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signal frequency converter

A transmitter and signal technology, applied in the field of frequency conversion circuits, can solve problems such as insufficient information collection distance in satellite mobile communication systems

Active Publication Date: 2011-12-28
李冠军
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a signal frequency conversion transmitter, which can receive the image and voice wireless signals continuously transmitted by the transmitter of the wireless image transmission system at a frequency of 345±10MHz, and transmit them to the up-converter, thereby solving the problem of existing satellite mobile Insufficient information collection distance of communication system

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Embodiment Construction

[0027] Referring to the accompanying drawings, a signal frequency conversion transmitter includes: a first filter BPF1, a second filter BPF2, a third filter BPF3, a fourth filter BPF4, a fifth filter BPF5, a sixth filter BPF6, The first amplifier A1, the second amplifier A2, the third amplifier A3, the fourth amplifier A6, the first variable gain amplifier A4, the second variable gain amplifier A5, the first mixer MIXER1, the second mixer MIXER2, The third mixer MIXER3, the low-pass filter LPF1, the first local oscillator frequency source LO1, the second local oscillator frequency source LO2, the third local oscillator frequency source LO3, and the attenuator ATT1;

[0028] The bandwidth of the first filter BPF1 is 20MHz, it inputs a signal with a power of -110dBm~-31dBm and a frequency of 345MHz, and outputs a signal with a power of -111~-31dBm and a frequency of 345MHz;

[0029] The first amplifier A1 amplifies the output of the first filter BPF1 to output a signal with a po...

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Abstract

The invention belongs to an electronic circuit and particularly relates to a frequency conversion circuit used in a Ku frequency range satellite communication system. A signal frequency conversion transmitter comprises a first filter (BPF1), a second filter (BPF2), a third filter (BPF3), a fourth filter (BPF4), a fifth filter (BPF5), a sixth filter (BPF6), a first amplifier (A1), a second amplifier (A2), a third amplifier (A3), a fourth amplifier (A6), a first variable gain amplifier (A4), a second variable gain amplifier (A5), a first mixer (MIXER1), a second mixer (MIXER2), a third mixer (MIXER3), a low-pass filter (LPF1), a first local oscillator frequency source (LO1), a second local oscillator frequency source (LO2), a third local oscillator frequency source (LO3) and an attenuator (ATT1). The signal frequency conversion transmitter converts the frequency of a sending set signal of a wireless image transmission system, and then, transmits the signal to a satellite via an originalup-converter, thereby solving the problem that a distant station cannot remotely acquire information in the existing satellite mobile communication.

Description

technical field [0001] The invention belongs to an electronic circuit, in particular to a frequency conversion circuit used in a Ku frequency band satellite communication system. Background technique [0002] At present, in the known Ku-band satellite communication system, the main function of the up-converter is to convert the intermediate frequency signal of 950-1450 MHz into a Ku-band carrier signal of 14.0-14.5 GHz, and then output it to a high-power amplifier and send it to the satellite. In actual use, this 950-1450MHz intermediate frequency signal can only be input to the up-converter through a specific model and wired connection. Therefore, video and voice collection can only be carried out around the satellite communication equipment, and it is difficult to reach the more distant scene. Contents of the invention [0003] The purpose of the present invention is to provide a signal frequency conversion transmitter, which can receive the image and voice wireless sig...

Claims

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Application Information

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IPC IPC(8): H03D7/16H04B7/185
Inventor 杨胜领李冠军付稣
Owner 李冠军
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