CN2775939Y - Frequency selector for direct sending station of mobile communication - Google Patents
Frequency selector for direct sending station of mobile communication Download PDFInfo
- Publication number
- CN2775939Y CN2775939Y CNU2004201219639U CN200420121963U CN2775939Y CN 2775939 Y CN2775939 Y CN 2775939Y CN U2004201219639 U CNU2004201219639 U CN U2004201219639U CN 200420121963 U CN200420121963 U CN 200420121963U CN 2775939 Y CN2775939 Y CN 2775939Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- frequency
- mobile communication
- selector
- base station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- Y02B60/50—
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The utility model relates to a frequency selector for a direct sending station of mobile communication, which is composed of a box body part and a circuit part according as the frequency selector for a direct sending station of mobile communication provided by the utility model. The box body part comprises a casing, panels, a connector and a radio frequency socket, wherein the connector is arranged in the front end of the casing, and the panels which are divided into an upper panel and a lower panel are arranged on the shell; the circuit part comprises a power circuit, a lower converter circuit, an intermediate frequency filter circuit, an upper converter circuit, a manual gain regulating circuit, a digital control attenuator circuit, an automatic gain control circuit and a local oscillation frequency synthesizer circuit. The utility model adopts a steep passband curve of a surface acoustic wave filter to carry out the filtering of signals so as to reduce the output of interference level, enhance the square ratio of signal quality optimized frequency selector, and enlarge the effective using bandwidth of the frequency selector; thus, the utility model is favorably suitable for practicality.
Description
Technical field
The utility model relates to a kind of frequency-selector, particularly relates to a kind of Mobile communication direct base station frequency-selector that is used for the digital mobile cellular telecommunication field.
Background technology
At present, well-known moving communicating field repeater frequency selector all adopts the through type frequency-selecting.Through type repeater internal structure includes: low noise amplifier, cavity body filter, power amplifier, and connect in turn.The selection of its channel is finished by cavity body filter, the major defect of this frequency-selector circuit structure aspect be with general filter as the frequency-selecting means, thereby below in use existing some problems and defective.
At first, the through type frequency-selector adopts the filtering channel of band general formula cavity body filter as carrier signal, and the passband squareness factor of this filter is bad, the output level that disturbs is suppressed indifferent, also be easier to be subjected to the interference of neighboring trace carrier frequency and influence, cause poor signal quality after the filtering, finally cause in the communication a series of problems such as the clear or transfer of data of aphthenxia is inaccurate; (for example: up in 900MHz public mobile communication net of China Mobile and CHINAUNICOM: 909MHz is descending: 954MHz) for be assigned the adjacent again telecom operators of fixed frequency range, frequency range border by unification of the motherland, both want when guaranteeing smooth communication, can as much as possible effectively utilize the own finite frequency resource that is had again, simultaneously other telecom operators is not constituted interference, adopt the bad cavity body filter of pass-band performance to carry out frequency-selecting and the obvious poor effect of signal filtering.
Secondly, cavity filtering type frequency-selector just carries out simple filtering to selected signal, with regard to practicality, functional also coming with some shortcomings and defective, for example: the through type repeater mainly is by signal is decayed realizing in that attenuator being set between low noise amplifier and the cavity body filter or between cavity body filter and power amplifier to the gain controlling of complete machine.This control mode is general to the control ability of output level, is difficult to accomplish Linear Control.The through type frequency-selector is that cavity body filter itself can not carry out intelligentized control automatically to signal level, the consequence that this defective causes is exactly if the signal level input is unstable, then the frequency-selector output level is also unstable when hanging down when time thes be high, and when output level is too high, after the output level of frequency-selector enters power amplifier, to directly cause the linearity of power amplifier to degenerate, finally cause distorted signals, cause communication quality to can not get guaranteeing, it is also possible that the input and output isolation is not enough because output level is too high, cause the self-excitation of repeater, serious, if incoming level is too high, also might burn power tube.
