Page "Deep Space 1" Paragraph 13

The Small Deep Space Transponder ( SDST ) is a compact and light weight radio communications system.

Aside from using miniaturized components, the SDST is capable of communicating over the K < sub > a </ sub > band.

Because this band is higher in frequency than bands currently in use by deep-space missions, the same amount of data can be sent by smaller equipment in space and on the ground.

Conversely, existing DSN antennas can split time among more missions.

At the time of launch, the DSN had a small number of K < sub > a </ sub > receivers installed on an experimental basis ; K < sub > a </ sub > operations and missions are increasing.