CN100420284C - Power intensifier system for cofrequency transmitting of digital television - Google Patents
Power intensifier system for cofrequency transmitting of digital television Download PDFInfo
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- CN100420284C CN100420284C CNB2005100503938A CN200510050393A CN100420284C CN 100420284 C CN100420284 C CN 100420284C CN B2005100503938 A CNB2005100503938 A CN B2005100503938A CN 200510050393 A CN200510050393 A CN 200510050393A CN 100420284 C CN100420284 C CN 100420284C
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- power
- low noise
- channel filter
- digital television
- noise amplifier
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Abstract
The present invention relates to a power enhancement system used for digital TV common-frequency retransmission, which comprises a donor antenna, a tower amplifier, a power enhancement host and a retransmission antenna, wherein the donor antenna is connected with the input end of the tower amplifier; the power enhancement host is composed of a first channel filter, a second channel filter, a low noise amplifier, an MF processor, a power amplification unit, a CPU control unit and a power supply; the first channel filter, the low noise amplifier, the MF processor and the power amplification unit are orderly connected with the second channel filter; the tower amplifier is connected with the input end of the first channel filter; the output end of the second channel filter is connected with the retransmission antenna. The present invention has the advantage that signals are retransmitted in the same frequency. The present invention is suitable for different frequency bands and different output powers of digital TV common-frequency retransmission power enhancers and has good service performance. The present invention can guarantee the quality of digital TV signals and the signal coverage of blind areas to make the digital TV signals extend forwards continuously.
Description
Technical field
The present invention relates to the Digital Television transmitter, particularly a kind of Digital Television that is used for is with the power intensifier system of transmitting frequently.
Background technology
Under the situation that Digital Television is promoted day by day, in some markets, underground parking, tunnel, skyscraper, elevator, public place of entertainment and outskirts of a town and outlying zone,, will be unthinkable if there is not the covering of digital television signal.Characteristics in conjunction with digital TV transmitter, can not cover poor zone or signal blind zone at each digital television signal and all set up a transmitting station, so all set up Digital Television with frequency repeating power booster system device usually in these zones, the native system device well solves these problems.Power intensifier is to utilize directive antenna that digital television signal is introduced, and digital television signal is carried out filtering amplify, but do not do any frequency translation, is transmitted into the shadow region with directive antenna again.But because the isolation of input, output antenna is limited, for fear of the amplifier self-excitation, amplifying power can not be too big usually.Power intensifier also can be used to the improvement of indoor reception, because building is to attenuation of Electromagnetic, indoor signal strength signal intensity is significantly less than the intensity of outdoor signal, and the major parameter of power intensifier is gain, sensitivity, power output, intermodulation and linearity.
Summary of the invention
The present invention will solve the defective of above-mentioned prior art, provides a kind of Digital Television that is used for the power intensifier system of transmitting frequently.This system can effectively solve digital TV transmitter can not the overlay area signal quality of digital television problem.
The present invention solves the technical scheme that its technical problem adopts.This Digital Television that is used for is with the power intensifier system of transmitting frequently, mainly comprise donor antenna, tower amplifier, power intensifier main frame and retransmitting antenna, the wherein main donor antenna that receives the digital television signal of next autonomous cell site is connected with the tower amplifier input by coaxial wire; The power intensifier main frame is made up of first channel filter, second channel filter, low noise amplifier, intermediate frequency process, power amplification unit, CPU control unit and power supply, wherein first channel filter, low noise amplifier, intermediate frequency process, power amplification unit and second channel filter are connected successively, the output of tower amplifier is connected with the input of first channel filter, and the output of second channel filter is connected with retransmitting antenna by coaxial wire; The CPU control unit is connected with low noise amplifier, intermediate frequency process and power amplification unit respectively.The digital television signal that donor antenna receives into is by behind the tower amplifier, at first first channel filter in the ingoing power booster main frame carries out filtering, send into low noise amplifier then, Power Amplifier Unit is sent in output after the intermediate frequency process again, reaches desired power and directly arrive retransmitting antenna by second channel filter through coaxial wire again and launch.
The Digital Television that is used for that the present invention relates to has outstanding feature with the power intensifier system of transmitting frequently in the field: 1, realize novel circuit structure on principle, signal is transmitted in same frequency, and Digital Television is with the different frequency range of frequency repeating power booster, different power outputs.Serviceability is good, can guarantee that the quality of digital television signal and the signal of blind area cover, and make digital television signal constantly extend forward; 2, on performance, really realized unattended operation, can adjust every running parameter, the mode of operation of this device by the remote wireless control system; GPS can directly locate this device accurately, improves the stationary problem of whole emission system effectively; 3, used the structure of easier installation on the engineering, made that installation is more convenient, the set-up time is within 2 hours; 4, owing to adapt to outdoor mounted, therefore the occasion of using is more extensive.In sum, this Digital Television has epoch making significance with the use of transmitting GAP FILLER device frequently, and has more use value.
