Abstract: An apparatus for supplying power to a mobile phone by utilizing an external power source when a battery of the mobile phone has been exhausted. In a mobile phone having an earphone-microphone connector which can be connected with an earphone-microphone set, the earphone-microphone connector has additional contacts through which external power can be supplied to the mobile phone from an external power source, especially from another mobile phone. Therefore, even when the battery of the mobile phone has been exhausted, a user can make communication through the mobile phone by utilizing external electric power in a simple and easy manner, without largely changing the existing construction of the mobile phone.

Abstract: A conventional link budget technique has not been fully applicable to a link design of a downlink in CDMA systems, which is now available by using both a power level of a radio channel in question and a total power level, which can be further refined by considering an orthogonality factor and an interference coefficient due to other base stations.

Abstract: An RF generating system operates with high efficiency to supply RF output power to a plasma load. The RF generating system is capable of modulating the RF output power at frequencies up to the frequency of the RF output power while maintaining high efficiency operation. Broadband frequency modulation of the RF output power suppresses instabilities thereby minimizing unstable behavior of the plasma load.

Abstract: A secondary-battery control circuit is provided. The secondary-battery control circuit includes a first path supplying a first load current from one or more secondary batteries connected in series or parallel to a system, and including a first cutoff switch; and a second path supplying a second load current from the one or more secondary batteries to the system, wherein the first cutoff switch is turned off if a voltage of the one or more secondary batteries is lower than a predetermined voltage, or if the first load current is greater than a predetermined current, thereby cutting off the first load current to the system.

Abstract: A cellular telephone receives a first communication signal from a cell-site Station and transmits a second communication signal to the cell-site station. The cellular telephone includes an antenna, a duplexer, receiver, an encoder/decoder apparatus, an acoustic transducer, a transmitter and a controller. The receiver is connected to the antenna through the duplexer. The receiver converts the first communication signal into a voice signal code, and outputs a signal indicating an intensity of the first communication signal. The transmitter is connected to the encoder/decoder apparatus and to the antenna through the duplexer. The receiver converts the input voice code Signal from the encoder/decoder apparatus into the second communication signal. The controller is connected to the receiver and the transmitter. The controller controls amplitude of the transmitter corresponding to said intensity of the first communication signal.

Abstract: A booster amplifier that can be coupled to virtually any cellular telephone handset is provided for use with virtually any cellular communications network. The power output of the booster amplifier is dynamically controlled based upon signals received from the handset to improve the quality and range of communications between the handset and the base stations of the cellular network without interfering with normal communications between the cellular network and other handsets.

Abstract: The invention provides a radio circuit realizing a desired receiving characteristic even when a strong-level interfering wave is received and operating with small power when no interfering wave is received. The radio circuit comprises a receiving circuit for selecting a signal having a desired frequency from received signals and demodulating the signal, an input-power detector for detecting power P1 of the receiving circuit, a received-power detector for detecting power P2 of a signal selected by the receiving circuit, and a reception control circuit for controlling the receiving circuit. The reception control circuit controls the receiving circuit at a low distortion by increasing the power consumption of a circuit included in the receiving circuit and thereby expanding the linear operation range when the power P1 detected by the input-power detector is larger than a predetermined value t1 and the power P2 detected by the input-power detector is smaller than a predetermined value t3.

Abstract: The present invention provides a mobile display system with an improved backlight system. In one embodiment of the invention, the mobile display system comprises a mobile unit including a flat panel display, and a first backlight circuit for providing light to the display. The first backlight circuit includes a plurality of lights sources disposed near edges of the mobile unit and a single power supply for powering a pre-selected one of the light sources. The system also comprises a base station capable of being powered by an external power source. The base station includes a second backlight circuit that comprises at least one power supply for powering the plurality of light sources in the mobile unit when the mobile unit is attached to the base station. This invention keeps the weight and power consumption of the mobile unit low, but allows long battery life at the compromise of display surface light intensity while mobile and provides high brightness characteristics when docked.

