CN109714552A - Single frequency network ground digital television broadcast transmitter based on satellite transmission - Google Patents
Single frequency network ground digital television broadcast transmitter based on satellite transmission Download PDFInfo
- Publication number
- CN109714552A CN109714552A CN201910129698.XA CN201910129698A CN109714552A CN 109714552 A CN109714552 A CN 109714552A CN 201910129698 A CN201910129698 A CN 201910129698A CN 109714552 A CN109714552 A CN 109714552A
- Authority
- CN
- China
- Prior art keywords
- power
- power amplifier
- digital television
- television broadcast
- frequency network
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims description 20
- 238000013461 design Methods 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 208000025274 Lightning injury Diseases 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 abstract 1
- 230000005284 excitation Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Transmitters (AREA)
- Radio Relay Systems (AREA)
Abstract
The present invention provides the single frequency network ground digital television broadcast transmitter transmitted based on satellite, using the active and standby driver of superior performance, High Linear pre-amplifier, by Freescale, the newest high power LD MOSFET linear amplifier (MRF6V3090 such as NXP, MRFE6VP8600/BLF888B) the prime formed, final stage power amplifier unit, high-precision power and the detection of other running parameters, processing circuit, the technologies such as touch chromatic liquid crystal screen and single-chip microcontroller control, with stable output power, non-linear distortion is small, band matches height, modulation error rate (MER) is low, spur performance is small, frequency accuracy is high, emission effciency is high, the features such as energy conservation and environmental protection.
Description
Technical field
The present invention relates to field of artificial intelligence, in particular to the single frequency network terrestrial DTV based on satellite transmission is wide
Broadcast transmitter.
Background technique
Current single frequency network terrestrial DTV transmitting is based on optical fiber or link microwave transmission information source and synchronous letter mostly
Breath, some is that the mode based on the modulation of UHF terrestrial digital signal radio demodulating is transmitted.Relative to above transmission side
Formula, the single-frequency network technology based on satellite transmission have that transmission link is ready-made, naturally synchronous, link is reliable and stable on a large scale for information source time delay
The advantages that equal, so that the single frequency network ground digital television transmitting system based on satellite transmission has, system design simplifies, basis is built
If expense is saved, engineering construction debugging is convenient, system is run and maintenance cost saving the advantages that reliability raising etc..
Summary of the invention
To realize above-mentioned technical purpose and the technique effect, proposing the single frequency network ground digital transmitted based on satellite
Television broadcasting transmitter, exchange 380V enter transmitter cabinet, required alternating current 220V are distributed by power distribution unit, exports each electricity consumption
Unit；Alternating current 220V becomes DC48V and 12V two-way from three Switching Power Supplies, and three road 48V direct currents export preposition function after stream collects
Put unit and final stage 300W power amplifier unit, it is characterised in that:
Bitstream enters by broadcasting exciter is input to front-located power amplifier, and front-located power amplifier accesses GPS/ Beidou dual-mode time service
Device；
It uses four power splitters to divide the power signal one of front-located power amplifier for four, exports four final stage power amplifier units, then by four
Synthesizer merges output power signal, and output end accesses a coupler and bandpass filter, while by the output end of coupler
Wave detector is accessed, and display and control unit is accessed by wave detector.
Preferably, the power distribution unit includes deconcentrator, arrester, A.C. contactor, solid-state relay.
Preferably, the power unit includes fan unit, total display and control unit, front-located power amplifier, ground digital television broadcast
Driver, 300W power amplifier unit.
Preferably, the final stage power amplifier unit 120W power amplifier module is designed using Doherty.
Preferably, the switching switch of the four power splitters input terminal is the RF switching switch of 2 positions, response time <
20ms；Backup is terminated with the power termination resistance of 50 Ω of a 50W, guarantees matching of the standby host under any state.
Preferably, the front-located power amplifier uses AGC/ALC+MRF3090 power amplifier unit+MRFE6VP8600/
BLF888B power amplifier unit.
