CN219420772U - Debugging device of wireless broadcasting equipment - Google Patents
Debugging device of wireless broadcasting equipment Download PDFInfo
- Publication number
- CN219420772U CN219420772U CN202320560938.3U CN202320560938U CN219420772U CN 219420772 U CN219420772 U CN 219420772U CN 202320560938 U CN202320560938 U CN 202320560938U CN 219420772 U CN219420772 U CN 219420772U
- Authority
- CN
- China
- Prior art keywords
- diode
- rds
- module
- acquisition module
- output end
- 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.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The application provides a debugging device of wireless broadcasting equipment. The wireless broadcasting equipment includes transmitter and the transmitting antenna that connects through the feeder, and the transmitting antenna broadcasts RDS signal according to the radio frequency signal of transmitter output, and the debugging device includes: the forward acquisition module is coupled with the feeder line and is used for acquiring the forward power of the radio frequency signal; the reverse acquisition module is coupled with the feeder line and is used for acquiring reverse power of the radio frequency signals; a receiving antenna for receiving RDS signals; the monitoring module is connected with the receiving antenna and used for decoding the RDS signal to obtain RDS information; the control module is respectively connected with the monitoring module, the forward acquisition module and the reverse acquisition module and is used for determining and displaying the standing wave ratio according to the forward power and the reverse power, and receiving and displaying the RDS information. The debugging equipment can test the matching degree between the transmitter and the transmitting antenna, can monitor the accuracy of the RDS signal transmission, and is more suitable for radio broadcasting equipment based on RDS technology.
Description
Technical Field
The application relates to the technical field of wireless broadcasting, in particular to a debugging device of wireless broadcasting equipment.
Background
In the erection and installation of a transmitter and a transmitting antenna of RDS (Radio Data System, radio broadcasting system) radio broadcasting, the connection condition between the transmitter and the transmitting antenna needs to be detected, debugged and installed, and because the transmitter power cannot be transmitted to the transmitting antenna for transmitting due to the fact that errors of erection, connection, placement and the like exist, the transmitting efficiency is low, and the transmitter is directly damaged when the reflected power is overlarge. The debugging device in the prior art has the problems of single function and higher cost.
Disclosure of Invention
The present application aims to solve at least one of the above technical drawbacks, and in particular, the technical drawbacks of the debugging device in the prior art, such as single function and high cost.
The application provides a debugging device of wireless broadcasting equipment, wireless broadcasting equipment includes transmitter and the transmitting antenna that connects through the feeder, and transmitting antenna broadcasts RDS signal according to the radio frequency signal of transmitter output, and the debugging device includes:
the forward acquisition module is coupled with the feeder line and is used for acquiring the forward power of the radio frequency signal;
the reverse acquisition module is coupled with the feeder line and is used for acquiring reverse power of the radio frequency signals;
a receiving antenna for receiving RDS signals;
the monitoring module is connected with the receiving antenna and used for decoding the RDS signal to obtain RDS information;
the control module is respectively connected with the monitoring module, the forward acquisition module and the reverse acquisition module and is used for determining and displaying the standing wave ratio according to the forward power and the reverse power, and receiving and displaying the RDS information.
In one embodiment, the control module includes a microprocessor and a display unit;
the microprocessor is respectively connected with the monitoring module, the forward acquisition module and the reverse acquisition module, and is used for determining standing wave ratio according to forward power and reverse power and transmitting RDS information to the display unit;
the display unit is used for displaying RDS information.
In one embodiment, the control module further comprises an input unit;
the input unit is connected with the microprocessor and is used for inputting target parameters to the microprocessor;
the microprocessor is connected with the transmitter and is used for generating a parameter setting signal according to the target parameter and outputting the parameter setting signal to the transmitter so as to set the transmitting parameter of the transmitter.
In one embodiment, the RDS information comprises at least one of field strength, address code, partition code, and sound code.
In one embodiment, the debugging device further comprises an audio playing module;
the monitoring module is connected with the audio playing module and is also used for converting the RDS signal into an audio signal and outputting the audio signal to the audio playing module;
the audio playing module is used for playing the audio signal.
In one embodiment, the listening module is a QN8035 chip.
In one embodiment, the forward acquisition module includes a first microstrip line, a first load matching network, a first diode, and a first detection resistor;
the first microstrip line is coupled with the feeder line, the first end of the first microstrip line is grounded through a first load matching network, and the second end of the first microstrip line is connected with the input end of the first diode;
the output end of the first diode is connected with the control module, and the output end of the first diode is grounded through the first load matching network.
