Beschreibung : Cape Canaveral post stamp and Agena rocket spy launch, spying on Russia, red China and North Vietnam.
The satellites were primary built to intercept soviet communications transmissions, especially line-of-sight microwave links, but were also able to tap into very high frequency (VHF) communications. Main contractor was Lockheed. Reportedly they consisted of a large (ca. 10 m diameter) antenna and were three axis stabilized. They were deployed into a 24 h orbit, which is not geostationary, so that triangulations of emmiter sources can be made from different points.

USA 495 - image retouchée ?

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