CN202475433U - Remote system for optical repeater station of FM broadcasting - Google Patents
Remote system for optical repeater station of FM broadcasting Download PDFInfo
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- CN202475433U CN202475433U CN2012200378651U CN201220037865U CN202475433U CN 202475433 U CN202475433 U CN 202475433U CN 2012200378651 U CN2012200378651 U CN 2012200378651U CN 201220037865 U CN201220037865 U CN 201220037865U CN 202475433 U CN202475433 U CN 202475433U
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Abstract
The utility model provides a remote system for an optical repeater station of FM broadcasting, comprising a receiving antenna, a local receiver, optical cables, remote receivers and an emission antenna. Light signals output by the local receiver are transmitted to a plurality of remote receivers in a long distance by the optical cables. The local receiver comprises a low-noise filter amplifier, an electric-light conversion module, a light-way divider, a modem, a local CPU and a switching power supply and is used for carrying out filtering amplification of input FM signals and modulating to light signals. The remote receiver includes an photoelectric conversion module, a driving and interface, a power amplifier, a remote CPU and a power supply. The remote receivers are used for converting light signals to RF signals and carrying out power amplification and signals are emitted by the emission antenna. The remote system for an optical repeater station of FM broadcasting provided by the utility model has the advantages in that the system not only keeps the function of the repeater station of FM broadcasting, but also raises isolation between receiving and emitting of the repeater station of FM broadcasting effectively. In engineering practical applications of signal covering, the local receiver can tow a plurality of remote receivers by the light-way divider and the problem of multipoint covering can be solved.
Description
Technical field
The utility model relates to fm broadcast signal and zooms out the repeater system of platform remote termination at the most through near-end machine and Optical Fiber Transmission, mainly is a kind of FM broadcasting optical fiber repeater far-drawing system.
Background technology
FM broadcasting power intensifier system in the past; It is the FM broadcasting repeater; It is actually a uni-directional wireless amplifier; Receiving and transmitting signal is accomplished on same body, improves its limited isolation through direction and the angle of adjusting dual-mode antenna, to reach the purpose that fm broadcast signal covers in a certain blind area.
The main application of FM broadcasting repeater is the blind area that covers fm broadcast signal at present, and its reception antenna and transmitting antenna are contained on the body of repeater, so isolation is limited between the signal transmitting and receiving simultaneously; If isolation is relatively poor; Make the mutual interference of receiving and transmitting signal phase; Be easy to generate self-excitation, make that the repeater is difficult to play the real effect that covers signal blind zone, so the good degree of repeater plays very important effect to the covering of signal network in the engineering construction of fm broadcast signal nerve of a covering.And the FM broadcasting optical fiber repeater far-drawing system of this patent can make the distance of drawing back between near-end machine and the remote termination more than 5 kilometers realize isolation preferably.The utility model obviously improves the isolation of FM broadcasting repeater in the past; The FM broadcasting optical fiber repeater of the utility model is to utilize the directivity reception antenna that fm broadcast signal is received the near-end machine, and the frequency-modulation broadcasting signal carries out filtering and amplifies, and carries out electricity/light conversion through optical module; The output light modulating signal; Be transferred to remote termination to light modulating signal through optical cable again, remote termination is received module through light and is carried out the conversion of light/electricity, be demodulated to radiofrequency signal after; Send into radio frequency unit through band-pass filter and carry out power amplification, arriving with the directivity transmission antennas transmit needs region covered again.Because (equaling the Optical Fiber Transmission distance) is far for the distance between FM broadcasting optical fiber repeater far-drawing system reception antenna and the transmitting antenna, more than at least five kilometers, so isolation can be done fairly goodly.So not only solve the isolation problem, but and omnidirectional's covering.So addressing is flexible, and the signal transmission is not limited by geographical conditions, is adapted to interior, the with a varied topography signal blind zones such as mountain area of reinforcing bar sealing building especially.
The utility model content
The utility model has solved above-mentioned isolation technical problem, and a kind of FM broadcasting optical fiber repeater far-drawing system is provided, and this system not only keeps the function of FM broadcasting repeater, and has improved isolation between the transmitting-receiving of FM broadcasting repeater effectively; In the engineering practical application that covers signal, the near-end machine can pass through a plurality of remote terminations of optical branching device traction, can solve the multiple spot covering problem.
