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  • Case ID: 360354
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TX Power issues

Hass
Hello,
I am using WM02F WiFi mdule with nRF7002 SoC and i am having some issues with the TX power measurement of the WM02F WiFi module while operating it in 2.4GHz. 
I have tested these modules (ordered from Fanstel and Jetreq Components) on the same hardware and experiencing the different TX power in 2.4GHz band in all channels (1-14).
So, I was just wondering if there are any settings I have to change in the firmware, so both modules (from fanstel and Jetreq) have the same Tx power performance. the only difference on these modules i can see is 40MHz crystal but with difference order info.
Thankful for your guidance!
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  • 0

    Hello,

    As mentioned in my previous reply, have you had the chance to verify the output power using conducted/cabled measurements? Also, is it possible for you to share a screenshot or image of your setup as well? Can you also provide some more details about the two modules that you mentioned? Have you performed measurements with both before and is one of them made by you?

    Best Regards,

    Samruddhi

  • 0 in reply to Samruddhi Jadhav

    Hello Samruddhi,

    No! i have done only the radiated emission measurements with 1m of distance between radio module WM02F and the e-field probe, the e-filed probe was connected to the Network analyzer. The WM02F has an integrated antenna.

    I only swapped the radio module (sourced from different suppliers) on the same hardware (changed the WM02F WiFi module on same PCB) and non of theme are made by me. My test setup was as below,

  • 0 in reply to Hass

    Hello,

    Is it possible for you to send a picture of the modules with the shielding cap removed? 

    Best Regards,

    Samruddhi

  • 0 in reply to Samruddhi Jadhav

    Hello,

    Please see the module below,

    N is the variant with lower TX power and O is with the ~20dBm higher TX power.
    i have been swapping some components from the O variant to the N variant just to test if there is any difference (NOT the N7002 chip itself, but only the passive components). From the start both modules had all the components mounted (i.e NO missing component).

    Only missing components were around the 40MHz crystal caps on both O and N variants, but i guess they are left NOT Fitted by the manufacturers! 


    Thank you for your support and Please let me know if you have any further questions!

    Best Regards

    Hass

  • +1 in reply to Hass

    Hello,

    Have you tried swapping the chips? It would be great if you could provide some conducted measurements so that we would be able to review a bit better. It is also possible that there could be some random fault or that the issue is occurring due to the diplexer being broken. Do you have any more of these modules? 

    Best Regards,

    Samruddhi

  • 0 in reply to Samruddhi Jadhav

    Hello,

    no i have not swapped the chips and thats what i think could be the issue and asking for your help to verify!

    Samruddhi Jadhav said:
    It is also possible that there could be some random fault or that the issue is occurring due to the diplexer being broken. Do you have any more of these modules?

    I have tested on 4 different modules with the same results. i have a couple of spare modules and i am working on swapping different components on these just for verification but as of now i have not any results!

    kind regards

    Hass

  • 0 in reply to Hass

    Hello,

    Our hardware expert has suggested that the next step would be to swap the chips as well so that we get to know if it is the board or the chip which is causing the lower power. 

    Best Regards,

    Samruddhi

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