Semtech SX1261 - Radio Settings Configuration; LORA Modulation Settings; GFSK Modulation Settings

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Semtech
Wireless & Sensing Products
User Guide for the SX1261 and SX1262 Development Kits Rev 1.1
UG.DEV.SX126x.W.APP March 2018
6. Radio Settings
The radio settings available depend upon the modulation, denoted Mod in the sub-menu Radio Settings. For
each modem you can modify the modulation and power parameters. Registered settings are proper to each
modulation.
6.1 LORA Modulation
The radio settings available for LORA modulation are:
- Frequency (Freq) as described in Section 6.3
- Payload (PL): size of the payload between 1 and 64 bytes
- Transmission Power (Tx Pow): in steps of 1 dBm
o from -17 dBm to +15 dBm for the SX1261
o from -10 dBm to +22 dBm for the SX1262
- Param 1: Spreading Factor between SF5 and SF12
- Param 2: BandWidth (BW) from 7 kHz to 500 kHz
- Param 3: Coding Rate (CR) of the Forward Error Correction applied to the
packet of either CR 4/5, 4/6, 4/7 or 4/8
- Param 4: Packet type of either Variable length or Fixed length
6.2 GFSK Modulation
The radio settings available for GFSK modulation are:
- Frequency (Freq) as described in Section 6.3
- Payload (PL): size of the payload between 1 and 64 bytes
- Transmission Power (Tx Pow): in steps of 1 dBm
o from -17 dBm to +15 dBm for the SX1261
o from -10 dBm to +22 dBm for the SX1262
- Param 1: Bitrate from 0.1 kbps to250 kbps
- Param 2: Frequency deviation (Fd) between 5 and 150 kHz.
This must be set realistically in accordance with the bitrate
- Param 3: Tx Modulation Filtering (Gaussian, RC, RRC) with BT from 0.3 to 1
- Payload: BandWidth (BW) from 4.8 kHz to 467 kHz
Note:
Certain settings will appear in red if they are not compatible and cannot be handled by the radio. Refer to the
SX1261/2 Data Sheet to see the relationship details between bitrate, frequency deviation and bandwidth.
Figure 9: LORA Radio Settings Display
Figure 10: GFSK Radio Settings Display