Patent US1690541A successfully refreshed from Google Patents.
US3569869A
Expired / Lapsed
US
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Thermal compensation for a radio frequency transmission line
Assignee: Individual
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Filing: 1968-06-21
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Granted: 1971-03-09
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Expires: 1988-06-21
Abstract
Abstract An electric network is described for compensating a transmission line system for temperature variations. Two types of compensating networks are described, one varying in response to temperature; the other in response to a pilot signal provided for this purpose. A transmission line equalizer is described in conjunction with the thermal compensation network to show the advantages of separating thermal compensation from the equalization network.
Inventors
- 👤 Walter O Sutton Jr
- 👤 Norman Everhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:31
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
104 words
A device for equalizing the transmission of radio frequency signals within predetermined bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network coupled in series with the cable for substantially equalizing at a preselected ambient temperature the cable attenuation of signal frequencies within said bandwidth, and a thermal compensation network coupled in series with the cable and said equalization network, said thermal compensation network having a preselected temperature-sensitive attenuation characteristic which varies as a function of frequency to compensate for thermally caused changes in the cable characteristics for temperatures different from said preselected ambient temperature.
Claim 2
Independent Claim
104 words
A device for equalizing the transmission of radio frequency signals within predetermined bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network coupled in series with the cable for substantially equalizing at a preselected ambient temperature the cable attenuation of signal frequencies within said bandwidth, and a thermal compensation network coupled in series with the cable and said equalization network, said thermal compensation network having a preselected temperature-sensitive attenuation characteristic which varies as a function of frequency to compensate for thermally caused changes in the cable characteristics for temperatures different from said preselected ambient temperature.
Claim 3
Dependent Claim
23 words
The device as recited in claim 1 wherein said thermal compensation network compensates for ambient temperatures above and below said preselected ambient temperature.
Claim 4
Independent Claim
123 words
A device for equalizing the transmission of radio frequency signals within a preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network connected in series with the cable for substantially equalizing at a preselected ambient temperature the cable attenuation of signal frequencies within said bandwidth, and a thermal compensation network connected in series with the cable and said equalization network and presenting a first attenuation at said preselected temperature, said thermal compensation network presenting a decreased attenuation from said first attenuation at the low end of the bandwidth at low ambient temperatures and presenting an increased attenuation relative to said first attenuation at the low end of the bandwidth at high ambient temperatures.
Claim 5
Independent Claim
123 words
A device for equalizing the transmission of radio frequency signals within a preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network connected in series with the cable for substantially equalizing at a preselected ambient temperature the cable attenuation of signal frequencies within said bandwidth, and a thermal compensation network connected in series with the cable and said equalization network and presenting a first attenuation at said preselected temperature, said thermal compensation network presenting a decreased attenuation from said first attenuation at the low end of the bandwidth at low ambient temperatures and presenting an increased attenuation relative to said first attenuation at the low end of the bandwidth at high ambient temperatures.
Claim 6
Independent Claim
105 words
A device for equalizing the transmission of radio frequency signals within a preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network connected in series with the cable for substantially equalizing at a preselected aMbient temperature the cable attenuation of signal frequencies within said bandwidth, and a thermal compensation network connected in series with the cable and said equalization network, said thermal compensation network providing a minimum tilt at said preselected temperature, a negative sloping tilt at temperatures lower than said preselected temperature, and a positive sloping tilt at temperatures greater than said preselected temperature.
Claim 7
Independent Claim
105 words
A device for equalizing the transmission of radio frequency signals within a preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network connected in series with the cable for substantially equalizing at a preselected aMbient temperature the cable attenuation of signal frequencies within said bandwidth, and a thermal compensation network connected in series with the cable and said equalization network, said thermal compensation network providing a minimum tilt at said preselected temperature, a negative sloping tilt at temperatures lower than said preselected temperature, and a positive sloping tilt at temperatures greater than said preselected temperature.
Claim 8
Independent Claim
139 words
A device for equalizing the transmission radio frequency signals within a preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network connected in series with the cable for substantially equalizing at a preselected ambient temperature the cable attenuation of signal frequencies within said bandwidth, a voltage-controlled thermal compensation network connected in series with the cable and said equalization network, means providing a thermal pilot signal having a selected frequency within the bandwidth and for inserting said thermal pilot signal for transmission in the cable, and means responsive to the thermal pilot signal for generating a control voltage indicative of the pilot signal and for applying the control voltage to the voltage-controlled thermal compensation network for varying the attenuation of the network for temperature compensation of said cable transmission system.
