simple vsat cable interface with simple conversion architecture for receiving and transmitting

摘要

The present invention relates to a vsat system modem having three chips and one block. A first chip generates a modulated carrier signal and a local oscillator signal of the same frequency. A second chip receives the local oscillator signal from the first chip and produces a reference signal. The reference signal and the modulated carrier signal are received in the block, which multiplexes the reference signal and the modulated carrier signal in a link between simple installations. the link between simple installations transmits the modulated carrier signal and the reference signal and provides a modulated carrier signal received to a third chip. the first chip may be a synthesizer / modulator chip, the second chip may be a pre-climber chip, the third chip may be a dvb-s2 tuner chip, and the block may be a multiplexer. The chips can be standard semiconductor chips. Alternatively, a digital to analog converter chip can produce the reference signal.