In one embodiment, the forward acquisition module comprises a first filter capacitor and a second diode;
the output end of the first diode is connected with the output end of the second diode, and the output end of the first diode is grounded through the first filter capacitor;
the input end of the second diode is grounded.
In one embodiment, the reverse acquisition module comprises a second microstrip line, a second load matching network, a third diode and a second detection resistor;
the second microstrip line is coupled with the feeder line, the first end of the second microstrip line is grounded through a second load matching network, and the second end of the second microstrip line is connected with the input end of the third diode;
the output end of the third diode is connected with the control module, and the output end of the third diode is grounded through a second load matching network.
In one embodiment, the reverse acquisition module comprises a second filter capacitor and a fourth diode;
the output end of the third diode is connected with the output end of the fourth diode, and the output end of the third diode is grounded through a second filter capacitor;
the input end of the fourth diode is grounded.
From the above technical solutions, the embodiments of the present application have the following advantages:
based on any one of the embodiments, a forward acquisition module and a reverse acquisition module are provided to acquire forward power and reverse power of the radio frequency signals transmitted in the feeder line, respectively, and transmit the forward power and the reverse power to the control module. The control module can calculate standing wave ratio according to the forward power and the reverse power, so as to judge whether the impedance mismatch problem exists between the transmitter and the transmitting antenna. Meanwhile, in order to better monitor the radio broadcasting equipment based on the RDS technology, a monitoring module is further arranged in the debugging device, the RDS signal is analyzed through the monitoring module, and finally the analyzed RDS information is displayed through the control module. The debugging equipment in the embodiment can test the matching degree between the transmitter and the transmitting antenna, and can monitor the accuracy of the RDS signal transmission by a debugging person, so that the debugging equipment is more suitable for radio broadcasting equipment based on RDS technology.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic block diagram of a debugging device of a wireless broadcasting device according to an embodiment of the present application;
fig. 2 is a schematic block diagram of a debugging device of a wireless broadcasting device according to another embodiment of the present application;
fig. 3 is a schematic block diagram of a debugging device of a wireless broadcasting device according to another embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The embodiment of the application provides a debugging device of wireless broadcasting equipment, wherein the wireless broadcasting equipment is frequency-adjustable wireless broadcasting and comprises a transmitter and a transmitting antenna which are connected through a feeder line. The transmitter converts programs required to be transmitted by a radio station into radio frequency signals with different frequencies based on an RDS wireless broadcasting technology, and then the radio frequency signals are transmitted to a transmitting antenna through a feeder line. The transmitting antenna broadcasts an RDS signal according to the radio frequency signal. The relationship between the load impedance and the characteristic impedance of the feed line will affect the efficiency of the transmission of radio frequency signals in the feed line. When the load impedance on the feeder line is equal to the characteristic impedance of the transmission line, the reflected power on the feeder line is zero and the impedance between the transmission line and the load is matched, known as impedance matching. At this time, the wireless broadcasting device can perform broadcasting with high quality. However, when the load impedance on the feeder is not equal to the characteristic impedance of the transmission line, reverse power will occur on the feeder, and a greater reverse power means a higher degree of impedance mismatch, requiring adjustment of the wireless broadcast device.
The standing-wave ratio can reflect the impedance matching degree on the feeder line, and the debugging device comprises a forward acquisition module, a reverse acquisition module and a control module for calculating the standing-wave ratio. The forward acquisition module is coupled with the feeder line and is used for acquiring the forward power of the radio frequency signal. The reverse acquisition module is coupled with the feeder line and is used for acquiring reverse power of the radio frequency signals. It is understood that coupling herein refers to the ability of the radio frequency signal on the feed line to be conducted to the forward acquisition module and the reverse acquisition module. The control module can calculate and display the standing wave ratio according to the reverse power and the forward power, so that a debugging person can determine whether to adjust the assembly between the transmitter and the transmitting antenna.
In order to be more suitable for the use of RDS wireless broadcasting equipment, a receiving antenna and a monitoring module are further added in the debugging device. Wherein, the receiving antenna is used for receiving RDS signals. The monitoring module is connected with the receiving antenna and used for decoding the RDS signal to obtain RDS information. The debugging device can detect the standing wave ratio of the radio frequency signal and monitor the RDS signal transmitted by the transmitting antenna. And analyzing the RDS signal by the monitoring module to obtain RDS information. The RDS information includes a description of the characteristics of the RDS signal transmitted by the radio broadcast device. For example, the field strength of the corresponding frequency at which the RDS signal is transmitted, the address code of the transmitter, the partition code, the volume code, etc.
