Power Flux Density — Lesson 7

This lesson covers the concept of bent pipe transponder. It explains the concepts of noise power density, and total C/N0. The lesson further delves into the nonlinearity of satellites, explaining how the output power gets saturated with an increase in input power. It introduces the concepts of saturation power flux density and saturated EIRP, and how they are used to determine the operating point of a satellite. The lesson also provides practical examples to illustrate the calculation of uplink and downlink C/N0 and total C/n0.

Video Highlights

00:18 - Introduction and recap of previous lesson
04:39 - Nonlinearity of satellites and saturation of output power
07:58 - Discussion on the concept of input back off and output back off
11:05 - Calculation of EIRP in terms of power flux density and path loss
15:29 - Calculation of C/N0 naught in terms of saturated EIRP and saturated power flux density
22:26 - Example problems

Key Takeaways

- The Carrier-to-Noise ratio (C/N) in the uplink and downlink can be combined to get the total C/N.
- Satellites have non-linear characteristics, and increasing the uplink power does not linearly increase the output power.
- The concepts of saturation power flux density, input back off, and output back off are crucial in calculating the operating point of a satellite.
- The operating point of a satellite is determined by the linear region of the satellite's characteristics.