Abstract: The present invention provides a battery charger for cell phones which operates off the cigarette lighter receptacle of a vehicle. The battery charger includes a visual indication that is activated by electromagnetic induction from the ringing current that is generated when the cell phone receives an incoming call. An incoming call sensing circuit operates to receive the electromagnetic signal that includes the incoming call signal to the user's cell phone. The electromagnetic signal is filtered and rectified by a conditioning and activation circuit such that only an incoming call signal remains thereafter the incoming call signal is transmitted to a visual indicator circuit having at least one light source for causing the at least one light source to illuminate such that the user is alerted to the incoming call.

Abstract: A mobile device including an auto-connecting module, a manual-connecting module and an earphone with a detecting device is provided. The detecting device generates a status signal in accordance with the status of the earphone. A processor in the mobile device has a determining module, which selectively executes the auto-connecting function or the manual-connecting function according to the status signal. The detecting device includes a switch and a control unit for controlling the switch. When the earphone is in operation, the control unit turns off the switch to make the auto-connecting module active.

Abstract: An interface box links a user's cellular telephone with all the standard telephone extensions at the user's home or office. In this way, the portable cellular telephone is the interface between the user's telephone extensions and the telephone company. The interface box connects to the cellular telephone's access connector, for example, whenever the cellular telephone is laid in a cradle of the interface box. Through this connector is sent all power, signal and input/output connections. In addition to the interface circuitry, the interface box preferably recharges the cellular telephone's battery.

Abstract: A transmitter circuit and method for transmitting a data signal at a desired transmitter power level. The transmitter circuit includes an attenuator for attenuating the data signal by an attenuation factor. An external amplifier receives the attenuated signal and amplifies the signal to an amplified signal voltage. A storage unit containing a set of calibrated power levels associated to a set of amplifier voltages provides a calibrated power level based on the amplified signal voltage. A controller is configured to modify the attenuation factor of the attenuator in response to the difference between the calibrated power level and the desired transmitter power level.

Abstract: A communication system has stations arranged in clusters of member stations, each of which communicates with the other member stations. One member station is a head station of the cluster that communicates with head stations of other clusters. The stations are configured by determining the communication state between a station and one or more cluster head stations. The station is assigned to at least one cluster when a prescribed communication state has been determined between the station and the cluster head station. The station is set to be in independent communication with the one or more cluster head stations which have the prescribed communication state with the station.

Abstract: A radio apparatus (1), in particular for mobile radio, of a first predetermined power stage is proposed, whose broadcasting power can be increased by connecting a HF amplifier circuit. The radio apparatus (1) has an antenna output (5), to which an input (10) of a HF amplifier circuit (15) can be connected, for operating the radio apparatus (1) at a higher, second power stage. As a function of the HF amplifier circuit (15) connected to the radio apparatus (1), a transmitter unit (20) of the radio apparatus (1) outputs signals for transmission to a radio network, which signals contain the information about operation at the applicable power stage.

Abstract: A system and method for notifying a remote device of a low battery capacity condition in a wireless communications system is disclosed. A detector monitors the capacity of the battery in a wireless device receiving operational power from the battery for a low capacity condition. A control system coupled to the detector sends a low battery capacity status signal to the remote device upon detection a low battery capacity condition. While the battery is in a low capacity condition, communications between the wireless device and the remote device may be maintained until the low battery capacity condition is corrected.

Abstract: The invention discloses a separated mobile phone comprises a host-phone and a handset. The host-phone includes a wireless modem module, a main controller, a control signal interface, a digital audio interface, a low-power wireless transceiver module and a PDA device. The handset comprises a main controller, a display, a microphone, a speaker, a keyboard and a low-power wireless transceiver module. The low-power wireless transceiver module in host-phone can be set inside or outside. Communication modules between the host-phone and handset use Bluetooth protocol or Home Radio Frequency protocol. The host-phone and handset can access to public switched telephone network through a home cordless telephone.

