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Jan Gromeš edited this page Jan 5, 2022 · 18 revisions

This page shows all the parameters set by default to radio modules and wireless protocols. These parameters will be set after calling module/protocol begin() method with no arguments provided. Modules/protocols without default argument values are not listed.

NOTE: Only the parameters changed by RadioLib are listed here. In addition, the module/protocol may also have other parameters, configuration of which is not implemented in RadioLib. These are not listed on this page - consult the module datasheet or protocol specification.

Overview

FSK modules

The table below shows default values of parameters that are common accross all sub-GHz FSK modules.

Module type Carrier frequency Bit rate Frequency deviation Receiver bandwidth Output power Preamble length
CC1101 434.0 MHz 4.8 kbps 5.0 kHz 135.0 kHz 10 dBm 16 bits
RF69 434.0 MHz 4.8 kbps 5.0 kHz 125.0 kHz 10 dBm 16 bits
SX1231 434.0 MHz 4.8 kbps 5.0 kHz 125.0 kHz 10 dBm 16 bits
Si443x 434.0 MHz 4.8 kbps 5.0 kHz 181.1 kHz 10 dBm 16 bits
RFM2x 434.0 MHz 4.8 kbps 5.0 kHz 181.1 kHz 10 dBm 16 bits
SX126x 434.0 MHz 4.8 kbps 5.0 kHz 156.2 kHz 10 dBm 16 bits
SX1272/73 915.0 MHz 4.8 kbps 5.0 kHz 125.0 kHz 10 dBm 16 bits
SX1276/77/78/79 434.0 MHz 4.8 kbps 5.0 kHz 125.0 kHz 10 dBm 16 bits
RFM95/97 915.0 MHz 4.8 kbps 5.0 kHz 125.0 kHz 10 dBm 16 bits
RFM96/98 434.0 MHz 4.8 kbps 5.0 kHz 125.0 kHz 10 dBm 16 bits

LoRa modules

The table below shows default values of parameters that are common accross all sub-GHz LoRa modules.

Module type Carrier frequency Bandwidth Spreading factor Coding rate Sync word Output power Preamble length
SX126x 434.0 MHz 125.0 kHz 9 4/7 private network 10 dBm 8 symbols
SX1272/73 915.0 MHz 125.0 kHz 9 4/7 private network 10 dBm 8 symbols
SX1276/77/78/79 434.0 MHz 125.0 kHz 9 4/7 private network 10 dBm 8 symbols
RFM95/97 915.0 MHz 125.0 kHz 9 4/7 private network 10 dBm 8 symbols
RFM96/98 434.0 MHz 125.0 kHz 9 4/7 private network 10 dBm 8 symbols

Modules

Legend:

  • Begin method - parameters configurable via begin() method.
  • Other - parameters which are not part of the begin() method, but can be configured using some other method from the library public API.
  • Inaccessible - parameters which can not be changed by the user.
  • Equivalent to - pseudo-code of calls to configuration methods that will result in the same configuration as the default.

CC1101

  • Begin method:
    • Carrier frequency: 434.0 MHz
    • Bit rate: 4.8 kbps
    • Frequency deviation: 5.0 kHz (single-sideband)
    • Receiver bandwidth: 135.0 kHz
    • Output power: 10 dBm
    • Preamble length: 16 bits
  • Other:
    • Packet length mode: variable, maximum of CC1101_MAX_PACKET_LENGTH bytes (length byte included in packet)
    • Sync word: 0x12 0xAD, 0 error bits, carrier sense above threshold not required
    • Data shaping B-T product: 0 (plain 2-FSK, no Gaussian filter applied)
    • Encoding: NRZ (non-return to zero - no encoding)
  • Inaccessible: -

Equivalent to:

CC1101::begin(434.0, 4.8, 5.0, 135.0, 10, 16);
CC1101::variablePacketLengthMode(CC1101_MAX_PACKET_LENGTH);
CC1101::setSyncWord(0x12, 0xAD, 0, false);
CC1101::setDataShaping(RADIOLIB_SHAPING_NONE);
CC1101::setEncoding(RADIOLIB_ENCODING_NRZ);

nRF24

  • Begin method:
    • Carrier frequency: 2400 MHz
    • Data rate: 1000 kbps
    • Output power: -12 dBm
    • Address width: 5 bytes
  • Other:
    • CRC: enabled (16-bit CRC)
    • Auto-acknowledgement: enabled (all pipes)
  • Inaccessible:
    • Retries: 15
    • Retry delay: 1500 us
    • Dynamic payloads: enabled
    • Payload with ACK packets: disabled
    • Dynamic ACK: disabled

