CN113313991A - Short-wave radio station teaching system capable of conducting fault diagnosis training - Google Patents
Short-wave radio station teaching system capable of conducting fault diagnosis training Download PDFInfo
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- CN113313991A CN113313991A CN202110634307.7A CN202110634307A CN113313991A CN 113313991 A CN113313991 A CN 113313991A CN 202110634307 A CN202110634307 A CN 202110634307A CN 113313991 A CN113313991 A CN 113313991A
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- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
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Abstract
The invention belongs to the technical field of radio stations and discloses a short-wave radio station teaching system capable of performing fault diagnosis training. Including the demonstrating board, circuit module, be provided with a plurality of windows on the demonstrating board, the window is arranged in the circuit diagram that shows among the circuit module function module corresponds, be provided with signal flow display lamp between the window, a transmission condition for signal among the display point circuit module, be equipped with a plurality of signal test interface on the demonstrating board, a signal for testing corresponding module output, circuit module is connected with a plurality of trouble and sets up the button, the trouble sets up the trouble that the button is arranged in triggering circuit module and corresponds function module, be equipped with the display screen on the demonstrating board, a current fault condition is used for showing. The system adopts an open type modular circuit design, simplifies complex design details according to the radio station receiving and signaling flow and the basic principle of a radio station circuit, and constructs a simplex short wave communication system with sound basic function and clear structure.
Description
Technical Field
The invention belongs to the technical field of radio stations, and particularly relates to a short-wave radio station teaching system capable of performing fault diagnosis training.
Background
At present, radio station equipment mostly adopts to integrate, the modularized design, can not make the student have comparatively audio-visual understanding to its theory of operation through the disassembling to the equipment in the teaching, causes the damage to equipment on the contrary easily, in order to improve the level of radio station principle teaching and maintenance skill training, perfect laboratory construction, reduce the training cost, need a shortwave radio station teaching system that can carry out the fault diagnosis training.
Disclosure of Invention
In order to solve the technical problems, the invention provides a system which can completely demonstrate the working principle of a short-wave radio station and can also carry out fault diagnosis training.
The technical scheme adopted by the invention is as follows: the utility model provides a shortwave radio teaching system that can carry out failure diagnosis training, includes demonstrating board, circuit module, be provided with a plurality of windows on the demonstrating board, the window is arranged in showing the circuit diagram that function module corresponds among the circuit module, be provided with signal flow display lamp between the window for the transmission condition of signal among the point circuit module of demonstration, be equipped with a plurality of signal test interfaces on the demonstrating board for the signal that the test corresponds the module output, circuit module is connected with a plurality of trouble and sets up the button, the trouble sets up the trouble that the button is arranged in triggering circuit module to correspond function module, be equipped with the display screen on the demonstrating board for show current fault status.
Further, the circuit module includes a transmitter module and a receiver module, the transmitter module includes:
the audio acquisition unit is used for acquiring an audio signal and converting the audio signal into a sinusoidal signal;
the first low-frequency amplifier module is electrically connected with the output end of the audio acquisition unit and is used for amplifying the sinusoidal signal;
the low-pass filter module is electrically connected with the output end of the first low-frequency amplifier module and is used for filtering the sinusoidal signal;
the modulator module is electrically connected with the output end of the low-pass filter module and is used for modulating the sinusoidal signal into a modulation signal;
a first oscillator module for generating an oscillation signal;
the mixer module is electrically connected with the output end of the modulator module and the output end of the first oscillator module and is used for generating an amplitude modulation signal from the modulation signal and the oscillation signal;
the first band-pass filter module is electrically connected with the output end of the frequency mixer module and is used for filtering the amplitude-modulated signal;
the first high-frequency amplifier module is electrically connected with the output end of the first band-pass filter module and is used for amplifying amplitude-modulated signals;
and the radio frequency antenna is electrically connected with the output end of the first high-frequency amplifier module and is used for sending signals.
