nRF5340 +3 dBm TX Power with ESB – VREQCTRL has no effect?

RE: nRF5340 +3 dBm TX Power with ESB – VREQCTRL has no effect?

Kenneth — Mon, 23 Jun 2025 06:39:36 GMT

Hi,

If you measure using RSSI radiated, it will likely not be able to distinguish 3dB difference, due to the other factors influence so much. Can you please try to measure conducted, and also connect a spectrum analyzer? If you have a PPK II you can even measure the current consumption, I expect you will see current increase for the transmission.

Kenneth

RE: nRF5340 +3 dBm TX Power with ESB – VREQCTRL has no effect?

H. Dekker — Thu, 19 Jun 2025 14:59:08 GMT

Hi Kenneth,

I understand that I can use esb_set_tx_power(3);. I can also use esb_set_tx_power(10) or even esb_set_tx_power(50);. But these values are ignored if they’re not supported, so in all cases the output power stays at 0 dBm.

I did test everything properly using Nordic SDK 3.0.2 and the ESB examples from the same SDK folder. I also added the RSSI function for testing. However, my RSSI values don’t change — the signal strength doesn’t improve.

RE: nRF5340 +3 dBm TX Power with ESB – VREQCTRL has no effect?

Kenneth — Thu, 19 Jun 2025 10:59:47 GMT

Hi,

Sorry, you can call esb_set_tx_power(3).

Kenneth

RE: nRF5340 +3 dBm TX Power with ESB – VREQCTRL has no effect?

H. Dekker — Wed, 18 Jun 2025 08:47:56 GMT

Hi Kenneth,

Sorry for my late reply, I was abroad for a while.

I tested the above, but ESB_TX_POWER_3DBM is not a valid value. I only have the options ESB_TX_POWER_0DBM or negative dBm values.

Herke

RE: nRF5340 +3 dBm TX Power with ESB – VREQCTRL has no effect?

Kenneth — Wed, 04 Jun 2025 15:24:58 GMT

Hi,

Just call esb_set_tx_power(ESB_TX_POWER_3DBM); The ESB library will ensure that the neccessary registers are set, for implementation check out update_radio_tx_power() in esb.c.

Kenneth