CN204304999U - A kind of multichannel short-wave reception device - Google Patents
A kind of multichannel short-wave reception device Download PDFInfo
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- CN204304999U CN204304999U CN201420867660.5U CN201420867660U CN204304999U CN 204304999 U CN204304999 U CN 204304999U CN 201420867660 U CN201420867660 U CN 201420867660U CN 204304999 U CN204304999 U CN 204304999U
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Abstract
The utility model relates to a kind of multichannel short-wave reception device.In this multichannel short-wave reception device, an output of the first power splitter is electrically connected the input of the second power splitter, the input of another output electrical connection the 3rd power splitter; Four output correspondence electrical connections, 4 short wave channel receiving element inputs of the second power splitter, the input of four other 4 short wave channel receiving elements of output correspondence electrical connection of the 3rd power splitter; Each short wave channel receiving element comprises the bandpass filter, automatic gain control circuit, preamplifier and the short wave preselector that are electrically connected successively; The input of the first combiner is electrically connected the output of 4 short wave preselectors respectively, the input of the second combiner is electrically connected the output of other 4 short wave preselectors respectively, and the input of radio frequency digital processing module is electrically connected the output of the first combiner and the output of the second combiner respectively.
Description
Technical field
The utility model belongs to short wave communication device technique field, particularly a kind of multichannel short-wave reception device.The utility model can as " diversity reception " indispensable front end receiver equipment, can within the scope of 2 ~ 30MHz, on set up 8 tunnel concurrent working channels.
Background technology
Current short-wave receiver is substantially all singles, a single frequency can only be operated in, namely a certain moment can only receive and demodulate the signal of a frequency, a kind of modulation system, when needs 8 passages work simultaneously, just need 8 receiver superpositions to use, which adds volume and the power consumption of receiver.
Utility model content
The purpose of this utility model is to propose a kind of multichannel short-wave reception device.
For realizing above-mentioned technical purpose, the utility model adopts following technical scheme to be achieved.
A kind of multichannel short-wave reception device comprises: the first power splitter is to the 3rd power splitter, the first combiner, the second combiner, radio frequency digital processing module and the 1st short wave channel receiving element to the 8th short wave channel receiving element, described first power splitter is one-to-two power splitter, the input of described first power splitter is for accessing short-wave signal, an output of described first power splitter is electrically connected the input of the second power splitter, the input of another output electrical connection the 3rd power splitter; Described second power splitter is one point of four power splitter, described 3rd power splitter is one point of four power splitter, four output correspondences of described second power splitter are electrically connected the input of the 1st short wave channel receiving elements to the 4th short wave channel receiving element, and four outputs correspondences of described 3rd power splitter are electrically connected the input of the 5th short wave channel receiving elements to the 8th short wave channel receiving element;
Natural number i is made to get 1 to 8, i-th short wave channel receiving element comprises the i-th bandpass filter, the i-th automatic gain control circuit, the i-th preamplifier and the i-th short wave preselector that are electrically connected successively, and the input of the i-th bandpass filter is the input of the i-th short wave channel receiving element; Each short wave preselector for selecting the short-wave signal of setpoint frequency section, and for the short-wave signal of selection is outwards exported; Each combiner has 4 inputs and 1 output, the input of the first combiner is electrically connected the output of the 1st short wave preselector to the 4th short wave preselector respectively, the input of the second combiner is electrically connected the output of the 5th short wave preselector to the 8th short wave preselector respectively, the input of described radio frequency digital processing module is electrically connected the output of described first combiner and the output of the second combiner respectively, and the signal that described radio frequency digital processing module is used for receiving carries out RF digitization process.
Feature of the present utility model and further improvement are:
Low-noise amplifier and the bandpass filtering modules block for carrying out bandpass filtering to the signal received also is provided with at the input of the first power splitter, the input of described bandpass filtering modules block is for accessing short-wave signal, the input of described low-noise amplifier is electrically connected the output of described bandpass filtering modules block, and the output of described low-noise amplifier is electrically connected the input of the first power splitter.
