CN214480637U

CN214480637U - Simple short wave transceiving experimental device

Info

Publication number: CN214480637U
Application number: CN202120803678.9U
Authority: CN
Inventors: 韦棁; 黄奕博; 金伟正
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2021-10-22
Anticipated expiration: 2031-04-19

Abstract

The utility model relates to a short wave communication technology, in particular to a simple short wave transceiving experimental device, which comprises an antenna module, a filtering module, an amplifying module, an oscillating module, a key module and a listening module; the output end of the antenna module is connected with the input end of the filtering module, the output end of the filtering module is connected with the amplifying module, the amplifying module is connected with the listening module and the key module, and the output end of the oscillating module is connected with the input end of the amplifying module. The device can be widely used for experiment teaching and amateurs, and can be used for users to transmit short wave signals with different frequency bands and carry out detection analysis on the short wave signals, and the users can utilize the equipment to detect a complex short wave space; the device has strong flexibility and openness, and also has the characteristics of wide frequency, strong universality and small error; the operation is simple, and the carrying is convenient; the circuit structure is simple, and the stability is high; the cost is low, so the price is low, the popularization and the implementation are convenient, and the market value is important.

Description

Simple short wave transceiving experimental device

Technical Field

The utility model belongs to the technical field of the shortwave communication, in particular to simple and easy shortwave receives and dispatches experimental apparatus.

Background

Despite the continuous emergence of new radio communication systems, the ancient and traditional communication mode of short wave is still generally regarded by the world, and not only is the communication mode not eliminated, but also the communication mode is continuously and rapidly developed. As it has advantages not provided by other communication systems.

First, shortwave is the only means of telecommunication that is not constrained by network hubs and active relays, and if a war or disaster occurs, various communication networks are destroyed and the satellite is attacked. In any communication mode, the anti-destruction capability and the autonomous communication capability of the system cannot be compared with short waves. Secondly, in areas such as mountainous areas, gobi and oceans, the ultra-short waves cannot be covered, and the ultra-short waves mainly depend on the short waves. In addition, compared with satellite communication, short-wave communication does not pay telephone charge, and the operation cost is low. Short-wave communication technology is therefore still very important today.

The universal short-wave transceiver requires flexible configuration to meet test requirements, software control to adapt to different communication standards, broadband characteristics, and the receiver should be an open system. The short-wave transceivers in the current market are various in types and powerful in functions, but often have the defects of high price, large size, inconvenience in carrying, complex operation, unfriendly software interface and the like. How to improve the portability and the usability of the equipment under the condition of ensuring the measurable frequency bandwidth, and simultaneously controlling the product cost within the range which is more acceptable to customers is the important emphasis of the development of short-wave transceivers nowadays.

SUMMERY OF THE UTILITY MODEL

To the problem that the background art exists, the utility model provides a simple and easy shortwave receives and dispatches experimental apparatus.

In order to solve the technical problem, the utility model adopts the following technical scheme: a simple short wave transceiving experimental device comprises an antenna module, a filtering module, an amplifying module, an oscillating module, a key module and a listening module; the output end of the antenna module is connected with the input end of the filtering module, the output end of the filtering module is connected with the amplifying module, the amplifying module is connected with the listening module and the key module, and the output end of the oscillating module is connected with the input end of the amplifying module.

In the simple short-wave transceiving experimental device, the oscillation module selects the 9018 triode and forms a capacitance three-point oscillator with surrounding elements.

In the simple short-wave transceiving experimental device, the amplifying module selects the D882 medium power triode as a class-C power amplifier or an equivalent diode.

In the simple short-wave transceiving experimental device, the listening module selects the LM386 power amplifier integrated chip as the audio power amplifier.

Compared with the prior art, (1) the utility model discloses can support to carry out 500 kilometers two-way remote communication experiments, have the characteristic of high frequency range, this device can be widely used for experiment teaching and amateur to use, can supply the user to launch different frequency channel shortwave signals and detect the analysis to it, the user can utilize this equipment to detect complicated shortwave space; when the device provided by the utility model is used, the flexibility and the openness are very strong;

(2) the device has the characteristics of wide frequency, strong universality and small error;

(3) the operation is simple, and the carrying is convenient;

(4) the circuit structure is simple, and the stability is high;

(5) the cost is low, so the price is low, the popularization and the implementation are convenient, and the market value is important.

Drawings

Fig. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

fig. 2 is an overall circuit diagram of an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be further described with reference to the following specific examples, which should not be construed as limiting the invention.

The simple short-wave transceiving experimental device has the characteristics of high frequency resolution, good portability, wide frequency band and simple structure.

The embodiment is realized by the following technical scheme that the simple short wave transceiving system comprises an antenna module, a filtering module, an amplifying module, an oscillating module, a key module and a listening module; the output end of the antenna module is connected with the input end of the filtering module, the output end of the filtering module is connected with the amplifying module, the amplifying module is connected with the listening module and the key module, and the output end of the oscillating module is connected with the input end of the amplifying module.

