Beyond 40% blockage the signal loss will become significant. Typically, 20% Fresnel Zone blockage introduces little signal loss to the link. The rule of thumb is that 60% of Fresnel Zone must be clear of obstacles. This is because 2.4GHz waves are absorbed by water, like the water found in trees. You want a clear line of sight to maintain strength, especially for 2.4GHz wireless systems. The Fresnel Zone is the area around the visual line-of-sight that radio waves spread out into after they leave the antenna. With the above two Free Space Path Loss equations, we can find out the Distance in km. If d is measured in kilometers, f in MHz, the formula is:įSPL (dB) = 20log10(d)+ 20log10(f) + 32.44įrom the Fade Margin equation, Free Space Path Loss can be computed with the following equation.įree Space Path Loss=Tx Power-Tx Cable Loss+Tx Antenna Gain+Rx Antenna Gain - Rx Cable Loss - Rx Sensitivity - Fade Margin K= constant that depends on the units used for d and f The following formula can reflect the relationship between them. Find out more about our Pods, or as we call it: WiFi Max.FSPL depends on two parameters: First is the frequency of radio signals;Second is the wireless transmission distance.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |