Satellite decoder set top tuner having first stage amplifier/attenuator integrated output monitored and set level compared/adjusted and then reception channel set.

摘要

The tuner has a null intermediate frequency and has an analogue block with a first stage attenuator and amplifier with a controlled gain. There is an initialisation stage (20) during which the integrated medium power of the signal received by the tuner in the digital block is compared with a predetermined value and the first stage attenuator and amplifier to reduce the power level to the predetermined value, and then a reception channel is chosen (24).