Alex Grachevsky
Dear community. Regarding the LoRa protocol, I have a question regarding image calibration for certain ranges. There are 5 main sub-ranges (430-440, 470-510, 779-797, 863-870 and 902-928) and the values for their calibration are presented in the table 9-2 if datasheet. I wonder if you know any information about other sub-bands (from 150 to 430 MHz)? Directly related to calibration values.
Thank you for your attention!
Hello @grachevskyalexander,
In the recent release of the SX126x driver (see https://github.com/Lora-net/sx126x_driver/), a new function was added to solve the issue you raised:
/**
* @brief Launch an image calibration valid for all frequencies inside an interval, in MHz
*
* @param [in] context Chip implementation context
* @param [in] freq1_in_mhz Image calibration interval lower bound, in MHz
* @param [in] freq2_in_mhz Image calibration interval upper bound, in MHz
*
* @remark freq1_in_mhz must be less than or equal to freq2_in_mhz
*
* @returns Operation status
*/
sx126x_status_t sx126x_cal_img_in_mhz( const void* context, const uint16_t freq1_in_mhz, const uint16_t freq2_in_mhz );
You can give the frequency range you want to use and the function will automatically compute the right parameters and send it to the chip.
Thank you so much!