The utility model solves the technical scheme that its technical problem adopts: this FM broadcasting optical fiber repeater far-drawing system; Mainly comprise reception antenna, near-end machine, optical cable, remote termination and transmitting antenna, the light signal of near-end machine output is given a plurality of remote terminations through the long Distance Transmission of optical cable; Wherein reception antenna is used to receive the fm broadcast signal from the main transmitter; The near-end machine mainly comprises low noise filter amplifier, electrooptic conversion module, optical branching device, modulator-demodulator, near-end central processing unit and Switching Power Supply, is used for the input FM signal is carried out being modulated into light signal after filtering is amplified; The near-end central processing unit is used for the management and the control of each module data parameter of near-end machine; Modulator-demodulator is used for the remote monitoring of near-end machine; Remote termination; Form by photoelectric conversion module, driving and interface, power amplifier, distal center processor and power supply; Its radio frequency link is to be used for converting light signal to radiofrequency signal; Carry out power amplification then,, finally export enough power signals and go out by transmission antennas transmit comprising power amplifier drive circuit and radio frequency parameter testing circuit; Transmitting antenna is used for fm broadcast signal and transmits, with the coverage goal zone.
After the low noise filter amplifier amplified the input FM signal in the described near-end machine, its output power levels reached the requirement of the input power levels of electrooptic conversion module; Electrooptic conversion module through after the light modulation, zooms out each remote termination to FM signal through optical branching device and optical cable transmission; The distance that zooms out is generally more than 5 kilometers, and the number of traction remote termination will be decided according to luminous power size, optical branching device decay and the optical cable decay of electrooptic conversion module emission.
Said distal center processor is used for the management and the control of each module data parameter of remote termination; And give Optical Receivers these data parameters and carry out rf modulations and light modulation; Be transferred to the near-end machine through optical link then, through near-end machine modulator-demodulator GPRS function monitor remote termination.
The effect that the utility model is useful is: the FM broadcasting optical fiber repeater far-drawing system that the utility model relates to has following characteristics in the field: 1, this far-drawing system can cover transmitting station institute can not region covered; Particularly use this repeater to carry out signal in mountainous terrain or the reinforcing bar sealing building and cover effective, small investment.2, can be according to network coverage needs, the near-end machine is the several remote termination work of traction simultaneously, so use very flexible.3, along with the tremendous development of optical fiber transmission technique in recent years, the optical fiber transponder can be accomplished stable performance, and each item index can satisfy the requirement of fm broadcast signal transmission specification, and has the GPRS remote monitoring function, can really realize unattended operation.4, this system adopts novel circuit structure (like the ARM chip that adopts 32 bit CPUs etc.) on principle, FM broadcasting forwarding capability before inheriting, and distance near, remote termination zooms out isolation is greatly improved.5, the near-end machine adopts identical open-air type sealing cast aluminium structure with the remote termination shell, suitable being installed on (electric wire) bar or the wall, and installation and maintenance is all very convenient.
Description of drawings
Fig. 1 is the theory diagram of the utility model;
Fig. 2 is a near-end machine theory diagram in the utility model;
Fig. 3 is a remote termination theory diagram in the utility model;
Fig. 4 is the low noise filter amplifier circuit diagram in the utility model near-end machine;
Fig. 5 is the low noise filter amplifier interface circuit figure in the utility model near-end machine;
Fig. 6 is that the utility model is near, distal center processor circuit figure;
Fig. 7 is the modem circuit figure in the utility model near-end machine;
Fig. 8 is the drive circuit figure in the utility model remote termination;
Fig. 9 is the interface circuit figure of the driving in the utility model remote termination;
Figure 10 is power amplifier figure in the utility model remote termination;
Figure 11 is the interface circuit figure of power amplifier in the utility model remote termination;
Figure 12 is the utility model near-end machine winding diagram;
Figure 13 is the utility model remote termination winding diagram.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, below in conjunction with accompanying drawing and for example, the utility model is further elaborated.Should be appreciated that described hereinly, and be not used in qualification the utility model for example only in order to explaining the utility model.
