CN113381821A - Pre-driving level regulating box of broadcast transmitter - Google Patents
Pre-driving level regulating box of broadcast transmitter Download PDFInfo
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- CN113381821A CN113381821A CN202110652786.5A CN202110652786A CN113381821A CN 113381821 A CN113381821 A CN 113381821A CN 202110652786 A CN202110652786 A CN 202110652786A CN 113381821 A CN113381821 A CN 113381821A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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Abstract
The embodiment of the application provides a broadcast transmitter predrive level regulating box for simulating broadcast transmitter predrive level operational environment, include: signal generator, converting circuit, power distribution circuit, adjustable DC circuit. The input end of the signal generator, the input end of the conversion circuit and the input end of the adjustable direct current circuit are respectively connected with an alternating current power supply; the output end of the signal generator is connected with the input end of the power distribution circuit; the output end of the conversion circuit, the output end of the adjustable direct current circuit and the output end of the power distribution circuit are respectively connected with a tested device. The broadcast transmitter predrive level adjusting box claimed by the embodiment of the application can provide a power supply and adjustable negative voltage for a tested device, and simulate the working environment of the high-power broadcast transmitter predrive level, so that the tested device is adjusted and tested, and the reliability of the tested device is improved.
Description
Technical Field
The invention relates to the technical field of broadcast transmitters, in particular to a pre-driving level regulating box of a broadcast transmitter.
Background
The development of information puts more and more requirements on information exchange, radio communication is an efficient and timely information exchange technology, and a high-power broadcast transmitter plays an important role in long-distance information transmission.
The main components of a high-power broadcast transmitter include an exciter, a high-frequency attenuator, a broadband amplifier, an audio processor, and the like. Among them, the exciter generates high-frequency, highly stable carrier signals, has the characteristics of large power, high gain and uniform response in the broadcast frequency band, and plays a very important role in the broadcast transmitter. Therefore, in order to complete the safe broadcasting task in zero seconds with high quality, a pre-driving level adjusting box of the broadcasting transmitter is urgently needed to adjust and test important devices of the broadcasting transmitter and improve the reliability of the important devices of the broadcasting transmitter.
Disclosure of Invention
In view of this, the present invention provides a pre-driving level adjusting box of a broadcast transmitter, which simulates a pre-driving level working environment of the broadcast transmitter, performs adjustment testing on important devices of the broadcast transmitter, and improves reliability of the important devices of the broadcast transmitter.
In order to achieve the purpose, the invention adopts the following technical scheme:
the embodiment of the application provides a broadcast transmitter predrive level regulating box for simulating broadcast transmitter predrive level operational environment, include: the device comprises a signal generator, a conversion circuit, a power distribution circuit and an adjustable direct current circuit;
the input end of the signal generator, the input end of the conversion circuit and the input end of the adjustable direct current circuit are respectively connected with an alternating current power supply;
the output end of the signal generator is connected with the input end of the power distribution circuit;
the output end of the conversion circuit, the output end of the adjustable direct current circuit and the output end of the power distribution circuit are respectively connected with a tested device.
Optionally, the input end of the power distribution circuit is further connected to the first transmission line, the second transmission line, and the fifth microstrip line, respectively;
the first transmission line is connected with the input end of the first resonance unit; the first resonance unit comprises a first capacitor and a first inductor; the output end of the first resonance unit is connected with the input end of the first microstrip line; the output end of the first microstrip line is connected with the input end of the second resonance unit; the second resonance unit comprises a second capacitor and a second inductor; the output end of the second resonance unit is connected with the input end of the second microstrip line; the output end of the second microstrip line is connected with one end of a fifth inductor;
the second transmission line is connected with the input end of the third resonance unit; the third resonance unit comprises a third capacitor and a third inductor; the output end of the third resonance unit is connected with the input end of the third microstrip line; the output end of the third microstrip line is connected with the input end of the fourth resonance unit; the fourth resonance unit comprises a fourth capacitor and a fourth inductor; the output end of the fourth resonance unit is connected with the input end of the fourth microstrip line; and the output end of the fourth microstrip line is connected with the other end of the fifth inductor.
Optionally, the conversion circuit forms an independent unit through a first rectifier diode, a second rectifier diode, a third rectifier diode, a fourth rectifier diode, a fifth capacitor and a sixth capacitor;
the first transformer is connected with the conversion circuit; the negative end of the secondary output of the first transformer is respectively connected with the cathode of the first rectifying diode and the anode of the second rectifying diode;
the positive end of the secondary output of the first transformer is respectively connected with the anode of the third rectifying diode and the cathode of the fourth rectifying diode;
the cathode of the third rectifying diode is respectively connected with the anode of the fifth capacitor and the anode of the sixth capacitor;
and the anode of the fourth rectifying diode is respectively connected with the cathode of the fifth capacitor and the cathode of the sixth capacitor.
