FlipperTX transmits signals from Flipper Zero .sub capture files directly from the PortaPack. It reads the file's encoded protocol timing data and replays it over the air at the configured frequency using the modulation preset defined in the file itself.

SD Card Setup

Place .sub files in the SUBGHZ/ directory at the root of the SD card. The Browse button opens a file selector starting in this directory, filtered to .sub files.

Supported File Formats

FlipperTX only supports a subset of the Flipper Zero .sub file format:

Protocols:

Protocol	Support
RAW	✅ Supported
BinRAW	✅ Supported
All others	❌ Not supported

Presets (modulation):

Preset	Modulation	Support
OOK	On-Off Keying	✅ Supported
2FSK	2-level FSK	✅ Supported
Custom or unknown	—	❌ Not supported

If the file uses an unsupported protocol or preset, the filename field shows an error message and transmission is blocked:

• File: err, bad file — file could not be parsed
• File: err, not supp. proto — protocol not RAW or BinRAW
• File: err, not supp. preset — preset not OOK or 2FSK

Controls

• Frequency: Transmit frequency. Defaults to 433.920 MHz. Must be set manually to match the frequency in the .sub file — the app does not read frequency from file metadata automatically.
• Gain / AMP: TX gain and RF amplifier toggle.
• Browse: Opens the file selector in SUBGHZ/. After a valid file is selected, the full path is shown in the filename field.
• Start / Stop: Begins or aborts transmission. The file is transmitted once and stops automatically at end of file. There is no loop mode.

Transmission Parameters

These values are fixed and cannot be changed from the UI:

Parameter	Value
Sample rate	2,280,000 Hz
Bandwidth	1,750,000 Hz
FM deviation (2FSK only)	60,000 Hz

Settings Persistence

Settings are saved to tx_flippertx.ini.