top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What is the use of modulator and demodulator in transponder?

+1 vote
543 views

In types of microwave repeaters "regenerative transponder" is one type. In that we use modulator and demodulator.

posted Dec 10, 2015 by Yugandhar Reddy

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

I hope I understood the query -

Most communication satellites are radio relay stations in orbit, and carry dozens of transponders, each with a bandwidth of tens of megahertz. Most transponders operate on a bent pipe principle, sending back to earth of what goes into the conduit with only amplification and a shift from uplink to downlink frequency. However, some modern satellites use on-board processing, where the signal is demodulated, decoded, re-encoded and modulated aboard the satellite these type of transponder are regenerative transponder.

Here Modulator is required to transforms a digital stream into a radio signal on Intermediate frequency (IF) and Demodulator for the Intermediate frequency to the original one.

answer Dec 10, 2015 by Salil Agrawal
...