second means is responsive to a first output signal of the amplitude comparator which is produced when the output of the antenna coupler is in the given capture range to control the second motor to tune the variable tuning elements during the tuning step and the second means is also responsive to a second output signal of the amplitude comparator produced when the output signal of the antenna coupler is outside the given capture range to control the second motor to tune the variable tuning elements during the tuning step until the output signal of the antenna coupler is within the given capture range and thereby will enable the first output signal of the amplitude comparator to control the tuning of the tuning elements during the tuning step.
REFERENCES:
patent: 3390337 (1968-06-01), Beitman, Jr.
patent: 3509500 (1970-04-01), McNair et al.
patent: 3794941 (1974-02-01), Templin
Hill Alfred C.
International Telephone and Telegraph Corporation
Lombardi, Jr. Menotti J.
Nussbaum Marvin
O'Halloran John T.
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