What is a transponder

A satellite contains multiple channels, called transponders, that provide bandwidth and power over designated radio frequencies. The transponder’s bandwidth and power dictate how much information can be transmitted through the transponder and how big the ground equipment must be to receive the signal .

The term “satellite transponder” refers collectively to a transmitter-receiver subsystem on board the satellite that processes, amplifies and retransmits a range of frequencies (the transponder bandwidth) to another location/terminal/antenna on the earth .

A transponder is a wireless communications, monitoring, or control device that picks up and automatically responds to an incoming signal . The term is a contraction of the words transmitter and responder.

Each of this transponder occupy part of the total satellite bandwidth (BW) i.e. 500 MHz . Figure-1 depicts transponder channels with each utilizing 36 MHz of bandwidth from the total BW of 500 MHz. The guard band of 4 MHz is provided between transponders to avoid interference.