Preferably, the output of the transmitter is by four synthesizers after coupler and high-power six chambers band-pass filter
Output.
Preferably, the transmitter further includes a fan unit, and independent insertion box-type fan unit is equipped with one times of redundancy
Blower, warm back-up work；Each blower of fan unit uses same size low noise AC axial-flow fan.
It is different from the prior art, the output of the machine is by four synthesizers through coupler and high-power six chambers band-pass filter
After export, performance is good, power foot, it is high-efficient.
Ground digital television broadcast emission system is just constituted plus ground digital television broadcast driver by the machine.Due to this
Machine is double excitation design, in addition two tread digital television broadcasting drivers (supporting the single frequency network transmitted based on satellite) He Yitai
It is wide just to constitute the double excitation single frequency network terrestrial DTV transmitted based on satellite for GPS Beidou dual-mode time service device needed for single frequency network
Broadcast emission system.
The machine is that the digital terrestrial television emission system equipment needed for constituting has reserved space and power supply, allows system side
Just it forms.
Detailed description of the invention
Fig. 1 is transmitter principle structure chart of the present invention.
Fig. 2 is double excitation of the present invention and four power splitter principle assumption diagrams.
Fig. 3 is four power splitter principle assumption diagrams of the invention.
Fig. 4 is present invention coupling filtering and output unit principle assumption diagram.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Based on the single frequency network ground digital television broadcast transmitter of satellite transmission, exchange 380V enters transmitter cabinet, by matching
Electric unit is distributed into required alternating current 220V, exports each power unit；Alternating current 220V from three Switching Power Supplies become DC48V and
12V two-way, three road 48V direct currents stream exports front-located power amplifier unit and final stage 300W power amplifier unit after collecting, as shown in Figure 1, number
Code stream enters by broadcasting exciter is input to front-located power amplifier, and front-located power amplifier accesses GPS/ Beidou dual-mode time service device；
It uses four power splitters to divide the power signal one of front-located power amplifier for four, exports four final stage power amplifier units, then by four
Synthesizer merges output power signal, and output end accesses a coupler and bandpass filter, while by the output end of coupler
Wave detector is accessed, and display and control unit is accessed by wave detector, specific:
Using exchange 380V power supply, after exchange 380V enters transmitter cabinet, by power distribution unit deconcentrator, arrester, exchange
Contactor, solid-state relay etc. are distributed into required alternating current 220V, supply each power unit, fan unit, total display and control unit, preceding
Set power amplifier, ground digital television broadcast driver, 300W power amplifier unit etc..Alternating current 220V is become by three Switching Power Supplies (CP2725)
For DC48V and 12V two-way, three road 48V direct currents stream is powered after collecting to front-located power amplifier unit and final stage 300W power amplifier unit；
12V is for front-located power amplifier unit.
Bitstream (TS) containing digital television information is sent into the (excitation of XG913G01-S ground digital television broadcast driver
Local oscillator has the VCO of a low phase noise in device, and the requirement of DTV is able to satisfy with phase noise after guarantee mixing.This equipment
The high-precision constant-temperature crystal oscillator of high stability is used in multiple frequency network, MFN work, and then the 10MHz of external GPS makees in single frequency network work
Frequency source) it is modulated into required radio frequency (RF) signal, it is sent out through channel filter.Functional performance of this part by driver and
GPS/ Beidou dual-mode time service device is completed.
RF signal from XG913G01-S ground digital television broadcast driver enters the XGPA50D linear preregulator of the machine
Power amplifier exports High Linear 10W grades of RF power signal, pushes final stage linear power to put after active-standby switch circuit and four power splitters
Big device.
It is four that four power splitters, which divide the promotion power signal one of XGPA50D linear preregulator power amplifier, through four 300W final stage function
After putting unit amplification, then four being carried out by four synthesizers and is combined into one, sum total success rate is more than 1200W, outputting high quality after filtering
1000W power-handling capability.