Optionally, the adjustable dc circuit includes an independent unit formed by a fifth rectifier diode, a sixth rectifier diode, a seventh rectifier diode, an eighth rectifier diode, a ninth rectifier diode, a tenth rectifier diode, a first resistor, a second resistor, a third resistor, a seventh capacitor, and an eighth capacitor; the adjustable direct current circuit also comprises a voltage stabilizing block; the second transformer is connected with the adjustable direct current circuit; the positive end of the secondary output of the second transformer is respectively connected with the anode of the eighth rectifying diode and the cathode of the seventh rectifying diode;
the negative end of the secondary output of the second transformer is respectively connected with the cathode of the fifth rectifying diode and the anode of the sixth rectifying diode;
the cathode of the eighth rectifying diode is respectively connected with the anode of the seventh capacitor, one end of the first resistor R1, the cathode of the ninth diode and the input end of the voltage stabilizing block;
the negative electrode of the seventh capacitor is connected with the other end of the first resistor;
the ground end of the voltage stabilizing block is connected with one end of the second resistor and connected to the anode of the tenth rectifying diode in parallel;
one end of the third resistor, the anode of the eighth capacitor, the cathode of the tenth rectifying diode and the anode of the ninth rectifying diode are connected in series;
the output end of the voltage stabilizing block is respectively connected with the other end of the third resistor and the anode of the ninth capacitor;
the anode of the fifth rectifying diode, the anode of the seventh rectifying diode, the cathode of the seventh capacitor, the first resistor, the second resistor, the cathode of the seventh capacitor and the negative terminal of the eighth capacitor are connected together and sent to the seventh interface to be used as the output of the negative power supply.
Optionally, the signal generator is configured to generate a high frequency excitation signal.
Optionally, the high-frequency excitation signal ranges from 0.1HZ to 30.00000000000 MHZ.
Optionally, the conversion circuit provides power for the device under test.
Optionally, the adjustable dc circuit provides an adjustable negative voltage for the device under test.
Optionally, the power distribution circuit is configured to generate an attenuated signal.
Optionally, the attenuated signal is a 50 ohm impedance matched radio frequency signal.
The embodiment of the application provides a broadcast transmitter predrive level regulating box for simulating broadcast transmitter predrive level operational environment, include: signal generator, converting circuit, power distribution circuit, adjustable DC circuit. The signal generator provides stable and accurate high-frequency excitation signals for the tested device. And the conversion circuit meets the power supply requirement of the tested device. The adjustable direct current circuit provides adjustable negative voltage for the tested device. And the power distribution circuit generates an attenuation signal to meet the signal input requirement of the tested device. The broadcast transmitter predrive level adjusting box claimed by the embodiment of the application is connected with a tested device, provides a power supply and an adjustable negative voltage for the tested device, and can simulate the working environment of the high-power broadcast transmitter predrive level, so that the tested device is adjusted and tested, and the reliability of the tested device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a circuit principle of a pre-driving stage tuning box of a broadcast transmitter according to an embodiment of the present application;
fig. 2 is a schematic diagram of an external connection of a pre-driving level tuning box of a broadcast transmitter according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The broadcast transmitter pre-drive level adjusting box provided by the embodiment of the application is composed of a signal generator, a conversion circuit, a power distribution circuit and an adjustable direct current circuit, a 220VAC alternating current power supply is adopted for power supply processing, and specifically, the input end of the signal generator, the input end of the conversion circuit and the input end of the adjustable direct current circuit are respectively connected with the alternating current 220VAC power supply; the output end of the signal generator is connected with the input end of the power distribution circuit; the output end of the conversion circuit, the output end of the adjustable direct current circuit and the output end of the power distribution circuit are respectively connected with the tested device to provide a power supply and an adjustable negative voltage for the tested device.
