SSTV Encoder APK

This tool encodes digital images into SSTV audio signals, enabling amateur radio operators to transmit pictures via radio waves. It supports standard modes such as Martin M1, Martin M2, Scottie 1, Scottie 2, and PD, allowing users to produce a single, transmission-ready audio file. The encoder operates offline on mobile devices or dedicated hardware, ensuring reproducible results even without network access.

Conceptually, the system maps image luminance and color into line-based scan sequences defined by the selected mode. It inserts synchronization tones, porch intervals, and per-line pixel data, converting them to PCM samples at a chosen rate. The result preserves brightness and color cadence to maximize fidelity during transmission across different receivers and band conditions.

Key differentiators include mode-aware presets, deterministic outputs, and support for common audio formats (WAV and MP3). The tool is suited for training, field demonstrations, and experimentation with legacy SSTV formats, offering portability and reliable performance in constrained environments.

Core features cover mode selection, image dimension validation, optional contrast and brightness adjustments, and flexible output formats. The encoder targets users who need a compact, portable solution that maintains accurate timing and signal structure across modes.