Wherein the address code is used to identify the unique identity of the broadcaster. The address code may consist of 4 letters or numbers, wherein the first two characters represent a country or region code and the second two characters represent a unique identity code of the broadcaster. Partition codes are used to describe the type of broadcast station, such as music, news, sports, etc. The partition code may be a code represented by a number. Each number corresponds to a different meaning. For example, pty=1 indicates that the current broadcast is popular music, pty=2 indicates that the current broadcast is rock music, pty=3 indicates that the current broadcast is light music, and the like. The volume code is used to control the volume level of the radio broadcast. For example, 16 levels are set up in total, from 0 to 15, where 0 represents silence and 15 represents maximum volume.
The monitoring module transmits the RDS information to the control module, and the control module can display the standing-wave ratio and the RDS information, so that debugging personnel can know the state of the wireless broadcasting equipment conveniently. The specific manner of presentation may be visual, auditory or a combination of audio and visual. For example, the standing-wave ratio and the RDS information are displayed through the display unit, a rolling playing mode can be adopted, the standing-wave ratio and the RDS information are broadcasted through voice, and a combination of the two modes can be adopted.
The debugging device based on the wireless broadcasting equipment in the embodiment is provided with a forward acquisition module and a reverse acquisition module, respectively acquires forward power and reverse power of radio frequency signals transmitted in a feeder line, and transmits the forward power and the reverse power to a control module. The control module can calculate standing wave ratio according to the forward power and the reverse power, so as to judge whether the impedance mismatch problem exists between the transmitter and the transmitting antenna. Meanwhile, in order to better monitor the radio broadcasting equipment based on the RDS technology, a monitoring module is further arranged in the debugging device, the RDS signal is analyzed through the monitoring module, and finally the analyzed RDS information is displayed through the control module. The debugging equipment in the embodiment can test the matching degree between the transmitter and the transmitting antenna, and can monitor the accuracy of the RDS signal transmission by a debugging person, so that the debugging equipment is more suitable for radio broadcasting equipment based on RDS technology.
In one embodiment, the control module includes a microprocessor and a display unit. The microprocessor is respectively connected with the monitoring module, the forward acquisition module and the reverse acquisition module, and is used for determining standing wave ratio according to the forward power and the reverse power and transmitting RDS information to the display unit. The display unit is used for displaying RDS information. I.e. the control module is at least composed of a microprocessor with data processing capability and a display unit with display function. The microprocessor calculates standing wave ratio and converts RDS information into data format required by the display unit, and then transmits the data format to the display unit. For example, when the display unit is an LCD display, the microprocessor communicates with the LCD display through a serial port. In addition, the microprocessor can also transmit the forward power and the reverse power to the display unit, and the display unit displays the forward power and the reverse power to debugging personnel.
In one embodiment, the control module further comprises an input unit. The input unit is connected with the microprocessor and is used for inputting target parameters to the microprocessor. The debugger can interact with the microprocessor through the input unit, and inputs the content needing to modify the transmitting parameters of the transmitter into the microprocessor. The microprocessor is connected with the transmitter, generates a parameter setting signal according to the target parameter, and outputs the parameter setting signal to the transmitter so as to set the transmitting parameter of the transmitter. Namely, the transmitter reads the target parameters from the parameter setting signals, and then sets the transmitting parameters according to the target parameters. The transmission parameters that can be set include transmission frequency, transmission address code, volume code, and the like. The input unit may be a mechanical key, a mouse, a touch pad, etc. The input unit and the microprocessor can be connected through a serial port.
In one embodiment, the debugging device further comprises an audio playing module for further adapting to the debugging of the RDS radio broadcasting device. The monitoring module is connected with the audio playing module and is also used for converting the RDS signal into an audio signal and outputting the audio signal to the audio playing module. The audio playing module is used for playing the audio signal. It can be understood that the RDS signal is decoded and converted into an audio signal after being received by the listener, and then is played out by the audio playing module to listen to the program broadcast by the radio station. In order to facilitate the debugging personnel to know the broadcasting effect, the debugging equipment can also be used as a listener to try to listen when broadcasting the RDS signal, and the debugging personnel judges whether the broadcasting effect is qualified or not, so as to determine whether to debug the wireless broadcasting equipment or not.
