The Swan Model HF-700-S Transceiver together with its accessories and optional equipment, is designed to be used in either CW or SSB modes on all portions of the 80, 40 20, 15 and 10 meter amateur radio bands. Many of the MARS frequencies may also be covered by using the Model 510-X oscillator accessory The HF-700-S generates a single sideband signal by means of a crystal lattice filter, and the transceive operation automatically tunes the transceiver to the received frequency. Provisions are included in the transceiver for operation on either upper or lower sideband.