Each short wave preselector comprises first band gauge tap, second band gauge tap, the first voltage tuning wave filter, the second voltage tuning wave filter and tertiary voltage tuned filter, short-wave signal frequency selected by described first voltage tuning wave filter is between 1.6MHz to 4MHz, short-wave signal frequency selected by described second voltage tuning wave filter is between 4MHz to 10MHz, and the short-wave signal frequency selected by tertiary voltage tuned filter is between 10MHz to 30MHz;
The preamplifier that the input electrical connection of described first band gauge tap is corresponding, the output of described first band gauge tap is used for optionally connecting the input of the first voltage tuning wave filter, the input of the second voltage tuning wave filter or the input of tertiary voltage tuned filter; The input of described second band gauge tap is used for optionally connecting the output of the first voltage tuning wave filter, the output of the second voltage tuning wave filter or the output of tertiary voltage tuned filter, the combiner that the output electrical connection of described second band gauge tap is corresponding; The voltage tuning wave filter that the voltage tuning wave filter that described first band gauge tap connects connects for described second band gauge tap.
The frequency range of each short wave preselector is within 1.6MHz ~ 30MHz, and the frequency range of any two short wave preselectors is different.
The passband of each bandpass filter is 1.5MHz-32MHz, and each automatic gain control circuit is voltage-controlled attenuator, and each preamplifier is low-noise amplifier.
The beneficial effects of the utility model are: the utility model have employed the demodulation that now increasingly mature RF digitization technology realizes channel, from conventional channel was different in the past, the utility model is directly to short-wave signal modulation /demodulation, greatly reduce numerous and diverse degree and the debugging difficulty of traditional circuit, power consumption, volume, weight etc. can reduce greatly simultaneously.Adopt independent electrically tunable filter and AGC technology to realize separation and the process of multiple signals, realize 8 channel individual reception, promote the practicality of short-wave receiver.The utility model functionally can be regarded as the cluster of multiple single channel receiver, has the features such as power consumption is little, volume is little, lightweight, cost is low, can better meet the requirement of each side.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of multichannel short-wave reception device of the present utility model;
Fig. 2 is the electrical block diagram of short wave preselector of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
A kind of multichannel short-wave reception device of the present utility model mainly comprises RF front-end module, radio frequency digital processing module and power module, wherein, RF front-end module to the radiofrequency signal that short-wave antenna receives carry out pretreatment (radio frequency signal after filtering, amplify after, that generate a pending arrowband, cleaner radiofrequency signal); Radio frequency digital processing module radio frequency signal carries out digitized processing, demodulation process, and radio frequency front-end module carries out AGC control simultaneously, wave band controls, and provides audio signal; The external 14V direct current of power module, have 4 road output voltages (14V, 5V, 3.3V, 1.2V), power module is used for powering respectively to RF front-end module, radio frequency digital processing module, and RF front-end module and radio frequency digital processing module are normally worked.The utility model also comprises power control switch, and power control switch is used for the break-make of the 14V power supply controlling outer confession, plays the effect of multichannel short-wave reception device.
With reference to Fig. 1, it is the structural representation of a kind of multichannel short-wave reception device of the present utility model.RF front-end module comprises the first power splitter to the 3rd power splitter, the first combiner, the second combiner and the 1st short wave channel receiving element to the 8th short wave channel receiving element, the input of the first power splitter is provided with low-noise amplifier and bandpass filtering modules block, the input of bandpass filtering modules block is for accessing short-wave signal, the output of the input electrical connection bandpass filtering modules block of low-noise amplifier, the output of low-noise amplifier is electrically connected the input of the first power splitter.Bandpass filtering modules block is used for carrying out filtering process to the radiofrequency signal from short-wave antenna, bandpass filtering modules block adopts the bandpass filter of 1.5MHz-32MHz, its insertion loss is less than or equal to 1dB (1.5 ~ 30MHz), passband fluctuation is less than or equal to 0.5dB, and 40dB bandwidth is less than or equal to 61.6MHz.Low-noise amplifier amplifies for the radiofrequency signal inputted wherein, and its gain is 12dB.