Further, the low-pass filter module is connected with a first fault setting button, and the first fault setting button is used for changing the cut-off frequency of the low-pass filter to enable the low-pass filter module to output no signal;
the modulator module is connected with a second fault setting button, and the second fault setting button is used for reducing the sinusoidal signal input into the modulator module so that the output signal has no wrapped-up rockwave;
the first oscillator module is connected with a third fault setting button, and the third fault setting button is used for reducing the bias voltage of a static working point, so that the oscillation of the oscillation tube is stopped, and the oscillator outputs no signal;
the mixer module is connected with a fourth fault setting button, and the fourth fault setting button is used for reducing a modulation signal so that the mixer outputs no signal;
the first band-pass filter module is connected with a fifth fault setting button, and the fifth fault setting button is used for switching the filtering frequency of the first band-pass filter module, so that the first band-pass filter module outputs no signal.
Further, the receiver module comprises:
the receiving antenna is used for receiving the signal sent by the radio frequency antenna and outputting an amplitude modulation signal;
the second high-frequency amplifier module is electrically connected with the receiving antenna and used for amplifying the amplitude-modulated signal;
a second oscillator module for generating an oscillation signal;
the down converter module is electrically connected with the output end of the second high-frequency amplifier module and the output end of the second oscillator module and is used for reducing the frequency of the amplitude-modulated signal;
the second band-pass filter module is electrically connected with the output end of the down converter module and is used for filtering the amplitude-modulated signal;
the demodulator module is electrically connected with the output end of the second band-pass filter module and is used for converting the amplitude-modulated signal into a sinusoidal signal;
the second low-frequency amplifier module is electrically connected with the output end of the demodulator module and is used for amplifying the sinusoidal signal;
and the loudspeaker is electrically connected with the output end of the second low-frequency amplifier module.
Further, the second high-frequency amplifier module is connected with a sixth fault setting button, and the sixth fault setting button is used for reducing the amplification factor of the second high-frequency amplifier module so that the output signal is smaller than the original signal;
the second oscillator module is connected with a seventh fault setting button, and the seventh fault setting button is used for short-circuiting a radio frequency output line and a shielding line of the second oscillator module so as to output no signal;
the second band-pass filter module is connected with an eighth fault setting button, and the eighth fault setting button is used for switching the filtering frequency of the second band-pass filter module so that the second band-pass filter module outputs no signal;
the demodulator module is connected with a ninth fault setting button, and the ninth fault setting button is used for switching demodulated synchronous carrier frequency, so that the demodulator module outputs no signal.
Furthermore, an LC resonance circuit is connected between two stages of circuits with overlarge loss in the circuit module and is used for impedance conversion, so that the problem of overlarge loss is reduced.
The invention has the beneficial effects that: the system adopts an open type modular circuit design, simplifies complex design details according to the radio station receiving and signaling flow and the basic principle of a radio station circuit, and constructs a simplex short wave communication system with sound basic function and clear structure. Principle teaching and fault diagnosis training are carried out based on the system, pertinence is strong, the thought of a student is clearer, the teaching of the short-wave radio station principle is well promoted, the student is easily helped to deepen understanding of the principle, fault phenomena are combined, the principle is contrasted, the analysis thought is cleared, and the fault removing capability is improved.
