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Direct Broadcast Satellite Communications: An MPEG Enabled Service by Donald C. Mead

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Chapter Four. Key Elements of the Radio Frequency Subsystem

4.1 Introduction

Many of the components shown in Figure 3.1 are standard in the satellite communication business and will not be discussed in this book. However, the shaped reflector antenna, modulation (important for establishing the overall DBS performance), Low Noise Block (LNB), and Traveling Wave Tube Amplifier (TWT-A) are key radio frequency (RF) subsystems and will be discussed individually in this chapter.

4.2 The Shaped Reflector Antenna

Appendix A shows that the rain-fades vary widely throughout the United States. This means that if nothing special were done, areas receiving high rainfall would have unacceptable service because of numerous service outages.

One of the early ...

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