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Transponder vs Repeater-Difference between Transponder and Repeater

This page compares Transponder vs Repeater and mentions difference between Transponder and Repeater.

Satellite Transponder

Transponder

Following are the basic functions of a transponder.
• It does frequency translation i.e. converts frequency from one band to the other band. As shown in the figure-1 C-band transponder converts frequency in 6 GHz band to frequency in 4 GHz band range.
• It does amplification of the input signal to provide amplified output to withstand against path loss and other losses incurred due to system elements.

Repeater

Repeater

Following are the basic functions of a repeater.
• It does only power amplification of the input signal and retransmits the amplified signal.
• It does not perform any frequency translation and hence RF components such as RF mixers are not needed.
• Figure-2 depicts typical repeater used in the LTE system.



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