Description of drawings
Fig. 1 is a principle block diagram of the present invention;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the circuit diagram of low noise amplifier part among the present invention;
Fig. 4 is the circuit diagram of intermediate power amplifier part of the present invention;
Fig. 5 is the circuit diagram of tower amplifier part among the present invention;
Fig. 6 is the structural representation of mid band filter segment of the present invention;
Fig. 7 is the circuit diagram of CPU control unit part among the present invention.
Description of reference numerals: 1-donor antenna, 2-tower amplifier, 3-power intensifier main frame, the 4-retransmitting antenna, 5-first channel filter, 6-second channel filter, the 7-low noise amplifier, the 8-intermediate frequency process, 9-Power Amplifier Unit, 10-CPU control unit, the 11-power supply, the 12-input and output connector, 13-bi-colour LED, 14-power connector, the 15-input connector, the 16-out connector, 17-input and output coupling line, 18-cavity, the 19-metal cylinder, the tuning screw rod of 20-, 21-screw rod, 22-top cover.
Embodiment
The invention will be described further below in conjunction with drawings and Examples:
Referring to above description of drawings, the present invention relates to a kind of Digital Television that is used for the power intensifier system (see figure 2) of transmitting frequently, mainly comprise donor antenna 1, tower amplifier 2, power intensifier main frame 3 and retransmitting antenna 4, the wherein main donor antenna 1 that receives the digital television signal of next autonomous cell site is connected with tower amplifier 2 inputs by coaxial wire; Power intensifier main frame 3 is made up of first channel filter 5, second channel filter 6, low noise amplifier 7, intermediate frequency process 8, power amplification unit 9, CPU control unit 10 and power supply 11, wherein first channel filter 5, low noise amplifier 7, intermediate frequency process 8, power amplification unit 9 and second channel filter 6 are connected successively, the output of tower amplifier 2 is connected with the input of first channel filter 5, and the output of second channel filter 6 is connected with retransmitting antenna 4 by coaxial wire; CPU control unit 10 is connected with low noise amplifier 7, intermediate frequency process 8 and power amplification unit 9 respectively.The bi-colour LED 13 that the bottom side input/output terminal of power intensifier main frame 3 respectively has an input and output connector 12 and indication host work state to use, and the power connector 14 of power supply usefulness; First channel filter 5 can be identical with first channel filter 6, and the scope of frequency can be regulated.
The wherein said donor antenna 1 main digital television signal that receives autonomous cell site, the requirement of antenna be certain directivity must be arranged, the input standing wave is little, lightning protection properties good, receptivity is stable.Retransmitting antenna 4 is to launch from the signal of power intensifier main frame, retransmitting antenna 4 has certain directivity, the output standing wave is little, lightning protection properties good, the requirement that also should have high power level in addition, little with the back lobe of donor antenna 1, promptly the isolation between retransmitting antenna 4 and the donor antenna 1 wants big.Described tower amplifier 2 is formed (as Fig. 1) by an input filter and a low noise amplifier, this low noise amplifier is constituted (as Fig. 5) by two 3dB directional couplers of CP0, CP1 jointly as the distribution of Q2, Q3-SPF-2086TK low noise amplifier tube and the synthetic first order of being formed and the high linear low noise amplifier tube of Q4-AGB3300, wherein in order to guarantee the linearity of Q2, Q3 amplifier tube, circuit C2, C3, C33, C34 and L2, L3 have formed good match circuit, and Q4 input, output impedance are to realize by two ends inductance and electric capacity; Described power intensifier main frame 3 is made up of first channel filter 5, second channel filter 6, low noise amplifier 7, intermediate frequency process 8, Power Amplifier Unit 9, CPU control unit 10 and power supply 11, first channel filter 5, second channel filter 6 need reach certain standard, what present stage also was not suitable for can buy, and needs oneself to design and obtains; Because present stage does not also have similar power intensifier 3 devices, therefore low noise amplifier 7 also needs by design processing, concrete principle such as Fig. 3 are listed, wherein the amplifier principle is identical with tower amplifier, some control interface circuit have just been increased, as mains switch, the alarm of tower amplifier, functional interfaces circuit such as alarm of low noise amplifier electric current and signal level detection.Element such as 1U8 and 1Q5 is formed the tower amplifier switching circuit by the control of cpu logic level among Fig. 3, has formed tower amplifier electric current warning circuit by integrated circuits such as 1U0,1U7,1U6, and wherein the voltage of TP7, TP8 is the alarm window.Formed the warning circuit of low noise amplifier by 1U9,1U4 and 1U5, wherein the voltage of TP3 and TP4 also is the alarm window.Formed