The set command measures Signal-to-Noise Ratio (SNR).
To measure SNR correctly, the Carrier Wave (CW) offset must be +330 kHz for the LTE-M mode and +45 kHz for the Narrowband Internet of Things (NB-IoT) mode.
Syntax:
%XRFTEST=<test>,<operation>,<param0>,<param1>,…,<param4>
The set command parameters and their defined values are the following:
Valid range from −127 dBm to −25 dBm
Valid range 0–1. NB-IoT (0) or LTE-M (1).
1 – Enable
0 – Disable
If <param4> is not given, AFC correction is disabled.
Response syntax:
%XRFTEST: <snr>,<antenna_power>
The response parameters and their defined values are the following:
The following command example enables the RX SNR measurement and RF receiver for Band 1, 2140.0 MHz, −65 dBm, LTE-M mode, AFC correction enabled:
AT%XRFTEST=3,1,1,21400,-65,1,1
%XRFTEST: 496,-17002
OK