Pocket25

## **Pocket25**

**Professional P25 radio monitoring on Android**

Pocket25 turns your Android phone into a powerful P25 digital trunking scanner. Using an inexpensive RTL-SDR dongle, it brings desktop-class digital radio decoding to a portable, mobile setup. It’s built on the DSD-Neo engine to provide accurate, reliable decoding of APCO Project 25 systems.

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## **Why Pocket25**

Dedicated digital scanners are expensive and bulky. Pocket25 lets you do the same job with a phone and a low-cost SDR. It’s useful for radio hobbyists, journalists, and professionals who need to monitor public safety and utility radio systems.

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## **P25 Support**

Pocket25 is designed specifically for P25 systems.

* **Phase 1** – FDMA (C4FM) decoding (Confirmed Working)
* **Phase 2** – TDMA (QPSK) decoding (Testing in Progress)
* **True trunk tracking** – follows active conversations across control channels so replies aren’t missed

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## **Automatic System Setup**

Pocket25 integrates with the RadioReference database.

* Search for your city or county
* Select a system
* Import and start listening

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## **Live Signal Information**

Pocket25 shows the data inside the signal while you listen.

* Talkgroup IDs, Radio IDs, and NAC codes
* WACN, System ID, Site ID, and RFSS
* Encryption and emergency status flags

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## **Controls and Logging**

* Whitelists and blacklists for talkgroups
* Call history and activity logs
* Manual tuning for conventional (non-trunked) channels

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## **Hardware Support**

* Works with RTL-SDR USB dongles using a simple OTG cable
* No root required
* Built-in drivers for low-latency operation
* Can connect to remote `rtl_tcp` servers over a network

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## **Decoder Engine**

Pocket25 uses DSD-Neo with the mbelib vocoder for accurate, high-quality digital voice decoding.

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## **Requirements**

* Android 8.0 or newer
* RTL-SDR V3, V4, or compatible RTL2832U-based dongle
* USB OTG cable

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**Legal note:** Pocket25 is for authorized radio monitoring only. Follow all local and national laws regarding radio interception and encryption.