Equivalent to:

nRF24::begin(2400, 1000, -12, 5);
nRF24::setCrcFiltering(true);
nRF24::setAutoAck(true);

RF69/SX1231

  • Begin method:
    • Carrier frequency: 434.0 MHz
    • Bit rate: 4.8 kbps
    • Frequency deviation: 5.0 kHz (single-sideband)
    • Receiver bandwidth: 125.0 kHz
    • Output power: 10 dBm
    • Preamble length: 16 bits
  • Other:
    • Packet length mode: variable, maximum of RF69_MAX_PACKET_LENGTH bytes (length byte included in packet)
    • Sync word: 0x12 0xAD
    • Data shaping B-T product: 0 (plain 2-FSK, no Gaussian filter applied)
    • Encoding: NRZ (non-return to zero - no encoding)
    • CRC: enabled
    • Address filtering: disabled
    • AES encryption: disabled
  • Inaccessible:
    • Over-current protection: enabled
    • Automatically clear packet on CRC mismatch: enabled

Equivalent to (assuming RF69):

RF69::begin(434.0, 4.8, 5.0, 125.0, 10, 16);
RF69::variablePacketLengthMode(RF69_MAX_PACKET_LENGTH);
uint8_t syncWord[] = {0x12, 0xAD};
RF69::setSyncWord(syncWord, 2);
RF69::setDataShaping(RADIOLIB_SHAPING_NONE);
RF69::setEncoding(RADIOLIB_ENCODING_NRZ);
RF69::setCrcFiltering(true);
RF69::disableAddressFiltering();
RF69::disableAES();

Si443x/RFM2x

  • Begin method:
    • Carrier frequency: 434.0 MHz
    • Bit rate: 4.8 kbps
    • Frequency deviation: 5.0 kHz (single-sideband)
    • Receiver bandwidth: 181.1 kHz
    • Output power: 10 dBm
    • Preamble length: 16 bits
  • Other:
    • Sync word: 0x12 0xAD
    • Data shaping B-T product: 0 (plain 2-FSK, no Gaussian filter applied)
    • Encoding: NRZ (non-return to zero - no encoding)
  • Inaccessible:
    • Packet header: disabled
    • Broadcast address check: disabled

Equivalent to (assuming Si4432):

Si4432::begin(434.0, 4.8, 5.0, 181.1, 10, 16);
uint8_t syncWord[] = {0x12, 0xAD};
Si443x::setSyncWord(syncWord, 2);
Si443x::setDataShaping(RADIOLIB_SHAPING_NONE);
Si443x::setEncoding(RADIOLIB_ENCODING_NRZ);

SX126x - LoRa modem

  • Begin method:
    • Carrier frequency: 434.0 MHz
    • Bandwidth: 125.0 kHz (dual-sideband)
    • Spreading factor: 9
    • Coding rate: 4/7
    • Sync word: SX126X_SYNC_WORD_PRIVATE (0x12)
    • Output power: 10 dBm
    • Preamble length: 8 symbols
    • TCXO reference voltage: 1.6 V (SX126x module with TCXO)
    • LDO regulator mode: disabled (SX126x module with DC-DC power supply)
  • Other:
    • Over-current protection: 60.0 mA
    • DIO2 as RF switch control: enabled
    • LoRa header mode: explicit
    • LoRa CRC: enabled, 2 bytes
  • Inaccessible:
    • Number of CAD symbols: 8

Equivalent to:

SX126x::begin(434.0, 125.0, 9, 7, SX126X_SYNC_WORD_PRIVATE, 10, 8, 1.6, false);
SX126x::setCurrentLimit(60.0);
SX126x::setDio2AsRfSwitch(true);
SX126x::explicitHeader();
SX126x::setCRC(2);

SX126x - FSK modem

  • Begin method:
    • Carrier frequency: 434.0 MHz
    • Bit rate: 4.8 kbps
    • Frequency deviation: 5.0 kHz (single-sideband)
    • Receiver bandwidth: 156.2 kHz
    • Output power: 10 dBm
    • Preamble length: 16 bits
    • TCXO reference voltage: 1.6 V (SX126x module with TCXO)
    • LDO regulator mode: disabled (SX126x module with DC-DC power supply)
  • Other:
    • Packet length mode: variable, maximum of SX126X_MAX_PACKET_LENGTH bytes (length byte included in packet)
    • Sync word: 0x12 0xAD
    • Data shaping B-T product: 0 (plain 2-FSK, no Gaussian filter applied)
    • Encoding: NRZ (non-return to zero - no encoding)
    • Over-current protection: 60.0 mA
    • DIO2 as RF switch control: enabled
  • Inaccessible: -