The 120W power amplifier module (XGPA120D) of 300W final stage power amplifier unit is designed using Doherty (Doherty), therefore
Have the characteristics that high-gain, high efficiency, High Linear.
300W power amplifier unit has current detecting and protection, RF, VSWR detection and protection, temperature detection and protection.
Transmitter the machine of the present invention can realize double excitation, as shown in Fig. 2, XG913G01-S ground digital television broadcast first
Driver has the double excitation function being switched fast, and RF output is actively closed when catastrophe failure occurs in master driver itself, together
When inform the display and control unit of host, the switching that display and control unit switches four distributor input terminals immediately is switched to standby driver, is realized
Excitation backup and active-standby switch.
What the double excitation of the machine was carried out is the strategy of modulation and prime Linear Power Amplifier (front-located power amplifier) one, i.e., by one
XG913G01-S ground digital television broadcast driver and XGPA50D linear preregulator power amplifier composition motivate all the way, in order to
Guarantee that complete machine (inputs) fault-free bottleneck from TS.Guarantee the reliability and stability of complete machine.
As shown in schematic diagram, total display and control unit and double excitation device of the machine and double front-located power amplifiers have communication, can be at any time
Know the working condition and running parameter of double excitation device and double front-located power amplifiers, whether driver and front-located power amplifier break down,
Status of Backups can be switched to.There are two types of Status of Backups: activestandby state and each other activestandby state, user can choose
The output of the machine is exported after coupler and high-power six chambers band-pass filter by four synthesizers, and performance is good,
Power foot, it is high-efficient.
Ground digital television broadcast emission system is just constituted plus ground digital television broadcast driver by the machine.Due to this
Machine is double excitation design, in addition two tread digital television broadcasting drivers (supporting the single frequency network transmitted based on satellite) He Yitai
It is wide just to constitute the double excitation single frequency network terrestrial DTV transmitted based on satellite for GPS Beidou dual-mode time service device needed for single frequency network
Broadcast emission system.
Under normal conditions, the work and switching of system are to carry out automatically.User can also be with manual intervention, from master when necessary
Display screen rapidly enters carry out manual switching.
In order to improve reliability, rapidity is taken into account, it is normally opened standby that the machine will back up driver, close RF output.It is being connected to
Enter fully operational state after work order, opens RF.It not only ensure that and be switched fast in this way, but also improve reliability, Er Qiejie
It can consumption reduction.
Four power splitter application Wilkinson principles, are designed using blending agent.It is lost low, matches, bandwidth, volume
It is small, it is easy to use.
The switching switch of four power splitter input terminals is the RF switching switch of 2 positions, response time < 20mS；Back up end
It is connected to the power termination resistance of 50 Ω of a 50W, guarantees matching of the standby host under any state.Ensure that the reliable of backup and
The safety and stability of system, principle are as shown in Figure 3.
Four 300W final stage power amplifier units of transmitter are defeated by a coupler and bandpass filter after power combing
Out, while by the RF signal demodulator of coupling output display and control unit is given, detects output power and reflection power, principle such as Fig. 4: six
The high-power bandpass filter of chamber elliptic function uses cross-coupling technique and technique for temperature compensation；Especially temperature-compensating skill
Art, using the line of different metal material expands the relationship between temperature-compensating；By long-term research and development, grasp rich
Rich practical experience and there is originality.Enable filter between -40 DEG C~+60 DEG C, normal work very in wide temperature range
Make.And loss is small, selectivity is high, is suitble to the synthesis of adjacent frequency multiplexing, single-antenna transmission.Adjacent frequency synthesis can not only reduce antenna feeder cost, but also
Non-renewable frequency resource can be saved.Its main indicator includes:
Insertion loss at fo: -0.3dB.
With interior unevenness: it is 0dB with fo, loss is -0.3dB at fo-3.6MHz, the loss of the place fo+3.6MHz is -
0.32dB。
Selectivity: being 0dB, fo ± 4.2MHz >=4dB with fo.
