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"All fiction is propaganda, and the fiction we like is the propaganda we believe in, and the fiction we don't like is the propaganda we don't believe in."
- Samuel R. Delany

Ultrawave  
  A means of faster-than-light (FTL) communication.  

This appears to be the first reference to the 'hyperwave' means of communication.

His ultra-wave observer and sometime clerk was Lyman Cleveland himself, probably the greatest living expert in beam transmission.
Technovelgy from Triplanetary, by E.E. 'Doc' Smith.
Published by Not known in 1934
Additional resources -

Another early mention is found in the 1939 Lester del Rey story Habit. In the story, racing rockets head from Mars to a point above the ecliptic, down to Jupiter and back to Mars.

The radio signals came through on the ultrawave every so often, but the pep-talk description of the thrilling contest for endurance racing didn't mean much when I put it up against the facts. A racing ship in space on a long haul is the longiest, most God-forsaken spot under the stars.

Conversations seem to take place faster than they would at light speed; however, this quote makes it obvious that hyperwave is not instantaneous.

Already it took time for the messages to reach Kor [Mars] and return, and I tried to locate Olsen with his two-and-a-half-million-mile lead... Finally the report came back.

Take a look at some of these explicitly FTL communication methods:

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Additional resources:
  More Ideas and Technology from Triplanetary
  More Ideas and Technology by E.E. 'Doc' Smith
  Tech news articles related to Triplanetary
  Tech news articles related to works by E.E. 'Doc' Smith

Ultrawave-related news articles:
  - Lower Limit Of Quantum Communication Speed

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