This shows that above-mentioned existing through type frequency-selector still has many defectives, and demands urgently further being improved.In order to solve the problem that the through type frequency-selector exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Defective in view of above-mentioned existing Mobile communication direct base station frequency-selector existence, the inventor makes rich experience and rich science and technology research and development tackling key problem ability for many years based on being engaged in this type of product design, actively studied innovation, found a kind of Mobile communication direct base station frequency-selector of new structure, can improve existing Mobile communication direct base station frequency-selector, make it have more practicality.Through constantly research, design and pilot sample and after improving, create the utility model that has practical value finally.
Summary of the invention
The purpose of this utility model is, overcome the defective that existing through type frequency-selector exists, and provide a kind of new Mobile communication direct base station frequency-selector, technical problem to be solved is to make its mode that adopts intermediate frequency filtering carry out filtering to signal, utilize the precipitous passband curve of Surface Acoustic Wave Filter that signal is carried out filtering, reduce the output of interference level, improve the squareness factor of signal-quality optimization frequency-selector, make the effective utilized bandwidth of frequency-selector strengthen, thereby be suitable for practicality more.
Another purpose of the present utility model is, a kind of Mobile communication direct base station frequency-selector is provided, technical problem to be solved is to make it adopt automatic gain control circuit (AGC), output level to signal is controlled, and reaches when incoming level changes in certain power bracket, and output level is constant, promptly realize level control, solve the problem of current frequency-selecting module output level fluctuation effectively, also solved the self-excitation problem of repeater simultaneously, thereby be suitable for practicality more.
A purpose more of the present utility model is, a kind of Mobile communication direct base station frequency-selector is provided, technical problem to be solved is to make it when having automatic gain control function, also have manual gain adjustments (MGC) and digital control attenuator (DGC), the overall gain of control repeater complete machine that can be easily and effectively, thereby make the Gain Adjustable scope of repeater bigger, be beneficial to that the repeater complete machine is more convenient to satisfy different gain requirements neatly, thereby be suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of Mobile communication direct base station frequency-selector according to the present invention proposes is made of box portion and circuit part's branch, and this box portion includes: housing, connector, radio frequency socket, and connector and radio frequency socket are installed on the housing; This circuit part includes: power circuit, lower frequency changer circuit, intermediate frequency filtering circuit, up-converter circuit, manual gain adjustments circuit, wherein, power circuit is powered to entire circuit, and lower frequency changer circuit, intermediate frequency filtering circuit, up-converter circuit, manual gain adjustments circuit connect in turn.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid Mobile communication direct base station frequency-selector, wherein said intermediate frequency filtering circuit includes Surface Acoustic Wave Filter.
Aforesaid Mobile communication direct base station frequency-selector, the frequency filter circuit of wherein said circuit part utilizes Surface Acoustic Wave Filter that selected frequencies is carried out filtering; Adopt the local oscillation frequency combiner circuit to choose carrier frequency to differ the local oscillation signal of an intermediate frequency simultaneously to produce a ratio, this local frequency can control by the data flow that program is sent, the corresponding IF-FRE of channel number, also corresponding simultaneously channel frequency; Have upper and lower frequency changer circuit simultaneously, be used for the channel frequency that recovers to choose and produce intermediate-freuqncy signal respectively.
Aforesaid Mobile communication direct base station frequency-selector, wherein said circuit part includes the local oscillation frequency combiner circuit, in the time of upper and lower frequency changer circuit, also has the manual gain adjustments circuit, can control self gaining of frequency-selector effectively, be convenient to complete machine and use and transfer survey.
Aforesaid Mobile communication direct base station frequency-selector, wherein said circuit part has the intermediate frequency filtering circuit, the local oscillation frequency combiner circuit, upper and lower frequency changer circuit, in the time of the manual gain adjustments circuit, also have digital control attenuator circuit, can control attenuation, can control the gain of complete machine more easily by program.
