I do use the AB02S-GPS as sender and ESP32V2 as receiver strictly unidirectional.
It works fine with spreading factors up to 10 but not 11 & 12.
Is this a known problem? Anyone faced the same challenge.
Any advice is highly welcomed…
AB02S-GPS:
#define RF_FREQUENCY 868000000 // Hz
#define TX_OUTPUT_POWER 20 // dBm
#define LORA_BANDWIDTH 0 // 0: 125 kHz,
#define LORA_SPREADING_FACTOR 10 // [SF7…SF12]
#define LORA_CODINGRATE 4 // 4:4/8
#define LORA_PREAMBLE_LENGTH 8 // Same for Tx and Rx
#define LORA_SYMBOL_TIMEOUT 0 // Symbols
#define LORA_CRC_ON true // CRC true/false
#define LORA_FIX_LENGTH_PAYLOAD_ON false
#define LORA_IQ_INVERSION_ON false
Radio.SetChannel( RF_FREQUENCY );
Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
LORA_SPREADING_FACTOR, LORA_CODINGRATE,
LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
LORA_CRC_ON, 0, 0, LORA_IQ_INVERSION_ON, TX_TIMEOUT_VALUE);
Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON,
0, LORA_CRC_ON, 0, 0, LORA_IQ_INVERSION_ON, true );
Radio.SetSyncWord(0x1424); // 0x12);
ESP32-V2:
Heltec.begin(false /DisplayEnable Enable/,
true /LoRa Disable/,
false /Serial Enable/,
true /PABOOST Enable/,
868E6 /long BAND/);
LoRa.enableCrc(); // instead: disableCrc()
LoRa.setCodingRate4(8);
LoRa.setPreambleLength(8);
LoRa.setSignalBandwidth(125E3);
LoRa.setSpreadingFactor(10); // 12 not working with LilyGo-T-Beam-1.1 instead of 7
LoRa.setSyncWord(0x12); // standard: 0x12 0x34
LoRa.setTxPower(20,RF_PACONFIG_PASELECT_PABOOST);