In the utility model embodiment, first power splitter is one-to-two power splitter, the output of the input electrical connection low-noise amplifier of the first power splitter, an output of the first power splitter is electrically connected the input of the second power splitter, the input of another output electrical connection the 3rd power splitter.Second power splitter is one point of four power splitter, 3rd power splitter is one point of four power splitter, four output correspondences of the second power splitter are electrically connected the input of the 1st short wave channel receiving elements to the 4th short wave channel receiving element, and four outputs correspondences of the 3rd power splitter are electrically connected the input of the 5th short wave channel receiving elements to the 8th short wave channel receiving element.Natural number i is made to get 1 to 8, i-th short wave channel receiving element comprises the i-th bandpass filter, the i-th automatic gain control circuit, the i-th preamplifier and the i-th short wave preselector that are electrically connected successively, and the input of the i-th bandpass filter is the input of the i-th short wave channel receiving element.
In the i-th short wave channel receiving element, the signal that i-th bandpass filter is used for receiving carries out filtering, i-th bandpass filter adopts the bandpass filter of 1.5MHz-32MHz, its insertion loss is less than or equal to 1dB (1.5 ~ 30MHz), passband fluctuation is less than or equal to 0.5dB, and 40dB bandwidth is less than or equal to 61.6MHz.I-th automatic gain control circuit is when receiving control signal, and can carry out automatic growth control according to control signal to the signal received, automatic gain control circuit adopts Serial Control mode, and controlled range is 0 ~ 31.5dB, minimum step 0.5dB.In the utility model embodiment, 8 receive channels have oneself automatic gain control circuit separately, can carry out AGC control respectively to 8 channels simultaneously.The dynamic range of each branch road can be ensured like this, a certain road large-signal distortion effect also can be avoided normally to work to other paths.
For short-wave receiver, received signal level depends on radio-frequency input signals and receiver front end gain amplifier, because short-wave signal is slack-off weak signal in a period of time, therefore the dynamic change of radio-frequency input signals size is very large, do not have accurately AGC control system to the signal transacting of rear end and communication quality very unfavorable.When short-wave signal is very weak, needs to improve gain, sampled signal can carried out close to full range.When signal is very strong, needs to reduce gain, otherwise can distortion be caused.The effect of automatic gain control circuit is exactly the gain automatically adjusting receiver, input signal amplitude is controlled within the specific limits, improves the dynamic range of receiving of receiver.In the utility model, the circuit that each automatic gain control circuit adopts one-level decay two-stage to amplify.Radiofrequency signal inputs advanced attenuator, laggard amplifier.Attenuator adopts DAT-31R5-SP, and first order amplifier adopts 3SK131 circuit, and second level amplifier adopts LMH6703 circuit.Attenuator mainly resists the input of large-signal, and attenuation range is 0-31.5dB.3SK131 is RF controllable amplifier, noise coefficient 1.3dB, and gain amplifier is 23dB to the maximum, voltage and current: [email protected] is low distortion operational amplifier, gain 10dB.The feedback circuit major control of automatic gain control circuit be the attenuation multiple of attenuator DAT-31R5-SP and the multiplication factor of amplifier 3SK131.
In the utility model embodiment, the i-th preamplifier is special low-noise amplifier HE316-1, can provide the gain of maximum 12dB, and its noise coefficient is less than 1dB.I-th short wave preselector for selecting setpoint frequency section short-wave signal, and for the narrow band signal of selection is outwards exported.The frequency range (frequency range that the short-wave signal frequency selected by each short wave preselector forms) of each short wave preselector within 1.6MHz ~ 30MHz, the different and non-overlapping copies of the frequency range of any two short wave preselectors.
