7/23/2023 0 Comments Freespace loss calculatorThe trees, buildings and terrain can all get in the way of the radio signal, unless very tall towers are used. It can now be seen that certain factors were not considered when running that simple online calculator. Discussions with the customer provided approximate tree heights. Included are approximations of trees (green vertical lines) and buildings (grey vertical lines) as seen on an online map website. Professional Software using Terrain Profilesīelow is a profile of the same path, generated from a terrain database using a professional path loss calculation package. (most paths only need a 20 dB fade margin to be reliable) But on this path, the reality is much different, as the following graphics will show. At -54.5 dBm this would theoretically provide a fade margin of 53.5 dB, for presumably a “bullet-proof” path. The calculated receive sensitivity sounds great. Typical numbers are used: Center Operating Frequency: It shows values for a seemingly simple real-world path. Free Space Loss Calculatorįirst, take a look at this typical online calculation page. This article will show first an online calculation of a typical path, and then a calculation using a well known professional software package. Such tools can be useful, but can also be very misleading and possibly dangerous. A person designing a radio system might think that they've found a great resource when they stumble across one of these calculators. It is fairly easy to find online path loss calculators (or versions built into downloadable spreadsheets).
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