What is the advantages of using intermadiate frequency for satellite system?

Answer 1

There are three advantages to this type of frequency:

1) At very high frequencies (gigahertz), signal processing circuitry performs poorly. So a high frequency signal is converted to a lower intermediate frequency for processing.

2) In receivers that can be tuned to different stations, intermediate frequencies are used to convert the various different frequencies of the stations to a common frequency for processing. Without using intermediate frequencies, all the complicated filters and detectors in a radio or television would have to be tuned in unison each time the station was changed.

3) The primary advantage is that it improves frequency selectivity. In communication circuits, a very common task is to separate out or extract signals or components of a signal that are close together in frequency. This is called filtering. So a narrower bandwidth and more selectivity can be achieved by converting the signal to a lower intermediate frequency and performing the filtering at that frequency.

Hope this helps!