US3590385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-automatic tuning circuit for an antenna coupler
Assignee: JM Huber Corp
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Filing: 1969-07-25
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Granted: 1971-06-29
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Expires: 1989-07-25
Abstract
Abstract In response to a manual ''''tune'''' order, this system drives the inductance in an antenna matching network to the maximum inductance position, whereupon the drive is reversed and control of the adjustment of the inductor is assumed by the processed output of a mismatch sensing device. The system comprises a first binary device which determines whether or not power will be rendered available to energize the driving circuits for the inductance, together with a second binary device which determines the direction in which the inductance is driven. The system includes a signal processing network which first receives a signal indicative of the desired matched condition, inverts that signal, converts the resultant into a staircase signal, inverts and shapes the staircase signal into one having a smooth slope, and finally, through the use of an operational amplifier, converts the indication of zero-slope attainment into a pronounced negative-going signal or ''''tuned'''' indication which is utilized to control the binary devices in such a way that the toward minimum drive on the inductance is arrested substantially at the point of attainment of the desired match.
Inventors
- 👤 James R Sabo
- 👤 John H Keuper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:59
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/18; H03H; H03H7/00; H03H7/38; H03H7/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
392 words
In a system in which an inductance is tuned to a value appropriate to a sensed matched condition, the combination of: a command switch adapted to be closed to issue an electrical ''''tune'''' command; a sensing device adapted to issue a ''''tuned'''' command; a first binary device having a reset input, coupled to the command switch, and a set input, coupled to said sensing device, means, including a first relay having an output line and controlled by said first binary device, for making power available on said output line when said first binary device is reset and for shutting off power when said first binary device is set, a variable inductance, a two-state bidirectional drive means for said inductance, said drive means having forward and reverse states and being coupled to said output line, said drive means being normally in its reverse state, a second binary device having a first reset input, coupled to the command switch, and a second reset input and a set input, a second relay coupling said second binary device and said bidirectional drive means, said second binary device being reset and said second relay energized for forward drive on the inductance and said second binary device set and said second relay deenergized for reverse drive on the inductance, the issuance of a command causing the first and second binary devices to be reset and power to be available on said output line and said second relay device to be energized and the drive means to change to its forward state and said inductance to be driven towards its maximum value, a first limit switch means coupled to the set input of the second binary device for setting the second binary device when the inductance attains its maximum value, whereby said second relay is deenergized and the drive means returns to its reverse state so that the inductance is then driven towards its minimum value, and a second limit switch means coupled to the second reset input of the second binary device for resetting the second binary device in the event that the inductance attains its minimum value, whereby the inductance is then driven towards maximum value, the issuance of a ''''tuned'''' command by the sensing device causing the first binary device to be set so that power is shut off and the drive on the inductance stops.
Claim 2
Dependent Claim
392 words
In a system in which an inductance is tuned to a value appropriate to a sensed matched condition, the combination of: a command switch adapted to be closed to issue an electrical ''''tune'''' command; a sensing device adapted to issue a ''''tuned'''' command; a first binary device having a reset input, coupled to the command switch, and a set input, coupled to said sensing device, means, including a first relay having an output line and controlled by said first binary device, for making power available on said output line when said first binary device is reset and for shutting off power when said first binary device is set, a variable inductance, a two-state bidirectional drive means for said inductance, said drive means having forward and reverse states and being coupled to said output line, said drive means being normally in its reverse state, a second binary device having a first reset input, coupled to the command switch, and a second reset input and a set input, a second relay coupling said second binary device and said bidirectional drive means, said second binary device being reset and said second relay energized for forward drive on the inductance and said second binary device set and said second relay deenergized for reverse drive on the inductance, the issuance of a command causing the first and second binary devices to be reset and power to be available on said output line and said second relay device to be energized and the drive means to change to its forward state and said inductance to be driven towards its maximum value, a first limit switch means coupled to the set input of the second binary device for setting the second binary device when the inductance attains its maximum value, whereby said second relay is deenergized and the drive means returns to its reverse state so that the inductance is then driven towards its minimum value, and a second limit switch means coupled to the second reset input of the second binary device for resetting the second binary device in the event that the inductance attains its minimum value, whereby the inductance is then driven towards maximum value, the issuance of a ''''tuned'''' command by the sensing device causing the first binary device to be set so that power is shut off and the drive on the inductance stops.
Claim 3
Dependent Claim
76 words
The combination in accordance with claim 1 in which the sensing device is adapted to receive a signal having a zero crossing characteristic, upon the attainment of the matched condition and in which the sensing device comprises: means for inverting and transforming this signal into an amplified signal having a more pronounced zero crossing characteristic and means including an operational amplifier for transforming the more pronounced signal into a triggered signal having a very sharp characteristic.
Claim 4
Dependent Claim
47 words
The combination in accordance with claim 2 in which the first binary device has an inhibiting input coupled to the first limit switch means so that when the inductance is driven to its maximum value the first binary device is ordered to remain in its reset condition.
References Cited (Backward Citations)
CA544286A
Cited
US2802908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |