Signals lab

Small instruments for curious minds. Every calculation runs in your browser, with no account or paid API.

Daylight & gray line

Follow the boundary between day and night using a locally calculated solar position. This is a geometry model, not a propagation forecast.

Convert coordinates and Maidenhead locators, then calculate a great-circle distance and initial true bearing between grid-square centers.

Encode and decode International Morse code, or listen to a short practice sequence generated on your device.

Explore ideal free-space wavelength from frequency. These are reference dimensions, not corrected antenna cutting lengths.

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