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| Number | Title | Issue Date |
| RE43266 | Rotary attenuator and method of making it An attenuator includes a housing defining an interior, a front, a rear, and a rotor mounted between front and rear for rotation within housing about an axis of the rotor. First electrical contacts are provided on the housing. Second electrical contacts are provided ... | 03/27/2012 |
| 7620611 | Neural networks for ingress monitoring A method of identifying a source of ingress into a network includes storing frequency spectra of known sources of ingress, comparing the frequency spectrum of ingress to the frequency spectra of known sources of ingress, and determining from the comparison which of ... | 11/17/2009 |
| 7213257 | Determining phase linearity in CATV distribution systems An apparatus for testing the phase linearity of a network comprises a first local oscillator, a first mixer, and a first filter, a second local oscillator, and a second mixer for mixing the first IF to the desired output frequency. The output of the second mixer is ... | 05/01/2007 |
| 6941226 | Method for determining, recording and sending GPS location data in an underwater environment Underwater position determination is provided by combining sonar-derived ranging data between a sonar receiver and a sonar transmitter with GPS position data to provide geographically-referenced position data accurately representing the position of a sonar receiver ... | 09/06/2005 |
| 6903621 | In-line attenuator An attenuator includes a substrate having first and second surfaces and a plurality of discrete circuit elements. The first surface includes a first electrically conductive pattern providing circuit contacts providing electrical connections among the discrete circui... | 06/07/2005 |
| 6822530 | Rotary attenuator and method of making it An attenuator includes a housing defining an interior, a front, a rear, and a rotor mounted between front and rear for rotation within housing about an axis of the rotor. First electrical contacts are provided on the housing. Second electrical contacts are provided ... | 11/23/2004 |
| 6804826 | Radio frequency leakage detection system for CATV system A communication circuit carries at least one signal including synchronizing intervals by which output of the signal by first apparatus coupled to the communication circuit is to be synchronized. A communication method includes selecting and modulating at least a por... | 10/12/2004 |
| 6687632 | Testing of CATV systems A method and apparatus for determining the location of an impedance mismatch in a digital communication circuit (22) generate (20) at least quasi-random data, transmit the data along the circuit (22) from a transmitting end of the circuit (22), recover (2... | 02/03/2004 |
| 6661308 | One-by-N switch matrix A 1-by-N switch matrix (10) includes at least two ranks of switches (12-1, 12-2-1, 12-2-2, 12-3-1, . . . , 12-3-4, 12-4-1, . . . , 12-4-8, and 12-5-1, . . . , 12-5-16; 112-1, 112-2-1, 112-2-2, 112-3-1, . . . , 112-3-4, 112-4-1, . . . , 112-4-8, and 112-5-... | 12/09/2003 |
| 6292944 | Return path ingress in a two-way CATV system A method and apparatus for locating the source of noise ingress into a CATV system return path by coupling a filter having a passband in the noise frequency bandwidth to the nodes between adjacent return path amplifiers. The filter is sequentially coupled... | 09/18/2001 |
| 6215514 | Ingress monitoring system A system (10) for monitoring the ingress of noise into the return path (14) of a two-way CATV network comprises a detector circuit (16, 116) coupled to the return path (14) to receive a signal from the return path (14). The detector circuit (16, 116) prov... | 04/10/2001 |
| 6020913 | Emergency alert system signal handling method and apparatus A communication system includes a transmission channel, a relay having first and second states, an operating power port, a first signal input port, a second signal input port and a signal output port. A power supply supplies power to the relay to place th... | 02/01/2000 |
| 6018358 | Radio frequency leakage detection system for CATV system A communication circuit comprises sources of program material, carrier frequency signal sources and first modulators for modulating the carrier frequency signal sources with the program material sources. Each of the first modulators has a first input term... | 01/25/2000 |
| 5719792 | Isolator An information system comprises an information network and a station apparatus capable of receiving information from the network and sending a command to the network. An isolator comprises a first diplex filter having an input/output (I/O) port coupled to... | 02/17/1998 |
| 5640697 | Wideband multiple conversion receiver system with means for avoiding receiver spurs by combined switching of multiple local oscillator frequencies A multiple conversion receiver system capable of avoiding receiver spurs by combined switching of multiple local oscillator frequencies, including combinations of high-side and low-side injection and IF shifting.... | 06/17/1997 |
| 5633582 | Combined signal level meter and leakage detector 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... | 05/27/1997 |
| 5608428 | Radio frequency leakage detection system for CATV system A communication circuit comprises a plurality of sources of program material, and a plurality of modulators for supplying a plurality of carrier frequency signals. Each modulator is modulated by a respective one of the sources of program material. Each of... | 03/04/1997 |
| 5493210 | Combined signal level meter and leakage detector 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... | 02/20/1996 |
| 5263185 | AM distortion measurement method and apparatus usable on active audio carriers A test instrument for measuring hum and other AM distortion components on active audio carriers such as in a cable television distribution system. The instrument has an RF tuner capable of tuning to the audio carrier frequency for a selected channel, and ... | 11/16/1993 |
