Converting CSQ to dBm

In your GSM/3G modem when you type:

AT+CSQ

It will returns a value (0-31) representing the signal quality:

To convert this number to dBm you need to use this simple formula:

dBm = -113 + N * 2 (where N is the returned value).

http://www.gprsmodems.co.uk/images/csq1.pdf

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