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5410753 Mobile test set for a mobile-radio system  
A mobile test set for testing a mobile-radio system containing system components to be tested and at least one operation and maintenance center. The mobile test set has a first interface for the...
5404572 Radio communication apparatus which can be tested by radio and optical test signals  
A radio communication apparatus (21) is tested by not only a radio test signal but also an optical test signal. Each test signal carries a test digital data signal. The apparatus has a radio...
5371760 Method and apparatus for measuring the impulse response of a radio channel  
A system for measuring a multipath radio channel impulse response by cross-correlating digital samples of a received pseudo-random signal with a digital copy of the transmitted signal. A...
5361305 Automated system and method for automotive audio test  
A vehicle audio system is tested during vehicle assembly by a computer controlled system coupled to a vehicle data bus via a diagnostic connector. Radio settings are controlled via the data bus....
5359595 Skywave adaptable network transceiver apparatus and method using a stable probe and traffic protocol  
In the skywave adaptable communication network, the time required to initiate communications between two transceivers can often be an important factor where the propagation characteristics of...
5345230 Method and apparatus for optical transceiver testing  
A method and apparatus are disclosed for providing a self-test feature for an apparatus utilizing an optical communication link, such as commercial laundry appliances having a data acquisition...
5341399 Digital transmission test signal generating circuit  
Disclosed is a digital transmission test signal generating circuit for generating a digital test signal applied to a digital signal transmission system having a scrambler, a transmission path, a...
5313657 Receiver capable of reliably detecting a failure  
In a receiver comprising a receiver filter (12) with a frequency attenuation band and a pilot oscillator (25) for generating a pilot oscillation signal with a pilot frequency in the frequency...
5301360 Digital option select system  
A communication device (10) comprises a coupler (19) for coupling an external device (30) to the communication device, and controller (16) for controlling the communication device., The controller...
5280629 Technique for measuring channel delay  
A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a remote site (200, 500) via the channel (300, 600). The prime site includes a...
5279042 Signal transmission system for trigger probe  
A radio transmission system for a touch trigger probe for machine tools or coordinate measuring machines. In the transmitter shown in FIG. 1, a 1 kHz oscillator produces a signal which is phase...
5239667 Method of controlling handoff in cellular mobile radio communications system  
When communication is established using a mobile radio terminal, the speed at which the terminal is moving is measured by monitoring the Rayleigh fading of the signal strength. Using this velocity...
5233418 CATV sweep system using a gated receiver  
A non-interference method of determining the frequency characteristics of a cable television (CATV) system adds an RF test pulse to an RF video signal in the vertical interval between equalizer...
5230091 Method and apparatus for tuning and compensating power levels in a radio telephone  
In a method and apparatus according to the invention the tuning information determined by a measuring computer (20) is stored in the memory of the radio telephone (1). When the radio telephone is...
5214505 Automatic RF equalization in passenger aircraft video distribution system  
A passenger aircraft video distribution system distributes modulated RF signals (lines 16,26) provided from a central signal source to be used at each passenger seat (208-1 through 208-15). The RF...
5179723 Mobile telephone device for carrying out an aging operation without interference with a mobile telephone system  
In a mobile telephone device (10) comprising a serial interface (13b) and subjectable to an aging operation with an aging device (20) connected to the serial interface, a central processing unit...
5172232 Method and apparatus for communication channel identification and signal restoration  
A method and apparatus for improved ghost cancellation for use in particular in television receivers. The sequence of coefficients derived from a received GCR signal, is further processed to...
5170486 Apparatus for synthesizing a composite RF signal suitable for use as a test signal in testing adjacent channel rejection of radio receivers  
Apparatus for synthesising a composite signal (53) which has spaced first and second frequency channels of which each has an independently predetermined power, the power of the first channel being...
5155590 System for data channel level control  
Automatic level calibration apparatus for transmitting data from a cable television terminal to the headend of a cable television system comprises programmable transmitter apparatus of the...
5123112 Air-to-ground communication system  
An air-to-ground communications system is described for controlling multiple two way radiotelephone conversations between a large number of aircraft (53) and a network of base stations (51) that...
5109534 Cable communication system with transmission line incorporated in hose  
An improvement is attained in a cable communication system of the type having communication line incorporated in the interior of a water supply hose which comprises, in combination, signal...
5105438 Remotely accessing intelligent network channel terminating equipment device  
This invention is a method of remotely accessing an Intelligent Network Channel Terminating Equipment device to expedite the testing and servicing of telecommunications circuits.Intelligent...
5077783 Method of simplifying the tuning of a radio telephone  
In accordance with the invention a radio telephone (1) is tuned so that the tuning equipment (2) selects the signal (S1, S2) to be tuned via the microprocessor (10) and the multiplexer (13), and...
5054111 HF data communications system with network management  
A method of network management for a radio communications network comprising a plurality of stations each of which includes a transceiver and control means therefor, the transceiver and control...
5052048 Crime deterrent system  
The invention relates to a crime deterrent system in which passive pursuit of a randomly moving subject involved in a crime is monitored by a central control station having input as to the exact...
