What device converts the RF input and output of a transceiver to another band?

A transverter is an accessory device that acts as a two-way bridge, converting both the transmitting and receiving signals of a radio transceiver to operate on a completely different frequency band. For instance, connecting a VHF transverter to a standard HF radio allows the operator to communicate on the 2-meter band using the HF radio's interface. The term itself is a combination of 'transmitter' and 'converter'. The distractors, such as high-pass or low-pass filters, only block specific ranges of frequencies to prevent interference and do not actively translate a signal to a new operating band.