Open Source / Browser-Based

Mergen Scope - Free Online RF and Signal File Viewer

Open DAT files online in a free browser-based viewer with markers, trace math, RF analysis tools, and multi-pane comparison.

Open Viewer

Load Demo Open on GitHub Live

Markers Trace Ops Multi-pane RF Analysis

Features

Multi-trace

Load and overlay multiple measurement files for direct comparison.

Markers

Place markers, search for peaks and minima, create delta markers between points.

Trace Ops

Create derived traces with offset, scale, smoothing, and A/B trace math.

Multi-pane

Compare traces in stacked panes with shared X navigation and independent Y scaling.

RF Analysis

Run Noise PSD, IP3, peak tables, range statistics, threshold crossings, and bandwidth helpers.

No Online Dependencies

All libraries are vendored locally. Works with direct file-open and GitHub Pages, with no CDN runtime calls.

Supported Formats

Format Notes

R&S .dat Rohde & Schwarz spectrum analyzer exports, tested primary target

Amplitude-only .dat Frequency axis reconstructed from Start/Stop metadata

Other formats Not implemented yet. Broader format support, including Touchstone, is planned for later phases.

Technology

Vanilla JavaScript (ES6+) React 18, vendored Recharts, vendored Local helper modules GitHub Pages GPL-3.0

Why I Built This

I'm an electrical engineer, not a web developer. I wanted a simple way to inspect spectrum analyzer exports and other waveform files directly in the browser, but I couldn't find a tool that was lightweight, practical, and easy to use. So I built this.

At the moment, it has only been tested with Rohde & Schwarz FSVA3044 .dat files, but the goal is to support more instrument export formats over time, with no installation required. If you find bugs, have suggestions, or want to contribute, feel free to open an issue.