OOK Signal Decoder

Decode raw OOK (On-Off Keying) signals via rtl_433 flex decoder. Captures frames with configurable pulse timing and displays raw bits, hex, and attempted ASCII — useful for unknown ISM-band protocols.

Frequency

Frequency (MHz)

Presets (right-click to remove)

SDR Settings

Gain (dB)

PPM Correction

Modulation

Short pulse = 0, long pulse = 1. Most common for ISM OOK.

Pulse Timing

Pulse widths in microseconds for the flex decoder.

Short (μs)

Long (μs)

Gap/Reset (μs)

Gap limit (μs)

Tolerance (μs)

Min bits

Quick presets (short/long μs)

Options

Deduplicate frames

Suppress consecutive frames with identical hex content. Useful when a transmitter repeats the same packet multiple times.

Standby 0 frames

Uses rtl_433 with a custom flex decoder. Requires rtl_433 installed. Works on any OOK/ASK signal in the SDR's frequency range.

Active Command