noise level in the radio

is it possible for RTL8720DN to measure the noise level in the radio?

not the signal strength of the packet!

thanks

@Aleksandr_Shilov

The function you are describing seems to be direct RF measurement. To my knowledge this function is not exposed, a software defined radio might be more suitable for your needs.

So sorry

Other transceivers are able to show the noise level, for example TKA52, sx1280

How can we choose the best channel if we can’t evaluate it in any way?

@Aleksandr_Shilov

I misunderstood you, I thought you were not interested in using WiFi at all.

It is possible to do a scan on a single WiFi channel, get the number of APs broadcasting, and use that as an estimate of channel congestion.

So we will see interference only from WiFi, and you need to see all the interference

Some APN WiFi (Qualcomm Atheros) are able to detect the noise level

can you provide some examples of these noise level outputs?

root@TP-Link ~ # iw dev wlan0 survey dump | egrep ‘(frequency|noise)’

frequency: 2412 MHz [in use]
noise: -92 dBm
frequency: 2417 MHz
noise: -93 dBm
frequency: 2422 MHz
noise: -94 dBm
frequency: 2427 MHz
noise: -93 dBm
frequency: 2432 MHz
noise: -93 dBm
frequency: 2437 MHz
noise: -93 dBm
frequency: 2442 MHz
noise: -62 dBm
frequency: 2447 MHz
noise: -68 dBm
frequency: 2452 MHz
noise: -91 dBm
frequency: 2457 MHz
noise: -92 dBm
frequency: 2462 MHz
noise: -95 dBm
frequency: 2467 MHz
noise: -95 dBm
frequency: 2472 MHz
noise: -94 dBm

@Aleksandr_Shilov

Unfortunately, this feature is not available, as least in the publicly available SDK.
A commercial customer or an NDA might be able to request for this feature.