ultra-sender

Updated: January 24, 2026

Both men leaped for the receiver which had so unexpectedly burst into sound, reaching it just as it relapsed into silence, and from the tape of the recorder they read the brief message. "...h four seven ganymede point oh four seve...." "That's Steve!" yelled Brandon. "Nobody else could build an ultra-sender! Direction?" "No need of calculating distance or direction.

E. E. (Edward Elmer) Smith - Spacehounds of IPC