The utility model relates to fm broadcast signal and zooms out the repeater system of platform remote termination at the most through near-end machine and Optical Fiber Transmission, and it mainly forms (seeing Fig. 1 block diagram) by reception antenna, near-end machine, optical fiber (multichannel), many remote terminations and respective transmit antenna.
Its theory diagram of near-end machine is as shown in Figure 2, and it mainly is made up of low noise filter amplifier, electrooptic conversion module, optical branching device, modulator-demodulator, near-end central processing unit and Switching Power Supply.Its main task is fm broadcast signal to be amplified through filtering be modulated into light signal, is transferred to many remote terminations through multi-channel optical fibre again, just accomplishes the electric light convert task.The enforcement circuit of low noise filter amplifier such as Fig. 4, shown in Figure 5, Fig. 4 are the low noise filter amplification circuit, and Fig. 5 is its monitor-interface circuit, and they form low noise filter amplifier module whole circuit.Its input 1U1 is a first order amplifier, requires low noise to amplify, and guarantees that whole module noise factor reaches≤designing requirement of 3dB; 1U2 and 1U4 are two 30dB numerical-control attenuators, and it is big or small required to regulate gain for whole system; 1U3,1U5 are that second and third level is amplified, and to remedy the gain reduction of numerical-control attenuator, reach the enough incoming levels of next stage; 1F1 is the 20MHz sound watchband bandpass filter of 87MHz～107MHz frequency range, and 1U6,1U7 are fourth, fifth grade of amplification, to remedy the gain reduction of watchband bandpass filter; 1D1 is that the Pin pipe is formed radio frequency attenuator with its peripheral circuit; Close detector through the signal lotus root of 1R29.1R30.1R31 resistor network to 1U11; Compare amplitude limit through the 1U10 amplifier, the attenuation that it exports the radio frequency attenuator of directly controlling compositions such as 1D1 plays the effect of AGC amplitude limit.Fig. 5 is the interface circuit figure of low noise filter amplifier.U7 is a CPU single-chip microcomputer, and it has 8 analog-to-digital conversion I/O mouths, the high and low cost of integrated level, speed fast (time for each instruction 6 times to standard 8051 devices).U10 is the E2PRON device, cooperates U7 storage data.U9 is used for digital-to-analogue conversion, and the voltage that starts to control of automatic gain control can be set at this output voltage.U5 is used for 485 interfaces changes 232.U1 and U2 are the MOS switches, and directly switch road DC power supply can be controlled by single-chip microcomputer.
Fig. 6 is the circuit diagram of central processing unit ARM plate.Whole reception, storage and the related operation that carries out data around 32 little process chip U1 through software.Data from optical module interface, local serial ports and MODEM (modulator-demodulator) interface are carried out level conversion through U3, U4; Equally the external data signal from J23, J24 socket changes 232 backs and carries out exchanges data and communicate by letter with the U1 single-chip microcomputer through U18, U19 integrated circuit 485, with the telemanagement of projects such as the network control of realization near-end machine or remote termination and inquiry.This ARM has serial ports expansion (U6) function and ethernet communication function (U5).The connector (U11) that possesses the I2C bus simultaneously is to adapt to the connection of various interface.
Fig. 7 is modem circuit figure, and it must insert MODEM and could work, and J5 is the connection socket of cat; U1 is used for level match, and U3 is the mains switch of MODEM, can be controlled by single-chip microcomputer.
Fig. 8 is the power amplifier drive circuit figure in the remote termination, and it mainly acts on is that FM signal with opto-electronic conversion amplifies, to reach the power amplifier that enough power outputs drive the back level.1U1 is for drive amplifying, and the AGC attenuator that its input has been connected and has been made up of 1D1 etc. is with realization remote termination output violent change.
Fig. 9 is the driving interface circuit, and its operation principle and Fig. 5 are basic identical.
Figure 10 is net work discharge road; In view of structure; It is made up of two PCB3dB coupling apparatus of two LDMOS (Q1, Q2) power tube and front and back; Form typical balance structure for amplifying, the multistage lc circuit before and after Q1, the Q2 power tube plays the matched filtering effect, to realize FM frequency range (87MHz～107MHz) power amplification.