Abstract: A booster is provided which controls its gain to reduce the adverse effect of the booster noise on a base station. It receives a perch signal transmitted from a base station; measures received power of the perch signal at the booster; receives information about the transmission power of the perch signal from the base station; and measures the noise power of the amplified uplink signal at the booster. It controls the gain of the uplink signal and/or the gain of the downlink signal in response to the transmission power of the perch signal of the base station, the received power of the perch signal at the booster, and the noise power of the amplified uplink signal at the booster.

Abstract: Aspects of a method and system for increasing availability and proximity of base stations for cellular communications are provided. The aspects include providing a mobile base station as a feature of a motor vehicle. Adaptive capabilities within the mobile base station are utilized for compatibility with a mobile phone. Cellular communications are performed with the mobile phone via the mobile base station.

Abstract: The invention relates to a method and an arrangement implementing the method for adjusting output power of a transmitter power supply, in which method the output power of the power supply is measured and the output power of the power supply is adjusted on the basis of the measured output power. In the method, the output power of the transmitter power supply is adjusted on the basis of the transmission power of the transmitter such that a power supply control unit receives from the transmitter a synchronization chopping that synchronizes the operation between the transmitter and the power supply control unit, and the power supply control unit receives from the transmitter the information on the transmission power of the transmitter.

Abstract: A booster connectable to a handy phone for amplifying the transmission output of the phone is disclosed. A particular transmission message included in a transmission wave output from the phone and determining transmission power is decoded to generate a reference signal matching in level with the transmission power of the message. A variable gain power amplifier has its gain controlled such that the reference signal and the detected signal of the transmission wave output by the booster coincide with each other. As a result, the booster outputs power coincident with the transmission power determined by the particular transmission message. The booster makes it needless to inform the phone of the connection of the booster to the phone, and therefore obviates the need for extra connection lines and circuitry for detecting connection information.

Abstract: A booster amplifier that can be coupled to virtually any cellular telephone handset is provided for use with virtually any cellular communications network. The power output of the booster amplifier is dynamically controlled based upon signals received from the handset to improve the quality and range of communications between the handset and the base stations of the cellular network without interfering with normal communications between the cellular network and other handsets.

Abstract: A portable radio communication device (303) includes power control circuitry (315) for monitoring the voltage level incoming from a battery (317), and provides power to the rest of the radio communication device (303). The power control circuitry (315) includes a boost regulator (407) that is used to generate an internal reference signal for use throughout the radio communication device including an analog to digital converter (ADC) for digitizing the battery voltage for use by the power control circuitry (315). The power control circuitry (315) compares the digitized battery voltage to thresholds to control power to the remainder of the radio communication device (303). Additionally, a secondary comparator (413) is provided to prevent damage to the battery and radio communication device circuitry. The secondary comparator uses multiple undervoltage thresholds depending upon the power state of the radio communication device (303).

Abstract: An apparatus and method for allowing a mobile device with a dead battery to be charged by another mobile device with a charged battery. The apparatus and method further provide for the prevention of damage to the batteries due to overcurrents that may occur due to battery voltage differences. Light emitting diodes are also provided to indicate the state of the charging device.

Abstract: A system and method for controlling transmitted output power of outdoor antenna units coupled to hand held wireless devices. When the antenna unit is operating with wireless network technology it may also be referred to as an outdoor unit. Transmit power level of an information signal is controlled in the outdoor unit by obtaining a control voltage from the hand held unit. The control voltage is used by the outdoor unit, to adjust the power level of the transmitted information signal. The transmit power level is adjusted by the outdoor unit performing the following steps: (1) detecting the transmit power level of the antenna unit, (2) determining whether the transmit power level is equal to a control voltage, and (3) adjusting the transmit power level based on the control voltage if the transmit power level is not equal to the control voltage. The adjustment of the transmit power level is accomplished by a closed loop circuit that maintains a constant loop gain.

