US5493210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined signal level meter and leakage detector
Assignee: Trilithic Inc
•
Filing: 1993-06-10
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Granted: 1996-02-20
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Expires: 2013-06-10
Abstract
Abstract A combined signal level meter and leakage detector having a built-in antenna for the leakage detector, and dual clock frequency control of the microcontroller along with bandwidth switching for greater sensitivity in leakage detection mode. A data logging function is also provided. Control circuitry is also provided for avoiding receiver spurs by combined switching of multiple local oscillator frequencies, including combinations of high-side and low-side injection and IF shifting.
Inventors
- 👤 Dennis L. Orndorff
- 👤 Dennis W. Staley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:31
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/16; H03D7/161; G; G01; G01R; G01R29/00; G01R29/08; G01R29/0864; G01R29/0871; G01R31/00; G01R31/28; G01R31/282; G01R31/2825; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/1027; H04B15/00; H04B15/02; H04B15/04; H04B2001/1054; H04B2215/00; H04B2215/064
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
110 words
A combined signal level meter and leakage detector, comprising: a first RF input; a second RF input; a wideband dual-conversion receiver front end connected to said first RF input; a single-conversion receiver front end connected to said second RF input; an IF stage having an input connected to said dual-conversion receiver front end and an input connected to said single-conversion receiver front end; a detector having an input connected to said IF stage; a processing and control circuit having an input connected to said detector; display means for selectively displaying signal level data and leakage data provided by said dual-conversion receiver front end and said single-conversion receiver front end, respectively.
Claim 2
Dependent Claim
110 words
A combined signal level meter and leakage detector, comprising: a first RF input; a second RF input; a wideband dual-conversion receiver front end connected to said first RF input; a single-conversion receiver front end connected to said second RF input; an IF stage having an input connected to said dual-conversion receiver front end and an input connected to said single-conversion receiver front end; a detector having an input connected to said IF stage; a processing and control circuit having an input connected to said detector; display means for selectively displaying signal level data and leakage data provided by said dual-conversion receiver front end and said single-conversion receiver front end, respectively.
Claim 3
Dependent Claim
68 words
The combined signal level meter and leakage detector of claim 1, wherein said dual-conversion receiver front end includes first and second local oscillators and first and second mixers and said single-conversion receiver front end includes a mixer, and wherein said second local oscillator has a first oscillator output connected to said second mixer and a second oscillator output connected to said mixer in said single-conversion receiver front end.
Claim 4
Dependent Claim
35 words
The combined signal level meter and leakage detector of claim 2, wherein said second local oscillator is operable to generate a local oscillator frequency on the order of 1000 MHz at said first oscillator output.
Claim 5
Dependent Claim
35 words
The combined signal level meter and leakage detector of claim 3, wherein said second local oscillator is operable to generate a local oscillator frequency on the order of 200 MHz at said second oscillator output.
Claim 6
Dependent Claim
23 words
The combined signal level meter and leakage detector of claim 1, further comprising a built-in antenna connected to said single-conversion receiver front end.
Claim 7
Dependent Claim
41 words
The combined signal level meter and leakage detector of claim 1, wherein said processing and control circuit includes a multi-frequency clock circuit having a relatively fast clock frequency for signal level measurement and a relatively slow clock frequency for leakage testing.
Claim 8
Dependent Claim
36 words
The combined signal level meter and leakage detector of claim 1, wherein said detector includes a bandpass filter network having a relatively wide bandwidth for signal level measurement and a relatively narrow bandwidth for leakage testing.
Claim 9
Dependent Claim
41 words
The combined signal level meter and leakage detector of claim 1, further comprising automatic power switch means for automatically periodically supplying power to said receiver front ends, said IF stage, said detector, said processing and control circuit and said display means.
Claim 10
Dependent Claim
35 words
The combined signal level meter and leakage detector of claim 3, wherein said second local oscillator is operable to generate a local oscillator frequency on the order of 200 MHz at said second oscillator output.
Claim 11
Dependent Claim
23 words
The combined signal level meter and leakage detector of claim 2, further comprising a built-in antenna connected to said single-conversion receiver front end.
Claim 12
Dependent Claim
41 words
The combined signal level meter and leakage detector of claim 10, wherein said processing and control circuit includes a multi-frequency clock circuit having a relatively fast clock frequency for signal level measurement and a relatively slow clock frequency for leakage testing.
Claim 13
Dependent Claim
36 words
The combined signal level meter and leakage detector of claim 11, wherein said detector includes a bandpass filter network having a relatively wide bandwidth for signal level measurement and a relatively narrow bandwidth for leakage testing.
Claim 14
Dependent Claim
41 words
The combined signal level meter and leakage detector of claim 5, wherein said processing and control circuit includes a multi-frequency clock circuit having a relatively fast clock frequency for signal level measurement and a relatively slow clock frequency for leakage testing.
Claim 15
Dependent Claim
36 words
The combined signal level meter and leakage detector of claim 13, wherein said detector includes a bandpass filter network having a relatively wide bandwidth for signal level measurement and a relatively narrow bandwidth for leakage testing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |