https://devzone.nordicsemi.com/f/nordic-q-a/119545/current-reach-100ma-when-using-nrf21540-femHi, I have two nRF52833 DKs and both of them has connected to nRF21540 EK. I set the transmitter sending out 244 bytes data without stopping and measure it&#39;s current. The setup is like below and the average current is around 60 mA at 1.8V ... en-USTelligent Community 13Wed, 05 Mar 2025 10:34:02 GMThttps://devzone.nordicsemi.com/thread/525932?ContentTypeID=1Wed, 05 Mar 2025 10:34:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f0bd69d2-70f6-4bcd-840e-965b96e0ac5bZiyao Zhou<p>Thank you so much for your information!&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/525927?ContentTypeID=1Wed, 05 Mar 2025 10:23:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:84cbd202-2e36-444d-bb5c-5941698955a6ketiljo[quote user=""]I have no clue about this, as I expect the power has no relationship with antenna[/quote] <p>The PA is designed for a 50 ohm load. When you unplug the antenna, there will be severe missmatch&nbsp;since the impedance the PA sees into the connector is very high. All power that&#39;s sent into the antenna is reflected back into the PA when there&#39;s no antenna presen. You may damage the device if you operate it without the antenna.</p><div style="clear:both;"></div>