Claim 9
Independent Claim
139 words
A device for equalizing the transmission radio frequency signals within a preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising an equalization network connected in series with the cable for substantially equalizing at a preselected ambient temperature the cable attenuation of signal frequencies within said bandwidth, a voltage-controlled thermal compensation network connected in series with the cable and said equalization network, means providing a thermal pilot signal having a selected frequency within the bandwidth and for inserting said thermal pilot signal for transmission in the cable, and means responsive to the thermal pilot signal for generating a control voltage indicative of the pilot signal and for applying the control voltage to the voltage-controlled thermal compensation network for varying the attenuation of the network for temperature compensation of said cable transmission system.
Claim 10
Dependent Claim
21 words
The device as recited in claim 5 wherein said thermal pilot signal frequency is selected near one end of the bandwidth.
Claim 11
Dependent Claim
22 words
The device as recited in claim 6 wherein said thermal pilot signal frequency is selected near the low end of the bandwidth.
Claim 12
Dependent Claim
32 words
The device as recited in claim 6 wherein said thermal pilot signal frequency is located in a region which spans a frequency range up to about 25 percent of the total bandwidth.
Claim 13
Independent Claim
150 words
A device for equalizing the transmission of radio frequency signals within preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising means for providing an automatic gain control pilot signal having a selected frequency within the bandwidth and inserting said AGC pilot for transmission in the cable, means responsive to the AGC pilot signal for automatically controlling the gain of the cable transmission system, means for providing a thermal pilot signal for transmission in the cable and having a frequency selected within the bandwidth substantially remote from the frequency of the AGC pilot, a voltage-controlled thermal compensation network connected in series with the cable, and means responsive to the thermal pilot signal for generating a control voltage indicative thereof and applying the control voltage to the voltage-controlled thermal compensation network for varying the attenuation of the network for temperature compensation of said cable.
Claim 14
Independent Claim
150 words
A device for equalizing the transmission of radio frequency signals within preselected bandwidth over a cable exhibiting variable transmission characteristics as a function of temperature and frequency, comprising means for providing an automatic gain control pilot signal having a selected frequency within the bandwidth and inserting said AGC pilot for transmission in the cable, means responsive to the AGC pilot signal for automatically controlling the gain of the cable transmission system, means for providing a thermal pilot signal for transmission in the cable and having a frequency selected within the bandwidth substantially remote from the frequency of the AGC pilot, a voltage-controlled thermal compensation network connected in series with the cable, and means responsive to the thermal pilot signal for generating a control voltage indicative thereof and applying the control voltage to the voltage-controlled thermal compensation network for varying the attenuation of the network for temperature compensation of said cable.
Claim 15
Dependent Claim
36 words
The device as recited in claim 9 wherein said AGC pilot signal frequency is selected near one end of the bandwidth and the thermal pilot signal frequency is selected near the other end of the bandwidth.
Claim 16
Dependent Claim
35 words
The device as recited in claim 10 wherein said AGC pilot frequency is selected near the high end of the bandwidth and said thermal pilot frequency is selected near the low end of the bandwidth.
Claim 17
Dependent Claim
21 words
The device as recited in claim 9 wherein said thermal pilot frequency is selected near the low end of the bandwidth.
Claim 18
Dependent Claim
30 words
The device as recited in claim 10 wherein the frequencies of said pilot signals are separated from one another by about 50 percent of the frequency range of the bandwidth.
Claim 19
Dependent Claim
65 words
The device as recited in claim 10 wherein the thermal pilot frequency is located in an end of the bandwidth region which spans a frequency range up to about 25 percent of the total bandwidth and wherein the AGC pilot frequency is located in the other end of the bandwidth region which spans a frequency range up to about 35 percent of the toTal bandwidth.
Claim 20
Dependent Claim
97 words
The device as recited in claim 10 wherein said thermal compensation network further comprises: a bridge T network coupled in series with the cable and having input and output impedances matched to the characteristic impedance of the cable, said bridge T network further having; a first voltage-controlled variable resistance device coupled across the upper part of the T network; a second voltage-controlled variable resistance device coupled in the upright portion of the T network; and means providing a DC voltage control path to said first and second voltage-controlled devices for control of the resistance of said devices.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |