from which antenna these values were derived resp. measured? e.g. there is a pcb antenna and a hirose u.fl connector available on pca10040...
examples/ble_peripheral/ble_app_eddystone/es_app_config.h:
#ifdef NRF52_SERIES #define APP_CONFIG_CALIBRATED_RANGING_DATA {-49, -39, -29, -24, -19, -14, -9, -7, -5} //!< Calibrated TX power at 0 m. See the nRF52 Product Specification for corresponding TX values. #elif NRF51 #define APP_CONFIG_CALIBRATED_RANGING_DATA {-39, -26, -23, -18, -13, -12, -9, -2} //!< Calibrated TX power at 0 m. See the nRF51 Product Specification for corresponding TX values. #else #error MISSING CALIBRATED DATA #endif