Add Loco deck TX power doc

docs/userguides/configuration/loco_tx_power.md

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+---
+title: Loco UWB TX power
+page_id: loco-tx-power-config
+---
+
+The transmit power used in the Ultra Wide Band radios in the Loco positioning system can be configured, both in the
+Crazyflie and the Nodes. Increasing the TX power increases the distance that the radio reaches.
+
+Note that the rules and regulations of different countries may restrict which settings that are allowed.
+
+## Configuring the Crazyflie
+
+The TX power of the Loco deck UWB radio is configured at build time through a [kbuild setting](/docs/development/kbuild/)
+. There are only two
+options, default and max power.
+
+Note that the Loco deck is only transmitting in TWR mode or when setting anchor positions. Setting full TX power for the
+Loco deck does not increase the space that a TDoA system covers.
+
+To change to full power:
+1. In a terminal, run `make meuconfig`
+2. Go to `Expansion deck configuration`
+3. Check the `Full TX power` option under the `Support the Loco positioning deck` section
+4. Save and exit
+
+Build and flash the firmware to the Crazyflie
+
+## Configuring the Node
+
+See the [node documentation](https://www.bitcraze.io/documentation/repository/lps-node-firmware/master/user-guides/configure-tx-power/) for details.