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A circuit for automatic attenuation control of the RF input terminal of the front stage of the medium and short wave receiver

An automatic attenuation control and attenuation circuit technology, applied in the field of communication, can solve problems such as signal distortion and limited dynamic adjustment range, and achieve the effect of increasing the attenuation range

Active Publication Date: 2021-07-30
云南康木信科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the receiving antenna of the medium and short wave receiver faces the direction of the transmitter of the received broadcast signal, the received broadcast signal is very strong, which will cause the demodulated signal of the receiver to be distorted
Although there is automatic gain control in the medium and short wave receiver, the dynamic adjustment range is limited

Method used

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  • A circuit for automatic attenuation control of the RF input terminal of the front stage of the medium and short wave receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: as figure 1 As shown, a circuit for automatic attenuation control of the front stage radio frequency input terminal of a medium and short wave receiver is characterized in that it includes an antenna input interface AT-IN, a control signal input interface Control, a 5V DC power supply interface VCC-5V and GND, Attenuation signal output interface OUT, two different attenuation circuit modules; the two different attenuation circuit modules are specifically an attenuation circuit with a fixed attenuation multiple controlled by a relay and an attenuation with a different attenuation multiple controlled by a triode switch voltage divider circuit circuit.

[0020] Preferably, the two different attenuation circuit modules are controlled by the same external control terminal signal.

[0021] Preferably, the attenuation circuit with a fixed attenuation multiple controlled by the relay includes a straight-through path and an attenuation path, which can be automatic...

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PUM

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Abstract

The invention relates to a circuit used for automatic attenuation control of a front-stage radio frequency input end of a medium and short wave receiver, belonging to the technical field of communication. The present invention includes an antenna input interface AT-IN, a control signal input interface Control, a 5V DC power supply interface VCC-5V and GND, an attenuation signal output interface OUT, and two different attenuation circuit modules; the two different attenuation circuit modules Specifically, the attenuation circuit with a fixed attenuation multiple controlled by a relay and the attenuation circuit with different attenuation multiples controlled by a triode switch voltage divider circuit. The invention can be directly applied to the front stage of the radio frequency antenna input of the medium and short wave receiver, combined with the control signal given by the external single-chip microcomputer, it automatically attenuates according to the strength of the actually received broadcast signal, laying a foundation for subsequent processing of the received signal.

Description

technical field [0001] The invention relates to a circuit used for automatic attenuation control of a front-stage radio frequency input end of a medium and short wave receiver, belonging to the technical field of communication. Background technique [0002] In the broadcast transmitting station, when the medium and short wave receiver monitors the actual broadcast signal, it needs to monitor the broadcast signal at different frequencies in different time periods, and different broadcast signals face different directions due to the different transmitters of the broadcast transmitting station, so the medium and short wave receiver The signal strength is different when receiving broadcast signals of different frequencies. If the receiving antenna of the medium and short-wave receiver faces the direction of the transmitter of the received broadcast signal, the received broadcast signal is very strong, which will cause the demodulated signal to be distorted by the receiver. Alth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H03G3/30
CPCH03G3/3042H04B1/16
Inventor 龙华邵玉斌杜庆治唐传林
Owner 云南康木信科技有限责任公司
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