9 results about "Preselector" patented technology

The invention provides a Q / V frequency band large-scale satellite communication load channel optimization method, which comprises a forward input link and a backward output link, and is characterized in that the forward input link comprises a V frequency band multi-beam antenna feed source array, a plurality of input preselectors, a V frequency band low noise amplifier input switch ring and a V / Ka integrated receiver assembly which are connected in sequence; the output end of the V-band multi-beam antenna feed source array is connected with the input end of the V / Ka integrated receiver assembly through a waveguide. The reverse output link comprises a Ka / Q frequency converter, a Q-band channel filter, a Q-band traveling wave tube amplifier, a change-over switch, a Q-band output duplexer or filter and a Q-band feed beam which are connected in sequence, and the output end of the Ka / Q frequency converter is connected to the input end of the Q-band channel filter through a waveguide; and the output end of the Q-band channel filter is directly connected to the input end of the Q-band traveling wave tube amplifier through the waveguide. Therefore, the method is low in link loss, high in space utilization rate and high in feasibility.

The present invention discloses a pre-magnetic separation slurry distributor and method. The distributor includes a box body, and an energy dissipation plate and an overflow plate arranged longitudinally therein. The energy dissipation plate and the overflow plate divide the interior of the box body into a slurry making area, an overflow area and a ore separation area in sequence. A slurry making water inlet and an ore inlet are arranged above the slurry making area, and an ore discharge port is arranged below the ore separation area. The box body includes an obliquely arranged bottom flow plate. A gap is left between the bottom of the energy dissipation plate and the bottom flow plate to form a first channel. A gap is left between the bottom of the overflow plate and the bottom flow plate to form a second channel. An anti-blocking device facing the ore separation area is provided on the bottom flow plate to dredge the second channel. The present invention can make the pre-selector feed ore evenly, avoid slurry sedimentation, and closely combine the functions of slurry making, overflow, ore separation, and anti-blocking. It has a compact structure, convenient operation, stable and reliable operation, low maintenance, and high operating rate, and can efficiently ensure the smooth progress of production.

The low-grade fluorite mine dry type preselector comprises a machine shell and a rotating ring, the top end of the machine shell is fixedly connected with symmetrically-arranged pumping and discharging openings, a plurality of sliding grooves arranged in an array mode are formed in the pumping and discharging openings, limiting grooves are formed in the positions, corresponding to the bottom ends of the sliding grooves, of the pumping and discharging openings, and filter screens are slidably connected into the pumping and discharging openings. Limiting grooves are formed in the filter screen, limiting blocks are fixedly connected to the positions, corresponding to the limiting grooves, of the filter screen, a plurality of supporting rods arranged in an array mode are fixedly connected to the top end of the filter screen, inner rods are connected to the supporting rods in a sliding mode, and round blocks are fixedly connected to the top ends of the inner rods. The filter screen is convenient to clean, through holes in the filter screen are prevented from being blocked by dust and impurities, and the filter screen is prevented from being blocked to affect use of the sorting machine.

The invention belongs to the technical field of digital tuning frequency hopping communication, and discloses a shortwave pre-postselector with high frequency hopping speed, stable and reliable operation, and the shortwave pre-postselector with higher selectivity; the shortwave pre-postselector is arranged inside a shortwave radio station, and is provided with a preselector signal input terminal, a postselector signal input terminal, a preselector signal output terminal and a postselector signal output terminal; the shortwave pre-postselector comprises: a control unit, a limiting protection unit, a first transceiver conversion unit, a first band conversion unit, a first resonance unit, an amplification unit, a second resonance unit, a second band conversion unit and a second transceiver conversion unit.

The invention relates to a monopulse QV capturing and tracking system and method in a frequency conversion mode. The system comprises a Q / V feed antenna, a Q / V feed source, a first V frequency band preselector, a second V frequency band preselector, a first V / Ka receiver, a second V / Ka receiver, a Ka frequency band capturing and tracking receiver, a Ka duplexer and an antenna pointing controller. Downconversion is carried out before the sum and difference signals enter the capturing and tracking receiver, the development difficulty of the capturing and tracking receiver is reduced, and the capturing and tracking receiver can adapt to an antenna with higher working frequency. In order to ensure phase consistency of sum-difference receiving frequency conversion channels, phase consistency control measures such as V / Ka receiving channel local oscillator homology, single machine and waveguide cable layout, temperature control and the like are provided; by adopting an intermittent tracking strategy, the power-up time of the motor winding can be effectively reduced, the service life of the system is prolonged, and the reliability can be improved.

To provide a receiving device that enables visual discrimination between spurious and desired wave components regardless of the width of the band of a received signal.SOLUTION: A receiving device includes a receiver for receiving a radio signal, and a signal processor. The receiver includes a preselector, a frequency converter, and an A / D converter. The preselector limits the band of the received radio signal. The frequency converter mixes the output of the preselector with a local signal to obtain an intermediate frequency signal. The A / D converter generates digital data of the intermediate frequency signal. The signal processor includes an image generator, a calculator, and a spurious manifestation processor. The image generator generates a spectrum image of the radio signal from the digital data. The calculator calculates a spurious generation band from the frequency of the radio signal and the frequency of the local signal. The spurious manifestation processor manifests the spuriousness in the spectrum image.SELECTED DRAWING: Figure 5

The invention relates to a selector (1) for an on-load tap changer, comprising: a fine selector (2) having at least one selector arm (21, 22); a preselector (4), characterized in that the preselector (4) is actuated via at least one selector arm (21, 22) of the fine selector (2).

The present invention provides an antenna with a radio frequency measuring device, comprising an antenna and a radio frequency measuring device; wherein the antenna comprises an antenna vibrator, a vibrator bracket and a signal line; the radio frequency measuring device comprises a shielding shell, a balun, a preselector, a high-frequency amplification module, a mixing module, a detection module, a data processing module, an optical fiber transceiver module and a power module; the balun, the preselector, the high-frequency amplification module, the mixing module, the detection module, the data processing module, the optical fiber transceiver module and the power module are all arranged in the shielding shell; the antenna with a radio frequency measuring device provided by the present invention eliminates the cable loss caused by the radio frequency cable in the conventional test system and greatly reduces the influence of the test uncertainty by adopting an integrated design, and the antenna calibration and the receiver calibration can be completed at one time, so the overall test is more convenient and the test result is more accurate and reliable.

The application discloses an automatic level adjusting system and method for pulse signals, and belongs to the technical field of electronic measurement. The system comprises: in the superheterodyne receiving channel, the system draws out a radio frequency signal through a power divider after a preselector, converts the radio frequency signal into a voltage through a detector, compares the voltage with a digital control reference voltage in a subtraction circuit, and obtains a difference signal. The difference signal is collected by an FPGA and it is judged whether the difference signal exceeds a preset range, and if so, an interrupt is triggered. A CPU responds to the interrupt, adjusts the attenuation of an input attenuator and the switch state of a low noise amplifier according to the polarity and amplitude of the difference signal and according to a preset rule, and forms a closed loop feedback control. The application effectively solves the problems of measurement distortion, low efficiency and equipment damage risk caused by improper manual setting when testing unknown pulse signals, realizes adaptive optimization of a dynamic range, and improves the reliability and accuracy of automatic testing.