The HW-101 is an HF (80 to 10 meter) amateur band SSB transceiver. Transmitter finals are a pair of 6146 tubes. It was used in fixed and mobile service. Like most equipment used in mobile service, it requires an external power supply. The HP-23 (A, B or C) or PS-23 is the typical accompanying AC supply, and the HP-13 is a companion mobile supply.