https://devzone.nordicsemi.com/f/nordic-q-a/18233/nrf51422-qfaa-with-bal-nrf01d3Hello, I am developing a board, with nrf51422-qfaa chip. To match the antenna I&#39;m using the BAL-NRF01D3 balun. I currently have problems with antenna not working and I&#39;m trying to &quot;debug&quot; the hardware. I discovered that my antenna trace is shorted toen-USTelligent Community 13Fri, 09 Dec 2016 13:24:12 GMThttps://devzone.nordicsemi.com/thread/70399?ContentTypeID=1Fri, 09 Dec 2016 13:24:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d884402f-d3b2-45a7-876f-5432cdd1b72apitersk<p>Thank you for the answer! It finally worked, but the fault was very trivial. The 16 MHz oscillator footprint was mirrored, so after soldering in correct position (rotated 90 deegrees) everything worked. I&#39;m pleasantly surprised that the bluetooth signal power shown in nrf Master Control Panel is around -32 dBm. From the app running on the dev-board I got around -60 dBms ;)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/70398?ContentTypeID=1Fri, 09 Dec 2016 09:43:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9db93de9-327c-4621-8e13-8a535ba7f383FormerMember<p>It should work fine to use a balun. But, as you know, it is very small, so one have to be very careful to avoid any short.</p> <p>Also, what does your layout look like, is it a copy of the reference layout? It is very important to copy the RF part of the reference layout. It means that there should be a lot of ground, and the distances in your layout should be the same as in our reference layout.</p> <p>Do you have a long transmission line towards the antenna? If so, it&#39;s important to make sure that the transmission line is a 50 Ohm transmission line (coplanar waveguide).</p><div style="clear:both;"></div>