Low-noise down-converter applied to multi-path satellite receiver, and satellite receiving system

Abstract

The invention discloses a low-noise down-converter applied to a multi-path satellite receiver, and a satellite receiving system. The low-noise down-converter is pre-provided with N user frequency bands. Meanwhile, the frequencies of satellite signals, that are 10.7 to 12.75 GHz, are reduced to be 300-2350 MHz, so that the satellite signals are converted into IF signals through the frequency-reducing process. After that, IF signals corresponding to specified television programs in the specified television program information are picked out of the above IF signals of 300-2350 MHz in frequency. Then, the IF signals corresponding to the specified television programs are mixed with controllable intrinsic signals to be converted into secondary frequency-conversion signals, wherein the frequency range of the secondary frequency-conversion signals is within one idle user band frequency range of N user frequency bands. The N user frequency bands are formed through uniformly dividing a total receiving frequency band of the satellite receiver, and the frequencies of the controllable intrinsic signals are calculated based on the center frequencies of specified television programs and the center frequency of the above idle user band frequency. Finally, the secondary frequency-conversion signals are outputted via a coaxial cable interface. According to the technical scheme of the invention, at most N paths of mutually independent television program signals can be outputted at the same time. Meanwhile, the cable laying cost and the user installation cost are saved. Moreover, the installation complexity of a system outdoor part is lowered.

Description

technical field [0001] The invention relates to a low-noise down-converter suitable for use in multi-channel satellite receivers, and a satellite receiving system using the low-noise down-converter. Background technique [0002] In the traditional Ku-band low-noise downconverter circuit design, two local oscillator frequencies of 9.75 / 10.60GHz are generally used, the built-in 0 / 22KHz switching circuit, and the 0 / 22KHz pulse signal output by the satellite TV receiver to select its low , High local oscillator frequency, at the same time use the 13 / 18V voltage of the satellite TV receiver to switch the horizontal or vertical polarized satellite signal, and transmit it to the satellite TV receiver through the coaxial cable to achieve full-band reception of Ku-band programs. However, in the traditional low-noise downconverter design, two local oscillator frequencies of 9.75 / 10.60GHz are used, which leads to complicated circuit design and increased testing time in the production p...

AI Technical Summary

Problems solved by technology

However, in the traditional low-noise down-converter design, two local oscillator frequencies of 9.75 / 10.60GHz are used, which leads to complex circuit design and increases the test time in the production process

And because each output port of the traditional low-noise down-converter needs to be connected to a satellite TV receiver indoors from the outdoors through a single independent coaxial cable, it makes it difficult to install multiple satellite TV receivers in the face. users, multiple independent downlink cables are required, and even multiple low-noise downconverters are required

It increases the complexity of installation and requires high cable laying costs. At the same time, for those commercial users and home users who have already laid cables, it is necessary to reconfigure the lines, which is costly and requires a large amount of engineering.

Therefore, in the traditional low-noise down-converter circuit design scheme, there are many deficiencies whether it is in the factory design production process or in the case of multi-user use.

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