Q.Draw the diagram of a satellite transponder system.

A transponder is the receive-and-transmit unit inside a communication satellite, and its block diagram shows how the received signal is amplified and shifted in frequency before being sent back. …

[!TLDR]

The transponder diagram: receiving antenna → LNA (6 GHz) → mixer (fed by a 2 GHz local oscillator) → power amplifier (4 GHz) → transmitting antenna.

A transponder is the transmitter-receiver combination in a satellite that amplifies the received signal and translates its frequency. Its block diagram is a straight signal chain from left to right. The Receiving antenna picks up the 6 GHz uplink signal and passes it to a Low Noise Amplifier, which boosts the weak signal with minimum added noise. The amplified signal goes to a Mixer, which is also fed by a Local Oscillator (LO) at 2 GHz; the mixer subtracts this to translate the 6 GHz signal down to 4 GHz. This 4 GHz signal is raised to high power by a …