Unable to achieve power and range using nrf21540 FEM module with nrf52840

RE: Unable to achieve power and range using nrf21540 FEM module with nrf52840

Kenneth — Tue, 27 Aug 2024 21:07:33 GMT

Have you measured the output power here (for instance using a spectrum analyzer), to ensure you have the same output power between the DK and your board? I am thinking if it's possible one is actually also transmitting at a higher power than the other. Though I am not entirely sure how that should be the case if you are building the same project for both boards.

Kenneth

RE: Unable to achieve power and range using nrf21540 FEM module with nrf52840

Vignesh R — Mon, 26 Aug 2024 15:21:48 GMT

[quote userid="2111" url="~/f/nordic-q-a/114106/unable-to-achieve-power-and-range-using-nrf21540-fem-module-with-nrf52840/499406"]Have anyone at Nordic reviewed your schematic and layout?[/quote]

No, not yet. I will create a private ticket for the review

And I tried removing all the 6 config's that I mentioned above in prj.conf, now the consumption is comparable, but still it is 15-20 mA higher than that of the DK.

Is there any other thing I have to configure/set other than the mentioned overlay file changes in order to access the fem module??

Also are there any significant impacts I might see by supplying 1.8v instead of 3v to fem??

RE: Unable to achieve power and range using nrf21540 FEM module with nrf52840

Kenneth — Thu, 22 Aug 2024 14:36:42 GMT

Hello,

Have anyone at Nordic reviewed your schematic and layout? If not, I suggest to start there. Please make a new private ticket for that.

Kenneth