In the utility model embodiment, each combiner is 4 conjunction 1 combiners, each combiner has 4 inputs and 1 output, the input of the first combiner is electrically connected the output of the 1st short wave preselector to the 4th short wave preselector respectively, the input of the second combiner is electrically connected the output of the 5th short wave preselector to the 8th short wave preselector respectively, the input of radio frequency digital processing module is electrically connected the output of described first combiner and the output of the second combiner respectively, the signal that described radio frequency digital processing module is used for receiving carries out RF digitization process.Can find out, the 8 road narrow band signals come by 8 short wave preselectors enter 2 combiners, synthesize 2 main line signals altogether, deliver to radio frequency digital processing module and be for further processing.
With reference to Fig. 2, it is the electrical block diagram of short wave preselector of the present utility model.In the utility model embodiment, each short wave preselector comprises first band gauge tap, second band gauge tap, the first voltage tuning wave filter, the second voltage tuning wave filter and tertiary voltage tuned filter, short-wave signal frequency selected by described first voltage tuning wave filter is between 1.6MHz to 4MHz, short-wave signal frequency selected by described second voltage tuning wave filter is between 4MHz to 10MHz, and the short-wave signal frequency selected by tertiary voltage tuned filter is between 10MHz to 30MHz.The preamplifier that the input electrical connection of first band gauge tap is corresponding, the output of first band gauge tap is used for optionally connecting the input of the first voltage tuning wave filter, the input of the second voltage tuning wave filter or the input of tertiary voltage tuned filter; The input of second band gauge tap is used for optionally connecting the output of the first voltage tuning wave filter, the output of the second voltage tuning wave filter or the output of tertiary voltage tuned filter, the combiner that the output electrical connection of second band gauge tap is corresponding; The voltage tuning wave filter that the voltage tuning wave filter that first band gauge tap connects connects for second band gauge tap.
In the utility model embodiment, each short wave preselector is the good electric tuning narrow band filter of property alternatively, has the advantages that speed is fast, frequency-selecting performance is good, inhibition is high.Its circuit comprises resonant network and some weighted capacitance of a preset parameter, when voltage tuning wave filter and wave band gauge tap are controlled, tuner parameters is calculated according to operating center frequency, realize controlling needed for short wave preselector by digital interface circuit, reach the object of frequency-tracking, filtering.Short wave preselector is applied to short-wave receiver front end, can filtering collection of letters road spuious, radiofrequency signal is by after short wave preselector filtering, and out-of-band noise obtains further filtering, is easier to carry out digital demodulation, improves the practical sensitivity of short-wave receiver.8 road short wave preselectors are made up of control circuit, memory, D/A converter, amplifier and 8 road voltage tuning wave filters.Wherein in No. 8 electrically tunable filters, each road is all operated in 1.6MHz ~ 30MHz, is divided into three sections: 1.6MHz ~ 4MHz, 4MHz ~ 10MHz, 10MHz ~ 30MHz.The break-make of each wave band gauge tap is determined by control signal, the cut-off frequency of each voltage tuning wave filter is determined by the voltage control signal received, specifically, the control module of each short wave preselector first outwards exports 8 tunnel FREQUENCY CONTROL codes, every road FREQUENCY CONTROL code is after D/A conversion, generate 8 VTs, 8 VT signals export the control end of the voltage tuning wave filter of 8 corresponding short wave preselectors to, like this, the voltage tuning wave filter of each short wave preselector is operated in specific operating frequency range, further raising Out-of-band rejection characteristic, lifting means practicality.
