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"The idea I want to push next is that the United States should make Siberia a Protectorate. Pay the Russians off a hundred, two hundred billion dollars and simply run Siberia in an ecologically responsible way."
- Gregory Benford

Identification Beacon  
  Radio pulse to identify orbiting craft.  

They gave him an orbit; he matched in and steadied down, then set the Chili's identification beacon to his own combination, made sure that the radar of the ship's gig could trip it, and took the gig down to the auxiliary small-craft field at Goddard.
From Methuselah's Children, by Robert Heinlein.
Published by Astounding Science-Fiction in 1941
Additional resources -

Compare to the hyperspace beacon from The Repairman (1959) by Harry Harrison. Also, distinguish from the space-beacon (in the sense of a landing signal) from Exploration Team, a 1956 story by Murray Leinster.

Also, see the seetee blinker from Collision Orbit (1941) by Jack Williamson.

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Additional resources:
  More Ideas and Technology from Methuselah's Children
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Methuselah's Children
  Tech news articles related to works by Robert Heinlein

Identification Beacon-related news articles:
  - ELROI Satellite 'License Plate'

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