Abstract: The standby battery assembly for use on the portable electronic products is attached to their back or an adequate place. The battery assembly has a casing for housing a plurality of batteries ( two batteries or more). The batteries are exchangeable within the casing, with a selection switch to shift between two batteries, or two batteries are arranged in the 180° direction, reversed direction or same direction to couple with the flexible operation of the portable electronic products.

Abstract: A radio modem is connectable to a booster unit to boost the power of the transmitted RF signal. In order to detect the presence or absence of the booster unit, a DC offset is placed on the connector line between the radio modem and the booster unit. The value of the DC offset depends upon whether the booster unit is connected and this DC value can be detected at the radio modem. Baseband signals are sent on the connector line between the radio modem and the booster unit. The baseband signals can include a power control message which allows the booster unit to determine the power level to transmit. Additionally, a switch placed in the transmit line of the booster unit to prevent the input to a power amplifier in the booster to be destructively high if the radio modem unit does not correctly detect the connection to the booster unit.

Abstract: A portable celullar phone apparatus includes a portable cellular phone and an external adapter for a portable cellular phone. It is possible to suppress an increase in output power of a portable cellular phone transmit amplifier due to a loss at a transmit switch associated with use of an external transmitting antenna by coupling a first output of the transmit switch to a portable cellular phone transmit amplifier and coupling a second output of the transmit switch to an input of a transmit amplifier part of a portable cellular phone external adapter. Deterioration of a NF of a receiving system due to a loss at a receive switch when using an external receiving antenna may be reduced by coupling a first input of a receive switch to a portable cellular phone receive amplifier and coupling a second input of the receive switch to an output of a receive amplifier part of the portable cellular phone external adapter.

Abstract: Power control of output RF signals in a mobile radio communication network is described. A base transceiver has a booster module (12) attached for increasing the power of the output RF signals. A power levelling loop controls the transmission power of the unboosted transceiver. When a booster module (12) is attached, the loop is extendible to control the power of the boosted RF signal output from the booster module. A node (52, 53) connects the amplifier circuit (4) of the transceiver and booster module (12). The node allows an RF signal to be supplied from the amplifier circuit (4) to the booster module (12) for transmission. The node (52, 53) also forms part of the extended power control loop and allows the detected level of the boosted signal to be returned to the transceiver.

Abstract: This invention provides a dual-mode radio communication apparatus which can make normal communications even when an external apparatus is connected to a radio communication apparatus, the communication scheme of which is set in a digital mode. When the radio communication apparatus is not connected to a vehicle-mount kit via a connector in an analog mode, a switch control means of a controller switches a switching circuit to communicate a signal with a base station using a built-in antenna. When the apparatus is connected to the vehicle-mount kit, the switch control means switches the switching circuit to communicate a signal with the base station using an external antenna via the vehicle-mount kit and a booster unit. In the digital mode, the switch control means switches the switching circuit to communicate a signal with the base station using the built-in antenna independently of the connection with the vehicle-mount kit.

Abstract: A power level determination device provides an output voltage usable as a specific reference power level corresponding to each RF input power level. The device includes a peak detector, which detects a pulse-type signal at its input and provides a non-pulse-type signal at its output. N comparators are provided, where N is an integer. Each of the N comparators has an output, a first input coupled to the output of the peak detector, and a second input coupled to a respectively different threshold voltage. The first one of the N comparators has a maximum threshold voltage. The threshold voltages decrease monotonically from No. 1 to No. N. N exclusive-OR components are provided. A first one of the N exclusive-OR components is coupled to ground and to the output of a first one of the N comparators.

