NRF51822-QFAA range issue

[CreativeBuds]

Good Afternoon,

I am using NRF51822-QFAA as ble remote in central mode. It connects to ESP32 and send the command for changing it's mode. I am using the RF module YJ-14001-NRF51822. I made small changes in ble_app_uart_c code as required. It is connecting and communicating with esp32 as required. But it works only for around 1ft to 2ft of distance.

uint32_t ret = sd_ble_gap_tx_power_set(4);
APP_ERROR_CHECK(ret); 

I tried adding the above statements after the init functions and before the main loop in int main(){}, but after adding this it is giving reliable press until 3.5ft to 4ft only.

SDK: 12.3V

softdevice: S130

this is the link for the module yj-14001: www.aliexpress.com/.../32867463734.html

could you please suggest me what i am missing and how i can improve this and get better range.

[Jared]

 Hi,

Have you tried comparing it with a nRF51 DK? Any considerable difference? 

regards

Jared

[CreativeBuds]

No i did not try with DK, i tried with an other nrf module HW651, That is giving around 10ft.

could u also tell me if the tx_power is set to +4DB it will give a better range or -40DB it will give a better range.

[Jared]

Hi,

Did you place the model on a custom board? Most likely the difference is due to your hardware design. +4dBm should give longer range as. 

regards

Jared