5047762 Method and apparatus for increasing co-channel utilization in a multi-station data communications network with overlapping coverage  
A digital radio system having improved co-channel utilization is disclosed. A remote terminal receives a station identification from one of the fixed stations having an overlapping radio coverage...
5027427 Monitoring system for radio communication apparatus  
A monitoring system and method for a radio communication apparatus, including a base station and a plurality of portable units, for monitoring a state of each of the portable units. The base...
4977607 Method of generating an RF signal modulated by a message signal and distorted by a predetermined fading profile for testing RF receivers, and apparatus for carrying out the method including a fading simulator  
For generating an RF signal modulated by a message and distorted by a predetermined fading profile for testing RF receivers, a sequence of digital phase and amplitude values which corresponds to...
4977399 Mobile radio paging test system  
In a ratio paging system of the type having digital data modulated onto radio signals transmitted from a radio station to receiving units at remote sites, a test system. The test system includes a...
4910791 Monitoring and control of data communications  
A method for calibrating a remote pilot unit is provided wherein both the pilot receiver and the pilot transmitter are calibrated. A test signal of a known magnitude is applied to the pilot unit...
4780885 Frequency management system  
A high frequency (HF) frequency-management system for automatically selecting optimum HF frequency. A frequency management means controls the operation of a regular HF radio communications...
4652861 Method and apparatus for protecting buried optical fiber cable  
The output of an LF transmitter that operates at a prescribed frequency is coupled to an electrically conductive rodent shield on a buried optical fiber cable. The rodent shield operates as an...
4648123 Remote level measurement system for use in a multi-terminal communications system  
A remote level measurement system for use in a multi-terminal communications system wherein a plurality of remote terminals are connected to a master terminal by a distribution network for...
4637064 Local area network equalization system and method  
A global network equalization system for equalizing all modem receivers and modem transmitters connected to a local area network. A calibration signal is injected over the local area network from...
4625332 Programmable time varying attenuator  
A programmable time varying attenuator has a reprogrammable digital circuit or impressing an analog attenuation signal on a continuous wave noise signal. This signal is fed to the input of a...
4555806 System for the automatic establishment of a shortwave telegraphy signal connection  
A system for the automatic establishment of a shortwave telegraphy signal connection between two transmitter-receiver stations within a frequency range subdivided into several channels. Both...
4516269 Automatic equalization for a simulcast communication system  
A simulcast communication system for permitting the same audio signal to be simultaneously broadcasted from a plurality of base stations located remotely from a dispatch station used to transmit...
4465151 Weighstations and remote control thereof  
A weighstation which includes a weighbeam and is arranged to provide indications of axle loadings of a vehicle as the vehicle passes over it has a transmitting and receiving unit which is adapted...
4454509 Apparatus for addressably controlling remote units  
A load management system which includes a central message generator and a plurality of addressable remote load controllers which selectively connect and disconnect high power deferrable loads to...
4443661 Method of detecting troubles in a receiver for a common control channel of a mobile radio telephone communication system and a system therefor  
A mobile radio system having apparatus for monitoring problems in the access channel receiver of a base station. The output of the access channel receiver of a base station is linked directly, or...
4415770 Malfunction detection system for a mobile radio telephone system  
A malfunction detection system sends a test calling signal to the mobile base station receiver and receives a response signal from the mobile station transmitter. A controller in the malfunction...
4413229 Method and apparatus for remote indication of faults in coaxial cable R-F transmission systems  
A method for locating faults or failures in R-F coaxial cable TV transmission facilities is shown and described. A fault locator signal frequency is inserted into a cable system, and low magnitude...
4404514 Fault detection system as for locating faulty connections in a cable television system  
A fault detection system is provided for detecting and locating faulty connections in a cable TV system. First and second signals are generated at the head end transmitter. The first signal is a...
4401860 Frequency signaling method and apparatus with dynamic compensation for frequency errors  
Frequency encoded signaling method and structure to correct for frequency error introduced in the generation of encoded signals. A sequence of frequency encoded signals are recorded on rotating...
4317214 Apparatus for simulating interference transmissions  
A simulated interference system is provided wherein an interference signal of an interference source is simulated by a narrow band coded control signal that is transmitted from a control...
4317218 Arrangement for remote control of repeater stations  
A control arrangement for a radio communication system in which mobile users communicate with one another and with a central dispatcher via repeaters. In a first embodiment, the repeater station...
4315330 Multiple data rate testing of communication equipment  
The invention finds application in a TDMA communications controller having a plurality of i input/output ports. The input/output ports transfer data from respective, local data users to a transmit...
4309773 Apparatus and method for radio channel selection  
An improved apparatus and method for selecting a carrier frequency channel etween two radios are disclosed wherein one radio transmits a cyclic test signal sequentially on a set of frequencies for...
4275446 Method and apparatus for measurement of attenuation and distortion by a test object  
A method for measurement of transmission characteristics consists of supplying a test pulse to an object under test and measuring the pulse at the output of the object under test with the...
4225969 Method and apparatus for testing a frequency synthesizer in an RF modem  
A multiple frequency RF modem includes a frequency synthesizer for providing local oscillator signals to double balanced mixer circuits in both the transmitter and receiver sections. To test the...