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7103342 |
System and method for reducing the effects of clock harmonic frequencies
A system and a method are provided for reducing the effects of spurious frequencies in a wireless communications device. The system comprises a processor having a reference frequency input and a cl...
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6804529 |
Trunked radio repeater communication system including home channel aliasing and call grouping
A system for channel assignment in a trunked transmission communication system including a plurality of subscribers. A plurality of subscribers is provided home channel assignment to reduce collisi...
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6687487 |
Repeater for transmission system for controlling and determining the status of electrical devices from remote locations
A repeater for use in a two way communication system for retransmitting information between a first device and a second device to help ensure reliable two way communication between the devices, com...
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6529486 |
Trunked radio repeater communication system
A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interco...
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6374115 |
Method and apparatus for trunked radio repeater communications with backwards compatibility
A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interco...
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6185418 |
Adaptive digital radio communication system
The present invention involves an adaptive digital radio communications architecture which can be reconfigured by reprogramming at least one programmable device, and thus more efficiently use the a...
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6035184 |
Signal processing circuit
A signal processing circuit for use in a mobile radio equipment terminal including a receiver is provided with an oscillator for oscillating a clock signal serving as a reference; a harmonic-compon...
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5815799 |
Priority system for a wide area transmission trunked communication system
A method and apparatus for providing priority access for users in a transmission trunked communication system, including a plurality of distributive radio network terminal (RNT) switches and a uniq...
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5805871 |
System and method for phase-synchronous, flexible-frequency clocking and messaging
A master time-base unit generates quadrature-phase sinusoidal system reference signals that are phase-locked to a frequency reference oscillator. Based upon messaging signals received from an exter...
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5794131 |
Reducing or eliminating radio transmitter mixer spurious outputs
In radio transmitting equipment that develops a carrier frequency using a mixer, techniques are used to "shift" or "hide" spurious mixer outputs so that they do not significantly degrade spectral p...
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5778322 |
Method and apparatus for controlling transceiver operations in a radio communications system to reduce same channel frequency interference
Transceiver frequency and power level are allocated in a radio communications system which includes a base station, a radio personal communications terminal, and a radio personal communications net...
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5761259 |
Apparatus, method and article of manufacture for carrier frequency compensation in a FM radio
A method, apparatus and article of manufacture for compensating for carrier frequency error is disclosed. An FM signal is received from an antenna and the received FM signal is provided to receiver...
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5751114 |
Apparatus, method and article of manufacture for carrier frequency compensation in a FM radio transmitter
A method, apparatus and article of manufacture for compensating for carrier frequency error is disclosed. An FM signal is received from an antenna and the received FM signal is provided to receiver...
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5742641 |
Apparatus, method and article of manufacture for the dynamic compensation of FM deviation in a FM radio receiver
Described is a method, apparatus, and article of manufacture to minimize radio data modem receive errors when a base station keys up. It applies to an intermittently keyed, multiple base station, s...
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5734676 |
Apparatus, method and article of manufacture for carrier frequency compensation in a FM radio receiver
A method, apparatus and article of manufacture for compensating for carrier frequency error is disclosed. An FM signal is received from an antenna and the received FM signal is provided to receiver...
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5613196 |
Method and apparatus for a distributive wide area network for a land mobile transmission trunked communication system
A land mobile transmission trunked communication system is provided with a unique switching protocol arrangement among repeaters that are networked to one or more external communication networks. T...
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5608758 |
Radio control device having crystal high frequency module and high frequency phase lockloop for selective use, modules detachably mounted
A radio control device includes a transmitter, in which a crystal type high frequency module equipped with a high frequency circuit corresponding to a frequency band of a carrier and a PLL high fre...
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5590402 |
Multi-mode transmitter for transmitter for signals having varying deviation levels
A dual-mode transmitter (100) adjusts a signal's deviation level when switched between a wideband mode and a narrowband mode of operation. The transmitter (100) automatically attenuates the deviati...
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5548802 |
Method and apparatus for a remote network switch for a land mobile transmission trunked communication system
A method and apparatus for distributively interconnecting a plurality of land mobile trunked transmission communication systems into a wide area network includes a plurality of distributive radio n...
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5465386 |
Signaling protocol for a distributive wide area transmission trunked communication system
A land mobile transmission trunked communication system is provided with an enhanced control signal protocol. The land mobile transmission trunked communication system includes a plurality of trans...
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5335362 |
Method of tuning and compensating the received signal strength indicator in a radio telephone
In the method of tuning the received signal strength indicator the tuning results for selected operating conditions are stored in the microprocessor (10) memory. When the radio telephone (1) is in ...
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5313656 |
Logic controlled tuning signal level and deviation compensation in a radio telephone
Radio telephone tuning information is determined by a measuring computer (20) stored in the memory of the radio telephone (1). A microprocessor (10) receives from the sensors (14) information about...
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5212833 |
Microcomputer controlled synthesizer-type radio receiver
An electronic apparatus includes at least a receiver having a synthesizer section for selecting a receiving frequency and providing an information signal corresponding to the selected receiving fre...
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5142695 |
Cellular radio-telephone receiver employing improved technique for generating an indication of received signal strength
In a digital radio-telephone receiver, an open-loop arrangement for generating a received-signal-strength-indicating ("RSSI") value suitable for use in mobile assisted hand-off within a cellular te...
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