TX functionality test

The %XRFTEST TX test enables the RF transmitter with the given parameters. It also returns the internal measurement result of TX power. OFF <operation> disables the RF transmitter.

Using high TX power levels results in high current consumption. This should be considered in the power supply setup, especially if several products are tested in parallel.

Note: Starting the %XRFTEST TX test with a high power level causes RF disturbance that might interfere with other cellular users. Using an RF shielded chamber for this kind of testing is recommended.

nRF9151 responds to the %XRFTEST TX test with the measured TX power at the antenna. The power level is given in the q4 (dBm) format. Dividing the result by 2⁴ = 16 gives the dBm value of the antenna power.

The following command example executes a TX test:

%XRFTEST=1,1,5,8300,17,0,3,12,0,0,0,0,0 // TX ON (B5,830.0MHz,+17dBm, NB1,BPSK,12 tones, tonestart position 0, subcarrier spacing 15kHz, system BW NB1, NB index 0, TX burst mode disabled)
%XRFTEST: 271	// Result: 271/16 = 16.9dBm OK

%XRFTEST=1,0	// TX OFF OK

The TX functionality test input parameters are described in the following table:

Table 1. Input parameters of TX functionality test
Parameter name	Parameter description	Range	Value description
<param0>	3GPP band number DECT NR+ band number	1–256	Bands supported by nRF9151
<param1>	Frequency 100 kHz raster DECT NR+ carrier number	6000–22000	Corresponds to 600–2200 MHz
<param2>	TX signal power	+23 to –50	TX signal power at the antenna (dBm)
<param3>	System mode	0, 1, or 10	NB1 = 0 M1 = 1 DECT NR+ = 10
<param4>	Modulation	0–5	TX signal properties. Available options depend on the selected system mode.
<param5>	Resource Block (RB)/Tone count	1–12	TX signal properties. Available options depend on the selected system mode.
<param6>	RB/Tone start position	0–47	TX signal properties. Available options depend on the selected system mode.
<param7>	Subcarrier spacing	0–1	TX signal properties. Available options depend on the selected system mode. Not applicable for DECT NR+.
<param8>	System bandwidth	0–6	TX signal properties. Available options depend on the selected system mode. Not applicable for DECT NR+.
<param9>	Narrowband index	0–15	TX signal properties. Available options depend on the selected system mode. Not applicable for DECT NR+.
<param10>	TX burst mode	0–1	TX signal properties. Enables non-continuous TX transmission. Not applicable for DECT NR+.

For details on parameters supported by each modem firmware release, see nRF91x1 Production Test AT Commands.

For bands supported by nRF9151, see nRF9151 Product Specification.

For more information on TX testing with the %XRFTEST AT command, see TX test %XRFTEST in nRF91x1 Production Test AT Commands Reference Guide.