CN201274467Y - Indoor signal coverage system and repeater applied to the system - Google Patents
Indoor signal coverage system and repeater applied to the system Download PDFInfo
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- CN201274467Y CN201274467Y CNU2008201033267U CN200820103326U CN201274467Y CN 201274467 Y CN201274467 Y CN 201274467Y CN U2008201033267 U CNU2008201033267 U CN U2008201033267U CN 200820103326 U CN200820103326 U CN 200820103326U CN 201274467 Y CN201274467 Y CN 201274467Y
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Abstract
The utility model relates to an indoor signal coverage system for CATV line transmission and a repeater thereof. CATV line transmission signals of the system include AC signals, monitoring modulation signals, uplink signals, downlink signals and reference local oscillator signals. The repeater consists of a feed, a splitter, a combiner, a MODEM module, a reference local oscillator module, an uplink radio frequency module and a downlink radio frequency module. The uplink radio frequency module can obtain an uplink signal according to a signal from a mobile terminal to be processed by a local oscillator. The downlink radio frequency module can obtain a radio frequency signal according to a downlink signal to be processed by the local oscillator and output the radio frequency signal through an antenna. The splitter and the combiner can synthesize the monitoring result signal generated by the MODEM module and the uplink signal generated by the uplink radio frequency module and can transmit the synthesized signal to the CATV transmission line. The utility model has the advantages of low insertion loss during signal transmission, convenient system construction, low cost, direct communication between a donor and a remote and whole distributed system monitoring.
Description
Technical field
The utility model relates to a kind of indoor signal covering system and is applied to direct amplification machine in this system, refer to especially a kind of with the transmission of CATV line the indoor signal covering system and be applied to direct amplification machine in this system.
Background technology
Radio signal coverage system mainly adopts coaxial cable and trunk amplifier networking in the conventional chamber in the current application, yet there are problems in radio signal coverage system in this conventional chamber, for example: traditional coaxial scheme far end radio frequency signal transmission use coaxial cable that covers, Insertion Loss is bigger; Coaxial system can not carry out network management monitoring, can monitor at most driedly to put one-level equipment, and can not whole compartment system be monitored, and is unfavorable for that final-period management safeguards; Coaxial system has following difficulty aspect construction: cable size is big, the bending radius that hardness is strong, needs are excessive; The fixedly difficulty of cable; Difficult wiring, long construction period; Signal is difficult to coupling endways.In addition, coaxial system is introduced noise when adopting active power to amplify the counteracting loss bigger, influences communication quality; Be difficult to solve and ensure that the distribution of large tracts of land scene covers communication quality; Simultaneously, the covering information source that distributes base station is provided with dispersion, and machine room is numerous, and maintenance workload is huge; Compartment system is big for the loss otherness of different system, is difficult to compatible multisystem; Problems such as in addition, the webmaster ability of distribution covering system is weak.
Summary of the invention
Based on foregoing, be necessary to provide a kind of indoor signal covering system by the transmission of CATV line, not only reach simple and practical but also have the effect of good indoor covering.
This indoor signal covering system comprises a micropower signal source, a master unit, reaches at least one far-end unit.This master unit is connected with this far-end unit by the CATV transmission line, and this CATV transmission line is used for transmission signals, and wherein, this signal comprises direct current signal, pilot signal, upward signal, downstream signal and reference local oscillator signal.This far-end unit comprises: a loop, one minute/mixer, a modulation (MODEM) module, a reference local oscillator module, a up radio-frequency module and a descending radio-frequency module.
This loop is used to receive the signal from the CATV transmission line, isolates direct current signal wherein, this direct current signal is handled being this far-end unit power supply, and the residual signal after the output separation.This branch/mixer is used to receive the residual signal after the separation of loop output, isolates wherein pilot signal, reference local oscillator signal, upward signal and downstream signal.This MODEM module is used to receive the pilot signal from branch/mixer, this pilot signal handled obtain monitored instruction processing unit to this far-end unit, simultaneously, this MODEM module also is used for the monitored results that this processing unit produces is handled acquisition one monitored results signal.This reference local oscillator module is used to receive the reference local oscillator signal from branch/mixer, this reference local oscillator signal is handled obtaining a reference local oscillator.This up radio-frequency module is used to receive the signal from portable terminal, according to the reference local oscillator that the reference local oscillator module produces, this signal is handled the acquisition upward signal.This downlink radio frequency module is used to receive the downstream signal from branch/mixer, according to the reference local oscillator that the reference local oscillator module produces, this downstream signal is handled acquisition one radiofrequency signal, and exports this radiofrequency signal by antenna.This branch/mixer also is used for the upward signal of the monitored results signal of MODEM module generation and the generation of up radio-frequency module is synthesized, and exports synthetic signal to the CATV transmission line.
