https://devzone.nordicsemi.com/f/nordic-q-a/22127/dk-52-matching-to-external-dipoleHi, We are range testing BLE using the DK-52 with an external dipole antenna connected via the u.fl connector. We are using the DK-52 + packet sniffer software on a laptop to observe RSSI as we move a nRF51822 smart beacon away. Tests are open fielden-USTelligent Community 13Fri, 19 May 2017 12:24:26 GMThttps://devzone.nordicsemi.com/thread/86928?ContentTypeID=1Fri, 19 May 2017 12:24:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6f662c77-b3e9-4e1d-ac32-d5835d78f786FormerMember<p>Yes, the u.fl connector is placed in the 50 Ohm reference point. If the dipole has an impedance of 70 Ohm, there will be a mismatch.</p> <p>Regarding the RSSI values: The RSSI values are given in dB, which is not a linear &quot;scale&quot;. As a rule of thumb, adding 6dB to the output power doubles the range. The same applies the other way around. For range testing, each 6dB lower RSSI, means a double range. Therefore, the RSSI values will decrease a lot in the beginning and then slower and slower.</p><div style="clear:both;"></div>