Aforesaid Mobile communication direct base station frequency-selector, wherein said circuit part has the intermediate frequency filtering circuit, the local oscillation frequency combiner circuit, upper and lower frequency changer circuit, in the time of manual gain adjustments circuit, digital control attenuator circuit, also has automatic gain control circuit, this control circuit can solve the defective of through type frequency-selector output level shakiness, can solve repeater complete machine self-excitation problem effectively.
Aforesaid Mobile communication direct base station frequency-selector, wherein said circuit part has the intermediate frequency filtering circuit, in the time of local oscillation frequency combiner circuit, upper and lower frequency changer circuit, also has automatic gain control circuit.
Aforesaid Mobile communication direct base station frequency-selector, wherein said connector, radio frequency socket be not in the same side of housing; The position of manual gain adjustments circuit and digital control attenuator circuit is transferred and is exchanged.
Aforesaid Mobile communication direct base station frequency-selector, two these vibration plates of wherein said employing, i.e. mutually independently two local oscillation frequency combiner circuits and a frequency conversion plate forming circuit part that includes upper and lower frequency changer circuit.
According to the Mobile communication direct base station frequency-selector that the utility model proposes, it is made of box portion and circuit part.This box portion includes: housing, panel, connector, radio frequency socket, connector are at the front end of housing, and panel is installed on the housing, divide two panels up and down; This circuit part by: power circuit, lower frequency changer circuit, intermediate frequency filtering circuit, up-converter circuit, manual gain adjustments circuit (MGC), digital control attenuator circuit (DGC), automatic gain control circuit (AGC), local oscillation frequency condensating synthesizering circuit: wherein power circuit is powered to entire circuit, lower frequency changer circuit, intermediate frequency filtering circuit, up-converter circuit, manual gain adjustments circuit, digital control attenuator circuit, automatic gain control circuit, connection in turn, the local oscillation frequency condensating synthesizering circuit is connected with last lower frequency changer circuit.
The purpose of this utility model and solve its technical problem and can also be applied to the following technical measures to achieve further.
Aforesaid Mobile communication direct base station frequency-selector, wherein said radio frequency socket is installed on the housing, and connector is installed on the housing, and wherein radio frequency socket is positioned at the left and right sides of connector, and two of panels are installed in the upper and lower surface of housing.
Aforesaid Mobile communication direct base station frequency-selector, wherein said power circuit is connected and composed successively by capacitor C 37, regulator block N10, capacitor C 38, capacitor C 39, is inserted by 12V, powers to entire circuit through Voltage stabilizing module N10 output 5V voltage.
Aforesaid Mobile communication direct base station frequency-selector, the local frequency mixing mutually that wherein said lower frequency changer circuit is produced input signal and local oscillation frequency synthesizer by MX1, output intermediate-freuqncy signal.
Aforesaid Mobile communication direct base station frequency-selector, wherein said intermediate frequency filtering circuit is connected successively by low pass filter F2, capacitor C 16, amplifier N2, capacitor C 17, Surface Acoustic Wave Filter F3, capacitor C 18, amplifier N3, capacitor C 19, mainly finishes by the intermediate frequency filtering circuit to the filtering of signal and to the inhibition of interference level and the qualification of signal bandwidth.
Aforesaid Mobile communication direct base station frequency-selector, the local frequency mixing mutually that wherein said up-converter circuit is produced intermediate frequency and local oscillation frequency synthesizer by MX2, restoring signal frequency.
Aforesaid Mobile communication direct base station frequency-selector, wherein said manual gain adjustments circuit (MGC) by electrically controlled attenuator R7 through C13 filtering connecting resistance R8 through inductance L6, L7 be connected on the attenuator N16, can be by regulating electrically controlled attenuator R7, make attenuator N6 that signal is decayed, reduce gain thereby reach, thereby control the purpose of whole frequency-selector output level.Also can realize by other model circuit.
Aforesaid Mobile communication direct base station frequency-selector, wherein said digital control attenuator circuit (DGC) connects attenuator D1 by inverter D2 through capacitor C 24, C25, C26, C27, C28 and constitutes, and also can be realized by other model circuit.