Also be necessary to provide the direct amplification machine that is applied in this indoor signal covering system, it is connected with master unit by the CATV transmission line.This direct amplification machine comprises a loop, one minute/mixer, a modulation (MODEM) module, a reference local oscillator module, a up radio-frequency module and a descending radio-frequency module.This loop is used to receive the signal from the CATV transmission line, isolates direct current signal wherein, this direct current signal is handled being this direct amplification machine power supply, and the residual signal after the output separation.This branch/mixer is used to receive the residual signal after the separation of loop output, isolates wherein pilot signal, reference local oscillator signal, upward signal and downstream signal.This MODEM module is used to receive the pilot signal from branch/mixer, this pilot signal handled obtain monitored instruction processing unit to this direct amplification machine, simultaneously, this MODEM module also is used for the monitored results that this processing unit produces is handled acquisition one monitored results signal.This reference local oscillator module is used to receive the reference local oscillator signal from branch/mixer, this reference local oscillator signal is handled obtaining a reference local oscillator.This up radio-frequency module is used to receive the signal from portable terminal, according to the reference local oscillator that the reference local oscillator module produces, this signal is handled the acquisition upward signal.This downlink radio frequency module is used to receive the downstream signal from branch/mixer, according to the reference local oscillator that the reference local oscillator module produces, this downstream signal is handled acquisition one radiofrequency signal, and exports this radiofrequency signal by antenna.This branch/mixer also is used for the upward signal of the monitored results signal of MODEM module generation and the generation of up radio-frequency module is synthesized, and exports synthetic signal to the CATV transmission line.
Compared to prior art, indoor signal covering system that should be by CATV line transmission and be applied to direct amplification machine in this system has that Insertion Loss is littler in the signals transmission, system construction is more convenient, the cost cost is cheap relatively; And nearly far-end can directly be realized communication, carries out network management monitoring, the advantage that can monitor whole compartment system.
Description of drawings
Fig. 1 is the hardware structure figure of the utility model indoor signal covering system in first execution mode.
Fig. 2 is the hardware structure figure of the utility model indoor signal covering system in second execution mode.
Fig. 3 is the hardware structure figure of far-end unit in an execution mode among Fig. 1 and Fig. 2.
Fig. 4 is the hardware structure figure of branch/mixer in an execution mode among Fig. 3.
Fig. 5 is the hardware structure figure of MODEM module in an execution mode among Fig. 3.
Fig. 6 is the hardware structure figure of reference local oscillator module in an execution mode among Fig. 3.
Fig. 7 is the hardware structure figure of downlink radio frequency module in an execution mode among Fig. 3.
Fig. 8 is the hardware structure figure of up radio-frequency module in an execution mode among Fig. 3.
Fig. 9 is the signal distribution plots of CATV transmission line in an execution mode among Fig. 1 and Fig. 2.
Embodiment
As shown in Figure 1, be the hardware structure figure of the utility model indoor signal covering system in first execution mode.This system comprises a micropower signal source 10, a master unit 11, a far-end unit 12, and wherein, micropower signal source 10 directly is connected with master unit 11, and this far-end unit 12 is connected with master unit 11 by CATV transmission line 13.In another embodiment, as shown in Figure 2, this master unit 11 also can be expanded by at least one expanding element 15, and this expanding element 15 is connected with master unit 11 by optical fiber 16, is connected by 12 of CATV transmission line 13 and far-end units.
