A frequency band is how wireless data is transmitted between devices. These bands are radio waves that carry the data and these bands are either 2.4GHz or 5GHz.
Quad Cortex includes an IEEE 802.11 b/g/n Wi-Fi module which operates at 2.4GHz, the most common frequency band.
Which band does my router use?
All Wi-Fi routers have a 2.4GHz band. The advantage of a 2.4GHz is that it has a farther range and it can penetrate solid objects better.
What is the "dBm" value below the selected band?
It is the connection strength between Quad Cortex and the current Wi-Fi band. Quad Cortex needs at least -60dBm or higher to work properly.
Solving connection issues
- Distance to the Wi-Fi router
Reducing the distance between the Quad Cortex and the Wi-Fi router is the most efficient way to improve the strength of the signal.
Without taking any external factors or major obstacles into consideration, a lot of standard Wi-Fi routers operating on the 2.4GHz frequency can reach up to 100 feet (30m) indoors and 150 feet (46m) outdoors.
In comparison, those using the 5GHz frequency usually reach around one-third of these distances.
- Hotspot Compatibility
If you are using a smartphone as a Wi-Fi hotspot, make sure it's operating at 2.4GHz.
For example, the "Personal Hotspot" feature works over 5GHz Wi-Fi by default on all iPhone 12 models. In the Settings > Personal Hotspot menu there is a new "Maximize Compatibility" switch that reverts Personal Hotspot to 2.4GHz band when it's enabled.