Drawings
FIG. 1 is a schematic view of a teaching board according to the present invention;
FIG. 2 is a schematic diagram of a transmitter according to the present invention;
fig. 3 is a schematic diagram of a receiver structure according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1: as shown in fig. 1 to 3, the teaching board of the present invention includes a teaching board and a circuit module, wherein the circuit module includes a transmitter module and a receiver module, and the transmitter module includes: the audio acquisition unit is used for acquiring an audio signal and converting the audio signal into a sinusoidal signal; the first low-frequency amplifier module is electrically connected with the output end of the audio acquisition unit and is used for amplifying the sinusoidal signal; the low-pass filter module is electrically connected with the output end of the first low-frequency amplifier module and is used for filtering the sinusoidal signal; the modulator module is electrically connected with the output end of the low-pass filter module and is used for modulating the sinusoidal signal into a modulation signal; a first oscillator module for generating an oscillation signal; the mixer module is electrically connected with the output end of the modulator module and the output end of the first oscillator module and is used for generating an amplitude modulation signal from the modulation signal and the oscillation signal; the first band-pass filter module is electrically connected with the output end of the frequency mixer module and is used for filtering the amplitude-modulated signal; the first high-frequency amplifier module is electrically connected with the output end of the first band-pass filter module and is used for amplifying amplitude-modulated signals; and the radio frequency antenna is electrically connected with the output end of the first high-frequency amplifier module and is used for sending signals. The receiver module includes: the receiving antenna is used for receiving the signal sent by the radio frequency antenna and outputting an amplitude modulation signal; the second high-frequency amplifier module is electrically connected with the receiving antenna and used for amplifying the amplitude-modulated signal; a second oscillator module for generating an oscillation signal; the down converter module is electrically connected with the output end of the second high-frequency amplifier module and the output end of the second oscillator module and is used for reducing the frequency of the amplitude-modulated signal; the second band-pass filter module is electrically connected with the output end of the down converter module and is used for filtering the amplitude-modulated signal; the demodulator module is electrically connected with the output end of the second band-pass filter module and is used for converting the amplitude-modulated signal into a sinusoidal signal; the second low-frequency amplifier module is electrically connected with the output end of the demodulator module and is used for amplifying the sinusoidal signal; and the loudspeaker is electrically connected with the output end of the second low-frequency amplifier module.
As shown in fig. 1, each functional module corresponds to a window 11, the windows 11 are disposed on a teaching board for displaying a circuit diagram of the module, and signal flow display lamps 13 are disposed between the modules connected to each other, and are specifically disposed between the windows 11 of the teaching board for displaying transmission conditions of signals in the circuit modules. The signal flow display lamp 13 is correspondingly provided with a signal test interface 12 nearby, the signal test interface 12 is connected with the output end of the module and used for testing the signal value output by the module, the circuit module is connected with a plurality of fault setting buttons, and the fault setting buttons are arranged on the teaching board and used for triggering faults of corresponding functional modules in the circuit module. And the teaching board is provided with a display screen 14 for displaying the current fault state.
The low-pass filter module is connected with a first fault setting button 1, and the first fault setting button 1 is used for changing the cut-off frequency of the low-pass filter to enable the low-pass filter module to output no signal; the modulator module is connected with a second fault setting button 2, and the second fault setting button 2 is used for reducing a sinusoidal signal input into the modulator module so that an output signal has no wrapped-lode wave; the first oscillator module is connected with a third fault setting button 3, and the third fault setting button 3 is used for reducing the bias voltage of a static working point, so that the oscillation tube stops oscillating, and the oscillator outputs no signal; the mixer module is connected with a fourth fault setting button 4, and the fourth fault setting button 4 is used for reducing a modulation signal so that the mixer outputs no signal; the first band-pass filter module is connected with a fifth fault setting button 5, and the fifth fault setting button 5 is used for switching the filtering frequency of the first band-pass filter module, so that the first band-pass filter module outputs no signal. The second high-frequency amplifier module is connected with a sixth fault setting button 6, and the sixth fault setting button 6 is used for reducing the amplification factor of the second high-frequency amplifier module so that the output signal is smaller than the original signal; the second oscillator module is connected with a seventh fault setting button 7, and the seventh fault setting button 7 is used for short-circuiting a radio frequency output line and a shielding line of the second oscillator module so as to output no signal; the second band-pass filter module is connected with an eighth fault setting button 8, and the eighth fault setting button 8 is used for switching the filtering frequency of the second band-pass filter module so that the second band-pass filter module outputs no signal; the demodulator module is connected with a ninth failure setting button 9, and the ninth failure setting button 9 is used for switching the demodulated synchronous carrier frequency, so that the demodulator module outputs no signal. The first to ninth failure control buttons are all provided on the teaching board.