The multiple signal of these CATV transmission line 13 transmission.For convenience of explanation, in the present embodiment, moving the 24M system module with GSM is example, as shown in Figure 8, the signal that CATV transmission line 13 transmits comprises direct current signal, MODEM pilot signal (be received as the 185M signal, be emitted as the 215M signal), upward signal (intermediate frequency 70M, bandwidth 24M), downstream signal (intermediate frequency 115M, bandwidth 24M), and reference local oscillator signal 10M.
As shown in Figure 3, this far-end unit 12 is a direct amplification machine, comprises a loop 30, one minute/mixer 31, a modulation (MODEM) module 32, a reference local oscillator module 33, one up radio-frequency module 34 and a descending radio-frequency module 35.Wherein, this loop 30 is used to receive the signal from CATV transmission line 13, isolates direct current signal wherein, this direct current signal is handled being this direct amplification machine 12 power supplies, and the residual signal after the output separation.This branch/mixer 31 is used to receive the residual signal after the separation of loop 30 outputs, isolates wherein MODEM pilot signal, reference local oscillator signal, upward signal and downstream signal.This MODEM module 32 is used to receive the MODEM pilot signal from branch/mixer 31, this pilot signal handled obtain monitored instruction processing unit (CPU) 37 to this direct amplification machine 12, simultaneously, this MODEM module 32 also is used for the monitored results that this CPU 37 produces is handled acquisition one monitored results signal.This reference local oscillator module 33 is used to receive the reference local oscillator signal from branch/mixer 31, this reference local oscillator signal is handled obtaining a reference local oscillator.This up radio-frequency module 34 is used to receive the signal from portable terminal 14, according to the reference local oscillator that reference local oscillator module 33 produces, this signal is handled the acquisition upward signal.This downlink radio frequency module 35 is used to receive the downstream signal from branch/mixer 31, according to the reference local oscillator that reference local oscillator module 33 produces, this downstream signal is handled acquisition one radiofrequency signal, and by antenna 38 these radiofrequency signals of output.This branch/mixer 31 also is used for the upward signal of the monitored results signal of MODEM module 32 generations and 34 generations of up radio-frequency module is synthesized, and exports synthetic signal to CATV transmission line 13.
In one embodiment, as shown in Figure 4, this branch/mixer 31 is made of a 3dB bridge 311, the 2nd 3dB bridge 312 and the 3rd 3dB313 bridge.Wherein a 3dB bridge 311 1 ends connect loop 30, the other end connects the 2nd 3dB bridge 312 and the 3rd 3dB bridge 313, the 2nd 3dB bridge 312 1 ends connect a 3dB bridge 311, the other end connects MODEM module 32 and reference local oscillator module 33, the three 3dB bridges 313 1 ends connect up radio-frequency module 34 and downlink radio frequency module 35.
For the ease of understanding the utility model, the utility model is in conjunction with the implementation of specific embodiment explanation direct amplification machine 12.From the signal of CATV transmission line 13 transmission, through loop 30, isolate supply voltage, because the decay of CATV transmission line 13 is generally 20V-27V, carry out voltage stabilizing to 9V with the Switching Power Supply (not shown) then, give whole direct amplification machine 12 power supplies.Other signals are isolated MODEM pilot signal, 10M reference local oscillator signal one tunnel through a 3dB bridge 311; Another road of uplink and downlink signals.Wherein MODEM pilot signal, 10M reference local oscillator signal one tunnel through the 2nd 3dB bridge 312, are isolated the MODEM pilot signal again, handle to MODEM module 32; 10M reference local oscillator signal enters 33 of reference local oscillator moulds and handles.Another road uplink and downlink signals also connects the 3rd 3dB bridge 313, isolate upward signal and downstream signal, be connected respectively to up radio-frequency module 34, downlink radio frequency module 35 is handled, the uplink and downlink signals of handling at last is connected to duplexer 36, downstream signal radiate by antenna 38 through duplexer 36; Upward signal receives by antenna 38, through duplexer 36, to up radio-frequency module 34.For concrete signal processing in each module in the above-mentioned direct amplification machine 12, please refer to beneath description to each module.