signal incoming level testing circuit by 1U2A, 1U3 etc.; Intermediate frequency process 8 replaces by a cavity body filter, but the parameters of filter must meet certain requirement; As this figure of Fig. 6 is the vertical view of the removal top cover 22 of filter, cavity 18 is made by same block of material, be divided into six chambeies altogether, the most left and the rightest cavity is an absorbing cavity, this two chamber constitutes the absorption resonant element with the metal cylinder 19 and the tuning screw rod 20 that are positioned at wherein, metal cylinder 19 is a hollow structure, tuning screw rod 20 inserts wherein, by regulate 20 length make two chambeies respectively resonance in different frequencies, be reflected on the response curve of filter and on correspondent frequency point, form transmission zero exactly, thereby improve the squareness factor of filter, increased selectivity; All the other four chambeies form the main resonance unit with the metal cylinder and the tuning screw rod that are positioned at wherein, it is typical coaxial cavity comb filter structure, they produce the Chebyshev filter response, and the adjustment of filter center frequency mainly relies on the tuning screw rod 20 of regulating each main resonance unit to stretch into the length of metal cylinder 19.One end of input and output coupling line 17 links to each other with input and output connector 15,16 by the hole in the cavity 18, and the other end links to each other with the first segment or the final section of main resonance cylinder.Screw rod 21 has 5 bars between each resonant cavity, can adjust coupling coefficient between each chamber by regulating its length, thereby regulate the overall performance of filter.Described Power Amplifier Unit 9 must reach the certain power grade, divide level Four to amplify, the equal buyable of amplifier device, but its circuit structure needs self design, see Fig. 4, wherein first, second and third level all adopts high linearity, low noise, wide gain module, and input, output impedance are 50 ohm, need not to design impedance circuit.Three grades amplifier tube is respectively SGA-5486, AGB3300 and MHL9318, need certain electric capacity to be isolated between at different levels, be respectively C38, C39, C40 and C41, LDU25 is a power amplifier module buyable, use 2 MRF9030L power amplifier tubes to form, Power Amplifier Unit itself also has measuring ability, as power output detection, standing wave detection, power amplifier current detecting etc., the detection of power output is by the CP1 bridge coupler, be coupled out part energy after A/D conversion back to the I that directly enters composition such as U8 after operational amplifier amplifies
2The circuit theory that C circuit, standing wave detect is the same with the circuit of power output detection, and only the source of standing wave detection signal is that coupled end by the ISO1 isolator obtains, and the isolator coupled end must the coupling amount need some; Bridge coupler and isolator need reach the certain standard standard, otherwise with unavailable.When power output detects; some gives the automatic gain control circuit that U14, D3, U13, R32, L10, L11, D1, D2 and CP2 form the input except a part is done to amplifier; automatic gain control circuit can be at circuit gain the whole gain of control amplifier in the too high or power amplifier self-excitation, power amplifier is played certain protection also can make moderate progress to the linearity of power amplifier simultaneously.The circuit that R21, U5, U7, Q1 formed can detect the electric current of power amplifier and control, because this device uses outdoor, if so after TV station master cell site turns off, there is not power supply control, this device will move always, to energy-conservation be disadvantageous, therefore by circuit the power supply of power amplifying device is controlled.The realization of above-mentioned functions all can realize by CPU10, wherein U6, U8, U16 and I that external circuit constitutes
2C is the window that CPU realizes power amplifier is detected control.The hardware components of CPU control unit 10: adopt high speed 51 single-chip microcomputers (AT89C51RD2) as main control MCU; Extend out 32K capacity SRAM (TC55257DFL-85L), the equipment that guaranteed can embed real time operating system, can preserve mass data; Extend out 64K capacity Serial E ERAM (AT24C512), be specifically designed to system at application upgrade (IAP); Extend out serial ports expansion chip (ST16C2550CQ), can realize multiple communication mode easily; Select GPRS module G20 for use, can use multiple communication mode such as sms and gprs to realize the real-time monitoring and the warning of equipment; Have power supply main standby and switch, can realize functions such as power down warning; Software section: embedded real time operating system guarantees the stable, reliable of equipment operation; Have application upgrade (IAP) function, guarantee because the change of network etc. needs upgrade-system, mode that can long-range unattended duty is upgraded; Network management protocol is UNICOM's NMP; Test is separately all passed through in The software modularized design, each module, has guaranteed the stable, reliable of equipment operation.