According to the invention, the collected audio is made into a 1.8kHz 400mV sinusoidal signal through the audio collection unit, and the sinusoidal signal with 1.8kHz 3V is amplified through the first low-frequency amplifier module. Then filtering is carried out through a low-pass filter module, a sinusoidal signal of 1.8kHz and 2.8V is output, if a first fault setting button 1 is pressed to enter a fault 1, and the cut-off frequency of the low-pass filter module selects 1kHz, the low-pass filter module has no output signal. The 1.8kHz 2.8V sine signal can be modulated into a 465kHz 300mv modulation signal through the modulator module, if the second fault setting button 2 is pressed, a fault 2 is entered, the sine signal input into the modulator module is reduced at the moment, the 1.8kHz sine signal is set to be too small, so that the modulation AM output is the 465kHz sine signal, and no packet of rockwave exists. When the frequency mixer is normal, a modulation signal of 300mV at 65kHz enters a frequency mixer module, a 4.965MHz 500mV sinusoidal signal generated by a first oscillator module is matched to form a 4.5MHz 200mV amplitude modulation signal, a three-point LC oscillator is adopted by the first oscillator module, if a third failure setting button 3 is pressed, a failure 3 is entered, an oscillating tube is set to stop oscillating, the static working point offset voltage is too low, so that no signal is output by the oscillator module, and if a fourth failure setting button 4 is pressed, a failure 4 is entered, the AM output signal is reduced, so that no signal is output by frequency mixing. When the filter is normal, the 4.5MHz 200mV amplitude modulation signal enters the first band-pass filter module for filtering, if the fifth fault control button is pressed, the fault 5 is entered, the first band-pass filter module is switched to 6MHz, the 4.5MHz signal cannot be filtered, and the band-pass filter outputs no signal. When the radio frequency antenna is normal, the 4.5MHz 200mV amplitude modulation signal output from the first band-pass filter module enters the first high-frequency amplifier module, is amplified into a 4.5MHz 500mV amplitude modulation signal, and then is transmitted through the radio frequency antenna.
And then a receiving antenna of the receiver module receives a signal sent by the radio frequency antenna, outputs an amplitude modulation signal of 10.7MHz and 200mV, amplifies the signal by the second high-frequency amplifier module, and if a sixth fault setting button 6 is pressed at the moment, the signal enters a fault six state, the set amplification factor is insufficient, and the amplification output of the high-frequency power amplifier is smaller than that of the original signal. During normal operation, 400mV amplitude modulation signal of 10.7MHz enters the down-conversion module, and outputs a 300mV amplitude modulation signal of 4.5MHz in cooperation with a 500mV sinusoidal signal of 6.2MHz output by the second oscillation module, at the moment, a seventh fault setting button is pressed, a fault 7 is entered, and the output of the radio frequency line of the oscillator is connected with the shielding line, so that no signal is output. When the filter operates normally, the amplitude modulation signal of 4.5MHz300mV is filtered through the second band-pass filter module, the amplitude modulation signal of 4.5MHz 200mV is output, at this time, if the eighth fault setting button 8 is pressed, a fault 8 is entered, and 3MHz of the band-pass filter is set, so that no signal is output from the band-pass filter. In normal operation, the 4.5MHz 200mV amplitude modulation signal enters the demodulator to demodulate and output a 1.8kHz 100mV sine signal, if the ninth failure setting button 9 is pressed, a failure 9 is entered, the synchronous carrier of coherent demodulation selects 10.7MHz, and the actual signal 4.5MHz amplitude modulation signal causes no signal output in demodulation. In normal operation, a 1.8kHz 100mV sinusoidal signal enters the second low frequency amplifier module, and a 1.8kHz 3V sinusoidal signal is output and then played through a loudspeaker.
In order to make the teaching and training examination system close to the actual installation as much as possible, the circuit structure and the working flow of the digital short-wave radio station are systematically analyzed, and the most basic functional circuit and the most fault-prone module in the transceiver of the radio station are determined. According to the requirement of professional cultivation of wireless communication engineering, the implementation is necessarily simplified on a circuit, and a short-wave radio station principle model is established according to the flows of signal amplification, modulation, frequency conversion, filtering and the like and is used as the basis of system design.