As shown in Figure 5, this MODEM module 32 comprises a demodulation part 321 and a modulating part 322.Wherein, this demodulation part 321 comprises two-stage Surface Acoustic Wave Filter 50, intermediate-frequency tube 51, power detector 52 and high-speed comparator 53.The pilot signal that separates from branch/mixer 31 (i.e. the 2nd 3dB bridge 312) is through dual stage filter 50, intermediate-frequency tube amplifies 51, be input to power detector 52 and transfer aanalogvoltage to, the RXD that transfers Transistor-Transistor Logic level to and export CPU37 to through high-speed comparator 53 receives the pin (not shown) and carries out data processing again; This modulating part 322 comprises analog switch 54, intermediate-frequency tube 51, two-stage Surface Acoustic Wave Filter 50, after the data protocol that will send from CPU37 is beaten and is embraced, the Transistor-Transistor Logic level that sends the pin (not shown) by TXD is through analog switch 54 control intermediate frequency 215M tone signals, realize that the amplitude modulation modulation produces amplitude-modulated signal, this amplitude-modulated signal exports the 2nd 3dB bridge 312 to through intermediate-frequency tube 51, two-stage Surface Acoustic Wave Filter 50.
As shown in Figure 6, this reference local oscillator module 33 comprises first low pass filter 60, first intermediate-frequency tube 61, second low pass filter 60, second intermediate-frequency tube 61 and a PLL phase-locked loop 62.Wherein, this first low pass filter 60, first intermediate-frequency tube 61, second low pass filter 60, second intermediate-frequency tube 61 and PLL phase-locked loop 62 connect by the series connection form.10M reference local oscillator Signal Processing flow process is: isolated 10M reference signal at first will be through first low pass filter 60, because signal is less, amplify through first medium-frequency tube 61, again through second low pass filter 60, amplify through second medium-frequency tube 61 again, power reaches 0dBm, then as the reference local oscillator of up-downgoing PLL phase-locked loop 62.
As shown in Figure 7, this downlink radio frequency module 35 comprises first intermediate-frequency tube 70, intermediate-frequency filter 71, second intermediate-frequency tube 70, frequency mixer 72, first Surface Acoustic Wave Filter 73, the first radio frequency amplifier tube 74, numerical-control attenuator 75, second Surface Acoustic Wave Filter 73, the second radio frequency amplifier tube 74 and the 3rd radio frequency amplifier tube 74, wherein, from the downstream signal of branch/mixer 31 through first intermediate-frequency tube 70, intermediate-frequency filter 71, amplify through second intermediate-frequency tube 70 again, upconverting to centre frequency with 72 mixing of reference local oscillator 827M process frequency mixer is 942M, the downlink radio-frequency signal of bandwidth 24M, through 73 filtering of first Surface Acoustic Wave Filter, the first radio frequency amplifier tube 74 amplifies, follow numerical-control attenuator 75, rising tone table filter filtering 73 exports antenna 38 to through the second radio frequency amplifier tube 74 and the amplification of the 3rd radio frequency amplifier tube 74 two-stages at last again.
As shown in Figure 8, this up radio-frequency module 34 comprises low noise amplifier 80, first Surface Acoustic Wave Filter 81, the first radio frequency amplifier tube 82, second Surface Acoustic Wave Filter 81, numerical-control attenuator 83, the second radio frequency amplifier tube 82, the 3rd Surface Acoustic Wave Filter 81, frequency mixer 84 and intermediate-frequency tube 85.Wherein, signal from portable terminal 14 amplifies through low noise amplifier 80, then through the first Surface Acoustic Wave Filter filtering 81, the first radio frequency amplifier tube 82 amplifies, again through second Surface Acoustic Wave Filter 81, through numerical-control attenuator 83, the second radio frequency amplifier tube 82 amplifies again, the 3rd Surface Acoustic Wave Filter 81 filtering again, 84 mixing upconvert to the intermediate-freuqncy signal that centre frequency is 70M, bandwidth 24M through frequency mixer with reference local oscillator 827M, amplify by intermediate-frequency tube 85 then to export the 3rd 3dB bridge 313 to.
