TABLE OF CONTENTS The link budget provides a means to design a transceiver and perform the necessary analysis to ensure that the design is optimal for the given set of requirements. The link budget provides a way to make system tradeoffs easy and ensure that the transceiver operates properly over the required range. Once known or specified parameters are entered, the link budget solves for the unknown parameters. If there is more than one unknown parameter, then the tradeoffs need to be considered. The link budget is continually re-worked, including the tradeoffs to obtain the best system design for the link. Generally a spreadsheet is used for ease of changing the values of the parameters and seeing the effects of the change (see in Table 1-1).
| Link Budget Analysis | ||||
|---|---|---|---|---|
| Slant Rng (km) | Freq. (GHz) | Power (W) | ||
| Enter Constants | 92.65 | 3 | 1 | |
| Enter Inputs | Inputs | Power Levels | ||
| Transmitter | Gain/Loss (dB) | Sig.(dBm) | Noise(dBm) | |
| Tran.Pw***r(dBm)= | 30 | |||
| Trans. line loss = | ?1 | 29 | ||
| Other(switches) | ?2 | 27 | ||
| Trans Ant Gain = | 10 | 37 | ||
| Ant. Losses=* | ?2 | 35 | ||
| ERP | 35 | |||
| Channel | ||||
| Free Space Loss = | ?141.32 | ?106.32 | ||
| Rain Loss = | ?2 | ?108.32 | ||
| Cloud Loss = | ?1 | ?109.32 | ||
| Atm loss(etc) = | ?0.5 | ?109.82 | ||
| Multipath Loss= | ?2 | ?111.82 |