Equivalent to (assuming SX1268):

SX1268::beginFSK(434.0, 4.8, 5.0, 156.2, 10, 16, 1.6, false);
SX126x::variablePacketLengthMode(SX126X_MAX_PACKET_LENGTH);
uint8_t syncWord[] = {0x12, 0xAD};
SX126x::setSyncWord(syncWord, 2);
SX126x::setDataShaping(RADIOLIB_SHAPING_NONE);
SX126x::setEncoding(RADIOLIB_ENCODING_NRZ);
SX126x::setCurrentLimit(60.0);
SX126x::setDio2AsRfSwitch(true);

SX127x/RFM9x - LoRa modem

  • Begin method:
    • Carrier frequency: 434.0 MHz (for SX1276/77/78/79 and RFM96/98) or 915.0 MHz (for SX1272/73 and RFM95/97)
    • Bandwidth: 125.0 kHz (dual-sideband)
    • Spreading factor: 9
    • Coding rate: 4/7
    • Sync word: SX127X_SYNC_WORD (0x12)
    • Output power: 10 dBm
    • Preamble length: 8 symbols
    • Gain: 0 (automatic gain control enabled)
  • Other:
    • Over-current protection: 60 mA
    • LoRa CRC: enabled
    • LoRa header mode: explicit
  • Inaccessible:
    • Frequency hopping: disabled

Equivalent to (assuming SX1278):

SX1278::begin(434.0, 125.0, 9, 7, SX127X_SYNC_WORD, 10, 8, 0);
SX1278::setCurrentLimit(60);
SX1278::setCRC(true);
SX1278::explicitHeader();

SX127x/RFM9x - FSK modem

  • Begin method:
    • Carrier frequency: 434.0 MHz (for SX1276/77/78/79 and RFM96/98) or 915.0 MHz (for SX1272/73 and RFM95/97)
    • Bit rate: 4.8 kbps
    • Frequency deviation: 5.0 kHz (single-sideband)
    • Receiver bandwidth: 125.0 kHz
    • Preamble length: 16 bits
    • Output power: 10 dBm
    • OOK modulation: disabled
  • Other:
    • Packet length mode: variable, maximum of SX127X_MAX_PACKET_LENGTH bytes (length byte included in packet)
    • Sync word: 0x12 0xAD
    • Data shaping B-T product: 0 (plain 2-FSK, no Gaussian filter applied)
    • Encoding: NRZ (non-return to zero - no encoding)
    • CRC: enabled
    • Over-current protection: 60 mA
    • Address filtering: disabled
    • RSSI measurement configuration: 2^(1 + 2) samples, offset 0 dBm
  • Inaccessible:
    • Automatically clear packet on CRC mismatch: enabled
    • Preamble polarity: 0x55 (start with 0)
    • Preamble detector: enabled, 2 bytes

Equivalent to (assuming SX1278):

SX1278::beginFSK(434.0, 4.8, 5.0, 125.0, 10, 16, false);
SX127x::variablePacketLengthMode(SX127X_MAX_PACKET_LENGTH);
uint8_t syncWord[] = {0x12, 0xAD};
SX127x::setSyncWord(syncWord, 2);
SX1278::setDataShaping(RADIOLIB_SHAPING_NONE);
SX127x::setCurrentLimit(60);
SX127x::setEncoding(RADIOLIB_ENCODING_NRZ);
SX1278::setCRC(true);
SX127x::disableAddressFiltering();
SX127x::setRSSIConfig(2, 0);

SX128x - LoRa modem

  • Begin method:
    • Carrier frequency: 2400.0 MHz
    • Bandwidth: 812.5 kHz (dual-sideband)
    • Spreading factor: 9
    • Coding rate: 4/7, long interleaving disabled
    • Output power: 10 dBm
    • Preamble length: 12 symbols
  • Other:
    • LoRa header mode: explicit
    • LoRa CRC: enabled, 2 bytes
  • Inaccessible:
    • LDO regulator mode: disabled (SX128x module with DC-DC power supply)
    • Number of CAD symbols: 8

Equivalent to:

SX128x::begin(2400.0, 812.5, 9, 7, 10, 12);
SX128x::explicitHeader();
SX128x::setCRC(2);