Fig. 1 is a schematic diagram of a circuit principle of a pre-driving stage tuning box of a broadcast transmitter according to an embodiment of the present invention, specifically, as shown in fig. 1, a positive electrode of an input power of a signal generator is connected to an L terminal of an external port, and a negative electrode of the input power of the signal generator is connected to an N terminal of the external port; the output end J1 of the signal generator is connected with the input end J2 of the power distribution circuit, and the input end J2 of the power distribution circuit is also connected with the first transmission line TL1, the second transmission line TL2 and the fifth microstrip line TL7 respectively; a first transmission line TL1 is connected to an input of the first resonator element; the first resonance unit is composed of a first capacitor C1 and a first inductor L1; the output end of the first resonance unit is connected with the input end of a first microstrip line TL 3; the output end of the first microstrip line TL3 is connected with the input end of the second resonance unit; the second resonance unit is composed of a second capacitor C2 and a second inductor L2; the output end of the second resonance unit is connected with the input end of a second microstrip line TL 4; the output end of the second microstrip line TL4 is connected with one end of the fifth inductor L5;
the second transmission line TL2 is connected to the input of the third resonator element; the third resonant unit is composed of a third capacitor C3 and a third inductor L3; the output end of the third resonance unit is connected with the input end of a third microstrip line TL 5; the output end of the third microstrip line TL5 is connected with the input end of the fourth resonance unit; the fourth resonance unit is composed of a fourth capacitor C4 and a fourth inductor L4; the output end of the fourth resonance unit is connected with the input end of a fourth microstrip line TL 5; the output end of the fourth microstrip line TL5 is connected to the other end of the fifth inductor L5, and finally outputs two paths of radio frequency signals to the ports J3 and J4.
As an alternative embodiment, the transforming circuit forms an independent unit through a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3, a fourth rectifying diode D4, a fifth capacitor C5 and a sixth capacitor C6.
Specifically, the positive electrode of the ac 220VAC power supply is connected to one end of the primary coil of the first transformer T1, and the negative electrode of the ac 220VAC power supply is connected to the other end of the primary coil of the first transformer T1; the negative secondary output terminal of the first transformer T1 is connected to the cathode of the first rectifying diode D1 and the anode of the second rectifying diode D2, respectively; the positive secondary output terminal of the first transformer T1 is connected to the anode of the third rectifying diode D3 and the cathode of the fourth rectifying diode D4, respectively; the cathode of the third rectifier diode D3 is connected to the anode of the fifth capacitor C5 and the anode of the sixth capacitor C6, respectively, and outputs +28V dc power, and the anode of the fourth rectifier diode D4 is connected to the cathode of the fifth capacitor C5 and the cathode of the sixth capacitor C6, respectively, and is grounded and connected to the output ports J5 and J6.
As an alternative embodiment, the adjustable dc circuit includes an independent unit composed of a fifth rectifier diode D5, a sixth rectifier diode D6, a seventh rectifier diode D7, an eighth rectifier diode D8, a ninth rectifier diode D9, a tenth rectifier diode D10, a first resistor R1, a second resistor R2, a third resistor R3, a seventh capacitor C7, and an eighth capacitor C8.
Specifically, the adjustable direct current circuit further comprises a voltage stabilizing block; the positive pole of the power supply of alternating current 220VAC is connected with one end of the primary coil of the second transformer T2, and the negative pole of the power supply of alternating current 220VAC is connected with the other end of the primary coil of the second transformer T2; the positive end of the secondary output of the second transformer T2 is connected to the anode of the eighth rectifying diode D8 and the cathode of the seventh rectifying diode D7, respectively; the negative output terminal of the second transformer T2 is connected to the cathode of the fifth rectifier diode D5 and the anode of the sixth rectifier diode D6, respectively; the cathode of the eighth rectifying diode D8 is connected with the anode of the seventh capacitor C7, one end of the first resistor R1, the cathode of the ninth diode D9 and the input end of the voltage stabilizing block LM respectively; the negative electrode of the seventh capacitor is connected with the other end of the first resistor R1; the ground end of the voltage stabilizing block LM is connected with one end of a second resistor R2 and is connected to the anode of a tenth rectifying diode D10 in parallel; one end of the third resistor R3, the anode of the eighth capacitor C8, the cathode of the tenth rectifier diode D10 and the anode of the ninth rectifier diode D9 are connected in series; the output end of the voltage stabilizing block LM is respectively connected with the other end of the third resistor R3 and the anode of the ninth capacitor C9; the anode of the fifth rectifier diode D5, the anode of the seventh rectifier diode D7, the cathode of the seventh capacitor C7, the first resistor R1, the second resistor R2, the cathode of the seventh capacitor C7, and the cathode of the eighth capacitor C8 are connected together, and input to the interfaces J7 and J8 as the output of the negative power supply.
