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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 6700537 | Method for calibrating a wideband direction finding system The invention is a method of calibrating the sensor system of a wideband direction finder using a noise source. The sensor system includes at least two wideband tuners, and an analog/digital (A/D) converter connected to each wideband tuner. The calibratio... | 03/02/2004 |
| 5666120 | Detector apparatus Apparatus for detecting the presence of a speed detection system includes a microcontroller, a laser detector circuit coupled to the microcontroller, a radar detector circuit coupled to the microcontroller and a display coupled to the microcontroller, whe... | 09/09/1997 |
| 4860015 | Delay line null command generator test set for sarcalm A null command generator test apparatus capable of operating in either the open or closed loop configuration for testing the Sarcalm system. When operating in an open loop configuration the null command generator test apparatus utilizes the normalized vol... | 08/22/1989 |
| 4818955 | System for generating signals subject to statistically random frequency perturbations This system generates signals which vary randomly in frequency. The system includes a digital pulse generator generating multibit digital numbers varying randomly according to an encoded statistical distribution pattern. A first source of digital signals ... | 04/04/1989 |
| 4742561 | Apparatus for generating signals useful for testing the sensitivity of microwave receiving equipment The present invention is an apparatus for generating a signal for use in testing the purported sensitivity of a microwave receiving equipment having a noise source (105, 106) for generating a noise signal, first (112), second (114), and third (118) stage ... | 05/03/1988 |
| 4644357 | Radar clutter simulator The simulation of clutter echo return signals for a radar system is accomplished using two sets of diode noise sources, a frequency synthesizer for bandwidth control, multiplexing control, two D/A converters and mixers, a 90-degree sower splitter, and a s... | 02/17/1987 |
| 4630053 | Electronically controlled array for simulation of passive target/background signatures at millimeter wavelengths A system for an electronically controlled array for the simulation of passive signatures and noise at millimeter wavelengths. The system can simulate passive background signatures and also superimpose radiation intensity variation to simulate either movin... | 12/16/1986 |
| 4329688 | Signal injection circuit for radar gain and noise tests A circuit injects the signal from a stable localized oscillator past a pin diode switch through a first circulator to a waveguide, a second circuit injects a noise signal from a generating diode through a second circulator to the first circulator to the w... | 05/11/1982 |
| 4328552 | Statistical calibration system A calibration method and apparatus, which may be used for calibration and characterization of nonlinearities in electronic components or systems, functions at all frequencies up to and including ratio frequencies. The system under calibration is driven wi... | 05/04/1982 |
