Black Echo

Smart Search

Search the entire archive like a dossier index.

Titles, archive codes, tags, headings, and related entities are all indexed together so the trail feels fast and intentional.

2 matchesClear all
Credibility: well-supported at the program and mission levelTag: declassified programs
Articlewell-supported at the program and mission level Browse result

JUMPSEAT ELINT Satellite History

JUMPSEAT marked a major turning point in overhead signals intelligence. This entry traces how a highly elliptical orbit platform built under Project EARPOP extended American collection into a new orbital regime and became the progenitor of later HEO listening systems.

Declassified / Nsa/historical heo sigint satellite/2026-03-30
JUMPSEATProject EARPOPNSANROProgram AHEO
Articlewell-supported at the program and mission level Browse result

GRAB: First American ELINT Satellite

GRAB was one of the boldest early Cold War reconnaissance breakthroughs. This entry traces how a covert Naval Research Laboratory satellite hidden behind a solar-radiation experiment became America’s first successful ELINT satellite and helped launch the age of space-based signals intelligence.

Declassified / Nsa/historical elint satellite/2026-03-29
GRABTattletaleCanesSOLRADELINTNSA history