It accepts a range of frequencies on the input and retransmits the entire range on the output. All offsets within that range are preserved. If someone transmits a very powerful signal into the satellite, it will spend most of its power retransmitting that signal and all of the other signals will drop in power. This closely resembles a land-based repeater. It listens for signals on one frequency and retransmits it on another frequency.
Some satellites are easier to work than others.
The satellites that follow can be operated fairly easily and are referred to by some as the Easy Sats. What follows is a brief description of each satellite. A summary list of operating frequencies is included later. It's been in orbit since 1986. Mir has 2-meter equipment on board and they operate packet and voice on 145.200 MHz.