Hi， BR JE_Dialog

I use DA14580DEVKT-B to test BLE-UART, and check the signal strength scale with DSPS on an Android phone.
DSPS indicate the signal strength scale is only 3 level(full level is 5) from DA14580DEVKT-B，then the phone
can not receive the signal from DA14580DEVKT-B out of 4 meters.

I want to know what result in the small signal, DA14580DEVKT-B or DSPS?

Can you give some advice about increasing the signal quality in the test environment i.e. DA14580DEVKT-B and DSPS？