In order to enable the teaching training examination system to have the antenna audio receiving and transmitting functions, a high-frequency circuit design is required; in order to make the working principle of the radio station show more clearly and the circuit measurement more convenient, an open circuit design is required. The open design of the high-frequency circuit has higher requirements on matching and compatibility between circuit modules, and if impedance between front and rear two stages of circuits is not matched, excessive loss and reflection interference of signal transmission are easily caused, and the realization of circuit functions is seriously influenced. In the process of designing and building the system, the matching performance among all circuit modules must be analyzed and researched, and a matching circuit is designed between two stages of circuits if necessary. High-frequency circuits often show different states in no-load and load states, and a circuit system formed by combining multiple stages of modules often fails due to the fact that functional modules are mismatched. For the convenience of principle demonstration, the system adopts a modular design, so that the matching problem among modules needs to be solved.
The solution is as follows: before all modules are designed, corresponding circuit simulation is carried out, and input and output impedances of circuits at each stage are estimated. After the circuit modules are manufactured and connected with each other, the loss of signals is measured in a segmented mode and is compared with the loss calculated in a theoretical mode, if the loss is too large, impedance conversion is carried out between the two stages of circuits through the LC resonance circuit which is partially connected in (the problem of too large loss is solved by means of impedance conversion through the method that the LC resonance circuit is partially connected between the two stages of circuits).
After the system is developed, the signal of a key node is sampled according to the normal state and the fault state of the system, the recorded data is contrastively analyzed, the changes of system parameters, signal waveforms and communication quality under different states are inspected, and the corresponding relation between the radio station actual installation fault state and the fault state set by the system is verified.
The teaching training and examination system mainly comprises the following requirements:
(1) the signal flow of the digital radio station can be completely demonstrated;
(2) the separable module tests the key parameter change of the input and output signals;
(3) the working process of the digital radio can be completely simulated, and the wireless receiving and transmitting of the audio signal can be realized;
(4) the trainees can randomly set fault points to diagnose and eliminate common faults of the radio station for the trainees.
Innovation and progress point
1. Circuit redundancy design
High frequency circuits have the characteristics of poor stability, easy damage and the like, and a state that the function of the whole circuit is failed can be caused when the aging or the accidental damage of individual elements frequently occurs (especially when the aging or the accidental damage of the individual elements occurs). To avoid this, the subject group performs redundant design of critical elements and vulnerable devices in circuit design. For example, a broadband power amplifier based on an integrated circuit and a high-frequency power amplifier based on an independent element are manufactured on the same circuit board, the functions of the two amplifiers can be replaced, but the two amplifiers have different properties (due to the operation of the two amplifiers), the possibility of simultaneous failure is greatly reduced, and the working stability of the whole system is ensured.
2. Open modular circuit design
At present, the short-wave radio adopts the design of picture peg formula modularization circuit, but its circuit module integrates the degree higher to it is relative closed, be unfavorable for the teaching show of circuit principle. The system adopts an open type modular circuit design, simplifies complex design details according to the radio station receiving and signaling flow and the basic principle of a radio station circuit, and constructs a simplex short wave communication system with sound basic function and clear structure. Principle teaching and fault diagnosis training are carried out based on the system, pertinence is strong, the thought of a student is clearer, the teaching of the short-wave radio station principle is well promoted, the student is easily helped to deepen understanding of the principle, fault phenomena are combined, the principle is contrasted, the analysis thought is cleared, and the fault removing capability is improved.
The basic structure and the working principle of the short-wave radio station are the knowledge that a radio station operating dialer must master, and are the basic functions of radio station maintenance personnel, but because the working principle of the communication equipment is abstract, the circuit integration degree is high, and the problem is a well-recognized difficulty in both academia education and training. The short-wave radio station principle teaching and fault diagnosis training system developed by the project is based on the test tube teaching method principle of' interior principle simplification and exterior characteristic refinement, and applies a method principle of combining completeness, converts the interior principle into the exterior characteristic, and combines principle demonstration and operation practice effects, so that the teaching quality of related courses can be effectively improved, and the construction of a wireless communication laboratory is further perfected. The system can also be used for training and teaching of primary test tubes of the primary communication wireless communication specialty.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a short wave radio teaching system that fault diagnosis training can carry out, a serial communication port, including demonstrating board, circuit module, be provided with a plurality of windows (11) on the demonstrating board, window (11) are arranged in showing the circuit diagram that function module corresponds among the circuit module, be provided with signal flow display lamp (13) between window (11) for the transmission condition of signal among the display circuit module, be equipped with a plurality of signal test interface (12) on the demonstrating board for the signal of corresponding module output of test, circuit module is connected with a plurality of trouble and sets up the button, the trouble sets up the button and sets up on the demonstrating board, is arranged in triggering circuit module to correspond the trouble of function module, be equipped with display screen (14) on the demonstrating board for show current fault status.
