Small short-wave preselector

A preselector and short-wave technology, applied in transmission systems, electrical components, impedance networks, etc., can solve the problems of short-wave pre-selectors such as large size, narrow frequency range, lack of flexibility and practicability, etc., to achieve flexibility and practicability , the external circuit is simple, the effect of volume reduction

Active Publication Date: 2012-06-20
广东圣大通信有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the size of the existing shortwave preselector is too large and the frequency range is narrow, which lacks flexibility and practicability in practical

Method used

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  • Small short-wave preselector
  • Small short-wave preselector
  • Small short-wave preselector

Examples

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Embodiment Construction

[0022] Such as figure 1 As shown, the small-sized short-wave preselector of the embodiment of the present invention includes the front stage of the basic resonant circuit, the rear stage of the basic resonant circuit, a low-noise amplifier circuit, a switched diode capacitor array, a triode drive circuit, a single-chip microcomputer main control circuit and a radio frequency signal channel gating switch; the radio frequency signal input terminal is sequentially connected to the first radio frequency signal channel gating switch, the front stage of the basic resonant circuit, the low noise amplifier circuit, the rear stage of the basic resonant circuit, the second radio frequency signal channel gating switch, and the radio frequency signal output end, the The single-chip main control circuit is connected to the front stage of the basic resonant circuit through the first triode drive circuit and the first switched diode capacitor array, and the single-chip main control circuit is...

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Abstract

The invention discloses a small short-wave preselector, which comprises a basic resonant circuit preceding stage, a basic resonant circuit backward stage, a low-noise amplification circuit, a switching diode capacitor array, a triode driving circuit, a singlechip main control circuit and radio frequency signal channel gating switches, wherein an input radio frequency signal passes through a first radio frequency signal channel gating switch and then is transmitted to the basic resonant circuit preceding stage for frequency selection, and a useful signal is output; and the useful signal is amplified by the low-noise amplification circuit and subjected to frequency selection output through the basic resonant circuit backward stage and a second radio frequency signal channel gating switch. According to the small short-wave preselector provided by the invention, in a filtering system module of a receiver, a useless signal near a required frequency can be suppressed, and the sensitivity of the receiver is improved.

Description

technical field [0001] The present invention relates to a small shortwave preselector. Background technique [0002] The carrier frequency of the traditional fixed-frequency communication system is fixed, and the anti-jamming performance is poor. In electronic tactical countermeasures, it is easy for the enemy to intercept the content of the transmitted information, or discover the location of the communication machine and its system to expose the target. In order to improve radio communication performance, improve its anti-interference ability, and improve anti-interception, anti-interception ability, anti-interception signal fast tracking, etc., it has become an important goal of military communication technology innovation and development. The short-wave preselector is the receiving part used in the transmission and reception of the communication system. It is mainly used to connect the front end of the receiver to the antenna to improve the sensitivity and anti-interfere...

Claims

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Application Information

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IPC IPC(8): H03H9/46H04B1/16
Inventor 麦绍伟于孝云
Owner 广东圣大通信有限公司
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