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Message: <blockquote data-quote="hairybadger" data-source="post: 870235" data-attributes="member: 389459"><p>I've been idly wondering how transponders are physically implemented on the satellite. Extensive googling has left me none-the-wiser. I imagine the answer varies according to generation and model, but:</p><ul> <li data-xf-list-type="ul">is each transponder a dedicated set of electronics that receives and transmits on a given frequency and polarity throughout the lifetime of the satellite? </li> <li data-xf-list-type="ul">is each transponder a logical set of transistors etc that can be allocated and deallocated as the need arises, so for example a given transponder can transmit at one frequency and then changed to another at the flick of a switch?</li> <li data-xf-list-type="ul">or something else entirely?</li> </ul></blockquote><p></p>