https://devzone.nordicsemi.com/f/nordic-q-a/124785/50-ohms-coplanarI am new to Nordic and want to design with the nRF52840. I have read this guide: used AppCAD to find the best width and clearance for the ground layer, but when I downloaded the default example: https://nsscprodmedia.blob.core.windows.net/prod/softwareen-USTelligent Community 13Fri, 17 Oct 2025 06:39:20 GMThttps://devzone.nordicsemi.com/thread/551772?ContentTypeID=1Fri, 17 Oct 2025 06:39:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0ad9294-4499-4f69-b3d9-505f5472d48bJONATHAN LL<p>Have not seen this issue, thanks for informing.<br /><br />Regards,<br />Jonathan&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/551668?ContentTypeID=1Thu, 16 Oct 2025 07:51:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf2a64cb-c7e0-46f7-ac5c-ddd3972fb911zolfaghari<p>Thank you.<br data-start="10" data-end="13" /> I set <strong data-start="19" data-end="24">T</strong> to <strong data-start="28" data-end="37">0.053</strong>.</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1760600869279v1.png" alt=" " /></p> <p>and the APPCAD error the T out of range but when use the online calculator or saturn&nbsp; its work very well&nbsp;</p> <p><br /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/pastedimage1760600963678v3.png" alt=" " /></p> <div class="flex max-w-full flex-col grow"> <div dir="auto" data-message-author-role="assistant" data-message-id="457ebf52-e999-4060-b270-6213a6c5e3f4" data-message-model-slug="gpt-5"> <div> <div class="markdown prose dark:prose-invert w-full break-words light markdown-new-styling"> <p data-start="0" data-end="127" data-is-last-node="" data-is-only-node="">And APPCAD shows an error saying <strong data-start="33" data-end="53">&ldquo;T out of range&rdquo;</strong>, but when I use the online calculator or Saturn, it works perfectly fine.</p> </div> </div> </div> </div> <div></div> <div class="mt-3 w-full empty:hidden"> <div class="text-center"> <div> <div class="inline-flex border border-gray-100 dark:border-gray-700 rounded-xl"> <div class="text-token-text-secondary flex items-center justify-center gap-4 px-4 py-2.5 text-sm whitespace-nowrap"></div> </div> </div> </div> </div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/551559?ContentTypeID=1Wed, 15 Oct 2025 10:44:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:afb4d9c2-e7f7-40ec-b757-56c787cd7e1bJONATHAN LL<p>Try changing the thickness T to&nbsp;<span>0.053.</span><br /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1760524951970v1.png" alt=" " />&nbsp;<br /><br /><br />Here is a calculation with Saturn<br /><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1760525027116v2.png" alt=" " /><br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/550771?ContentTypeID=1Tue, 07 Oct 2025 08:16:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c69486d-3ec2-4b4b-87dc-bcf8193816fdzolfaghari<div><span>In the AppCAD calculator, I set the value to 4.6. In Altium, the value is 4.8 in the Stack Manager and verified the H and PCB material settings. Please confirm if 1.6 mm is correct for H and FR4 is correct for the dielectric. If these values are correct, the pad width and gap seem to be incorrect.</span></div><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/550694?ContentTypeID=1Mon, 06 Oct 2025 12:02:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:30e0bf3d-ce1e-4eb9-9e35-c872d60a2773JONATHAN LL<p>Test with Dielectric 4.8, you have it set to 4.6.<br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>