Remote low-power radio frequency-modulated transmitter

Abstract

The invention discloses a remote low-power radio frequency-modulated transmitter comprising first to sixth resistors, first to six capacitors, a first triode, a second triode, a diode, a radio frequency choke coil, an inductor, an antenna, an audio signal input device, and a power supply. A first end of the first resistor is connected with the positive electrode of the power supply, a first end of the second resistor, a first end of the third resistor, and a first end of the radio frequency choke coil. According to the remote low-power radio frequency-modulated transmitter of the invention, the second triode and peripheries thereof constitute a high-frequency oscillator. An audio signal input by the audio signal input device is amplified by the first triode first, the low-frequency signal after amplification modulates high-frequency carrier, and the audio signal is transmitted via the antenna after modulation. The remote low-power radio frequency-modulated transmitter of the invention has the advantages of simple structure, less noise, long transmission distance and stable work, and has popularization and application values.

Description

technical field [0001] The invention relates to a frequency modulation transmitter, in particular to a long-distance low-power radio frequency modulation transmitter. Background technique [0002] With the development of society and the advancement of science and technology, radio technology has become more and more mature. Radio technology is a technology that transmits signals through radio waves. The principle is that changes in the strength of current in conductors will generate radio waves. Using this phenomenon, The information can be loaded on the radio wave through modulation. When the radio wave propagates through space and reaches the receiving end, the electromagnetic field change caused by the radio wave will generate a current in the conductor, and the information can be extracted from the current change through demodulation. For the purpose of information transmission, radio technology is widely used especially in short-distance communication, but the tradition...

AI Technical Summary

Problems solved by technology

[0002] With the development of society and the advancement of science and technology, radio technology has become more and more mature. Radio technology is a technology that transmits signals through radio waves. The principle is that changes in the strength of current in conductors will generate radio waves. Using this phenomenon, The information can be loaded on the radio wave through modulation. When the radio wave propagates through space and reaches the receiving end, the electromagnetic field change caused by the radio wave will generate a current in the conductor, and the information can be extracted from the current change through demodulation. For the purpose of information transmission, radio technology is especially widely used in short-distance communication, but the traditional radio transmitter has a complex structure, more clutter, short transmission distance, and unstable work

Images