Abstract: A cellular telephone receives a first communication signal from a cell-site station and transmits a second communication signal to the cell-site station. The cellular telephone includes an antenna, a duplexer, a receiver, an encoder/decoder apparatus, an acoustic transducer, a transmitter and a controller. The receiver is connected to the antenna through the duplexer. The receiver converts the first communication signal into a voice signal code, and outputs a signal indicating an intensity of the first communication signal. The transmitter is connected to the encoder/decoder apparatus and to the antenna through the duplexer. The receiver converts the input voice code signal from the encoder/decoder apparatus into the second communication signal. The controller is connected to the receiver and the transmitter. The controller controls amplitude of the transmitter corresponding to said intensity of the first communication signal.

Abstract: A multiband phone capable of transmitting a signal within a plurality of distinct frequency bands having a single wide frequency range power detecting device capable of measuring the power of the transmitted signal over all of the plurality of frequency bands. The multiband phone includes multiple power amplifiers, where each power amplifier amplifies the power of a signal transmitted within a different frequency band. A power amplifier controller is provided for controlling the amount of amplification performed by the power amplifiers, where a switching device switches the connection of the power amplifier controller to a selected power amplifier. The single wide frequency range power detecting device is connected to the output of the all of the power amplifiers through a switching device, where the switching device connects the power detecting device to the particular power amplifier selected for transmission.

Abstract: A booster connectable to a handy phone for amplifying the transmission output of the phone is disclosed. A particular transmission message included in a transmission wave output from the phone and determining transmission power is decoded to generate a reference signal matching in level with the transmission power of the message. A variable gain power amplifier has its gain controlled such that the reference signal and the detected signal of the transmission wave output by the booster coincide with each other. As a result, the booster outputs power coincident with the transmission power determined by the particular transmission message. The booster makes it needless to inform the phone of the connection of the booster to the phone, and therefore obviates the need for extra connection lines and circuitry for detecting connection information.

Abstract: A booster connectable to a handy phone for amplifying the transmission output of the phone is disclosed. A particular transmission message included in a transmission wave output from the phone and determining transmission power is decoded to generate a reference signal matching in level with the transmission power of the message. A variable gain power amplifier has its gain controlled such that the reference signal and the detected signal of the transmission wave output by the booster coincide with each other. As a result, the booster outputs power coincident with the transmission power determined by the particular transmission message. The booster makes it needless to inform the phone of the connection of the booster to the phone, and therefore obviates the need for extra connection lines and circuitry for detecting connection information.

Abstract: The present invention provides a portable celullar phone and an external adapter for a portable celullar phone, with which it is possible to suppress an increase in an output power of a portable celullar phone transmit amplifier due to a loss at a transmit switch associated with use of an external transmitting antenna, and to reduce a deterioration of an NF of a receiving system due to a loss at a receive switch associated with use of an external receiving antenna. A transmit switch 109, which is disposed before a portable celullar phone transmit amplifier 103 which is disposed in a portable celullar phone 101, is connected to an input of a transmit amplifier part 115 of a portable celullar phone external adapter 112, while a receive switch 110 which is disposed after a portable celullar phone receive amplifier 108 is connected to an output of a receive amplifier part 118 of the portable celullar phone external adapter 112.

Abstract: An improved filter amplifier for wireless communication is provided. The filter amplifier comprises a talk-in and talk-out booster. The booster utilizes a single local oscillator to down-convert a received signal for filtering and up-convert the received signal for further amplification. A combining unit including amplifier and isolator is operable to receive the filtered signal and amplify and combine the signal. The use of isolators allows for combining signals without interference. The booster amplifier filter unit is designed for use in low reception areas including tunnels and office buildings.

Abstract: A portable telephone of the present invention comprises manual keys, a power-on time memory portion 4 for storing the power-on time being input by the manipulation of the key, a power-on time detection portion 5 for detecting whether the time stored in the power-on time memory portion 4 comes, a validation/invalidation memory portion 6 for storing the validation/invalidation of the automatic power-on function set input by the key manipulation, a main control portion 3 for turning on the power upon detecting the power-on time coming only when the validation of the automatic power-on function set is stored in the validation/invalidation memory portion 6. Accordingly, even if the user sets alarm for a plurality of times, the automatic power-on function can be cancelled by the simple manipulation, and the setting of the automatic power-on function can be returned to the original state by the simple manipulation.