Output interface: 1-5/8.
Independent insertion box-type blower (blowing) unit of the present invention, is equipped with one times of redundancy of blower (schematic diagram is as follows), hot standby
Part work, has fully ensured that the heat dissipation of transmitter is good.Simultaneously because take Redundancy Design in heat dissipation design, at one or
In the case that two fan units break down, transmitter can also be worked normally.Even if the case where fan unit damages completely
Under, due to the Redundancy Design of power amplifier unit radiator, transmitter still can work the short time, be unlikely to be rapidly heated and burn out.
Independent insertion box-type fan unit not only high reliablity, and it is convenient to install and maintain.Certainly, there are also temperature detection and
Defencive function strengthens product stability and reliability.
Each blower of fan unit use same size low noise AC axial-flow fan, air quantity by emulation, calculate, test,
Verifying, and there are enough redundancies and backups.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright description, or direct or brief introduction are used in other correlative technology fields,
It is included within the scope of the present invention.
Claims (10)
1. exchange 380V enters transmitter cabinet, by distribution based on the single frequency network ground digital television broadcast transmitter of satellite transmission
Unit is distributed into required alternating current 220V, exports each power unit；Alternating current 220V becomes DC48V and 12V from three Switching Power Supplies
Two-way, three road 48V direct currents stream export front-located power amplifier unit and final stage 300W power amplifier unit after collecting, it is characterised in that:
Bitstream enters by broadcasting exciter is input to front-located power amplifier, and front-located power amplifier accesses GPS/ Beidou dual-mode time service device；
It uses four power splitters to divide the power signal one of front-located power amplifier for four, exports four final stage power amplifier units, then synthesized by four
Device merges output power signal, and output end accesses a coupler and bandpass filter, while the output end of coupler being accessed
Wave detector, and display and control unit is accessed by wave detector.
2. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the power distribution unit includes deconcentrator, arrester, A.C. contactor, solid-state relay.
3. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the power unit includes fan unit, total display and control unit, front-located power amplifier, ground digital television broadcast driver, 300W function
Put unit.
4. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the final stage power amplifier unit 120W power amplifier module is designed using Doherty.
5. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the switching switch of the four power splitters input terminal is the RF switching switch of 2 positions, response time < 20ms；Back up end
It is connected to the power termination resistance of 50 Ω of a 50W, guarantees matching of the standby host under any state.
6. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the front-located power amplifier uses AGC/ALC+MRF3090 power amplifier unit+MRFE6VP8600/BLF888B power amplifier unit.
7. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the output of the transmitter is exported after coupler and high-power six chambers band-pass filter by four synthesizers.
8. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the transmitter further includes a fan unit, and independent insertion box-type fan unit is equipped with one times of redundancy of blower, hot standby
Part work；Each blower of fan unit uses same size low noise AC axial-flow fan.
9. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: the transmitter accesses lightning rod in exchange input, while using lightning protection power source in Switching Power Supply, and protection final stage power amplifier exists
Lightning stroke will not be by broken by lightning when passing through.
