NRF_RADIO_MODE_BLE_LR125KBIT

[masa]

Hello Nordic,

I’m using ncs\v3.1.0\nrf\samples\peripheral\radio_test` to test the nRF54L15 with PHY set to `NRF_RADIO_MODE_BLE_LR125KBIT`.
However, the RF spectrum measurement shows a duty cycle of 0%.
Could this be related to the NCSDK-30519 issue?
Is there any known workaround or solution?

[curtiskernan]

Yes, this is likely related to NCSDK-30519. In NCS v3.1.0, the radio_test sample on nRF54L15 has a known issue with NRF_RADIO_MODE_BLE_LR125KBIT, where the transmitted signal may appear as 0% duty cycle or not be detected correctly by RF instruments.

Workaround:

Use BLE_1MBIT or BLE_2MBIT PHY for validation, or
Upgrade to a newer NCS release where the issue is fixed/improved.

Also verify using packet RX between two boards, since some spectrum analyzers do not properly display BLE coded PHY occupancy.