US3842358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage standing wave ratio detecting and adjusting apparatus
Assignee: Collins Radio Co
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Filing: 1973-06-18
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Granted: 1974-10-15
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Expires: 1993-06-18
Abstract
Abstract Hysteresis type detection apparatus for detecting the voltage standing wave ratio (VSWR) of a transmitting system. When the detection apparatus determines that the VSWR exceeds a predetermined value, it actuates a servo-system which adjusts impedances in a coupling unit between the transmitter and the antenna and continues the adjustment until the VSWR is at a value substantially lower than it was upon initial actuation of the servo-apparatus.
Inventors
- 👤 M Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:22
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
209 words
Hysteresis type ratio detector apparatus comprising, in combination: differential amplifier means including first and second input means and output means; first and second apparatus signal input means for supplying two variable amplitude signals the ratio of which is to be compared; means connecting said first and second apparatus signal input means to the first and second input means of said amplifier means, respectively; apparatus output means for providing an output signal when the ratio of signals supplied by said first and second apparatus input signals exceeds a first given ratio in one direction of voltage change from a reference potential and the output signal continuing until the input signals exceed a second given ratio in a direction of voltage change opposite said one direction; variable impedance means, including control means, for varying in impedance in response to a control signal; means connecting said variable impedance means to said first input means of said amplifier means for altering applied signal levels to said amplifier means to change from one given ratio to the other given ratio when the impedance of said variable impedance means changes; and means connecting said output means of said amplifieR means to said apparatus output means and to said control means of said variable impedance means.
Claim 2
Dependent Claim
209 words
Hysteresis type ratio detector apparatus comprising, in combination: differential amplifier means including first and second input means and output means; first and second apparatus signal input means for supplying two variable amplitude signals the ratio of which is to be compared; means connecting said first and second apparatus signal input means to the first and second input means of said amplifier means, respectively; apparatus output means for providing an output signal when the ratio of signals supplied by said first and second apparatus input signals exceeds a first given ratio in one direction of voltage change from a reference potential and the output signal continuing until the input signals exceed a second given ratio in a direction of voltage change opposite said one direction; variable impedance means, including control means, for varying in impedance in response to a control signal; means connecting said variable impedance means to said first input means of said amplifier means for altering applied signal levels to said amplifier means to change from one given ratio to the other given ratio when the impedance of said variable impedance means changes; and means connecting said output means of said amplifieR means to said apparatus output means and to said control means of said variable impedance means.
Claim 3
Dependent Claim
42 words
Apparatus as claimed in claim 1 wherein: said variable impedance means includes a field effect transistor in series with a resistor and is turned OFF when the ratio is exceeded in said one direction; and said variable impedance means is voltage sensitive.
Claim 4
Dependent Claim
147 words
Apparatus as claimed in claim 1 comprising in addition: reference potential means; field effect transistor means and first resistance means comprising a part of said variable impedance means and connected between said first input means of said differential amplifier means and said reference potential means, said field effect transistor means including gate means; diode means and second resistance means connected in series between said control means of said variable impedance means and said gate means of said field effect transistor; first Zener diode means connected between said apparatus output means and said reference potential means for limiting the absolute amplitude of signals appearing at said apparatus output means; and second Zener diode means connected between said first input means of said differential amplifier means and said reference potential means for limiting the absolute amplitude of signals applied to said first input means of said differential amplifier means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |