摘要:
A space diversity receiver apparatus receives signals by two spatially separated antennas, controls the phase of the signal received by one of the antennas by a phase control circuit, combines the phase-controlled signal and the signal received by the other antenna by a combiner and outputs the combined signal. A digital detector digitally detects the center frequency level and the levels on high- and low-frequency sides of the center frequency of the combined signal. Phase is controlled in such a manner that the center frequency level will coincide with a set level and a deviation between the levels on the high- and low-frequency sides of the center frequency will become zero.
摘要:
A communication device includes a number of transmitter/receiver/modem blocks installed in vertical positions. Each of the transmitter/receiver/modem blocks includes a supporting board having a front surface and a back surface, the supporting board including a plurality of fins on the front surface and a plurality of forced air-cooling fans on the supporting board. A front cover encloses the front surface of the supporting board, the front cover and the fins forming a plurality of ducts, the front cover and the front surface forming an internal opening under the fins. A back cover encloses the back surface of the supporting board. First heat-radiating circuit modules are provided at positions adjacent to the fins on the front surface. A second heat-radiating circuit module is provided within the opening. When the forced air-cooling fans operate, the fans produce a flow of air along the plurality of ducts to cool the first heat-radiating circuit modules, and the fans producing a flow of air within the opening to cool the second heat-radiating circuit board.
摘要:
The present invention is directed to a multiplex radio transmission/receiving system. The system includes a plurality of transmission sections provided so as to correspond to a plurality of channels, and a plurality of receiving sections provided so as to correspond to the plurality of channels. Each transmission section includes a modulation section, a first frequency conversion section, a first band-pass filter, a second frequency conversion section, and a second band-pass filter. Each receiving section includes a third band-pass filter, a third frequency conversion section, a fourth band-pass filter, a fourth frequency conversion section, and a demodulation section. By selection of an optimum value for a second intermediate frequency of a transmitter and for a third intermediate frequency of a receiver, a group of transmission radio frequencies (RF) signals and a group of local frequency signals are allocated without overlap. As a result, there can be prepared one type of band-pass filter which has broad band-pass characteristics and which is common among the transmission and receiving sections disposed within the multiplex radio transceiver or among repeaters, thus allowing use of common members.
摘要:
A wireless communication apparatus according to the present invention is composed of a first section for carrying out wireless communication with a multichannel signal and a second section having a plurality of channel units each process a predetermined frequency signal as a channel signal. The wireless communication apparatus is arranged to have a plurality of variable attenuators each provided for corresponding one of the channel signals received from each channel unit of the second section, a combiner for combining outputs from the respective variable attenuators together and outputting the resultant combined signal to the first section, and a control unit for controlling the degree of attenuation of the individual variable attenuators according to the variation of the number of the channel signals. According to the arrangement, the wireless communication apparatus can not only communicate with an opponent station by transmitting a multichannel signal but also effectively suppress negative influence on existing channel even if a new channel unit is additionally provided.
摘要:
A wireless communication apparatus according to the present invention is composed of a first section for carrying out wireless communication with a multichannel signal and a second section having a plurality of channel units each process a predetermined frequency signal as a channel signal. The wireless communication apparatus is arranged to have a plurality of variable attenuators each provided for corresponding one of the channel signals received from each channel unit of the second section, a combiner for combining outputs from the respective variable attenuators together and outputting the resultant combined signal to the first section, and a control unit for controlling the degree of attenuation of the individual variable attenuators according to the variation of the number of the channel signals. According to the arrangement, the wireless communication apparatus can not only communicate with an opponent station by transmitting a multichannel signal but also effectively suppress negative influence on existing channel even if a new channel unit is additionally provided.
摘要:
An electrically-driven steering column apparatus includes a steering column rotatably holding a steering shaft and capable of adjusting a position of the steering wheel, and a power transmission mechanism for transmitting to the steering column a rotational driving force of an electric motor as a position adjusting motion driving force, wherein the power transmission mechanism has a joint constructed of a spherical joint element and a cylindrical joint element in which the spherical joint element is slidably fitted, on within a driving force transmission route.
摘要:
A shaped product, which travels from a shaping die, is passed through a delimiting space between a pressing roller provided in a floating frame of a pressing member and a windowpane introduced in under the pressing roller to be forcibly fitted to the windowpane. Thus, the shaped product is uniformly unified to a peripheral portion of the windowpane by preventing variations in a adhesion force from occurring.
摘要:
A radio device (1), that performs time division duplexing or half frequency duplexing and has transmission output amplifiers (41, 42, 43) that accept a transmission radio-frequency signal and amplify the same, comprises an operating state switching portion (5) that switches the operating state of the radio device (1) between transmission operation and non-transmission operation; and a gain modification portion (Q7, Q71, Q72, Q73, 54) that lowers the gain of the transmission output amplifiers during non-transmission operation, in accordance with a switching signal from the operating state switching portion (5).
摘要:
The adhesive composition of the present invention to be used for bonding a thermoplastic elastomer and a glass article, comprising a chlorinated polyolefin, an epoxy group-containing compound and a silane coupling agent, is excellent in initial adhesive properties and is also excellent in durability, and exhibits sufficient adhesive strength for bonding a thermoplastic elastomer molding and a window glass. Further, a glass plate with a thermoplastic elastomer molding, made by using the adhesive composition, is provided.
摘要:
A wireless communication device performing wireless communication by switching between transmission timing and reception timing in time division, controls to supply a heater or a fan with power supplied from a power supply unit in the reception timing period, and controls to suspend supplying the heater or the fan with the power supplied from the power supply unit in the transmission timing period, in case that a temperature detected by a temperature detector is outside a specified temperature range while a time-division switchover between the transmission timing and the reception timing is performed.