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NSSDCA ID: 1989-033B

Telecommunications Description

The DSN supported two unique capabilities for Magellan: (1) the ability to simultaneously receive and process two coded downlink channels (one high-rate X-band and one low-rate S- or X-band); and, (2) the ability to transmit uplink command data in X-band at rates of 7.8 and 62.5 bps and to switch in near-real time between the two data rates. The real-time coverage of the separation of Magellan from the inertial upper stage was supplemented with non-DSN stations at Guam and MILA. Initial acquisition of Magellan used the 26 m antennae of the DSN. Telemetry support for Magellan primarily utilized (simultaneously) the two 34 m antennae at each DSN site (Goldstone, Madrid, and Canberra). During the periods just prior to and after superior conjunction, however, telemetry was provided by the 70 m antenna at each site. During superior conjunction, no telemetry support was provided due to pointing restrictions on the antennae (i.e., they could not point at the sun).

Telemetry Path

Telemetry support via Deep Space Network (DSN)

Effective Telemetry

146.22 kbps

Telemetry Rates

115.2-268.8 kbps

Additional Information

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