In one embodiment, the listening module is a QN8035 chip. The QN8035 chip has high performance and low power consumption, supports a single chip frequency modulation receiver IC of a global frequency modulation broadcast band, and also supports RDS/RBDS data service. Therefore, the sound output port of the device can be connected with the audio playing module to output the audio signal corresponding to the RDS signal to the audio playing module, and the I2C output port of the device is connected with the control module to transmit the RDS information to the control module.
In one embodiment, referring to fig. 2, the forward acquisition module includes a first microstrip line 211, a first load matching network 212, a first diode 213, and a first detection resistor 214.
The first microstrip line is coupled with the feeder line, i.e. the forward power condition transmitted on the feeder line can be conducted to the first microstrip line. The first end of the first microstrip line is grounded through the first load matching network so as to increase the power and stability of the first microstrip line. The second end of the first microstrip line is connected with the input end of the first diode. The output end of the first diode is connected with the control module, and the output end of the first diode is grounded through a first detection resistor. I.e. corresponds to sampling the power transmitted on the first microstrip line with the first detection resistor to transmit forward power to the control module.
In one embodiment, the forward acquisition module includes a first filter capacitor 215 and a second diode 216. The output end of the first diode is grounded through the first filter capacitor, so that noise in the first microstrip line is filtered through the first filter capacitor. The output end of the first diode is connected with the output end of the second diode, and the input end of the second diode is grounded. The second diode can protect the pin of the control module, and when the amplitude of the signal voltage transmitted to the control module by the first detection resistor is too large, the second diode can be reversely broken down, so that the control module is prevented from being damaged.
In one embodiment, the reverse collection module includes a second microstrip line, a second load matching network, a third diode, and a second detection resistor. The second microstrip line is coupled to the feeder line, i.e. the reverse power transmitted on the feeder line can be conducted to the second microstrip line. The first end of the second microstrip line is grounded through a second load matching network to increase the power and stability of the second microstrip line. The second end of the second microstrip line is connected with the input end of the third diode. The output end of the third diode is connected with the control module, and the output end of the third diode is grounded through a second detection resistor. I.e. corresponds to sampling the power transmitted on the second microstrip line with the second detection resistor to transmit the reverse power to the control module.
In one embodiment, the reverse acquisition module includes a second filter capacitor and a fourth diode. The output end of the fourth diode is grounded through the second filter capacitor, so that noise in the second microstrip line is filtered through the second filter capacitor. The output end of the third diode is connected with the output end of the fourth diode, and the input end of the fourth diode is grounded. The fourth diode can protect the pin of the control module, and when the amplitude of the signal voltage transmitted to the control module by the second detection resistor is too large, the fourth diode can be reversely broken down, so that the control module is prevented from being damaged.
In one embodiment, the first load matching network or the second load matching network may be composed of two resistors connected in parallel.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and may be combined according to needs, and the same similar parts may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A debugging device of a radio broadcasting apparatus, wherein the radio broadcasting apparatus includes a transmitter and a transmitting antenna connected through a feeder line, the transmitting antenna broadcasting an RDS signal according to a radio frequency signal output by the transmitter, the debugging device comprising:
the forward acquisition module is coupled with the feeder line and is used for acquiring the forward power of the radio frequency signal;
the reverse acquisition module is coupled with the feeder line and is used for acquiring reverse power of the radio frequency signal;
a receiving antenna for receiving the RDS signal;
the monitoring module is connected with the receiving antenna and used for decoding the RDS signal to obtain RDS information;
and the control module is respectively connected with the monitoring module, the forward acquisition module and the reverse acquisition module and is used for determining and displaying the standing wave ratio according to the forward power and the reverse power, and receiving and displaying the RDS information.
2. The debugging device of claim 1, wherein the control module comprises a microprocessor and a display unit;
the microprocessor is respectively connected with the monitoring module, the forward acquisition module and the reverse acquisition module, and is used for determining standing wave ratio according to the forward power and the reverse power and transmitting the RDS information to the display unit;
the display unit is used for displaying the RDS information.
3. The debugging device of claim 2, wherein the control module further comprises an input unit;
the input unit is connected with the microprocessor and is used for inputting target parameters to the microprocessor;
the microprocessor is connected with the transmitter, and is used for generating a parameter setting signal according to the target parameter and outputting the parameter setting signal to the transmitter so as to set the transmitting parameter of the transmitter.
4. A commissioning apparatus according to claim 3, wherein the RDS information comprises at least one of field strength, address code, partition code and sound code.
