Abstract: A signal repeater assembly (1) for a spacecraft, includes a channel selectivity network (CSN) (2) having a plurality of first input ports (4-13) connected by selectively operable filter circuits (14-23) to a plurality of first output ports (24-31) to enable a signal at any selected first input port (4-13) to be passed to any selected first output port (24-31). The CSN (2) is connected to a shared power amplification module (SPAM) (3) having a plurality of second input ports (44-51) for receiving signals from the first output ports (24-31), a plurality of second output ports (52-59) and a network (60) of balanced amplifier devices (61) operable to couple the second input ports (44-51) to the second output ports (52-59) so that any amplification of a signal received at any one of the second input ports (44-51) is shared by all the amplifier devices (61) to allow the total available amplification power to be used by any one or a combination of second output ports (52-59).

Abstract: Apparatus for transferring RF signals between a plurality of inputs and a plurality of outputs comprises a plurality of output multiplexers 30.sub.1 . . . 30.sub.10, each made up of a plurality of hybrid/tunable filter combinations 21.sub.1 . . . 21.sub.8. The RF signal inputs of the apparatus are supplied to one output multiplexer 30.sub.1 and the inputs of each output multiplexers are connected to the inputs of the adjacent multiplexer, such that a signal not transmitted by one output multiplexer will be passed to a next output multiplexer, and so on. By appropriate tuning of the filters 24 in the output and multiplexers the RF signals may be reconfigurably distributed between the inputs and the outputs, and, the need for switching is avoided while maintaining an acceptably low path loss.