SWLtools

An iOS app that turns an iPhone or iPad into a real-time radio signal analysis tool for shortwave listeners and ham radio operators. It shows live spectrum and waterfall displays and decodes digital modes (CW, RTTY, SITOR-B, WEFAX, ACARS) directly from the connected receiver’s audio.

I designed and built the app independently, from signal processing to UI and App Store publishing. Key challenges included real-time DSP on mobile hardware, low power consumption for portable use, and support for multiple audio sources (USB, built-in mic).

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