Claims (10)
1. an indoor signal covering system comprises a micropower signal source, a master unit, reaches at least one far-end unit, it is characterized in that:
This master unit is connected with this far-end unit by the CATV transmission line, and this CATV transmission line is used for transmission signals, and wherein, this signal comprises direct current signal, pilot signal, upward signal, downstream signal and reference local oscillator signal;
This far-end unit comprises:
One loop is used to receive the signal from the CATV transmission line, isolates direct current signal wherein, this direct current signal is handled being this far-end unit power supply, and the residual signal after the output separation;
One minute/mixer, be used to receive the residual signal after the separation of loop output, isolate wherein pilot signal, reference local oscillator signal, upward signal and downstream signal;
One modulation (MODEM) module, be used to receive pilot signal from branch/mixer, this pilot signal handled obtain monitored instruction processing unit to this far-end unit, simultaneously, this MODEM module also is used for the monitored results that this processing unit produces is handled acquisition one monitored results signal;
One reference local oscillator module is used to receive the reference local oscillator signal from branch/mixer, this reference local oscillator signal is handled obtaining a reference local oscillator;
One up radio-frequency module is used to receive the signal from portable terminal, according to the reference local oscillator that the reference local oscillator module produces, this signal is handled the acquisition upward signal; And
One descending radio-frequency module is used to receive the downstream signal from branch/mixer, according to the reference local oscillator that the reference local oscillator module produces, this downstream signal is handled acquisition one radiofrequency signal, and exports this radiofrequency signal by antenna;
Wherein, this branch/mixer also is used for the upward signal of the monitored results signal of MODEM module generation and the generation of up radio-frequency module is synthesized, and exports synthetic signal to the CATV transmission line.
2. indoor signal covering system as claimed in claim 1 is characterized in that, also comprises at least one expanding element, and this expanding element is connected with master unit by optical fiber, is connected with far-end unit by the CATV transmission line.
3. indoor signal covering system as claimed in claim 1, it is characterized in that, this branch/mixer is made of a 3dB bridge, the 2nd 3dB bridge and the 3rd 3dB bridge, wherein a 3dB bridge one end connects loop, the other end connects the 2nd 3dB bridge and the 3rd 3dB bridge, the 2nd 3dB bridge one end connects a 3dB bridge, the other end connects MODEM module and reference local oscillator module, and the 3rd 3dB bridge one end connects up radio-frequency module and downlink radio frequency module.
4. indoor signal covering system as claimed in claim 3, it is characterized in that, this MODEM module comprises a demodulation part and a modulating part, wherein, this demodulation part comprises two-stage Surface Acoustic Wave Filter, intermediate-frequency tube, power detector and high-speed comparator, and the pilot signal that separates from branch/mixer is through dual stage filter, and intermediate-frequency tube amplifies, be input to power detector and transfer aanalogvoltage to, transfer Transistor-Transistor Logic level to and export processing unit to through high-speed comparator again; This modulating part comprises analog switch, intermediate-frequency tube, two-stage Surface Acoustic Wave Filter, Transistor-Transistor Logic level from processing unit realizes that through analog switch the amplitude modulation modulation produces amplitude-modulated signal, and this amplitude-modulated signal exports the 2nd 3dB bridge to through intermediate-frequency tube, two-stage Surface Acoustic Wave Filter.
5. indoor signal covering system as claimed in claim 3, it is characterized in that, this reference local oscillator module comprises first low pass filter, first intermediate-frequency tube, second low pass filter, second intermediate-frequency tube and a PLL phase-locked loop, wherein, this first low pass filter, first intermediate-frequency tube, second low pass filter, second intermediate-frequency tube and PLL phase-locked loop connect by the series connection form.
