Signal by Rethink SparkBeta

Analyse your IQ captures.

Spectrum, measurements, demodulation, and bit inspection.

StartSee the app
Full-file spectrogram, recording opened in Signal.
Full-file spectrogram, recording opened in Signal.

Open, explore.

An IQ recording is the starting point: one signal, several signals, noise, carriers - or something you cannot name yet.

Browse the spectrogram, zoom in, select a zone in time and frequency, name it, annotate it. No need to know what it is to start.

A selected zone, ready to analyze.
A selected zone, ready to analyze.

Measure before interpreting.

SNR, noise floor, carrier frequency, bandwidth, power, envelope, instantaneous frequency - measured on the selected zone.

These values describe what is observed. On their own, they are not an identification.

One zone, four readings: spectrum, envelope, instantaneous frequency, constellation.
One zone, four readings: spectrum, envelope, instantaneous frequency, constellation.

Demodulating is transforming.

Choose the method, set its parameters, examine the result.

A demodulation is a transformation, not an identification. It does not say which protocol is present.

Trying a 2-FSK demodulation on a zone.
Trying a 2-FSK demodulation on a zone.

Inspect the bitstream.

Examine alignment, repetitions, patterns, entropy, hexadecimal, and ASCII.

Look for structure before looking for the protocol.

The demodulation result, inspected bit by bit.
The demodulation result, inspected bit by bit.

Who is it for?

SDR
Explore and characterize IQ captures.
Radio & DSP
Measure and compare signals.
Reverse engineering
Go from signal to bitstream.
Research & teaching
Work from reproducible measurements and observations.

Open a capture.

Start