TX testing

The command enables RF transmitter with the given parameters. It also measures TX power with an internal measurement receiver in time domain, and returns the measurement result.

CAUTION:
This command transmits power to the selected RF band and may violate the radio directives of the region or country. Make sure that the equipment is in an RF-shielded room or connected to an RF cable so that RF power will not leak.

The command parameter and its value are the following:

<test>
1 – TX

TX ON

<operation>
1 – ON

TX ON has a total of seven parameters:

<param0>
3GPP band number.
<param1>
Frequency [100kHz].

Valid range 6000–22000 (corresponds to 600.0 MHz–2200.0 MHz).

<param2>
TX signal power at antenna [dBm].

Valid range from +23 to −50.

<param3>
System mode.

Valid range 0–1. NB1 (0) or M1 (1).

<param4>
Modulation.
0 – QPSK
1 – 16QAM
2 – Reserved
3 – BPSK
4 – CW
M1: QPSK, 16QAM, and CW
NB1: QPSK, BPSK, and CW
<param5>, <param6>, <param7>
<param5> RB/Tone count
<param6> RB/Tone start position
<param7> Subcarrier spacing
If <param4> = CW, then <param5>, <param6>, and <param7> = 0 (do not care)
The allowed combinations for <param5>, <param6>, and <param7> for both system mode (<param3>) values are listed in the table below:
Table 1. Allowed parameter combinations for <param5>, <param6>, and <param7> in system modes NB1 and M1
System mode <param3> RB/Tone count <param5> RB/Tone start position <param6> Subcarrier spacing <param7>
NB1 (0) 1 0–11 0
3 0, 3, 6, 9 0
6 0, 6 0
12 0 0
1 0–47 1
M1 (1) 1 0–5 0
2 0–4 0
3 0–3 0
4 0–2 0
5 0–1 0
6 0 0
Note: In system mode M1, subcarrier spacing 3.75 kHz is not allowed.

Response syntax when <operation> is ON:

%XRFTEST: <antenna_power>

The response value is the following:

<antenna_power>
Internally measured TX power at antenna, in q4 dBm. q4 means that dividing the result by 24 = 16 gives dBm.

The following command example enables the RF transmitter for Band 5, 830.0 MHz, +17 dBm, NB1, BPSK, 12 tones, tone start position 0, subcarrier spacing 15 kHz:

%XRFTEST=1,1,5,8300,17,0,3,12,0,0
%XRFTEST: 271
OK
Note: 271/16 = 16.9 dBm

TX OFF

<operation>
0 – OFF

The following command example disables the RF transmitter:

%XRFTEST=1,0
OK
Note: Always send the OFF command before sending another ON command.