Aforesaid Mobile communication direct base station frequency-selector, wherein said automatic gain control circuit (AGC) is linked to each other with operational amplifier N9 through resistance R 10 detections by wave detector N8, connects attenuator N1 again and constitutes.
Aforesaid Mobile communication direct base station frequency-selector, wherein said local oscillation frequency condensating synthesizering circuit connects the output local frequency by phase discriminator D1, crystal oscillator N11, voltage controlled oscillator N12, amplify local oscillation signal after splitter N14 is divided into two-way respectively through N15, N16 amplification by amplifier N13, provide the two-way local oscillator to last low-converter.Also can realize by other model circuit.
From the above, the utility model Mobile communication direct base station frequency-selector is made up of circuit and structure two parts, and this box portion has: housing, panel, connector, radio frequency socket; This circuit part has: power circuit, lower frequency changer circuit, intermediate frequency filtering circuit, up-converter circuit, manual gain adjustments circuit (MGC), digital control attenuator circuit (DGC), automatic gain control circuit (AGC), local oscillation frequency condensating synthesizering circuit; The utility model selecting frequency characteristic is better, and channel is selected more convenient, thereby is suitable for practicality more.
In view of technique scheme, channel selecting type frequency-selector is compared with the through type repeater frequency selector, has increased upper and lower frequency changer circuit, frequency synthesizer circuit, manual gain adjustments circuit (MGC), digital control attenuator circuit (DGC), automatic gain control circuit (AGC); Performance is more perfect, and is with better function.
By technique scheme, the utility model has following advantage at least:
1, the utility model repeater frequency selector employing intermediate frequency selecting type is the channel selecting type, by the selecting frequency characteristic curve preferably Surface Acoustic Wave Filter carry out filtering, the output level that has reduced interference signal is promptly better to the inhibition of interference signal, thereby make that filter effect through type frequency-selector filter effect than before is better, guaranteed the delivery quality of signal; The spectral characteristic curved edge is more precipitous, makes adjacent channel can not produce mutually because of the problem of passband and disturb that telecom operators can more effectively utilize limited frequency resource.
2, adopt manual gain adjustments circuit (MGC), the output gain of the whole frequency-selector of more convenient adjustment; Adopt digital control attenuator circuit (DGC), the gain of complete machine is adjusted in more convenient repeater, makes repeater Gain Adjustable scope bigger, thereby makes the repeater can satisfy the different gains requirement, and range of application is wider.
3, adopt automatic gain control circuit (AGC), can AGC be started to control by adjusting, when the incoming level of channel selector fluctuateed within the specific limits, through AGC control, the incoming level of its late-class circuit remains unchanged, and made the good linearity of channel frequency-selector; The output level that has also guaranteed simultaneously frequency-selector is that the incoming level of power amplifier is stable, has solved the self-excitation problem because of the too high generation of output level, makes power amplifier more stably be operated in linear condition, the signal fidelity, and communication quality is good.
4, adopt the local oscillation frequency condensating synthesizering circuit, being chosen in here of channel finished.Can select local frequency by control circuit, i.e. corresponding channel frequency of channel number, simultaneously also corresponding one and signal frequency differ from the frequency synthesizer frequency of an intermediate frequency, when changing channel number by control circuit, program control its send a data flow with the frequency preset of frequency synthesizer to and signal frequency differ from the frequency of an intermediate frequency, i.e. local frequency; From the above, adopting the local oscillation frequency condensating synthesizering circuit is to finish the core circuit that channel is selected, and makes the selection of channel more convenient by changing the frequency synthesizer frequency, accurate.
In sum, the Mobile communication direct base station frequency-selector of the utility model special construction, it has above-mentioned many advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and more existing through type frequency-selector has the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of specification, below with preferred embodiment of the present utility model and conjunction with figs. describe in detail as after.
Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model Mobile communication direct base station frequency-selector.
Fig. 2 is the box body structure schematic diagram of the utility model Mobile communication direct base station frequency-selector.
