Change of TX_Power limitation

[harshg]

Hello

I would like to change the Tx_Power using softdevice. 

The sd_ble_gap_tx_power_set command shows me the supported tx_power values as -40dBm, -20dBm, -16dBm, -12dBm, -8dBm, -4dBm, 0dBm, +3dBm and +4dBm.

My question is 

If I want an intermediate power level of -30dBm or anything in between -20dBm and -40dBm, why is there a limitation. Is it hardware related? or there is a way to achieve it

Thank you

[Håkon Alseth]

Hi,

 

If I want an intermediate power level of -30dBm or anything in between -20dBm and -40dBm, why is there a limitation. Is it hardware related?

This is a restriction of the hardware itself: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/radio.html?cp=4_2_0_22_13_9#register.TXPOWER

You can set the register to -30, but the actual output power will be -40 dBm.

 

Kind regards,

Håkon 

[harshg]

Is there any other Nordic chip that comes with tunable antenna? 

[Håkon Alseth]

The antenna must be designed in by you, there's no on-board antenna.

Do you mean output power setting? All nRF5-devices have a option to set the output power.

 

Kind regards,

Håkon

[harshg]

Yes I meant o/p power setting. Is there any other nordic chip that has more options of tx_power between -20dBm and -40dBm.

Also what is the best procedure to calibrate the nrf chip if I have to? 

thank  you

[Håkon Alseth]

harshg said:

Also what is the best procedure to calibrate the nrf chip if I have to? 

no calibration needed. 

 

harshg said:

Yes I meant o/p power setting. Is there any other nordic chip that has more options of tx_power between -20dBm and -40dBm.

 If you require bluetooth LE capabilities, the nRF51-series has -30 dBm option.

 

Best regards,

Håkon