Reduce coverage range of nRF51822..

[KETAN_PATEL]

Hi, I am using SDK v8.0.0 , Softdevice s110 and Example is ble_app_uart(peripheral).

i want to reduce a range of nRF51822 beacon(PCA20006) up to 2-3meter..

i try this sd_ble_gap_tx_power_set() is defined in BLE_GAP.h and also try NRF_RADIO->TXPOWER=int8_t but it not working. so where i want to see for reduce a range.

is that possible to reduce a range and if yes then How?

[endnode]

You need to use one of allowed values (depending on chip, nRF51 should support +4, 0, -4, -8, -12, -16, -20 and -40) as sd_ble_gap_tx_power_set function parameter.

[endnode]

Also it might very well be reality. If your "listener" has sensitivity close to any modern properly tuned RF chip then it obviously sees your device even it advertises at -40dBm because it has sensitivity down to -80/-90/-100dBm... Can you plot measured RSSI by some reference device (anything will do the job, e.g. mobile phone with nRF Connect app) and see that tuning Tx Power down has some effect?