In the utility model embodiment, radio frequency digital processing module comprises arm processor, DSP and FPGA, FPGA is electrically connected DSP and arm processor respectively, the model of arm processor is S3C2440X, arm processor is provided with sdram memory, FLASH memory and network interface, FPGA uses 38.4MHz crystal oscillator to provide clock, FPGA is provided with programmable read only memory (PROM).DSP is provided with FLASH memory.The input of FPGA is provided with AD9245 chip, and the input of AD9245 chip is electrically connected the output of each combiner, for carrying out analog-to-digital conversion to the 8 tunnel radiofrequency signals received, and for the every railway digital signal after analog-to-digital conversion is sent to FPGA.FPGA is used for carrying out down-converted to the every railway digital signal from AD9245 chip, for down-converted Hou Mei road signal is sent to DSP, DSP is used for carrying out base band demodulating to the every road signal from FPGA, outwards exports for the every road audio signal generated by base band demodulating.The output of DSP is electrically connected with 4 speech chips, and DSP is used for each speech chip for exporting corresponding two-way audio signal, and each speech chip is used for the two-way audio signal of reception to be converted to corresponding two-way simulated audio signal.The model of each speech chip is AIC20, just can hear voice signal at the output of each speech chip by earphone.Communicated by Mcbsp0 with Mcbsp1 between each speech chip with main DSP.
In the utility model embodiment, the output of FPGA is also electrically connected with 8 digital to analog converters, FPGA exports digital to analog converter corresponding to corresponding FREQUENCY CONTROL code value, every road FREQUENCY CONTROL code is after D/A conversion, generate 8 VTs, 8 VT signals export the control end of the voltage tuning wave filter of 8 corresponding short wave preselectors to.
In the utility model embodiment, the realization of numeral (filtering) the frequency conversion DDC/DUC process that FPGA primary responsibility amount of calculation is larger, various communication interface and agreement.FPGA is also for controlling related device, be described as follows, 1) the wave band gauge tap of FPGA to 8 road short wave preselectors controls, practical 8 pairs of holding wires, adopt LVTTL level, realized the waveband selection of each short wave preselector by the low and high level controlling often pair of holding wire: 00 represents that 1.6MHz to 4MHz, 01 represents that 4MHz to 10MHz, 10 represents 10MHz to 30MHz; 2) FPGA is to the control of the voltage tuning wave filter of 8 short wave preselectors, use 5 holding wires, adopt LVTTL level, make the digital to analog converter having 8 tunnels outputs export different voltage, to control the centre frequency of corresponding voltage tuning wave filter by holding wire; 3) attenuator of FPGA to 8 automatic gain control circuits controls, and for each automatic gain control circuit, adopts 3 holding wires, practical LVTTL level, and the attenuation being controlled attenuator by holding wire completes part AGC control; 4) amplifier of FPGA to 8 automatic gain control circuits controls, and exports 8 analog voltage signals (between size 0 ~ 1.7V), and the gain carrying out control amplifier by controlling the different voltage of output completes part AGC and controls.In the utility model, DSP primary responsibility controls and base band calculation process, and arm processor mainly completes ICP/IP protocol and control work.
In the utility model embodiment, radio frequency digital processing module also comprises power supply processing unit, power supply processing unit is for accessing the 3.3V direct current from power module, for 3.3V direct current is carried out linear transformation, export the direct current with following several voltage: 1.2V, 1.25V, 1.6V, 1.8V, 2.5V.
Radio frequency digital processing module tool has the following advantages:
1) radio frequency digital processing module is in the frequency conversion of numeric field settling signal.Namely be close to and directly the radiofrequency signal come from antenna delivered to ADC and sampled, complete digitlization frequency conversion, thus can make signal comparatively early enter numeric field, various modern signal processing algorithm is adopted to complete demodulation, compared with the frequency conversion at analog domain settling signal, the non-linear distortion of the signal that analog domain frequency conversion produces and the complexity of circuit can be greatly reduced.
2) radio frequency digital processing module has the simple feature of Direct Conversion system circuit, therefore can greatly reduce number of devices, thus make greatly to be reduced by the volume of short-wave receiver, weight alleviates greatly.