Abstract: In a fixed-site radio transceiver station, information about a tower-mounted radio frequency amplifier apparatus can be automatically transferred from the tower-mounted radio frequency amplifier apparatus to another portion of the fixed-site radio transceiver station. The information is transferred by modulating a power supply current that is drawn from the other portion by the tower-mounted radio frequency amplifier apparatus.

Abstract: When a control section 8 of a mobile communication device detects a voltage drop of a battery during wireless data communication through packet transmission, the control section temporarily stops transmission in the state where reception is maintained. The mobile communication device receives power from a data terminal connected to the mobile communication device through a modem card. When an exchange of batteries is ended and a battery voltage is recovered, transmission is resumed. Transmission data during a period when the transmission is stopped, is stored in a RAM in the modem card.

Abstract: An RF power amplifier with variable bias current is disclosed. The RF amplifier includes a peak detector that detects the peak level of the amplifier input signal. The peak detector generates an output signal in response to the peak level of the amplifier input signal. A bias voltage level setting circuit coupled to the peak detector receives the peak detector output signal and generates a bias voltage in response to the peak detector output signal. An amplifier circuit coupled to the bias voltage level setting circuit receives the bias voltage and the amplifier input signal, and generates an output signal in response to the bias voltage and the amplifier input signal. The disclosed RF amplifier allows amplification of RF signals with high linearity and high efficiency at varying power levels, and extends the maximum power capability of the amplifier.

Abstract: A system for amplifying output transmitted power of a mobile battery powered radio transceiver includes a secondary voltage source, multiple power amplifiers, a central processing unit to control the amplification of the output transmitted signal, and a switch to detect the presence of the radio transceiver. The system includes a method for compensating for the signal loses associated with cabling used in the installation of the amplifying circuitry in an automobile application. According to the first preferred embodiment of the present invention, the method for compensating for signal losses is a manually configured bank of switches. When the amplifying circuitry is installed in the automobile application, the bank of switches is set to specify the amount of loss compensation needed. Multiple amplifiers are used for amplification of the output transmitted signal when the radio transceiver is operating at different frequencies.

Abstract: The present invention provides a power adapter (10) adapted to couple an external antenna (17) to a communication device (30) by way of a cable (12) which is typically plugged into a cigarette lighter of a vehicle or some other power source at one end, and an input connector of the communication device (30) at the other. In particular, the present invention provides a simple one-piece vehicle power adapter which also provides RF input/output capability for connection to an external vehicle antenna. According to certain aspects of the invention, the adapter can be configured to have a variety of selection mechanisms. For example, the communication device could include an RF switch (34) and control circuitry for selecting either the internal or external antenna for optimum reception. Alternatively, the cable could include an external switch (70) for allowing the user to select the desired antenna.

Abstract: The present invention provides a power adapter (10) adapted to couple an external antenna (17) to a communication device (30) by way of a cable (12) which is typically plugged into a cigarette lighter of a vehicle or some other power source at one end, and an input connector of the communication device (30) at the other. In particular, the present invention provides a simple one-piece vehicle power adapter which also provides RF input/output capability for connection to an external vehicle antenna. According to certain aspects of the invention, the adapter can be configured to have a variety of selection mechanisms. For example, the communication device could include an RF switch (34) and control circuitry for selecting either the internal or external antenna for optimum reception. Alternatively, the power adapter could include an external switch (70) for allowing the user to select the desired antenna.

Abstract: A booster for amplifying the signal of a mobile unit of a cellular telephone system. The booster includes a level determination device which produces a reference level based on a power level of a signal received from the mobile unit. The level determination device includes a step voltage circuit which produces a step voltage based on the power level of the signal received from the mobile unit. The step voltage is supplied to a resulting voltage circuit which produces a resulting voltage based on the step voltage, the resulting voltage suitably providing a reference level for the booster.