The operation of the device of the embodiment in the receiving state and the transmitting state is as follows: when the key of the key module is released, the device enters a receiving state, and the triode of the amplifying module is biased in a nonlinear area and is equivalent to two back-to-back diodes. In a receiving state, the output of the antenna module is subjected to low-pass filtering by the filtering module, and the obtained signal passes through the input amplifying module; the oscillation module generates a signal with fixed frequency and enters the amplification module through capacitive coupling; after the amplifying module performs frequency mixing and power amplification on the input signal, the obtained signal enters the listening module through capacitive coupling; and after the listening module amplifies the audio power of the signal, outputting the obtained signal to an earphone for listening.

When the key of the key module is pressed, the device enters a sending state, and the triode of the amplifying module works in an amplifying state as a class-C resonant power amplifier. In a transmitting state, the oscillation module generates a signal with fixed frequency and enters the amplification module through capacitive coupling; after the power amplification sub-module performs power amplification on the signals, the obtained signals are transmitted to the filtering module through capacitive coupling; after the filtering module carries out low-pass filtering on the signals, the obtained signals are transmitted into the antenna module to carry out short-wave emission.

In specific implementation, as shown in fig. 1, a simple short-wave transceiving experimental device includes an antenna module, a filtering module, an amplifying module, an oscillating module, a key module and a listening module; the output end of the antenna module is connected with the input end of the filtering module, the output end of the filtering module is connected with the amplifying module, the amplifying module is connected with the listening module and the key module, and the output end of the oscillating module is connected with the input end of the amplifying module.

And the antenna module provides a short wave receiving and transmitting antenna to realize the receiving and transmitting of signals. Namely, the antenna module is used for receiving short-wave signals in space and transmitting the short-wave signals.

And the filtering module realizes low-pass filtering of signals through a capacitor and an inductor.

And the amplifying module realizes the switching of the working state of the triode by matching a triode and a biasing circuit with a key of the key module, and amplifies a transmitting signal or mixes a receiving signal. I.e. the amplification module is used to process the received signal or amplify the transmitted signal.

And the oscillation module forms a capacitance three-point (colpitts) oscillator with surrounding elements through a triode to generate a signal with fixed frequency.

And the key module changes the working state of the triode of the amplifying module through a key and a bias circuit, and switches the transmitting state and the receiving state.

And the listening module outputs the processed audio signal to the earphone for listening after performing power amplification on the processed audio signal through the audio power amplification chip.

The oscillation module adopts a 9018 triode to form a capacitance three-point (colpitts) oscillator with surrounding elements; the amplifying module selects a power triode in D882 as a class-C power amplifier or an equivalent diode; the listening module selects an LM386 power amplifier integrated chip as an audio power amplifier.

The working flow of the embodiment is as follows:

when the signal is transmitted, the KEY is pressed, the power supply of the integrated power amplifier chip LM386 is disconnected, and the D882 as a class-C power amplifier works in a normal state. When the signal is received, the KEY is released, the integrated power amplifier chip LM386 is powered on, and the D882 is biased in a nonlinear area. The oscillator of the oscillation module sends an oscillation signal with fixed frequency, and the oscillation module parameters which can be set according to needs include center frequency, cut-off frequency, amplitude (including reference level and amplitude unit), peak value, resolution bandwidth and the like.

When receiving signals, the antenna module acquires signals from an external space, the output of the antenna module is subjected to high-low pass/bypass filtering through the filtering module, the signals are input into the amplifying module through capacitive coupling and are mixed with fixed frequency signals generated by the oscillating module, the output of the amplifying module enters the listening module to be subjected to audio power amplification, and the amplified signals are input into the earphone to be listened. When the signal is transmitted, the signal generated by the oscillation module is transmitted to the amplification module through capacitive coupling for frequency amplification, the amplified signal enters the filtering module for low-pass filtering, and the obtained signal is sent to the antenna module for short-wave transmission.

The simple short-wave transceiving experimental device provided by the embodiment has the characteristics of flexibility and openness and a modular structure, and different functions can be expanded by utilizing the device.

The above is merely a preferred embodiment of the present invention, and not intended to limit the scope and the range of the present invention, and those skilled in the art should be able to realize that all the equivalent substitutions and obvious changes made by the present invention description should be included in the scope of the present invention.

Claims

1. A simple short wave transceiving experimental device is characterized in that: the device comprises an antenna module, a filtering module, an amplifying module, an oscillating module, a key module and a listening module; the output end of the antenna module is connected with the input end of the filtering module, the output end of the filtering module is connected with the amplifying module, the amplifying module is connected with the listening module and the key module, and the output end of the oscillating module is connected with the input end of the amplifying module.

2. The simple short-wave transceiver experimental facility of claim 1, wherein: the oscillation module adopts a 9018 triode to form a capacitance three-point oscillator with surrounding elements.

3. The simple short-wave transceiver experimental facility of claim 1, wherein: the amplifying module selects a power triode in the D882 as a class C power amplifier or an equivalent diode.

4. The simple short-wave transceiver experimental facility of claim 1, wherein: the listening module selects an LM386 power amplifier integrated chip as an audio power amplifier.