3) because radiofrequency signal directly enters numeric field, therefore can the setting of complete pair of stations parameter by computer control terminal, and do not need to change corresponding hardware circuit, realize remote control.Thus add flexibility and the autgmentability of radio station function upgrading, the construction cycle shortening product and the risk reducing model change and development cost.
On the whole, workflow of the present utility model may be summarized to be: receive from short-wave antenna the radiofrequency signal come and first enter after bandpass filter carries out filtering, the power splitter of 1 point 2 is entered again after low-noise amplifier, enter the power splitter of 1 point 4 more respectively, be divided into out 8 branch roads, every bar branch road, through automatic gain control circuit, completes the amplification filtering of radiofrequency signal through electrically tunable filter, give radio frequency digital processing module process the signal that electrically tunable filter exports.Radio frequency digital processing module adopts RF digitization technology, is completed by analog-to-digital conversion device, FPGA, DSP, ARM.Analog-to-digital conversion device adopts the high speed device of 16bits to complete analog-to-digital conversion; FPGA completes 8 path channels realizations, down coversion, signal capture.DSP mainly completes and controls AIC20, and settling signal demodulation pass to FPGA by under information, the multi-channel operation situation of FPGA to receiver controls, inquires about.
In sum, the utility model makes the digitalization receiving subsystem at RF machine of 8 channels work alone simultaneously, receives and demodulates output at synchronization to multichannel short-wave signal, improves RF digitization channel receptivity, reduces monkey chatter etc.The utility model has following several feature:
1) receive channel can be set up in the frequency of setting, maximumly support that the number of channel is 8 tunnels, and can need to carry out channel parameter setting according to user.
2) radio frequency digital processing module adopts DSP in conjunction with FPGA technology, directly completes demodulation to short-wave signal, greatly reduces numerous and diverse degree and the debugging difficulty of traditional circuit in the past, and power consumption, volume etc. can reduce greatly simultaneously.
3) each short wave preselector alternatively good electric tuning narrow band filter of property, has the advantages that speed is fast, frequency-selecting performance is good, inhibition is high.Be applied to short-wave receiver front end, filtering collection of letters road out-of-band noise is spuious, is easier to carry out digital demodulation, improves the practical sensitivity of short-wave reception.
4) 8 road AGC (automatic growth control) independent control technologys are adopted.The utility model carries out gain control to the signal of 8 passages respectively, increases the dynamic range of passage, makes short-wave receiver can carry out corresponding process to the larger signal of amplitude and the less signal of amplitude in communication process, receiver is normally worked.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (5)
1. a multichannel short-wave reception device, it is characterized in that, comprise: the first power splitter is to the 3rd power splitter, the first combiner, the second combiner, radio frequency digital processing module and the 1st short wave channel receiving element to the 8th short wave channel receiving element, described first power splitter is one-to-two power splitter, the input of described first power splitter is for accessing short-wave signal, an output of described first power splitter is electrically connected the input of the second power splitter, the input of another output electrical connection the 3rd power splitter; Described second power splitter is one point of four power splitter, described 3rd power splitter is one point of four power splitter, four output correspondences of described second power splitter are electrically connected the input of the 1st short wave channel receiving elements to the 4th short wave channel receiving element, and four outputs correspondences of described 3rd power splitter are electrically connected the input of the 5th short wave channel receiving elements to the 8th short wave channel receiving element;
Natural number i is made to get 1 to 8, i-th short wave channel receiving element comprises the i-th bandpass filter, the i-th automatic gain control circuit, the i-th preamplifier and the i-th short wave preselector that are electrically connected successively, and the input of the i-th bandpass filter is the input of the i-th short wave channel receiving element; Each short wave preselector for selecting the short-wave signal of setpoint frequency section, and for the short-wave signal of selection is outwards exported; Each combiner has 4 inputs and 1 output, the input of the first combiner is electrically connected the output of the 1st short wave preselector to the 4th short wave preselector respectively, the input of the second combiner is electrically connected the output of the 5th short wave preselector to the 8th short wave preselector respectively, the input of described radio frequency digital processing module is electrically connected the output of described first combiner and the output of the second combiner respectively, and the signal that described radio frequency digital processing module is used for receiving carries out RF digitization process.
