![]() 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. At one site we've started using shielding on the walls to cut down our signals from crossing into other offices nearby.FSPL depends on two parameters: First is the frequency of radio signals;Second is the wireless transmission distance. Lucky I've managed to either over-ride them or got them to alter there AP to a different band. My biggest issue is when someone or our neighbors setup an AP that sits within our bands. But it does take a bit of effort in not only the design of the network but making sure everyones systems are properly configured. I would recommend you download this app: WiFi Exporer which is a great app to see whats happening with your WiFi networks.įYI I have over 100 Apple systems using our local meshed WiFi network without any performance issues. But the 5 GHz bands offer much better throughput! This is needed more so with the 5.0 GHz WiFi bands as the distance and ability to pass the signal through walls is not as good as the older 2.4 GHz bands. Many people with large homes setup a Mesh network which is when you have multiple AP's located at different parts of your property. How about checking your signal strength and see if the location of your WiFi AP is located at the best placement within your home. So it will be still awhile before we get then needed data flows to really benefit with these faster local connections to the internet. Even still the resource at the other end may still throttle you. This is where the newer multiple flow feature that many Router companies just intro'd in Los Vegas CES show MU-MIMO this last week will give you the real bang in performance if you have a local server or very good access to the internet with multiple systems fighting for access over your WiFi network.įYI: Most of the US has very poor data rates though there ISP. Even still MIMO services are limited to a single system at a given time. You should now see the same performance numbers! From the same location in your house.Īlso don't forget the 802.11ac based Air systems don't have MIMO (two matched antenna's) So you won't get the full ability unlike the newer MacBook Pro's can which have MIMO with 802.11ac. Now alter your settings in the Air so it to is accessing the same 2.4 GHz band. Your older MacBook is accessing the 2.4 GHz band with its older radio. What I do is setup the different bands of my WiFi router with slightly different names (I add 2 & 5 at the end of the name per the frequency). 5 GHz is great for data throughput but it can't reach as far or get though walls that effectively. I think you got your self caught in the 5 GHz problem 802.11ac range issues: Overcoming wireless signal shortcomings.ĭifferent frequencies have better distance and can get though walls better.
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