Fig. 3 is the frequency changer circuit schematic diagram of the utility model Mobile communication direct base station frequency-selector.
Fig. 4 is the local oscillation frequency condensating synthesizering circuit schematic diagram of the utility model Mobile communication direct base station frequency-selector.
Fig. 5 is the board structure of circuit schematic diagram of the utility model Mobile communication direct base station frequency-selector.
1: housing 2: panel
3: connector 4: radio frequency socket
5: lower frequency changer circuit 6: the intermediate frequency filtering circuit
7: up-converter circuit 8: manual gain adjustments circuit (MGC)
9: digital control attenuator circuit (DGC) 10: automatic gain control circuit (AGC)
11: power circuit 12: the local oscillation frequency condensating synthesizering circuit
A: frequency conversion plate B: this vibration plate
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to its embodiment of Mobile communication direct base station frequency-selector, structure, feature and the effect thereof that the utility model proposes, describe in detail as after.
See also shown in Figure 1, it is the theory diagram of the utility model Mobile communication direct base station frequency-selector, power circuit 11 is powered to entire circuit in this circuit, lower frequency changer circuit 5, intermediate frequency filtering circuit 6, up-converter circuit 7, manual gain adjustments circuit 8, digital control attenuator circuit 9 connect successively, automatic gain control circuit 10 two ends are connected with lower frequency changer circuit 5 with digital control attenuator circuit 9 respectively, and local oscillation frequency condensating synthesizering circuit 12 is connected with up-converter circuit 7 with lower frequency changer circuit 5.
See also shown in Figure 2, be the box body structure figure of the utility model Mobile communication direct base station frequency-selector, this box portion includes housing 1, panel 2, connector 3, radio frequency socket 4 formations, wherein panel 2 is installed on the housing 1, connector 3 is installed in the side with the perpendicular housing 1 in panel 2 surface, radio frequency socket 4 is installed in a side of the housing 1 of connector 3, and two radio frequency sockets 4 are divided in two ends, connector 3 left and right sides; Above-mentioned only is preferred embodiment, and wherein radio frequency socket 4 is not unique with the position relation of connector 3, and other distribution line also can be arranged.
See also shown in Figure 3, be the utility model Mobile communication direct base station frequency-selector frequency changer circuit schematic diagram, in Fig. 3, in the power circuit 3, direct current+12V crosses capacitor C 37 backs and is connected with Voltage stabilizing module N10, and output+5V voltage was powered to entire circuit after N10 met two direct-to-ground capacitance C8, C9.
Lower frequency changer circuit 5 is made of integrated circuit modules MX1, and MX1 subtracts each other frequency input signal and local frequency, produces intermediate-freuqncy signal.
Intermediate frequency filtering circuit 6 is linked in sequence successively by low pass filter F2, capacitor C 16, amplifier N1, capacitor C 17, Surface Acoustic Wave Filter F3 and constitutes.Wherein low pass filter also can be by other models or active or passive circuit form realization.
Up-converter circuit 7 is made of integrated circuit modules MX2, and MX2 reverts to input signal with intermediate-freuqncy signal and local frequency addition.
Manual gain adjustments circuit (MGC) 8 is connected on the attenuator N16 through inductance and L6, L7 through C13 filtering connecting resistance R8 by electrically controlled attenuator R7, can be by regulating electrically controlled attenuator R7, make attenuator N6 that signal is decayed, reduce gain thereby reach, thereby control the purpose of whole frequency-selector output level.
Digital control attenuator circuit (DGC) 9 connects attenuator D1 by operational amplifier D2 through capacitor C 24, C25, C26, C27, C28 and constitutes; Attenuator D1 is an integrated circuit.
Automatic gain control circuit (AGC) is linked to each other with operational amplifier N9 through resistance R 10 detections by wave detector N8, connects attenuator N1 again and constitutes.The main automatic control that realizes the frequency-selector output level makes it can stablize output.
Seeing also shown in Figure 4ly, is the utility model Mobile communication direct base station frequency-selector local oscillation frequency condensating synthesizering circuit figure.It connects the output local frequency by phase discriminator D1, crystal oscillator N11, voltage controlled oscillator N12, amplifies local oscillation signal after splitter N14 is divided into two-way respectively through N15, N16 amplification by amplifier N13, provides the two-way local oscillator to last low-converter.Wherein phase discriminator D1, crystal oscillator N11, voltage controlled oscillator N12 also can be realized by other form circuit.
See also shown in Figure 5, be the utility model Mobile communication direct base station frequency-selector board structure of circuit figure, two circuit boards are housed in the housing 1, circuit board adopts polylith partial installation formula structure, circuit part is installed on circuit board, and two circuit boards are respectively: frequency conversion plate A and this vibration plate B.This vibration plate B is positioned at the bottom of housing, and is positive towards panel; Frequency conversion plate A be layered in this vibration plate above.Above-mentioned only is the preferred embodiment of board structure of circuit, wherein the position of frequency conversion plate A and this vibration plate B relation is not unique, and other distribution line example also can be arranged: frequency conversion plate A and this vibration plate B are fixed on the same aspect of housing promptly at this moment frequency conversion plate A and this vibration plate B towards same face version.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not to be used to limit the utility model, any those skilled in the art, in the scope that does not break away from technical solutions of the utility model, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solutions of the utility model content, foundation technical spirit of the present utility model is to above any simple modification that embodiment did, equivalent variations and modification, current at the integrated circuit industry high speed development particularly, the function of several integrated circuits is integrated in the integrated circuit has become very usual thing, can realize with a kind of integrated circuit of function multiple model being arranged also, be to any simple modification that above embodiment did (for example practical major function is identical and integrated circuit that model is different) in every case according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (8)
1, a kind of Mobile communication direct base station frequency-selector is made of box portion and circuit part's branch, it is characterized in that:
This box portion includes: housing, connector, radio frequency socket, and connector and radio frequency socket are installed on the housing;
This circuit part includes: power circuit, lower frequency changer circuit, intermediate frequency filtering circuit, up-converter circuit, manual gain adjustments circuit, wherein, power circuit is powered to entire circuit, and lower frequency changer circuit, intermediate frequency filtering circuit, up-converter circuit, manual gain adjustments circuit connect in turn.
2, Mobile communication direct base station frequency-selector according to claim 1 is characterized in that wherein said intermediate frequency filtering circuit includes Surface Acoustic Wave Filter.
3, Mobile communication direct base station frequency-selector according to claim 1 is characterized in that wherein said circuit part also includes the local oscillation frequency combiner circuit, and the local oscillation frequency condensating synthesizering circuit is connected with last lower frequency changer circuit.
4, Mobile communication direct base station frequency-selector according to claim 1 is characterized in that wherein said circuit part also includes digital control attenuator circuit, and this digital control attenuator circuit is connected in the manual gain adjustments circuit.
5, Mobile communication direct base station frequency-selector according to claim 4 is characterized in that wherein said circuit part also includes automatic gain control circuit, and this automatic gain control circuit is connected in digital control attenuator circuit.
6,, it is characterized in that exchange is transferred in the position of wherein said manual gain adjustments circuit and digital control attenuator circuit according to claim 4 or 5 described Mobile communication direct base station frequency-selectors.
7, according to the described Mobile communication direct base station frequency-selector of the arbitrary claim of claim 1～5, it is characterized in that wherein said circuit part adopts two these vibration plates, i.e. independently two local oscillation frequency combiner circuits and a frequency conversion plate forming circuit part that includes upper and lower frequency changer circuit mutually.
