Dual output tuner for receiving satellite TV signals

Abstract

The invention relates to a dual output tuner for receiving satellite television signals. The dual output tuner for receiving the satellite television signals comprises two high frequency adapters which are installed in the same circuit box, adapter seats of the high frequency adapters, the circuit box, a guided wave cylinder and a wave collector. A single circuit board comprises a high frequency amplification control unit, a high frequency amplification unit with two channels of horizontal signals and two channels of perpendicular signals, second distribution units, a signal amplification unit, a signal coupling unit, a BPF band-pass filtering unit, an integrated signal processing unit, a power and control unit and a quartz crystal oscillating unit. The dual output tuner for receiving the satellite television signals has the advantages that local oscillation, frequency mixing and medium frequency amplification are all integrated inside a signal processing and control chip, a local oscillator resonance cavity required by a prior medium DR is eliminated from the circuit box, crystal oscillation is slightly influenced by temperature in a common environment, so that high stability is maintained, the quality of output signals is guaranteed, and manufacturing difficulty is further reduced. The size of the circuit box is reduced, so that body weight is reduced, power consumption and used materials are reduced, a production procedure is simplified, and production efficiency is improved.

Description

technical field [0001] The invention relates to a low-noise amplifying frequency converter for high-frequency signals, in particular to a double-output high-frequency head for receiving satellite TV signals. Background technique [0002] refer to figure 1 At present, a conventional dual-output tuner usually includes a main body 33, a low-frequency circuit board, a 9.75GHz low-frequency shield 35, a 10.6GHz high-frequency shield 34, a 9.75GHz low-frequency galvanized iron cover plate 37, and a 10.6GHz high-frequency galvanized iron cover Board 36, waveguide 38, wave collector 39, 2 PCB boards and two local oscillator debugging screws (located on two shielding covers respectively). [0003] The dual-output KU-band tuner uses two circuit boards for low frequency and high frequency, and the SMT processing is complicated. refer to figure 2 and image 3 The circuit block diagram and schematic diagram of the circuit board, the circuit composition of each circuit board is also ...

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Problems solved by technology

Therefore, the volume and consumables of the main body are relatively large

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