6. indoor signal covering system as claimed in claim 3, it is characterized in that, this up radio-frequency module comprises low noise amplifier, first Surface Acoustic Wave Filter, the first radio frequency amplifier tube, second Surface Acoustic Wave Filter, numerical-control attenuator, the second radio frequency amplifier tube, the 3rd Surface Acoustic Wave Filter, frequency mixer and intermediate-frequency tube, wherein, signal from portable terminal amplifies through low noise amplifier, then through the first Surface Acoustic Wave Filter filtering, the first radio frequency amplifier tube amplifies, again through second Surface Acoustic Wave Filter, through numerical-control attenuator, the second radio frequency amplifier tube amplifies again, the filtering again of the 3rd Surface Acoustic Wave Filter, upconverting to centre frequency with the mixing of reference local oscillator 827M process frequency mixer is 70M, the intermediate-freuqncy signal of bandwidth 24M exports the 3rd 3dB bridge to by the intermediate-frequency tube amplification then; This downlink radio frequency module comprises first intermediate-frequency tube, intermediate-frequency filter, second intermediate-frequency tube, frequency mixer, first Surface Acoustic Wave Filter, the first radio frequency amplifier tube, numerical-control attenuator, second Surface Acoustic Wave Filter, the second radio frequency amplifier tube and the 3rd radio frequency amplifier tube, wherein, from the downstream signal of branch/mixer through first intermediate-frequency tube, intermediate-frequency filter, amplify through second intermediate-frequency tube again, upconverting to centre frequency with the mixing of reference local oscillator 827M process frequency mixer is 942M, the downlink radio-frequency signal of bandwidth 24M, through the first Surface Acoustic Wave Filter filtering, the first radio frequency amplifier tube amplifies, follow numerical-control attenuator, rising tone table filter filtering exports antenna to through the second radio frequency amplifier tube and the amplification of the 3rd radio frequency amplifier tube at last again.
7. direct amplification machine that is applied in the indoor signal covering system, it is connected with master unit by the CATV transmission line, it is characterized in that this direct amplification machine comprises:
One loop is used to receive the signal from the CATV transmission line, isolates direct current signal wherein, this direct current signal is handled being this direct amplification machine power supply, and the residual signal after the output separation;
One minute/mixer, be used to receive the residual signal after the separation of loop output, isolate wherein pilot signal, reference local oscillator signal, upward signal and downstream signal;
One modulation (MODEM) module, be used to receive pilot signal from branch/mixer, this pilot signal handled obtain monitored instruction processing unit to this direct amplification machine, simultaneously, this MODEM module also is used for the monitored results that this processing unit produces is handled acquisition one monitored results signal;
One reference local oscillator module is used to receive the reference local oscillator signal from branch/mixer, this reference local oscillator signal is handled obtaining a reference local oscillator;
One up radio-frequency module is used to receive the signal from portable terminal, according to the reference local oscillator that the reference local oscillator module produces, this signal is handled the acquisition upward signal; And
One descending radio-frequency module is used to receive the downstream signal from branch/mixer, according to the reference local oscillator that the reference local oscillator module produces, this downstream signal is handled acquisition one radiofrequency signal, and exports this radiofrequency signal by antenna;
Wherein, this branch/mixer also is used for the upward signal of the monitored results signal of MODEM module generation and the generation of up radio-frequency module is synthesized, and exports synthetic signal to the CATV transmission line.
8. the direct amplification machine that is applied in the indoor signal covering system as claimed in claim 7, it is characterized in that, this branch/mixer is made of a 3dB bridge, the 2nd 3dB bridge and the 3rd 3dB bridge, wherein a 3dB bridge one end connects loop, the other end connects the 2nd 3dB bridge and the 3rd 3dB bridge, the 2nd 3dB bridge one end connects a 3dB bridge, the other end connects MODEM module and reference local oscillator module, and the 3rd 3dB bridge one end connects up radio-frequency module and downlink radio frequency module; This MODEM module comprises a demodulation part and a modulating part, wherein, this demodulation part comprises two-stage Surface Acoustic Wave Filter, intermediate-frequency tube, power detector and high-speed comparator, the pilot signal that separates from branch/mixer is through dual stage filter, intermediate-frequency tube amplifies, be input to power detector and transfer aanalogvoltage to, transfer Transistor-Transistor Logic level to and export processing unit to through high-speed comparator again; This modulating part comprises analog switch, intermediate-frequency tube, two-stage Surface Acoustic Wave Filter, Transistor-Transistor Logic level from processing unit realizes that through analog switch the amplitude modulation modulation produces amplitude-modulated signal, and this amplitude-modulated signal exports the 2nd 3dB bridge to through intermediate-frequency tube, two-stage Surface Acoustic Wave Filter.
9. the direct amplification machine that is applied in the indoor signal covering system as claimed in claim 8, it is characterized in that, this reference local oscillator module comprises first low pass filter, first intermediate-frequency tube, second low pass filter, second intermediate-frequency tube and a PLL phase-locked loop, wherein, this first low pass filter, first intermediate-frequency tube, second low pass filter, second intermediate-frequency tube and PLL phase-locked loop connect by the series connection form.
