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12. Test Commands
Several LR1121 test commands allow an easy configuration of the device for regulatory ETSI or FCC compliance.
12.1 Regulatory Overview
This section only describes the RF modes necessary for ETSI and FCC regulatory testing. Please refer to the ETSI and FCC
documents for a detailed test description and for the test limits indication.
12.1.1 ETSI
The EN 300 220 standards describe 4 test signals which the EUT (Equipment Under Test) must be able to transmit for CE
certification. These test signals are listed in the table hereafter, with the operating mode correspondence for the LR1121.
Table 12-1: ETSI Test Signals
Test Signal
D-M1
Continuously modulated signal with the greatest
D-M2
D-M2a
Same as D-M2 signal, but not continuous
D-M3
Normal operating mode of the EUT in the application
The user should be able to modify the operating frequency, output power, and modulation parameters for the ETSI tests.
The user should also be able to receive the incoming RF packets for any configuration (frequency, modulation parameters),
and to determine a PER (Packet Error Rate) indication of the receive quality.
All this can be done using the regular LR1121 radio commands.
12.1.2 FCC
The FCC part 15.247 is applicable to frequency hopping and digitally modulated systems. For those tests, only an
unmodulated carrier (TX CW) and a regular packet transmission are required.
The user should be able to modify the operating frequency, output power, and modulation parameters for the FCC tests.
This can be done using the regular LR1121 radio commands.
LR1121
User Manual
Rev 1.1
UM.LR1121.W.APP
Mar 2023
Description
Unmodulated carrier
occupied RF bandwidth
www.semtech.com
LR1121 Operation
TX CW mode (SetTxCw(...) command)
Continuous modulation
(SetTxInfinitePreamble(...) command)
RF packet transmission: LoRa SF12, BW500, 50% duty
cycle
Operation as in the application
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