Tech-dat/tech-dat.md
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- [[rf-link-dat]]
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-- [[ELRS-dat]]
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+- [[ELRS-dat]] - [[CRSF-dat]] - [[radiomaster-dat]] - [[radiomaster-pocket-dat]]
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- [[M2M-dat]] - [[SIMCOM-dat]] - [[quectel-dat]] - [[A7670-dat]]
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app-dat/RC-apps-dat/RC-supplier-dat/radiomaster-dat/radiomaster-pocket-dat/radiomaster-pocket-dat.md
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![](2026-06-25-23-58-56.png)
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+## Internal RF vs. External RF Settings
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+On the RadioMaster Pocket, these settings tell the radio where to send the control signals depending on whether you are using the built-in transmission chip or an add-on module.
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+
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+---
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+
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+### 1. Internal RF (Built-In Module)
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+This controls the transmitter chip that is physically soldered inside the RadioMaster Pocket's body.
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+
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+* **What it powers:** The built-in **ExpressLRS (ELRS) 2.4GHz** module (or CC2500 module, depending on your version).
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+* **When to use it:** Turn this **ON** (set to `Mode: CRSF` for ELRS) when communicating directly with your drones or robots using the radio's native built-in antenna.
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+* **Power saving:** Turn it **OFF** if you aren't using it to save battery life.
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+
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+---
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+
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+### 2. External RF (Expansion Slot Module)
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+This controls the pinned expansion bay located on the back of the radio handset.
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+
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+* **What it powers:** Removable external hardware modules that you snap into the back slot (such as a TBS Crossfire Nano TX, a 915MHz ELRS module, or a multi-protocol module).
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+* **When to use it:** Turn this **ON** (set to `Mode: CRSF` for Crossfire/External ELRS) only when you have physically plugged a module into the back bay.
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+* **Power saving:** Keep this **OFF** unless a module is plugged in, as it routes live battery power directly to those back pins.
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+---
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+
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+### Summary Checklist:
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+| If you are using... | Internal RF | External RF |
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+| :----------------------------------------------- | :---------- | :---------- |
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+| The radio's built-in ELRS system | **CRSF** | **OFF** |
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+| A module plugged into the back (e.g., Crossfire) | **OFF** | **CRSF** |
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+| A PC simulator via USB cable | **OFF** | **OFF** |
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+
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