2. The short wave radio teaching system capable of fault diagnosis training of claim 1 wherein the circuit module comprises a transmitter module and a receiver module.
3. The short wave radio teaching system capable of fault diagnosis training of claim 2 wherein the transmitter module comprises:
the audio acquisition unit is used for acquiring an audio signal and converting the audio signal into a sinusoidal signal;
the first low-frequency amplifier module is electrically connected with the output end of the audio acquisition unit and is used for amplifying the sinusoidal signal;
the low-pass filter module is electrically connected with the output end of the first low-frequency amplifier module and is used for filtering the sinusoidal signal;
the modulator module is electrically connected with the output end of the low-pass filter module and is used for modulating the sinusoidal signal into a modulation signal;
a first oscillator module for generating an oscillation signal;
the mixer module is electrically connected with the output end of the modulator module and the output end of the first oscillator module and is used for generating an amplitude modulation signal from the modulation signal and the oscillation signal;
the first band-pass filter module is electrically connected with the output end of the frequency mixer module and is used for filtering the amplitude-modulated signal;
the first high-frequency amplifier module is electrically connected with the output end of the first band-pass filter module and is used for amplifying amplitude-modulated signals;
and the radio frequency antenna is electrically connected with the output end of the first high-frequency amplifier module and is used for sending signals.
4. A short wave radio teaching system capable of fault diagnosis training according to claim 3, wherein the low pass filter module is connected with a first fault setting button (1), the first fault setting button (1) is arranged on the teaching board for changing the cut-off frequency of the low pass filter to make the low pass filter module output no signal;
the modulator module is connected with a second fault setting button (2), and the second fault setting button (2) is arranged on the teaching board and used for reducing sinusoidal signals input into the modulator module so that output signals do not have a wrap-up wave;
the first oscillator module is connected with a third fault setting button (3), and the third fault setting button (3) is arranged on the demonstration board and used for reducing the bias voltage of a static working point, so that the oscillation tube stops oscillating, and the oscillator outputs no signal;
the mixer module is connected with a fourth fault setting button (4), and the fourth fault setting button (4) is arranged on the teaching board and used for reducing the modulation signal so that the mixer outputs no signal;
the first band-pass filter module is connected with a fifth fault setting button (5), and the fifth fault setting button (5) is arranged on the teaching board and used for switching the filtering frequency of the first band-pass filter module, so that the first band-pass filter module outputs no signal.
5. The short wave radio teaching system capable of fault diagnosis training of claim 2 wherein the receiver module comprises:
the receiving antenna is used for receiving the signal sent by the radio frequency antenna and outputting an amplitude modulation signal;
the second high-frequency amplifier module is electrically connected with the receiving antenna and used for amplifying the amplitude-modulated signal;
a second oscillator module for generating an oscillation signal;
the down converter module is electrically connected with the output end of the second high-frequency amplifier module and the output end of the second oscillator module and is used for reducing the frequency of the amplitude-modulated signal;
the second band-pass filter module is electrically connected with the output end of the down converter module and is used for filtering the amplitude-modulated signal;
the demodulator module is electrically connected with the output end of the second band-pass filter module and is used for converting the amplitude-modulated signal into a sinusoidal signal;
the second low-frequency amplifier module is electrically connected with the output end of the demodulator module and is used for amplifying the sinusoidal signal;
and the loudspeaker is electrically connected with the output end of the second low-frequency amplifier module.
