In the last lesson, we spoke about the Frequency usage and we have seen that we can use it to select the frequency which is less noisy. MikroTik offers for us another way to find the less noisy frequency by using:

• Spectral Scan
• Spectral History

Spectral Scan

So the mission with Spectral Scan is to find which frequency is less used so we can choose it. So use Spectral Scan, we have to go to the MikroTik router terminal and write the following:

[admin@MikroTik] >interface/wireless/spectral-scan
number: wlan1

On the number you have to put WLAN1 interface to scan the frequencies on this interface. Once done and you click enter, you will get the following:

Here you can see which frequency has less noise and you can take it to use it for your wireless. Please note that the lower freqencies and the higher frequencies are less used than the middle one, and that’s because stations like mobile phones, Tablet and PC’s do not support those frequencies. The frequencies that are supported by those devices are the ones in the middle and precisly from the frequency 2412 Mhz until 2472 Mhz (based on the regulatory in The Netherlands). You can see that from the router frequency list here:

Spectral History

Similar to Spectral Scan, you can use Spectral History to scan the less noisy frequencies. Wit the Spectral Histroy it will show you this in a colored way. Also, this needs to be done from the terminal as the following:

[admin@MikroTik] >interface/wireless/spectral-scan
number: wlan1

we can see right away the colored representation of our environment on each of the frequencies:

The black color means that there is little noise on the frequency, while the grey color means that it is too noisy. The best you can choose is up to the green color I would recommend.

That’s all what I wanted to show in this lesson, hope you enjoyed it and see you in the upcoming one.