1.���� Background �
propagation effects
2.���� Technical and operational considerations
������� 2.1���� Mission frequency support
requirements
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2.1.1���� Telecommand
and maintenance telemetering
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2.1.2���� Mission
telemetry
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2.1.3���� Tracking
������� 2.2���� Equipment factors
3.���� Link performance
������� 3.1���� Calculation of link performance as
a function of frequency
������� 3.2���� Application to near-Earth space
research missions
4.���� Discussion and conclusions