FRDM-KW41Z external antena

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FRDM-KW41Z external antena

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evgenyerlihman
Contributor IV

Hello,

I am evaluating the FRDM-KW41Z board, and i cant find anything about any actions needed for using the SMA instead of the F antena. Can i assume that no actions needed, just attach external antena and it would work?

The second question is, in-order to increase TX power, i am changing the mConnectionDefaultTxPower_c and mAdvertisingDefaultTxPower_c to be 31 instead of 20. Would this provide me with the maximal TX power level possible?

Thanks,

Evgeny

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gerardo_rodriguez
NXP Employee
NXP Employee

Hi Evgeny Erlihman,

To use the SMA you need to rotate the 10 pF capacitor in C8 to the location of C7 as indicated in section 3.1. RF circuit in the FRDM-KW41Z Freedom Development Board User's Guide.

For your second question, you are correct. You can change the value of the mAdvertisingDefaultTxPower_c and mConnectionDefaultTxPower_c to 31 to achieve the maximum TX power level. 

These macros are used inside the Controller_TaskInit() function to set the power level.

/* Set Default Tx Power Level */
 Controller_SetTxPowerLevel(mAdvertisingDefaultTxPower_c, gAdvTxChannel_c);
 Controller_SetTxPowerLevel(mConnectionDefaultTxPower_c, gConnTxChannel_c);

Regards,
Gerardo

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