Reg rssi values in QGroundControl

#1

Hi everyone,

Does anyone know the logic of the values displayed as Telemetry RSSI in QGroundControl?

The Local and Remote rssi shows up as negative values (say -1 or so) whereas in RFD Modem Tools software, the values are displayed in the range of 240 if the air and ground module are close to each other. I can use the latter values to calculate the estimated range for a given telemetry configuration. But I cannot access the RFD Modem tool software if I am accessing the com port through QGroundControl.

Regards,

1 Like
#2

I suppose they are similar to WIFi RSSI values.

It is very normal to see negative value. Best signal strength ever should not surpass 0

I think that positive value of signal strength can not exist. Maybe what you see in the software is either a bug, or the real values are passed into a mathematical function for some reason.

Take a look at this article:

#3

Hi @shrit,

Thank you very much for your reply. However I think I found the answer I was looking for in the below snapshot found in this link: http://ardupilot.org/copter/docs/common-3dr-radio-advanced-configuration-and-technical-information.html

I had found the range calculation formula before but I did not connect this formula to the RFD modem tools value until now.

btw does any one know how to measure/access the rate at which the RX errors increase? I am asking this because the value reported is a cumulative value rather than an instantaneous value.

Regards,