Fig. 2 is a schematic diagram of an external connection of a broadcast transmitter predrive stage modulation box according to an embodiment of the present application, and as shown in fig. 2, a device under test may be: a broadband amplifier (BBA), an automatic gain Amplifier (AGC), and an oscilloscope; specifically, the external connection relationship between the pre-driving stage regulation box of the broadcast transmitter and the device under test may be as follows:
the interface J3 of the pre-driving level adjusting box of the broadcast transmitter outputs a sine high-frequency signal which is connected with the excitation input end J1 of the broadband signal amplifier;
the output end J2 of the broadband signal amplifier is connected with the signal acquisition end J1 of the oscilloscope;
the interface J4 of the test box outputs a sine high-frequency signal to be connected with the excitation input end JI of the automatic gain amplifier;
the interface J5 of the test box is respectively connected with the end 1 of the grounding end of the automatic gain amplifier and the end 2 of the grounding end of the broadband signal amplifier;
the interface J6 of the test box outputs +28VDC to be connected with the 2 end of the power supply end of the automatic gain amplifier;
the interface J7 of the test box outputs negative voltage to be connected with the end 5 of the automatic gain amplifier;
the interface J8 of the test box outputs negative voltage to be connected with the end 6 of the automatic gain amplifier;
the output end J2 of the automatic gain amplifier is connected with the signal collecting end J2 of the oscilloscope.
As an optional embodiment, the signal generator in the pre-drive level regulation box of the broadcast transmitter in the embodiment of the application adopts natural ventilation cooling, generates 0.1HZ to 30.00000000000MHZ radio frequency carrier signals, displays the radio frequency carrier signals by 13-bit numbers, outputs 50 ohms of impedance, outputs 1mv to 10v of level and 20mw of maximum output power, and controls the frequency by adopting a numeric keyboard input mode. The signal generator of the pre-driving stage regulating box of the broadcast transmitter provides stable and accurate high-frequency excitation signals for the automatic gain controller and the broadband amplifier.
As an alternative embodiment, the broadcast transmitter pre-driving stage regulation box in the embodiment of the present application uses two sets of power supplies: (1) the conversion circuit is connected with an alternating current power supply to convert alternating current 230V into direct current +28VDC, so that the requirements of the power supply of the automatic gain controller and the broadband amplifier are met. (2) The adjustable direct current circuit is connected with an alternating current power supply, alternating current 230V is changed into-1.25V to-37V, and the sampling voltage values of high front negative current and high rear grid current of the automatic gain controller are met through wiring.
As an optional embodiment, an input end of a power distribution circuit of a pre-driving stage regulation box of a broadcast transmitter in the embodiment of the present application is connected to an output end of a signal generator, so as to generate 2 paths of attenuated 50-ohm impedance-matched radio frequency signals, thereby meeting the signal input requirements of an automatic gain controller and a broadband amplifier.
The broadcast transmitter predrive level adjusting box meets the radio frequency excitation predrive level adjusting and testing function of a high-power broadcast transmitter, increases the adjusting and testing of spare parts and repair components, and ensures the reliability of key spare parts of the high-power broadcast transmitter. By refining the principle of the radio frequency path of the transmitter, the problems that the transmitter is off and excited to fail and the trouble and time are wasted in processing the fault are solved, the requirement of maintenance skills of operation and maintenance personnel is met, and the fault processing capability of the operation and maintenance personnel is enhanced by performing point-by-point waveform analysis according to the fault phenomenon.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "first", "second", "third", "fourth", and the like are used merely for distinguishing between descriptions and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A kind of broadcast transmitter drives the level and regulates the case in advance, is used for simulating the broadcast transmitter drives the level working environment in advance, characterized by that, comprising: the device comprises a signal generator, a conversion circuit, a power distribution circuit and an adjustable direct current circuit;
the input end of the signal generator, the input end of the conversion circuit and the input end of the adjustable direct current circuit are respectively connected with an alternating current power supply;
the output end of the signal generator is connected with the input end of the power distribution circuit;
the output end of the conversion circuit, the output end of the adjustable direct current circuit and the output end of the power distribution circuit are respectively connected with a tested device.