6. The short wave radio teaching system capable of fault diagnosis training of claim 5, wherein a sixth fault setting button (6) is connected to the second high frequency amplifier module, the sixth fault setting button (6) is arranged on the teaching board for reducing the amplification factor of the second high frequency amplifier module so that the output signal is smaller than the original signal;
the second oscillator module is connected with a seventh fault setting button (7), and the seventh fault setting button (7) is arranged on the teaching board and used for short-circuiting a radio frequency output line and a shielding line of the second oscillator module so as to output no signal;
the second band-pass filter module is connected with an eighth fault setting button (8), and the eighth fault setting button (8) is arranged on the teaching board and used for switching the filtering frequency of the second band-pass filter module so that the second band-pass filter module outputs no signal;
the demodulator module is connected with a ninth fault setting button (9), and the ninth fault setting button (9) is arranged on the teaching board and used for switching the demodulated synchronous carrier frequency, so that the demodulator module outputs no signal.
7. The short wave radio teaching system capable of fault diagnosis training of claim 1, wherein an LC resonant circuit is connected between two stages of circuits with excessive loss in the circuit module for impedance conversion.
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| CN202210608531.3A CN114783238B (en) | 2021-06-07 | 2022-05-31 | Short-wave radio station teaching system capable of performing fault diagnosis training |
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| JP3313434B2 (en) * | 1992-12-24 | 2002-08-12 | 東京瓦斯株式会社 | Failure diagnosis education support device |
| CA2510556C (en) * | 2004-07-01 | 2013-02-19 | Cae Inc. | Method and system for simulation-based troubleshooting and fault verification in operator-controlled complex systems |
| RU50700U1 (en) * | 2005-08-02 | 2006-01-20 | Государственное образовательное учреждение высшего профессионального образования "Самарская государственная академия путей сообщения" (СамГАПС) | STAND FOR STUDYING THE OPERATION OF THE RECEIVER OF TONAL RAIL CHAINS |
| JP2009015146A (en) * | 2007-07-06 | 2009-01-22 | Oki Electric Ind Co Ltd | Failure handling training system |
| JP2010283226A (en) * | 2009-06-05 | 2010-12-16 | Chugoku Electric Power Co Inc:The | Electric power waveform display system for fault detection in on-load tap changer |
| CN103544857A (en) * | 2013-10-30 | 2014-01-29 | 国家电网公司 | Integrated power transformation operation and maintenance training system |
| CN107925240B (en) * | 2015-10-13 | 2020-06-02 | 施瓦哲工程实验有限公司 | Test system for traveling wave fault detector |
| CN108091199A (en) * | 2017-12-25 | 2018-05-29 | 柳州铁道职业技术学院 | Locomotive integration radio communication training platform |
| CN109347504B (en) * | 2018-09-26 | 2020-08-25 | 西安烽火电子科技有限责任公司 | Short wave radio frequency digital processing system |
| CN109712457A (en) * | 2018-12-25 | 2019-05-03 | 南京科技职业学院 | A kind of training platform |
| CN110198194B (en) * | 2019-04-29 | 2021-08-24 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Radio modulation signal generating device |
| CN211124624U (en) * | 2019-05-30 | 2020-07-28 | 中核核电运行管理有限公司 | Uninterrupted power source system board card fault diagnosis and teaching demonstration platform |
| CN110289876B (en) * | 2019-07-25 | 2024-04-19 | 广东圣大电子有限公司 | VHF microwave frequency hopping radio receiver |
| CN211237253U (en) * | 2019-09-02 | 2020-08-11 | 武汉凌特电子技术有限公司 | Radar principle teaching and maintenance training system platform |
| KR102124879B1 (en) * | 2019-11-19 | 2020-06-22 | 한국철도공사 | Trainning system for railway power supply |
| CN212032493U (en) * | 2020-01-19 | 2020-11-27 | 中国人民解放军陆军军事交通学院镇江校区 | Marine short-wave radio station demonstration device |
-
2021
- 2021-06-07 CN CN202110634307.7A patent/CN113313991A/en not_active Withdrawn
-
2022
- 2022-05-31 CN CN202210608531.3A patent/CN114783238B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114783238B (en) | 2024-05-28 |
| CN114783238A (en) | 2022-07-22 |
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