5. The debugging device of claim 1, wherein the debugging device further comprises an audio playing module;
the monitoring module is connected with the audio playing module and is also used for converting the RDS signal into an audio signal and outputting the audio signal to the audio playing module;
the audio playing module is used for playing the audio signal.
6. The debugging device of any one of claims 1-5, wherein the listening module is a QN8035 chip.
7. The debugging device of claim 1, wherein the forward acquisition module comprises a first microstrip line, a first load matching network, a first diode, and a first detection resistor;
the first microstrip line is coupled with the feeder line, a first end of the first microstrip line is grounded through the first load matching network, and a second end of the first microstrip line is connected with the input end of the first diode;
the output end of the first diode is connected with the control module, and the output end of the first diode is grounded through the first load matching network.
8. The debugging apparatus of claim 7, wherein the forward acquisition module comprises a first filter capacitor and a second diode;
the output end of the first diode is connected with the output end of the second diode, and the output end of the first diode is grounded through the first filter capacitor;
the input end of the second diode is grounded.
9. The debugging device of claim 1, wherein the reverse acquisition module comprises a second microstrip line, a second load matching network, a third diode, and a second detection resistor;
the second microstrip line is coupled with the feeder line, a first end of the second microstrip line is grounded through the second load matching network, and a second end of the second microstrip line is connected with an input end of the third diode;
the output end of the third diode is connected with the control module, and the output end of the third diode is grounded through the second load matching network.
10. The debugging apparatus of claim 9, wherein the reverse acquisition module comprises a second filter capacitor and a fourth diode;
the output end of the third diode is connected with the output end of the fourth diode, and the output end of the third diode is grounded through the second filter capacitor;
the input end of the fourth diode is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320560938.3U CN219420772U (en) | 2023-03-20 | 2023-03-20 | Debugging device of wireless broadcasting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320560938.3U CN219420772U (en) | 2023-03-20 | 2023-03-20 | Debugging device of wireless broadcasting equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219420772U true CN219420772U (en) | 2023-07-25 |
Family
ID=87232731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320560938.3U Active CN219420772U (en) | 2023-03-20 | 2023-03-20 | Debugging device of wireless broadcasting equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219420772U (en) |
-
2023
- 2023-03-20 CN CN202320560938.3U patent/CN219420772U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7757262B2 (en) | CATV system and automatic noise controller | |
| JP3048661B2 (en) | Receiver | |
| CN101282494B (en) | Method for testing receiving performance of digital television receiving terminal | |
| JPH05176329A (en) | Satellite broadcast receiving system | |
| US20080248752A1 (en) | Radio transmission system, transmitter and radio transmission method | |
| CN104702344B (en) | Near field acoustic wave communication method | |
| CN219420772U (en) | Debugging device of wireless broadcasting equipment | |
| US20110092156A1 (en) | Short Range FM Modulator/Transmitter and System Incorporating Same | |
| CN103079161B (en) | Method and system for testing audio port of handheld equipment | |
| US20090047919A1 (en) | Radio with automatic tuning to modulated audio device | |
| US6459408B1 (en) | Satellite receiver and method and apparatus for adjusting the direction of satellite dish antenna | |
| CN203554542U (en) | Audio detection system of mobile terminal | |
| US20110124288A1 (en) | Apparatus and method for automatic wireless link replacement | |
| MXPA03011248A (en) | Method and apparatus for real time testing of dtv antenna transmitting systems in time domain under full power. | |
| CN102932076B (en) | A kind of sensitivity test method based on mobile terminal FM receiver and system | |
| CN113395127B (en) | Emergency broadcast RDS modulation degree test method and system | |
| CN201039324Y (en) | A portable digital TV monitor for automatic digital and analog signal recognition | |
| EP2080281A1 (en) | Short range fm modulator/transmitter and system incorporating same | |
| CN106685556A (en) | Detection apparatus of FM-RDS/DAB signal receiver and detection method of such apparatus | |
| US9360513B2 (en) | Method and system for determining parameters of a satellite signal | |
| CN220964893U (en) | Medium wave transmitter module work indicating device | |
| KR20030006266A (en) | Apparatus and method for diagnostic of RF block by using receiving auto gain control | |
| CN207505062U (en) | Ground digital television single frequency network tester | |
| CN117969953A (en) | Harmonic power detection device | |
| KR101734190B1 (en) | The apparatus of multi test to radio frequency board with broadcast channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |