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Tool/software:
Since over a year we tried to get our device that so far has failed through certification but so far without success.
We failed the certification in Taiwan for FCC and IC since then I measured the device here again in Germany and found out something interesting.
We tried to copy the design fro the Daughtercard https://www.ti.com/tool/WL1837MODCOM8I
If I only load the firmware onto the WL1837 it is already showing a very high 4.8GHz peak (WL1837 nur Firmware aufgespielt). If I do the same on the WL1835 it is not present that obvious.
If I start the TX Mode with 30dBm on the WL1835 and WL1837 the vertical and horizontal differ and I tried to capture the highest peak on the 4.8GHz.
Can you probably help on this issue? Is it maybe due to faulty firmware? (firmware and configfiles you find attached)
I do not know how to proceed on this matter, but I would try to find maybe a better matching circuit or analyze the Layout with you, but frankly, hopefully it is just a firmware problem.
Attached you find some plots of the WL1835 and WL1837 on the same layout and components surrounding them. but the one device passed the other one (WL1837) didn.t.
Can you help on this issue?
Hi Dylan,
not yet no, until now I never created a script but isn´t there one, that does already tell the module, that it is a WL1837 since there are files in the attached folder, that are marked as WL1837 FCC IC and so on?
Can someone help me create such a modified script or support me in doing so?
We had another product with the WL1835 and WL1837, which did not emit over limit though, so we figured something else is wrong.
Thank you and best regards,
Samuel
Hey Samuel,
That post is fairly old, so it is likely we just added a parameter in the INI file to apply this setting by default. It is concerning that you didn't have issues in the past with these Modules and now you are. Is this design identical from the times you were able to pass FCC? I'm wondering if the issue could be HW related.
Hi Dylan,
yes it is another layout but same schematic and cpu.
from the device in question, your colleagues from germany have the layout, I can send them the layout from the device that has passed as well.
the person in question will get (or has got) in touch with you.
best regards,
Samuel
Hi Dylan,
I'm the TI FAE supporting Samuel with this request and I just sent the design files to you via e-mail.
Thanks,
Marinus