2. The tuning box of pre-driving stage of broadcasting transmitter as claimed in claim 1, wherein the input terminal of the power distribution circuit is further connected to the first transmission line, the second transmission line, and the fifth microstrip line, respectively;
the first transmission line is connected with the input end of the first resonance unit; the first resonance unit comprises a first capacitor and a first inductor; the output end of the first resonance unit is connected with the input end of the first microstrip line; the output end of the first microstrip line is connected with the input end of the second resonance unit; the second resonance unit comprises a second capacitor and a second inductor; the output end of the second resonance unit is connected with the input end of the second microstrip line; the output end of the second microstrip line is connected with one end of a fifth inductor;
the second transmission line is connected with the input end of the third resonance unit; the third resonance unit comprises a third capacitor and a third inductor; the output end of the third resonance unit is connected with the input end of the third microstrip line; the output end of the third microstrip line is connected with the input end of the fourth resonance unit; the fourth resonance unit comprises a fourth capacitor and a fourth inductor; the output end of the fourth resonance unit is connected with the input end of the fourth microstrip line; and the output end of the fourth microstrip line is connected with the other end of the fifth inductor.
3. The tuning box of pre-driving stage of broadcast transmitter in claim 1, wherein the transforming circuit comprises an independent unit consisting of a first rectifying diode, a second rectifying diode, a third rectifying diode, a fourth rectifying diode, a fifth capacitor and a sixth capacitor;
the first transformer is connected with the conversion circuit; the negative end of the secondary output of the first transformer is respectively connected with the cathode of the first rectifying diode and the anode of the second rectifying diode;
the positive end of the secondary output of the first transformer is respectively connected with the anode of the third rectifying diode and the cathode of the fourth rectifying diode;
the cathode of the third rectifying diode is respectively connected with the anode of the fifth capacitor and the anode of the sixth capacitor;
and the anode of the fourth rectifying diode is respectively connected with the cathode of the fifth capacitor and the cathode of the sixth capacitor.
4. The tuning box of pre-driver stage of a broadcasting transmitter as claimed in claim 3, wherein the adjustable DC circuit comprises an independent unit consisting of a fifth rectifying diode, a sixth rectifying diode, a seventh rectifying diode, an eighth rectifying diode, a ninth rectifying diode, a tenth rectifying diode, a first resistor, a second resistor, a third resistor, a seventh capacitor and an eighth capacitor;
the adjustable direct current circuit also comprises a voltage stabilizing block; the second transformer is connected with the adjustable direct current circuit; the positive end of the secondary output of the second transformer is respectively connected with the anode of the eighth rectifying diode and the cathode of the seventh rectifying diode;
the negative end of the secondary output of the second transformer is respectively connected with the cathode of the fifth rectifying diode and the anode of the sixth rectifying diode;
the cathode of the eighth rectifying diode is respectively connected with the anode of the seventh capacitor, one end of the first resistor R1, the cathode of the ninth diode and the input end of the voltage stabilizing block;
the negative electrode of the seventh capacitor is connected with the other end of the first resistor;
the ground end of the voltage stabilizing block is connected with one end of the second resistor and connected to the anode of the tenth rectifying diode in parallel;
one end of the third resistor, the anode of the eighth capacitor, the cathode of the tenth rectifying diode and the anode of the ninth rectifying diode are connected in series;
the output end of the voltage stabilizing block is respectively connected with the other end of the third resistor and the anode of the ninth capacitor;
and the anode of the fifth rectifying diode is respectively connected with the anode of the seventh rectifying diode, the cathode of the seventh capacitor, the first resistor, the second resistor, the cathode of the seventh capacitor and the negative end of the eighth capacitor to be used as the output of the negative power supply.
5. The broadcast transmitter predrive stage regulation box of claim 1, wherein the signal generator provides a high frequency excitation signal to a device under test.
6. The broadcast transmitter pre-drive stage regulation box of claim 5, wherein the high frequency excitation signal ranges from 0.1Hz to 30.00000000000 MHz.
7. The broadcast transmitter pre-driver stage regulation box of claim 1, wherein the transformation circuit provides power to a device under test.
8. The broadcast transmitter predrive stage regulation box of claim 1, wherein the adjustable dc circuit provides an adjustable negative voltage to a device under test.
9. The broadcast transmitter pre-drive stage regulation box of claim 1, wherein the power distribution circuit is configured to generate an attenuated signal.
10. The broadcast transmitter pre-drive stage regulation box of claim 9, wherein the attenuated signal is a 50 ohm impedance matched radio frequency signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110652786.5A CN113381821B (en) | 2021-06-11 | 2021-06-11 | Pre-driving level regulating box of broadcast transmitter |
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| CN202110652786.5A CN113381821B (en) | 2021-06-11 | 2021-06-11 | Pre-driving level regulating box of broadcast transmitter |
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| CN113381821B CN113381821B (en) | 2023-01-31 |
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| CN113381821B (en) | 2023-01-31 |
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