10. the single frequency network ground digital television broadcast transmitter according to claim 1 based on satellite transmission, feature exist
In: four synthesizer is typical case's Ji Saier circuit theory, air strip line design, using the high-power output of 3KW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129698.XA CN109714552A (en) | 2019-02-21 | 2019-02-21 | Single frequency network ground digital television broadcast transmitter based on satellite transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129698.XA CN109714552A (en) | 2019-02-21 | 2019-02-21 | Single frequency network ground digital television broadcast transmitter based on satellite transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109714552A true CN109714552A (en) | 2019-05-03 |
Family
ID=66264859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910129698.XA Pending CN109714552A (en) | 2019-02-21 | 2019-02-21 | Single frequency network ground digital television broadcast transmitter based on satellite transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109714552A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835666A (en) * | 2020-07-10 | 2020-10-27 | 成都六三零电子设备有限公司 | A 5.73～5.81GHz/50W Linear Frequency Modulation Transmitter |
| CN117614564A (en) * | 2023-11-27 | 2024-02-27 | 广州程星通信科技有限公司 | Signal output method and device based on Ka frequency band transmitter |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005086300A (en) * | 2003-09-05 | 2005-03-31 | Sharp Corp | Television signal receiving apparatus, television signal transmitting / receiving apparatus, and electronic apparatus |
| US6985035B1 (en) * | 1998-11-12 | 2006-01-10 | Broadcom Corporation | System and method for linearizing a CMOS differential pair |
| WO2007093790A1 (en) * | 2006-02-15 | 2007-08-23 | University Of Westminster | Satellite radio navigation receivers |
| WO2013136654A1 (en) * | 2012-03-15 | 2013-09-19 | 株式会社 東芝 | Transmission system and method for controlling same |
| CN203734670U (en) * | 2014-02-20 | 2014-07-23 | 成都新光微波工程有限责任公司 | L-frequency band satellite data multimedia system |
| CN203734745U (en) * | 2014-02-20 | 2014-07-23 | 成都新光微波工程有限责任公司 | L-frequency band digital multimedia transmitter |
| CN205160703U (en) * | 2015-11-17 | 2016-04-13 | 成都广达新网科技股份有限公司 | Satellite television and cable television signal processing device |
| CN106231215A (en) * | 2016-07-22 | 2016-12-14 | 中仪英斯泰克进出口公司 | Simulated television transmitting station system |
| RU2621058C1 (en) * | 2015-12-17 | 2017-05-31 | Общество с ограниченной ответственностью "Тайфун Связь Монтаж" | Mobile video transmission complex |
| WO2017197954A1 (en) * | 2016-05-16 | 2017-11-23 | 江苏指南针导航通信技术股份有限公司 | Low-noise power amplifier used for satellite navigation and time service, and method for use |
| CN206894777U (en) * | 2017-07-07 | 2018-01-16 | 成都新光微波工程有限责任公司 | High-performance high efficiency 1000W digital TV transmitters |
| CN207251822U (en) * | 2017-09-14 | 2018-04-17 | 海华电子企业(中国)有限公司 | A kind of terrestrial DTV covers system |
| CN209283369U (en) * | 2019-02-21 | 2019-08-20 | 成都新光微波工程有限责任公司 | Single frequency network ground digital television broadcast transmitter based on satellite transmission |
-
2019
- 2019-02-21 CN CN201910129698.XA patent/CN109714552A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6985035B1 (en) * | 1998-11-12 | 2006-01-10 | Broadcom Corporation | System and method for linearizing a CMOS differential pair |
| JP2005086300A (en) * | 2003-09-05 | 2005-03-31 | Sharp Corp | Television signal receiving apparatus, television signal transmitting / receiving apparatus, and electronic apparatus |
| WO2007093790A1 (en) * | 2006-02-15 | 2007-08-23 | University Of Westminster | Satellite radio navigation receivers |
| WO2013136654A1 (en) * | 2012-03-15 | 2013-09-19 | 株式会社 東芝 | Transmission system and method for controlling same |
| CN203734670U (en) * | 2014-02-20 | 2014-07-23 | 成都新光微波工程有限责任公司 | L-frequency band satellite data multimedia system |
| CN203734745U (en) * | 2014-02-20 | 2014-07-23 | 成都新光微波工程有限责任公司 | L-frequency band digital multimedia transmitter |
| CN205160703U (en) * | 2015-11-17 | 2016-04-13 | 成都广达新网科技股份有限公司 | Satellite television and cable television signal processing device |
| RU2621058C1 (en) * | 2015-12-17 | 2017-05-31 | Общество с ограниченной ответственностью "Тайфун Связь Монтаж" | Mobile video transmission complex |
| WO2017197954A1 (en) * | 2016-05-16 | 2017-11-23 | 江苏指南针导航通信技术股份有限公司 | Low-noise power amplifier used for satellite navigation and time service, and method for use |
| CN106231215A (en) * | 2016-07-22 | 2016-12-14 | 中仪英斯泰克进出口公司 | Simulated television transmitting station system |
| CN206894777U (en) * | 2017-07-07 | 2018-01-16 | 成都新光微波工程有限责任公司 | High-performance high efficiency 1000W digital TV transmitters |
| CN207251822U (en) * | 2017-09-14 | 2018-04-17 | 海华电子企业(中国)有限公司 | A kind of terrestrial DTV covers system |
| CN209283369U (en) * | 2019-02-21 | 2019-08-20 | 成都新光微波工程有限责任公司 | Single frequency network ground digital television broadcast transmitter based on satellite transmission |
Non-Patent Citations (4)
| Title |
|---|
| 凌华生等: "《电视技术通览》", 30 September 2010, 南宁：广西科学技术出版社, pages: 188 - 190 * |
| 刘欣桐;: "XG300UT-300D单频网地面数字电视广播发射机原理与故障分析", 电子世界, no. 06, pages 1 * |
| 汤旭光;: "对数字电视发射机输出滤波器的讨论", 广播电视信息, no. 09, pages 5 * |
| 雷振亚等: "《射频微波电路导论第2版》", 30 November 2017, 西安电子科技大学出版社, pages: 68 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111835666A (en) * | 2020-07-10 | 2020-10-27 | 成都六三零电子设备有限公司 | A 5.73～5.81GHz/50W Linear Frequency Modulation Transmitter |
| CN117614564A (en) * | 2023-11-27 | 2024-02-27 | 广州程星通信科技有限公司 | Signal output method and device based on Ka frequency band transmitter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209283369U (en) | Single frequency network ground digital television broadcast transmitter based on satellite transmission | |
| CN109714552A (en) | Single frequency network ground digital television broadcast transmitter based on satellite transmission | |
| CN202872780U (en) | Covering apparatus of ultra-wide band distribution system and radio frequency module thereof | |
| CN101895337A (en) | Double-fiber hot backup radio-frequency intelligent optical module | |
| CN104301049A (en) | Dual channel passive device power tolerance test system | |
| CN201499228U (en) | N+1 transmitting device of DVB-T | |
| CN103326745A (en) | Terrestrial digital television broadcasting redundancy transmitting device and redundancy method | |
| CN203275508U (en) | Power capability testing device and power amplifier unit | |
| CN209415698U (en) | Communication circuit of indoor unit and outdoor unit of air conditioner and air conditioner | |
| CN204131614U (en) | A kind of N+1 digital television transmitting device | |
| CN218734303U (en) | WIFI transceiver module | |
| CN1841951B (en) | Method for switching a power amplifier | |
| CN206149276U (en) | Light switching switch RF power detection circuit | |
| CN110429984A (en) | One kind simulating optical communication system for time division duplex | |
| CN213305365U (en) | UHF frequency channel switch filter bank module | |
| CN101557247A (en) | TD-SCDMA repeater and method for processing uplink and downlink of signals | |
| CN107786256A (en) | Telecommunications bimodulus indoor coverage equipment | |
| CN202772889U (en) | Hierarchical and stand-by function integrating module for signal transmission | |
| CN203537563U (en) | Multi-mode wireless communication terminal used for testing electrical network communication quality of service (QoS) | |
| CN208548714U (en) | A kind of intelligent capacitor based on NB-IoT | |
| CN202231874U (en) | GSM micropower repeater capable of automatically locking base station BCCH | |
| CN201904922U (en) | Digital frequency shift companding system | |
| CN112994232A (en) | Configuration installation method of dual-power supply special transformer user electric energy metering and collecting equipment | |
| JPH01248832A (en) | Alarm radio receiver | |
| CN204790402U (en) | Radio frequency switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190503 |
|
| RJ01 | Rejection of invention patent application after publication |