https://devzone.nordicsemi.com/f/nordic-q-a/73038/bt840e-weak-reception-signal-as-centralSorry this is an urgent request and we could not find much information on the internet about this module. We have a tight schedule so it might be a good idea to post here. . We are using Fanstel BT840E as the central in the gateway. We chose BT840Een-USTelligent Community 13Mon, 22 Mar 2021 09:37:59 GMThttps://devzone.nordicsemi.com/thread/301146?ContentTypeID=1Mon, 22 Mar 2021 09:37:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:85eabcb8-9ca5-4fd8-859e-4f1afdab8d4cawneil<p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/1261._5F00_Verify_2D00_answer_2D00_nordic_5F00_2.png" /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301087?ContentTypeID=1Sun, 21 Mar 2021 15:48:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d0167c86-25c4-4782-aa65-c54ed02a8264davidz<p>OMG, thanks so much Daniel. We did use a u.FL to SMA pigtail connector and tried several antennas. It turns out that all the different antennas we used have RP-SMA connectors.&nbsp;</p> <p>We did not suspect this because if we took off the u.FL connector, then BT840E could not receive any signals. So we always thought that the antennas are working.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301064?ContentTypeID=1Sun, 21 Mar 2021 10:20:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:884e2b66-8886-40c8-8f3b-4aac6c99c5b4Daniel Chisholm<p>15-20d<strong></strong>B is about what you lose when you have no antenna connected at all (i.e. just an empty u.FL connector).&nbsp; Do you see a similar signal strength if you have no antenna attached?</p> <p>Also, if you are using a u.FL to SMA pigtail, and connect an RP-SMA antenna or cable to that, there will be no centre pin present, so even though connectors are mechanically attached they are not electrically attached.</p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301054?ContentTypeID=1Sat, 20 Mar 2021 15:25:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc40824b-5694-47c8-b786-e0a66e8cdbd4davidz<p>Yes we did. In the mean time, if somebody has experiences on this, then it will be great. We are in tight schedule.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301042?ContentTypeID=1Sat, 20 Mar 2021 11:31:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:839faf0f-5c41-46a7-939a-32a0507a8732awneil<p>So have you contacted <strong>Fanstell</strong> for support ?</p><div style="clear:both;"></div>