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Double moduration type radio transmitter

A dual-modulation, radio technology, applied to electrical components, transmission systems, etc., can solve problems such as poor sound quality and poor anti-interference, and achieve the effects of good sound quality, strong anti-interference ability, and high sensitivity

Inactive Publication Date: 2005-05-04
郭建军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new modulation method, that is, a dual-modulation radio transmitter, for the problems of poor anti-interference and poor sound quality in the above medium-band and short-band radio communication broadcasting receiving equipment.

Method used

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  • Double moduration type radio transmitter
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  • Double moduration type radio transmitter

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Embodiment Construction

[0014] See attached Figure 1~3 , a dual-modulation radio transmitter, which includes a high-frequency signal oscillator, a high-frequency amplifying circuit, an audio amplifying circuit, and is also provided with an amplitude keying modulator and an audio duty ratio modulator; the so-called audio duty ratio modulator The working frequency is 30~100KHZ, the preferred working frequency is 32KHZ~80KHZ; the best working frequency is 35~36KHZ, the audio signal output by the said audio amplifier circuit is connected to the audio frequency accounted for by the amplifier transistor VT5 emitter and collector respectively. Duty ratio modulator input terminals 1 and 2, the pulse square wave output by the audio duty ratio modulator is connected to the input terminal of the amplitude keying modulator, and the high frequency oscillation signal output by the high frequency signal oscillator is connected to the input of the amplitude keying modulator At the P3 terminal, the high-frequency si...

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Abstract

The invention discloses a dual-modulation radio transmitter, which mainly solves the problems of poor anti-interference and poor fidelity of radio communication broadcast receiving equipment in the middle and short bands. The transmitter includes a high-frequency signal oscillator, a high-frequency amplifier circuit, and an audio amplifier circuit. In addition, an amplitude keying modulator is provided between the high-frequency signal oscillator and the high-frequency amplifier circuit. There is an audio duty ratio modulator between the modulators; the high-frequency oscillation signal and the pulse square wave signal are output as a high-frequency discontinuous wave through the amplitude keying modulator; after the signal is amplified by high frequency, it is transmitted and received by the antenna Machine or radio can receive processing.

Description

1. Technical field [0001] The invention relates to radio communication broadcasting, and is especially suitable for a communication receiver of medium and short bands or a dual-modulation radio transmitter of a radio. 2. Background technology [0002] Medium wave (MW) is a broadcasting band widely used in countries and regions all over the world. Mainly used for domestic, provincial, regional and other medium-distance broadcasting. [0003] Shortwave (SW) uses the ionosphere on the outer surface of the earth to reflect and propagate signals multiple times, and the broadcasting covers a long distance. Adopted by countries all over the world as the international broadcasting band, it is also widely used in military, civilian and amateur radio broadcasting communications. [0004] In addition, there is also a high-fidelity broadcast system that uses ultra-short wave frequency modulation (FM) for short distances, and spreads in a straight line, usually covering a range of tens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/02
Inventor 郭建军
Owner 郭建军