Abstract: A transmitter for a cellular phone comprising an antenna and being operable at a first radio frequency band and a second radio frequency band is disclosed. The transmitter comprises a first power amplifier and a second power amplifier, one of which is active at a time. The first power amplifier has an input for a first signal at the first radio frequency band, an input for a first control signal and a first output for an amplified first signal. The first output is connectable to the antenna. The second power amplifier has an input for a second signal at the second radio frequency band, an input for a second control signal and a second output for an amplified second signal. The second output is connectable to the antenna. The transmitter further comprises a single control module associated with the first and second outputs of the power amplifiers. The control module generates a control signal for the active power amplifier.

Abstract: A method (300, 400), device (100, 200), phone (200) and base station (200) provide an efficient tracking power converter for variable signals. The tracking power converter includes a feedforward feedback control unit that is coupled to receive a reference signal and to receive at least one feedback signal and is used for determining an optimal control signal in accordance with a predetermined scheme, a pulse width modulation unit that is coupled to the feedforward feedback control unit and is used for modifying a duty ratio to provide a switching signal, and a power converter that is coupled to the pulse width modulation unit and to a power source and is used for providing the dynamic variable output signal.

Abstract: A single channel wireless digital communication network [10] has a cellular topology which includes a central unit [12] ("CW") controlling communications with a plurality of remote units [14] ("TU") in a star configuration. Network access is synchronously controlled through a time division multiplexed cycle [20] of variable total duration having an up-link phase [21] of a variable number of fixed size time slots [25, 27, 27a], each pre-assigned by reservation by a remote unit, and a down-link phase [22] of a variable number of variable size slots [31a, 31b] which are adaptively utilized. The CU adaptively manages all slot assignments according to a variety of parameters. RU up-link slot reservations are confirmed by the CU in a variety of ways. During the up-link phase, RU's which did not reserve a slot on the previous up-link cycle are temporarily suspended and are then polled or periodically tested for re-entry.

Abstract: A mobile communication apparatus includes an amplification circuit, a power supply section, a signal conversion section, a detector, and a control section. The amplification circuit amplifies a received radio signal to output an RF-amplified signal. The power supply section supplies power to the RF amplification circuit. The signal conversion section converts one of the RF-amplified signal and the received radio signal from the RF amplification circuit into an intermediate frequency signal. The detector detects the IF signal output from the signal conversion section. The control section detects the reception sensitivity of the received radio signal on the basis of the RF-amplified signal from the RF amplification circuit, and controls the supply of power from the power supply section to the RF amplification circuit and performs bypass control on the RF amplification circuit on the basis of the detected reception sensitivity and a predetermined reception sensitivity.

Abstract: In a wireless communications system, an RF booster provided intermediate an antenna device for receiving RF signals and a receiver device for providing a predetermined amount of gain to said received RF signals and converting said RF signals to audio frequency signals, the RF booster comprising a first amplifier device for receiving input signals from the antenna via a first cable connecting device, the first low noise amplifier providing a first gain equal to the predetermined amount of gain of the receiver device; a second amplifier device connected in series with the first amplifier device, the second amplifier device connected via a second cable connecting device to the receiver device and providing a second amount of gain of a value sufficient to compensate for signal loss provided by the first and second cable means; and a switch element capable of switching out the first gain of the first amplifier device, the switch element controlled by a control signal in accordance with a sensed level of received i

Abstract: A mobile terminal includes power control logic which limits the maximum transmit power of the mobile radio telephone to conserve battery power when it is operated in a hand-held mode. The mobile radio telephone includes power control logic which sets the transmit power in response to power control codes received from a base station. The power control codes transmitted from the base station correspond to designated power levels. A signal is generated to indicate whether the mobile radio telephone is operated in a hand-held mode. When the mobile radio telephone is operated in a hand-held mode, the power control logic sets the power level at a maximum hand-held power level which is less than the maximum transmit power level.