SX128x - GFSK modem

  • Begin method:
    • Carrier frequency: 2400.0 MHz
    • Bit rate: 800 kbps
    • Frequency deviation: 400 kHz (single-sideband)
    • Output power: 10 dBm
    • Preamble length: 16 bits
  • Other:
    • Sync word: 0x12 0xAD
    • Data shaping B-T product: 0.5 (GFSK)
    • Encoding: NRZ (non-return to zero - no encoding)
    • CRC: enabled, 2 bytes, initial 0x1D0F, polynomial 0x1021
  • Inaccessible:
    • Packet length mode: variable, maximum of SX128X_MAX_PACKET_LENGTH bytes (length byte included in packet)
    • LDO regulator mode: disabled (SX128x module with DC-DC power supply)

Equivalent to:

SX128x::beginGFSK(2400.0, 800, 400, 10, 16);
uint8_t syncWord[] = {0x12, 0xAD};
SX128x::setSyncWord(syncWord, 2);
SX128x::setDataShaping(RADIOLIB_SHAPING_0_5);
SX128x::setEncoding(RADIOLIB_ENCODING_NRZ);
SX128x::setCRC(2, 0x1D0F, 0x1021);

SX128x - BLE modem

  • Begin method:
    • Carrier frequency: 2400.0 MHz
    • Bit rate: 800 kbps
    • Frequency deviation: 400 kHz (single-sideband)
    • Output power: 10 dBm
    • Data shaping B-T product: 0.5 (GFSK)
  • Other:
    • CRC: enabled, 3 bytes
    • Encoding: whitening
  • Inaccessible:
    • LDO regulator mode: disabled (SX128x module with DC-DC power supply)

Equivalent to:

SX128x::beginBLE(2400.0, 800, 400, 10, 0.5);
SX128x::setCRC(3);
SX128x::setEncoding(2);

SX128x - FLRC modem

  • Begin method:
    • Carrier frequency: 2400.0 MHz
    • Bit rate: 650 kbps
    • FLRC coding rate: 3/4
    • Output power: 10 dBm
    • Preamble length: 16 bits
    • Data shaping B-T product: 0.5
  • Other:
    • CRC: enabled, 2 bytes, initial 0x1D0F, polynomial 0x1021
    • Sync word: 0x2D 0x01 0x4B 0x1D
    • Encoding: NRZ (non-return to zero - no encoding)
  • Inaccessible:
    • LDO regulator mode: disabled (SX128x module with DC-DC power supply)

Equivalent to:

SX128x::beginFLRC(2400.0, 650, 3, 10, 16, 0.5);
SX128x::setCRC(2, 0x1D0F, 0x1021);
uint8_t syncWord[] = {0x2D, 0x01, 0x4B, 0x1D};
SX128x::setSyncWord(syncWord, 4);
SX128x::setEncoding(0);

Protocols

Legend:

  • Begin method - parameters configurable via begin() method.
  • Other - parameters which are not part of the begin() method, but can be configured using some other method from the library public API.
  • Inaccessible - parameters which can not be changed by the user.
  • Equivalent to - pseudo-code of calls to configuration methods that will result in the same configuration as the default.

AX.25

  • Begin method:
    • Source station callsign: no default value
    • 4-bit source station SSID: 0
    • Preamble length: 8 AX25_FLAG bytes
  • Other: -
  • Inaccessible: -

Equivalent to (assuming "N7LEM" source station callsign):

AX25Client::begin("N7LEM", 0, 8);

Hellschreiber

  • Begin method:
    • Carrier frequency: no default value
    • Baud rate: 122.5 Baud ("Feld Hell")
  • Other: -
  • Inaccessible: -

Equivalent to (assuming 434.0 MHz carrier):

HellClient::begin(434.0, 122.5);

Morse

  • Begin method:
    • Carrier frequency: no default value
    • Word rate: 20 words per minute (assuming "PARIS" as typical word)
  • Other: -
  • Inaccessible: -

Equivalent to (assuming 434.0 MHz carrier):

MorseClient::begin(434.0, 20);

RTTY

  • Begin method:
    • Base (space) frequency: no default value
    • Frequency shift between space and mark: no default value
    • Baud rate: no default value
    • Encoding: ASCII (7-bit)
    • Stop bits: 1
  • Other: -
  • Inaccessible: -

Equivalent to (assuming 434.0 MHz base, 183 Hz shift and 45 baud):

RTTYClient::begin(434.0, 183, 45, ASCII, 1);

SSTV

  • Begin method:
    • Base frequency: no default value
    • SSTV mode: no default value
    • Timing correction factor: 1.0
  • Other: -
  • Inaccessible: -

Equivalent to (assuming 434.0 MHz base and Wrasse mode):

MorseClient::begin(434.0, Wrasse, 1.0);
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