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doc: nrf5340_audio: note about +20 dBm limitation #12507

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Oct 5, 2023
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doc: nrf5340_audio: note about +20 dBm limitation #12507

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4 changes: 4 additions & 0 deletions applications/nrf5340_audio/README.rst
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Expand Up @@ -405,6 +405,10 @@ You can add support for the nRF21540 front-end module (FEM) to this application

To set the TX power output, use the :ref:`CONFIG_NRF_21540_MAIN_TX_POWER <config_nrf53_audio_app_options>` and :ref:`CONFIG_NRF_21540_PRI_ADV_TX_POWER <config_nrf53_audio_app_options>` Kconfig options.

.. note::
When you build the nRF5340 Audio application with the nRF21540 FEM support, the :ref:`lib_bt_ll_acs_nrf53_readme` does not support the +20 dBm setting.
This is because of a power class restriction in the controller's QDID.

See :ref:`ug_radio_fem` for more information about FEM in the |NCS|.

.. _nrf53_audio_app_building_script:
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3 changes: 3 additions & 0 deletions doc/nrf/libraries/bin/bt_ll_acs_nrf53/index.rst
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Expand Up @@ -69,6 +69,9 @@ The controller is marked as :ref:`experimental <software_maturity>`.
This controller and the LE Audio Controller Subsystem for nRF5340 it includes has been tested and works in configurations used by the :ref:`nrf53_audio_app` application (for example, 2 concurrent CIS, or BIS).
No other configurations than the ones used in the referenced application have been tested or documented for this library.

When you :ref:`build the nRF5340 Audio application with the nRF21540 FEM support <nrf53_audio_app_adding_FEM_support>`, the LE Audio controller for nRF5340 does not support the +20 dBm setting.
This is because of a power class restriction in the controller's QDID.

Dependencies
************

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16 changes: 9 additions & 7 deletions doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst
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Expand Up @@ -38,12 +38,7 @@ IDE and tool support
Application development
=======================

|no_changes_yet_note|

RF Front-End Modules
--------------------

* Updated the name of the ``nrf21540_ek`` shield to ``nrf21540ek``.
This section provides detailed lists of changes to overarching SDK systems and components.

Build system
------------
Expand All @@ -54,6 +49,11 @@ Build system
* The |NCS| name and version is now displayed instead of the Zephyr version as the default boot banner when applications boot.
This can be customized in user applications.

nRF Front-End Modules
---------------------

* Updated the name of the ``nrf21540_ek`` shield to ``nrf21540ek``.

Working with nRF91 Series
=========================

Expand Down Expand Up @@ -620,7 +620,9 @@ Debug libraries
Binary libraries
----------------

|no_changes_yet_note|
* :ref:`lib_bt_ll_acs_nrf53_readme` library:

* Added a limitation about the lack of support for the +20 dBm setting when :ref:`building the nRF5340 Audio application with the nRF21540 FEM support <nrf53_audio_app_adding_FEM_support>`.

Bluetooth libraries and services
--------------------------------
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