Beskrivning : This RAE-B (Radio Astronomy Explorer B) mission was the second of a pair of Radio Astronomy Explorer satellites. It was placed into lunar orbit on 15 June 1973, to provide radio astronomical measurements of the planets, the sun, and the galaxy over the frequency range of 25 kHz to 13.1 MHz.
Two tape recorders provided backup storage. A VHF transmitter served primarily for range and range-rate measurements and as a backup. Commands were received on a VHF (148 MHz) receiver, which also was a part of the range and range-rate system.
Kennedy Space Center post stamp and Explorer 49 satellite.

USA 630 - picture enhanced ?

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EXPLORER 49 (RAE B) (LUNAR ORBITER) · DELTA 1913