10. the direct amplification machine that is applied in the indoor signal covering system as claimed in claim 8, it is characterized in that, this up radio-frequency module comprises low noise amplifier, first Surface Acoustic Wave Filter, the first radio frequency amplifier tube, second Surface Acoustic Wave Filter, numerical-control attenuator, the second radio frequency amplifier tube, the 3rd Surface Acoustic Wave Filter, frequency mixer and intermediate-frequency tube, wherein, signal from portable terminal amplifies through low noise amplifier, then through the first Surface Acoustic Wave Filter filtering, the first radio frequency amplifier tube amplifies, again through second Surface Acoustic Wave Filter, through numerical-control attenuator, the second radio frequency amplifier tube amplifies again, the filtering again of the 3rd Surface Acoustic Wave Filter, upconverting to centre frequency with the mixing of reference local oscillator 827M process frequency mixer is 70M, the intermediate-freuqncy signal of bandwidth 24M exports the 3rd 3dB bridge to by the intermediate-frequency tube amplification then; This downlink radio frequency module comprises first intermediate-frequency tube, intermediate-frequency filter, second intermediate-frequency tube, frequency mixer, first Surface Acoustic Wave Filter, the first radio frequency amplifier tube, numerical-control attenuator, second Surface Acoustic Wave Filter, the second radio frequency amplifier tube and the 3rd radio frequency amplifier tube, wherein, from the downstream signal of branch/mixer through first intermediate-frequency tube, intermediate-frequency filter, amplify through second intermediate-frequency tube again, upconverting to centre frequency with the mixing of reference local oscillator 827M process frequency mixer is 942M, the downlink radio-frequency signal of bandwidth 24M, through the first Surface Acoustic Wave Filter filtering, the first radio frequency amplifier tube amplifies, follow numerical-control attenuator, rising tone table filter filtering exports antenna to through the second radio frequency amplifier tube and the amplification of the 3rd radio frequency amplifier tube at last again.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201033267U CN201274467Y (en) | 2008-08-08 | 2008-08-08 | Indoor signal coverage system and repeater applied to the system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201033267U CN201274467Y (en) | 2008-08-08 | 2008-08-08 | Indoor signal coverage system and repeater applied to the system |
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| CN201274467Y true CN201274467Y (en) | 2009-07-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333322A (en) * | 2010-11-25 | 2012-01-25 | 深圳市瑞凯德科技有限公司 | Indoor signal covering system |
| CN102842017A (en) * | 2012-07-10 | 2012-12-26 | 深圳市捷顺科技实业股份有限公司 | Method, device and system for expanding reading head |
| CN103428452A (en) * | 2012-05-25 | 2013-12-04 | 张镇非 | Modem of cable television system |
| CN103873807A (en) * | 2012-12-11 | 2014-06-18 | 张镇非 | Indoor splitter of cable TV system |
| CN104660333A (en) * | 2015-01-09 | 2015-05-27 | 泉州市金通光电技术有限公司 | Optical module for sub-covering system of all optical network chamber |
-
2008
- 2008-08-08 CN CNU2008201033267U patent/CN201274467Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333322A (en) * | 2010-11-25 | 2012-01-25 | 深圳市瑞凯德科技有限公司 | Indoor signal covering system |
| CN103428452A (en) * | 2012-05-25 | 2013-12-04 | 张镇非 | Modem of cable television system |
| CN102842017A (en) * | 2012-07-10 | 2012-12-26 | 深圳市捷顺科技实业股份有限公司 | Method, device and system for expanding reading head |
| CN102842017B (en) * | 2012-07-10 | 2015-10-28 | 深圳市捷顺科技实业股份有限公司 | A kind of extended method of read head, device and system |
| CN103873807A (en) * | 2012-12-11 | 2014-06-18 | 张镇非 | Indoor splitter of cable TV system |
| CN104660333A (en) * | 2015-01-09 | 2015-05-27 | 泉州市金通光电技术有限公司 | Optical module for sub-covering system of all optical network chamber |
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