In the masterpiece, we focus on improving the radio wave situation of Wi-Fi and explain.As you can see, the radio waves of Wi-Fi do not fly as much as expected.At home where Wi-Fi communication situation is not good, we are looking for a little more comfortable.
Wi-Fiルーターの電波の入りを良くするため、今回はWi-Fiのチャンネルがどうなっているのかを見てみようList of articles in "I don't know" of home Wi-Fi!
Although it has been a while since the last time, there are three tips that I have taught so far.Be careful not to be blocked by a wall that blocks radio waves (concrete or gypsum boards, etc.), change the direction of radio waves in the orientation of the antenna, and use radio waves well.
Also, it may be a bit confusing, but it is not the case to fly anything with a strong radio wave.It is best to narrow down the radio wave output so that the radio wave does not reach other than the place where you use it, and it is also important to reduce the output so that it does not become inconvenient, and reduce the security risk without leaking the radio as possible.
From now on, let's take a look at how to use the channel used in Wi-Fi effectively.The frequency used in Wi-Fi is 2.The fact that there are two 4GHz bands and 5GHz band are mentioned a bit in the second edition of the masterpiece.Roughly speaking, in addition to Wi-Fi, radio waves such as microwave ovens are flying around, and they are always crowded 2.Let's imagine the 4GHz band and the 5GHz band that is relatively empty but not flying far away.In other words, the point is how to use the free 5GHz band.
Each of these two frequency bands is divided into the width of the channel, and is used to automatically select something empty from multiple channels according to the situation and use it for communication.
2.The 4GHz band is basically 13 channels [*1], and the 5GHz band has 19 channels, but 2.Even if the 4GHz band is used in the narrowest 20MHz width, it can only be used as almost three channels.For this reason, the 5GHz band can be used overwhelmingly widely.
[*1] …… Currently, the number of substantial channels is 13, but IEEE 802 used to Japan before..There was a Wi-Fi router that could use the 14th channel as a 11B channel.However, there is basically no current model that can use this phantom 14 channel.
Recently, there is a mechanism to use multiple channels to speed up Wi-Fi communication, and IEEE 802.When using the 5GHz band in 11ac, it is used as 80MHz width by bundling four channels.In this case, the number of channels that can be secured will be four.2.IEEE 802 in the 4GHz band.If you use 11n, you can secure two things that can be secured, and if you do poorly, you may be one.
