The earth station of satellite TV system with architecture / transmitter converter LNB of multiple channels of broadband using a common oscillator frequency stabilized

摘要

"The earth station of satellite TV system with architecture / transmitter converter LNB of multiple channels of broadband using a common oscillator frequency stabilized.An earth system of satellite television, particularly for a system of television signal via satellite to rupture.It includes an outdoor unit and an indoor unit that are in communication with one another through a single coaxial cable and a single conductive separate optional.The earth system of satellite television operates to measure errors and reverse frequency conversion using DSP techniques.Allowing for the generation and transmission of signals more accurate link above from the earth system of satellite TV.The control data for the system are sent through a connection of low data rate in a power cable, or by a signalling channel of narrow band through a coaxial cable.The system also utilizes a single reference oscillator to drive the various frequency synthesizers and the like.The earth system of satellite TV uses oscillators related to sections upper and lower connection link.The deviation of the carrier frequency in the link below is measured in part of the circuit trace carrier of a television signal demodulator.The frequency deviation carrier link below is used to synthesize various frequency signals for the sections of upper and lower connection link to correct the mistakes of frequ00fcApperance. For the section of the connection above, the frequency deviation carrier connection is reversed in the lower link above.If the link above is at a frequency different, the measured deviation of the main oscillator system can be scheduled for different reasons of synthesizer.