In addition to these two functions, Regenerative transponder also performs the demodulation of RF carrier to baseband, regeneration of signals and modulation. i.e., frequency translation and amplification. Regenerative transponder performs the functions of Bent pipe transponder. It is suitable for both analog and digital signals. It converts the frequency of input signal to RF frequency and then amplifies it.īent pipe transponder is also called as repeater and conventional transponder. Bent Pipe Transpondersīent pipe transponder receives microwave frequency signal. Those are Bent pipe transponders and Regenerative transponders. Power Amplifier amplifies the power of frequency down converted signal (down link) to the required level.īasically, there are two types of transponders. This block determines the type of transponder. Low Noise Amplifier (LNA) amplifies the weak received signal.Ĭarrier Processor performs the frequency down conversion of received signal (uplink). It receives uplink signal from the satellite antenna and transmits downlink signal to the satellite antenna. The function of each block is mentioned below.ĭuplexer is a two-way microwave gate. We can easily understand the operation of Transponder from the block diagram itself. The block diagram of transponder is shown in below figure. In general, different frequency values are chosen for both uplink and down link in order to avoid the interference between the transmitted and received signals. Those are amplifying the received input signal and translates the frequency of it. Transponder performs mainly two functions. Hence, the word ‘Transponder’ is obtained by the combining few letters of two words, Transmitter (Trans) and Responder (ponder). Transponder performs the functions of both transmitter and receiver (Responder) in a satellite.

It is one of the most important subsystem of space segment subsystems. The subsystem, which provides the connecting link between transmitting and receiving antennas of a satellite is known as Transponder.

Directv satellite transponder list