| Acronym | Meaning |
 | B/W | Black And White |
| PMU | PCM Master Unit |
| PSAC | Presidential Scientific Advisory Committee |
| RTB | Resistance Temperature Bulb |
| OHA | Orbital Height Adjustment Maneuver |
| HFE | High Frequency Executive |
| MAU | Million Accounting Units |
| FDS | Functional Design Specifications |
| RM/MS&C | Control |
| ESTEC | European Space Research And Technology Center |
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