Increasing Tx Power for LoRa transceiver llcc68 (cannot Tx over 2dBm)

[fraguia2024]

Hello,
I have a LoRa llcc68 transceiver and I'm trying to set up an infinite preamble transmission at frequency=868300000 Hz and power>=10dBm.
Despite modifying the range in llcc68_set_pa_cfg() and llcc68_set_tx_params(), it still does not reach more than 2dBm.

Here is my code, trying to obtain a transmission at power = 14dBm and frequency=868300000 Hz, but obtaining 1.98dBm:

static struct llcc68_pa_cfg_params_s LoRa_PA_CFG =
{
    .pa_duty_cycle  = 0x02,
    .hp_max         = 0x02,
    .device_sel     = 0x00,
    .pa_lut         = 0x01,
};

static const llcc68_mod_params_lora_t LoRa_mod_params =
{
    .sf   = /*LLCC68_LORA_SF9,*/ LLCC68_LORA_SF7     ,    //!< LoRa Spreading Factor // TODO KFG edited
    .bw   = LLCC68_LORA_BW_125  ,    //!< LoRa Bandwidth
    .cr   = LLCC68_LORA_CR_4_5  ,    //!< LoRa Coding Rate
    .ldro = 0                   ,    //!< Low DataRate Optimization configuration
};

static struct llcc68_pkt_params_lora_s LoRa_pkt_params =
{
     .preamble_len_in_symb  = 0x0008                    ,      //!< Preamble length in symbols
     .header_type           = LLCC68_LORA_PKT_EXPLICIT  ,      //!< Header type
     .pld_len_in_bytes      = 0x1E                      ,      //!< Payload length in bytes
     .crc_is_on             = 1                         ,      //!< CRC activation
     .invert_iq_is_on       = 0                         ,      //!< IQ polarity setup
};

main function:
{
    llcc68_set_standby(context, LLCC68_STANDBY_CFG_RC);
    llcc68_set_pkt_type(context, LLCC68_PKT_TYPE_LORA);
    llcc68_set_rf_freq(context, 868300000);
    llcc68_set_pa_cfg(context, (llcc68_pa_cfg_params_t *) &LoRa_PA_CFG);
    llcc68_set_tx_params(context, 14, LLCC68_RAMP_40_US);
    llcc68_set_rx_tx_fallback_mode(context, LLCC68_FALLBACK_STDBY_RC);
    llcc68_set_lora_mod_params(context, (llcc68_mod_params_lora_t *) &LoRa_mod_params);
    llcc68_set_lora_pkt_params(context, (llcc68_pkt_params_lora_t*) &LoRa_pkt_params);
    llcc68_set_lora_sync_word(context, 0x12);

    llcc68_set_dio2_as_rf_sw_ctrl(context, 0);
    llcc68_set_ocp_value(context, 0x38);
    llcc68_cfg_tx_clamp(context);

    llcc68_set_tx_infinite_preamble(context);
}

[HeadBoffin]

WHY????

Second question, do you realise that transmitting continuously is likely to be illegal?

[jgromes]

@fraguia2024 I think you might have posted this question in the wrong GitHub repository - the code doesn't look like RadioLib API, more like this one: https://github.com/Lora-net/llcc68_driver

However, RadioLib does include an LLCC68 driver, feel free to give that a try - of course, observing all your local legal limitations as @HeadBoffin correctly pointed out.