Claims (5)
1. one kind is used for Digital Television with the power intensifier system of transmitting frequently, it is characterized in that: comprise donor antenna (1), tower amplifier (2), power intensifier main frame (3) and retransmitting antenna (4), the wherein main donor antenna (1) that receives the digital television signal of next autonomous cell site is connected with tower amplifier (2) input by coaxial wire; Power intensifier main frame (3) is by first channel filter (5), second channel filter (6), low noise amplifier (7), intermediate frequency process (8), power amplification unit (9), CPU control unit (10) and power supply (11) are formed, first channel filter (5) wherein, low noise amplifier (7), intermediate frequency process (8), power amplification unit (9) is connected successively with second channel filter (6), the output of tower amplifier (2) is connected with the input of first channel filter (5), and the output of second channel filter (6) is connected with retransmitting antenna (4) by coaxial wire; CPU control unit (10) is connected with low noise amplifier (7), intermediate frequency process (8) and power amplification unit (9) respectively.
2. the Digital Television that is used for according to claim 1 is with the power intensifier system of transmitting frequently, it is characterized in that: described tower amplifier (2) is made up of an input filter and a low noise amplifier, when being lower than certain numerical value, digital television signal intensity just can enable, low noise amplifier comprises by two 3dB directional coupler (CP0, CP1) and two SPF-2086TK low noise amplifier tube (Q2, Q3) the high linear low noise amplifier tube (Q4) of the first order of being formed and AGB3300, one of them 3dB directional coupler (CPO) is as two SPF-2086TK low noise amplifier tube (Q2, Q3) distribution, another 3dB directional coupler (CP1) is as two SPF-2086TK low noise amplifier tube (Q2, synthesizing Q3).
3. the Digital Television that is used for according to claim 1 and 2 is with the power intensifier system of transmitting frequently, it is characterized in that: the power supply of described tower amplifier (2) be from the power supply (11) of power intensifier main frame (3) by coaxial wire directly to its power supply, the CPU control unit (10) in the power intensifier main frame (3) is directly controlled the break-make of power supply (11).
4. the Digital Television that is used for according to claim 1 is with the power intensifier system of transmitting frequently, it is characterized in that: described intermediate frequency process (8) is a cavity body filter, left and the rightest chamber of cavity (18) is an absorbing cavity, this two chamber constitutes the absorption resonant element with the metal cylinder (19) and the tuning screw rod (20) that are positioned at wherein, metal cylinder (19) is a hollow structure, and tuning screw rod (20) inserts wherein; All the other chambeies form the main resonance unit with the metal cylinder (19) and the tuning screw rod (20) that are positioned at wherein, one end of an input and output coupling line (17) links to each other with input connector (15) by the hole in the cavity (18), and the other end links to each other with the first segment metal cylinder of main resonance unit; One end of another root input and output coupling line (17) by the hole in the cavity (18) with link to each other with out connector (16), the other end links to each other with the final section metal cylinder of main resonance unit; Screw rod (21) is used to adjust the coupling coefficient between each chamber between each adjacent two chamber of cavity.
5. the Digital Television that is used for according to claim 1 is with the power intensifier system of transmitting frequently, it is characterized in that, the bottom side input/output terminal of power intensifier main frame (3) respectively has an input and output connector (12), the bi-colour LED (13) that the bottom side input has indication host work state to use, the bottom side output has the power connector (14) of power supply usefulness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100503938A CN100420284C (en) | 2005-05-23 | 2005-05-23 | Power intensifier system for cofrequency transmitting of digital television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100503938A CN100420284C (en) | 2005-05-23 | 2005-05-23 | Power intensifier system for cofrequency transmitting of digital television |
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| CN1700746A CN1700746A (en) | 2005-11-23 |
| CN100420284C true CN100420284C (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100503938A Expired - Fee Related CN100420284C (en) | 2005-05-23 | 2005-05-23 | Power intensifier system for cofrequency transmitting of digital television |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI305979B (en) | 2006-03-24 | 2009-02-01 | Hon Hai Prec Ind Co Ltd | Wireless transceiving system |
| CN101835004B (en) * | 2009-12-08 | 2012-09-19 | 三维通信股份有限公司 | Frequency agility system for co-frequency forwarding of digital television |
| CN102843155B (en) * | 2012-07-17 | 2014-11-26 | 星辰先创通信系统(厦门)有限公司 | Construction method of intermediate-and-low-power integrated broadcasting transmitter drawer |
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Patent Citations (10)
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|---|---|---|---|---|
| CN2054600U (en) * | 1989-04-11 | 1990-03-14 | 绵阳市广播电视局 | Tv same frequency transmiting amplifier |
| US5802452A (en) * | 1996-01-17 | 1998-09-01 | Gte Government Systems Corporation | Multiple channel radio frequency repeater |
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| CN1700746A (en) | 2005-11-23 |
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