2. a kind of multichannel short-wave reception device as claimed in claim 1, it is characterized in that, low-noise amplifier and the bandpass filtering modules block for carrying out bandpass filtering to the signal received also is provided with at the input of the first power splitter, the input of described bandpass filtering modules block is for accessing short-wave signal, the input of described low-noise amplifier is electrically connected the output of described bandpass filtering modules block, and the output of described low-noise amplifier is electrically connected the input of the first power splitter.
3. as right will remove a kind of multichannel short-wave reception device as described in 1, it is characterized in that, each short wave preselector comprises first band gauge tap, second band gauge tap, first voltage tuning wave filter, second voltage tuning wave filter and tertiary voltage tuned filter, short-wave signal frequency selected by described first voltage tuning wave filter is between 1.6MHz to 4MHz, short-wave signal frequency selected by described second voltage tuning wave filter is between 4MHz to 10MHz, short-wave signal frequency selected by tertiary voltage tuned filter is between 10MHz to 30MHz,
The preamplifier that the input electrical connection of described first band gauge tap is corresponding, the output of described first band gauge tap is used for optionally connecting the input of the first voltage tuning wave filter, the input of the second voltage tuning wave filter or the input of tertiary voltage tuned filter; The input of described second band gauge tap is used for optionally connecting the output of the first voltage tuning wave filter, the output of the second voltage tuning wave filter or the output of tertiary voltage tuned filter, the combiner that the output electrical connection of described second band gauge tap is corresponding; The voltage tuning wave filter that the voltage tuning wave filter that described first band gauge tap connects connects for described second band gauge tap.
4. a kind of multichannel short-wave reception device as claimed in claim 1, is characterized in that, the frequency range of each short wave preselector is within 1.6MHz ~ 30MHz, and the frequency range of any two short wave preselectors is different.
5. a kind of multichannel short-wave reception device as claimed in claim 1, is characterized in that, the passband of each bandpass filter is 1.5MHz-32MHz, and each automatic gain control circuit is voltage-controlled attenuator, and each preamplifier is low-noise amplifier.
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| CN201420867660.5U CN204304999U (en) | 2014-12-31 | 2014-12-31 | A kind of multichannel short-wave reception device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467888A (en) * | 2014-12-31 | 2015-03-25 | 陕西烽火电子股份有限公司 | Multi-channel shortwave receiving device |
| CN104820197A (en) * | 2015-05-01 | 2015-08-05 | 武汉中科波谱技术有限公司 | Pre-posed amplification system for nuclear magnetic resonance spectrometer or imaging instrument |
| CN107749764A (en) * | 2017-09-15 | 2018-03-02 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The method of sampling of multichannel Larger Dynamic signal |
| CN110444228A (en) * | 2019-07-03 | 2019-11-12 | 深圳华海尖兵科技有限公司 | A kind of short-wave reception method and system |
-
2014
- 2014-12-31 CN CN201420867660.5U patent/CN204304999U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467888A (en) * | 2014-12-31 | 2015-03-25 | 陕西烽火电子股份有限公司 | Multi-channel shortwave receiving device |
| CN104820197A (en) * | 2015-05-01 | 2015-08-05 | 武汉中科波谱技术有限公司 | Pre-posed amplification system for nuclear magnetic resonance spectrometer or imaging instrument |
| CN107749764A (en) * | 2017-09-15 | 2018-03-02 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The method of sampling of multichannel Larger Dynamic signal |
| CN110444228A (en) * | 2019-07-03 | 2019-11-12 | 深圳华海尖兵科技有限公司 | A kind of short-wave reception method and system |
| CN110444228B (en) * | 2019-07-03 | 2021-07-13 | 深圳华海尖兵科技有限公司 | Short wave receiving method and system |
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