Setting the max WiFi Tx power

[joanou]

Hi,

We have a requirement to not exceed 63 mW of WiFi Tx power at any time for any band (2.4 or 5 GHz). There is a statement about changing Tx power is not supported. Can it be limited by changing nRF Connect SDK v2.6.2 or 2.7.0 code or configuration?

docs.nordicsemi.com/.../transmission_power.html

I see the parameters: CONFIG_NRF700X_BAND*, etc, but there is no sufficiently detailed explanation.

Thanks, Steve

[dejans]

Hi,

Can you provide more information about your application? Is it Matter application? Is it based on any of our samples?

Which board do you use?

Best regards,
Dejan

[joanou]

No. It is not a Matter application. It uses CoAP client to PUT and GET from a CoAP server for IOT. It uses credentials to connect to an access point.

I do not see how this is related to limiting the Tx power. What can be done with these CONFIG_NRF700X_BAND* config items?

Thanks, Steve

[dejans]

Hi,

If you look at the nrf7002 electrical specification, maximum transmit power is provided for 2 different packages - WLCSP and QFN. In your case, 63 mW is 18 dBm. Depending on the package, you would need to change only those values that exceed 18 dBm and that would be only transmit power parameter Maximum transmit power 2.4 GHz (DSSS/CCK) for QFN package. You could set it to for example 15 dBm in the nrf70_tx_power_ceiling_node. You would also need to take into account antenna gain, i.e. if it is 3 dBi, max Tx power must be limited to 15 dBm and the radiated power would be 15+3=18 dBm.

Best regards,
Dejan