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Medium-wave harmonic filter

A harmonic filter and low-pass filter technology, which is applied in the field of navigation and communication, can solve problems such as poor harmonic suppression performance and difficulty in switching working frequency bands, etc., and achieve reliable performance, stable operation, and improved suppression performance.

Active Publication Date: 2010-12-15
TIANJIN 764 COMM AIRMANSHIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the medium-wave harmonic filters manufactured by the existing technology still have the defect of poor harmonic suppression performance, which causes the instantaneous harmonics generated when the transmitter is turned on to affect (interference) other radio equipment around. The harmonic suppression of the medium wave transmitter is -50dB, and the international civil aviation convention requires the harmonic suppression of the medium wave transmitter to be -60dB, and the existing medium wave transmitter still has the defect of switching the working frequency band, that is, the difficulty of frequency band switching

Method used

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Embodiment Construction

[0010] In order to understand the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0011] Such as Figure 1 to Figure 3 As shown, the medium-wave harmonic filter uses a 7-order low-pass filter as the basic circuit, which is divided into 5 sections for filtering according to frequency requirements; the first section is 150kHz~189kHz, the second section is 190kHz~278kHz, and the third section It is 279kHz~378kHz, the fourth segment is 379kHz~515kHz, and the fifth segment is 516kHz~700kHz.

[0012] In this way, the harmonics of the carrier signal output by the power amplifier unit are filtered out, and the sinusoidal signal is filtered and output to the antenna tuner. Each filter unit of the medium wave harmonic filter is composed of four capacitors C1, C2, C3, C4, three inductors L1, L2, L3 and four relays K1, K2, K3, K4. The capacitors and inductors form a 7th order low The filter circu...

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Abstract

The invention relates to a medium-wave harmonic filter used for a medium-wave navigation transmitter. The medium-wave harmonic filter consists of five sections of filtering units, wherein each section of filtering unit forms a filtering channel; each section of filtering unit is a seven-order low-pass filter which is formed by connecting four capacitors, three inductors and four relays; the capacitors and the inductors form a filter circuit part of the seven-order low-pass filter; and a relay coil end in each section of filtering unit is connected with a three-eight decoder in an external control unit. Because the relays are controlled by a level signal output by the three-eight decoder of the external control unit in each section of filtering unit, the switching between the filtering units of the control filter is controlled; the harmonic suppression performance of the medium-wave transmitter is improved, so that the second harmonic suppression performance and the third harmonic suppression performance are improved; the switching of intelligent control mode control frequency bands is realized in the medium-wave transmitter; and thus the medium-wave harmonic filter can be applied to 100W, 200W and 500W series medium-wave transmitters and has the advantages of stable work, reliable performance and popularization value.

Description

Technical field [0001] The present invention relates to the technical field of navigation communication, in particular to a medium wave harmonic filter used in a medium wave navigation transmitter. Background technique [0002] The medium wave harmonic filter is an important circuit unit of the medium wave navigation transmitter, and is currently widely used in various medium wave transmitters that adopt the principle of pulse width amplification for power amplification. However, most of the medium wave harmonic filters manufactured by the existing technology still have the defect of poor harmonic suppression performance, which causes the instantaneous harmonics generated when the transmitter is turned on to affect (interfere) other surrounding radio equipment. The current domestic use The harmonic suppression of the medium wave transmitter is -50dB. The International Civil Aviation Convention requires the harmonic suppression of the medium wave transmitter to be -60dB, and the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/09
Inventor 张强
Owner TIANJIN 764 COMM AIRMANSHIP
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