Figure 11 is a remote termination power amplifier output circuit, and 3ISO1 is the output isolator, plays the effect that reflection power is isolated; What before isolator, be connected in series is the PCB coupling apparatus, and its lotus root is right to be 35dB, for 3U1,3U2 chip provide detection signal, to realize power output AGC amplitude limit.
Figure 12 is a near-end machine winding diagram, and it has specifically reflected the annexation of holding wire, data wire and the power line between each module in the near-end machine; See following connection table 1 for details.
Table 1
Figure 13 is the remote termination winding diagram.It has specifically reflected the annexation of the holding wire between each module, data wire and power line in the remote termination; See following connection table 2 for details.
Table 2
It is understandable that, for a person skilled in the art, the technical scheme of the utility model and utility model design are equal to replacement or change the protection range that all should belong to the appended claim of the utility model.
Claims (3)
1. FM broadcasting optical fiber repeater far-drawing system is characterized in that: mainly comprise reception antenna, near-end machine, optical cable, remote termination and transmitting antenna, the light signal of near-end machine output is given a plurality of remote terminations through the long Distance Transmission of optical cable; Wherein reception antenna is used to receive the fm broadcast signal from the main transmitter; The near-end machine mainly comprises low noise filter amplifier, electrooptic conversion module, optical branching device, modulator-demodulator, near-end central processing unit and Switching Power Supply, is used for the input FM signal is carried out being modulated into light signal after filtering is amplified; The near-end central processing unit is used for the management and the control of each module data parameter of near-end machine; Modulator-demodulator is used for the remote monitoring of near-end machine; Remote termination; Form by photoelectric conversion module, driving and interface, power amplifier, distal center processor and power supply; Its radio frequency link is to be used for converting light signal to radiofrequency signal; Carry out power amplification then,, finally export enough power signals and go out by transmission antennas transmit comprising power amplifier drive circuit and radio frequency parameter testing circuit; Transmitting antenna is used for fm broadcast signal and transmits, with the coverage goal zone.
2. FM broadcasting optical fiber repeater far-drawing system according to claim 1; It is characterized in that: after the low noise filter amplifier amplified the input FM signal in the described near-end machine, its output power levels reached the requirement of the input power levels of electrooptic conversion module; Electrooptic conversion module through after the light modulation, zooms out each remote termination to FM signal through optical branching device and optical cable transmission; The distance that zooms out is more than 5 kilometers, and the number of traction remote termination will be decided according to luminous power size, optical branching device decay and the optical cable decay of electrooptic conversion module emission.
3. FM broadcasting optical fiber repeater far-drawing system according to claim 1; It is characterized in that: said distal center processor is used for the management and the control of each module data parameter of remote termination; And give Optical Receivers these data parameters and carry out rf modulations and light modulation; Be transferred to the near-end machine through optical link then, through near-end machine modulator-demodulator GPRS function monitor remote termination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200378651U CN202475433U (en) | 2012-02-07 | 2012-02-07 | Remote system for optical repeater station of FM broadcasting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200378651U CN202475433U (en) | 2012-02-07 | 2012-02-07 | Remote system for optical repeater station of FM broadcasting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202475433U true CN202475433U (en) | 2012-10-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200378651U Expired - Lifetime CN202475433U (en) | 2012-02-07 | 2012-02-07 | Remote system for optical repeater station of FM broadcasting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202475433U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023573A (en) * | 2012-12-31 | 2013-04-03 | 厦门胜华通信技术有限公司 | Digital optical fiber repeater system for frequency modulation broadcast |
| CN113746554A (en) * | 2021-08-23 | 2021-12-03 | 福建信同信息科技有限公司 | Optical fiber radio frequency signal zooming device |
-
2012
- 2012-02-07 CN CN2012200378651U patent/CN202475433U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023573A (en) * | 2012-12-31 | 2013-04-03 | 厦门胜华通信技术有限公司 | Digital optical fiber repeater system for frequency modulation broadcast |
| CN103023573B (en) * | 2012-12-31 | 2015-06-03 | 厦门胜华通信技术有限公司 | Digital optical fiber repeater system for frequency modulation broadcast |
| CN113746554A (en) * | 2021-08-23 | 2021-12-03 | 福建信同信息科技有限公司 | Optical fiber radio frequency signal zooming device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |