nrf51822 BLE max range

[tekma]

Hello, what is the BLE max range w/out usin PCB antenna? And what range ll be if i reducing the connection interval down to the minimum 7.5ms, set Tx power to +4dBm using sd_ble_gap_tx_power_set and use 250kbps data rate? I think that range will be about 10m, is it right? Can i use 2.4GHz Ceramic Chip Antenna(such as RFANT3216120A5T fo example, power gain 2dBi), what will be the result?

Thank for reply.

[FormerMember]

The range depends on the antenna and the PCB design, the TX power, and the baudrate. In BLE, the baudrate is 1Mbps and it cannot be changed. For the antenna and the PCB, it is important that the antenna is placed according to its datasheet, and that there is as much ground as possible. In addition, as @Dave_couling says, tuning of the antenna is important in order to minimize the loss between the chip and the antenna.

The antenna you refer to should work fine.