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Yes—an experimental community app can send APRS/AX.25-style packets using the Flipper Zero’s built-in CC1101 Sub-GHz radio. You do not need an external transmitter for the basic experiment, but you do need a microSD card for Sub-GHz features. The project is transmit-focused, and whether a receiver decodes its signal is not guaranteed.
What the Flipper Zero APRS app does
Richard YO3GND’s flipper-zero-aprs-tx project is described as an experimental APRS/AX.25 transmitter. It can send messages, status packets, bulletins, and fixed-position packets. The project README lists 1200- and 9600-baud modes, repeat transmission, a small destination callbook, and settings that can affect how receivers decode the signal.
The author frames the project as an experiment in whether the Flipper can transmit something close enough to APRS for a patient receiver to decode. That is a useful description of its scope: it demonstrates packet transmission, not a guarantee of compatibility with every APRS receiver or gateway.
Why no separate transmitter is required
The Flipper Zero includes a CC1101-based Sub-GHz transceiver. Flipper Devices’ documentation lists tuning bands of 300–348 MHz, 387–464 MHz, and 779–928 MHz. The 435 MHz area discussed as a practical starting point for the project falls within the documented 387–464 MHz band; Hackaday also notes that this coverage reaches much of the 70 cm amateur band.
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The official documentation gives a maximum range of 50 meters for the built-in Sub-GHz hardware. That is a stated device specification, not a measured APRS gateway range or a promise that a packet will travel that far. Antenna, orientation, frequency, receiver setup, and local conditions matter, and the available sources do not report an independent range test or packet-success rate.
What you need to try it
- A Flipper Zero with its built-in radio; an external CC1101 module is optional, not required for the basic setup.
- A microSD card. Flipper’s documentation says the Sub-GHz app requires one because its Sub-GHz databases are stored on the card.
- The
flipper-zero-aprs-txapp, installed from the Flipper App Catalog or sideloaded as a.faprelease, as described in the project README. - A receiver or decoder to check whether the transmitted packets can be decoded. The project author mentions Dire Wolf and qtmm as software decoder options, while noting that some hardware decoders may not work reliably.
How to approach the experiment
- Install the app. Use the Flipper App Catalog or sideload the project’s
.faprelease. The README supports selecting the internal or an external CC1101 radio; choose the internal radio to test the no-extra-transmitter setup. - Set up a receiver before transmitting. Choose a decoder and receiver arrangement that can monitor the permitted frequency and test whether it recognizes the packet. Do not assume that a successful transmission on the Flipper’s display means a receiver decoded it.
- Choose the project’s packet and speed settings. The README lists messages, status, bulletins, fixed-position packets, and 1200- or 9600-baud operation. Decoding can vary with the receiver and RF settings, so a failed decode does not by itself establish that the Flipper did not transmit.
- Transmit only where you are authorized. Before sending anything over the air, check the frequency and operating rules for your location. Flipper’s official CLI documentation also notes that some frequencies may be unavailable in a user’s region; its documented Sub-GHz transmit operations include
subghz txandsubghz tx_from_file, but those CLI commands are not a substitute for the APRS app’s own setup.
Why packet decoding can be inconsistent
The project README characterizes its signal as unconventional and describes a rough FSK approach that relies heavily on the receiver’s discriminator and filters. A receiver’s deviation handling, filtering, timing, antenna, and orientation can all affect the result. The project supports experimentation with RF settings, but it does not claim universal APRS compatibility; some software decoders may work where particular hardware decoders do not.
Rank #2
- All-in-One Expansion Module – Unlock the full potential of your Flipper Zero with an integrated OLED display, Wi-Fi, 433MHz RF, and GPS functionality. Designed for developers, tinkerers, and security enthusiasts.
- Complete Accessory Set – Includes everything you need: external module board, USB-C cable, silicone protective case, soft PU pouch, and a durable hard carry case for storage and transport.
- Premium Protection & Portability – The sturdy hard case keeps your gear safe during travel, while the soft pouch and silicone case provide additional protection against scratches and dust.
- Developer-Friendly Design – Ideal for experimentation, firmware testing, and open-source development. This module supports creative use and custom projects (for lawful and educational use only).
- Plug-and-Play Compatibility – Fully compatible with the standard Flipper Zero interface. Connect easily via USB-C for quick setup, power delivery, and firmware updates.
This makes the Flipper a proof-of-concept transmitter rather than a dependable replacement for a purpose-built APRS transceiver. The project information establishes packet-transmit features, but not equivalent receiving capability, transmit reliability, power flexibility, or network coverage. An external CC1101 is an optional project-supported path for experimentation, not a requirement for the basic demonstration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the rules before using an APRS frequency
Being able to tune to a frequency does not make transmission there legal. The project README says national licensing restrictions apply when transmitting on the actual APRS network, and Flipper’s documentation limits transmission to frequencies permitted in the user’s region. Requirements vary by jurisdiction; verify your amateur-radio licence, band plan, allowed frequency, and power limit locally before attempting a live-network transmission. No single country’s rules can be inferred for readers generally.
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Rank #3
- Package Inclued: 1* Soft Silicone Case for Flipper Zero; 3* Screen Protectors for Flipper zero; 1* EVA Carrying Case; 1*Hand Strap; 1* Carabiner;
- 360° front-and-back design provides full-body rugged protection for your flipper zero, even the most difficult corners to protect - the protection part for the iButton has also been well designed with soft silicone
- Our protective case perfectly compatible with the video game module for Flipper Zero, ensuring silky-smooth operation and perfect protection for your device when using.
- Precise cutouts and perfect fits allows easy access to all buttons controls and ports without having to remove the case.
- The Flipper Zero Device is not included.
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