8, according to the described Mobile communication direct base station frequency-selector of the arbitrary claim of claim 1～5, it is characterized in that wherein said box portion also includes panel, this panel is arranged at the front portion of housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004201219639U CN2775939Y (en) | 2004-12-23 | 2004-12-23 | Frequency selector for direct sending station of mobile communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004201219639U CN2775939Y (en) | 2004-12-23 | 2004-12-23 | Frequency selector for direct sending station of mobile communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2775939Y true CN2775939Y (en) | 2006-04-26 |
Family
ID=36750254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004201219639U Expired - Fee Related CN2775939Y (en) | 2004-12-23 | 2004-12-23 | Frequency selector for direct sending station of mobile communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2775939Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335730B (en) * | 2008-08-01 | 2011-05-11 | 京信通信系统（中国）有限公司 | Single channel digital frequency selection system with input and output on same frequency and implementing method thereof |
| CN102361463A (en) * | 2011-05-27 | 2012-02-22 | 福建三元达通讯股份有限公司 | Radio frequency (RF) band selector |
| CN101207430B (en) * | 2006-12-21 | 2012-05-23 | 京信通信技术(广州)有限公司 | Anti-self excitation module of straight amplification station system |
| CN106301640A (en) * | 2016-08-16 | 2017-01-04 | 深圳市航盛电子股份有限公司 | A kind of MCVF multichannel voice frequency transmission method based on FM modulation frequency mixing technique |
-
2004
- 2004-12-23 CN CNU2004201219639U patent/CN2775939Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207430B (en) * | 2006-12-21 | 2012-05-23 | 京信通信技术(广州)有限公司 | Anti-self excitation module of straight amplification station system |
| CN101335730B (en) * | 2008-08-01 | 2011-05-11 | 京信通信系统（中国）有限公司 | Single channel digital frequency selection system with input and output on same frequency and implementing method thereof |
| CN102361463A (en) * | 2011-05-27 | 2012-02-22 | 福建三元达通讯股份有限公司 | Radio frequency (RF) band selector |
| CN102361463B (en) * | 2011-05-27 | 2014-11-19 | 福建三元达通讯股份有限公司 | Radio frequency (RF) band selector |
| CN106301640A (en) * | 2016-08-16 | 2017-01-04 | 深圳市航盛电子股份有限公司 | A kind of MCVF multichannel voice frequency transmission method based on FM modulation frequency mixing technique |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1257623A (en) | Multi-carrier radio system and radio transceiver implementation | |
| CN1868133A (en) | System and method for filtering signals in a transceiver | |
| CN1574675A (en) | Time-division-duplexing type power amplification module | |
| CN1282140A (en) | Load envelope following amplifier system | |
| CN1930786A (en) | Receiving circuit, and receiving apparatus and transmitting/receiving apparatus using the receiving circuit | |
| CN101232744A (en) | Method and device for multi sound source sharing audio power amplifier | |
| CN101047408A (en) | Digital radio microphone system | |
| CN2775939Y (en) | Frequency selector for direct sending station of mobile communication | |
| CN1147177C (en) | Method and apparatus for raising carrier output power of wide band multi-carrier base station | |
| CN102137316B (en) | Digital high-definition multichannel microphone system | |
| CN1210875C (en) | Wave mixing device | |
| CN202183773U (en) | Vehicle-mounted system | |
| CN1780158A (en) | 2-carrier receiving module and multiple-carrier base station receiver | |
| CN1567807A (en) | A frequency domain filter and method for implementing frequency domain filter | |
| CN102882610B (en) | The method of onboard system and elimination interference tones thereof | |
| CN208509230U (en) | A kind of sound system | |
| CN101399794B (en) | Reference clock generating method and device for supporting multi-transceiving system | |
| CN210247068U (en) | Device for manually switching designated wireless channel through external knob | |
| WO2016086384A1 (en) | Signal processing circuit | |
| CN203368485U (en) | Short-wave four-channel photoelectric conversion interface unit | |
| CN1246973C (en) | Rceiver with direct conversion between time division in-phase channel and orthogonal channel and method thereof | |
| CN2877147Y (en) | Apparatus for converting VF signal into FM signal of cell phone | |
| CN202059560U (en) | Microphone device | |
| CN204836149U (en) | Shortwave four -channel narrow -band receiver | |
| CN102543093A (en) | Microphone device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060426 Termination date: 20101223 |