TX Power issues

RE: TX Power issues

Samruddhi Jadhav — Fri, 05 Jun 2026 11:26:18 GMT

Hello,

Let us know if you have any further questions after hearing hearing back from them and we would be happy to help.

Best Regards,

Samruddhi

RE: TX Power issues

Hass — Thu, 04 Jun 2026 14:18:10 GMT

Thank you Samruddhi,

[quote userid="149179" url="~/f/nordic-q-a/128267/tx-power-issues/567416"]We thought that you were using two different modules, one from Fanstel and one from Jetreq[/quote]

Yes, that is True. and the one from Jetreq has the lower TX power.

[quote userid="149179" url="~/f/nordic-q-a/128267/tx-power-issues/567416"]a suggestion would be to contact Fanstel about this. [/quote]

I have reported this issue to Fanstel, but i have'nt got any feedback from the Fanstel. That is why i thought i might get some technical insights from the Nordic Semi team.

Best Regards

Hass

RE: TX Power issues

Samruddhi Jadhav — Thu, 04 Jun 2026 13:39:36 GMT

Hello,

We thought that you were using two different modules, one from Fanstel and one from Jetreq. From the picture you shared, both seem to be the same so a suggestion would be to contact Fanstel about this.

Best Regards,

Samruddhi

RE: TX Power issues

Hass — Thu, 04 Jun 2026 12:27:27 GMT

Hello,

now i have swapped all the components on the module without any change in TX power. so my guess is it is the chip itself. and it is almost impossible for me to swap the chip on the module without damaging the chip/module! (sorry not very good in de-soldering the QFNP modules).

is there any other thing we need to look into? firmware?

Thank You!

RE: TX Power issues

Samruddhi Jadhav — Thu, 04 Jun 2026 11:53:13 GMT

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

RE: TX Power issues

Hass — Thu, 04 Jun 2026 11:21:45 GMT

Hello,

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

[quote userid="149179" url="~/f/nordic-q-a/128267/tx-power-issues/567395"]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?[/quote]

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

RE: TX Power issues

Samruddhi Jadhav — Thu, 04 Jun 2026 09:55:17 GMT

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

RE: TX Power issues

Hass — Thu, 04 Jun 2026 07:40:44 GMT

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

RE: TX Power issues

Samruddhi Jadhav — Wed, 03 Jun 2026 12:43:05 GMT

Hello,

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

Best Regards,

Samruddhi

RE: TX Power issues

Hass — Wed, 03 Jun 2026 08:21:10 GMT

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,

RE: TX Power issues

Samruddhi Jadhav — Wed, 03 Jun 2026 07:55:58 GMT

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

RE: TX Power issues

Hass — Fri, 29 May 2026 11:06:31 GMT

Hello Samruddhi,

The images are from the radiated emission measurements. i have also tested with the E and H field probe to the NA and the result has been the same ~20dBm diff.

We have tested the radio modules from the both suppliers on the same board (PCB).

Best Regards

Hass

RE: TX Power issues

Samruddhi Jadhav — Fri, 29 May 2026 10:40:03 GMT

Hello,

I am looking into this issue internally with our team and have received some feedback from them. Can you please verify the output power using conducted or cabled measurements? The images which you have shared seem to be of radiated measurements. Note that if the two designs are different, then the behavior of the antennas will be different as well, also according to their orientation.

Best Regards,

Samruddhi

RE: TX Power issues

Hass — Fri, 29 May 2026 07:06:39 GMT

[quote userid="149179" url="~/f/nordic-q-a/128267/tx-power-issues/567091"]s it possible for you to share your measurements? We can then review exactly where the difference in measured tx power is occurring and what it is. [/quote]

Hello, Thank you for taking the time to looking into this issue! below are the measurements i have done in an EMC chamber using NA. The results below are when i set the WiFi TX power to 18dBm.

WiFi Radio module (varient-1)

WiFi Radio module (varient-2)

Varient-1 and Varient-2 are the same WiFi module (WM02F WiFi module with nRF7002 SoC). only bought from different suppliers. Almost 20dBm difference with the same TX power!

Furthermore, with controlling the TX power i mean, i can set the TX power of the Radio module. for exp i can set the radio module should transmit with 10dBm, 12dBm, 14dBm and so on.

Thank you!

RE: TX Power issues

Samruddhi Jadhav — Fri, 29 May 2026 06:55:11 GMT

Hello,

Is it possible for you to share your measurements? We can then review exactly where the difference in measured tx power is occurring and what it is.

[quote user="Hass"]Furthermore, i can control the radio TX power (0-20dBm) with modbus communication.[/quote]

Can you please clarify what you mean by controlling the output power via modbus here?

Best Regards,

Samruddhi

RE: TX Power issues

Hass — Thu, 28 May 2026 06:15:50 GMT

i am using the BT40F as a BLE and main processor on the board. The BT40F and WM02F are certified while being used in co-location. i am using network analyzer with an E/H filed measurement probes to compare the TX power from the WIFi module. Other than that i have used the EMC chamber to measure the WiFI TX power from the both (variants) radio modules. The firmware part is from the Nordic Semi development with recommended settings. (sorry i have a very little understanding of the firmware part of this since i have been developing only the hardware), that is why i was wondering if there are any special setting to control or can affect the TX power from the WM02F.

Furthermore, i can control the radio TX power (0-20dBm) with modbus communication.

Thank you in advance for your support!

RE: TX Power issues

Szabolcs — Wed, 27 May 2026 10:45:47 GMT

Hi,

could you please clarify the issue? What is the other module you are using? How are you measuring the TX power, what is your measurement setup? What firmware and settings are you using for measurement?