SimpleSSTV vs VibeSDR Jr

SimpleSSTV is a native iOS app for encoding, decoding, and live-transmitting slow-scan television (SSTV) signals — the method ham radio operators use to share images over audio frequencies. Slow-scan television converts images to audio tones. Each pixel's brightness becomes a specific frequency between 1500-2300 Hz. Sync pulses at 1200 Hz mark line boundaries. The result is an audio signal you can transmit over any voice-capable radio, or record for later playback. SSTV has been used by amateur radio operators since the 1950s. It's still actively used today on HF bands, VHF repeaters, and for receiving images from the International Space Station. ENCODING (Image → Audio) • Load any image from your photo library, camera, or Files • Automatic resize and crop to SSTV resolution • 21 supported modes covering all major SSTV formats • Real-time encoding with progress visualization • Play audio directly through speakers for VOX-triggered transmission • Export to WAV or M4A for later use • Optional FSK ID and CW ID (Morse code) callsign transmission • Test pattern generator for signal testing LIVE CAMERA MODE • Real-time camera feed with front/back camera switching • Three trigger modes: Continuous, Motion-triggered, or Periodic interval • Adjustable motion sensitivity with adaptive background model • Captures and encodes directly from camera to audio • Perfect for portable operation, field day, and unattended stations DECODING (Audio → Image) • Load WAV, M4A, or MP3 audio files containing SSTV signals • Live microphone capture for real-time SSTV reception • Automatic mode detection via VIS code identification • Progressive line-by-line image preview during decode • FSK callsign detection from received signals • Precision audio trimming with dual-view waveform editor • Re-decode saved images with different mode, sync offset, or slant correction • Handles real-world signal imperfections: timing drift, noise, sample rate variations • Optional decode watermark stamps mode, timestamp, and callsign on received images • Waterfall spectrogram display shows signal frequency over time SUPPORTED MODES (21 total) • Martin M1, M2, M3, M4 • Scottie S1, S2, S3, S4, DX, DX2 • Robot 36, Robot 72, Robot BW8 • PD50, PD90, PD120, PD160, PD180, PD240, PD290 • Wraase SC2-180 ISS SSTV EVENTS • Get notified when the International Space Station transmits SSTV images • Automatic alerts before and during events, with frequency, mode, and callsign info • Info card on the decode tab with event details and countdown FAQ & SETUP TIPS • Practical advice on audio setup and USB adapters • Decode quality troubleshooting • Quick reference for all 21 SSTV modes IMAGE LIBRARY • Automatic saving of encoded and decoded images • Grid view with full preview, metadata, and sharing • Re-decode any saved image with different settings • Filter by encoded or decoded 10 LANGUAGES Available in Arabic, Chinese (Simplified), Dutch, English, French, German, Polish, Portuguese (BR), Spanish, and Turkish — with full right-to-left support. PRIVACY No accounts, no analytics, no tracking. Your images and audio stay on your device. Free to encode and decode. Optional one-time Pro purchase unlocks watermark customization and Listening Station Mode. We do not use, sell or share your data for advertising or marketing purposes. Be aware: Encoded images are audio signals — anyone receiving the audio can decode them! REQUIREMENTS • iOS 17.6 or later • Camera access for live mode • Microphone access for live decode Built by a ham radio operator for ham radio operators. 73!

VibeSDR Jr is a complete software-defined radio receiver that runs on your Apple Watch. Not a remote control for a phone in your pocket — the watch makes its own connection, does its own decoding and plays its own audio. Leave the handset at home. Turn the Digital Crown to tune. The spectrum and waterfall run live on the wrist, in colour, at a frame rate you can actually read a band with. Press and hold for the menu, and everything else is a tap away. WHAT IT RECEIVES Jr is a client, so it needs a receiver to listen to — either one of your own on your network, or one of the thousands of public ones already out there. It speaks VibeServer, OpenWebRX, KiwiSDR and FM-DX Webserver, and it ships with a directory of public servers, so there is something to listen to within seconds of installing. VibeServer is your own receiver. It is built into the VibeSDR phone app and available free for macOS — plug in an RTL-SDR, an Airspy HF+ or an SDRplay RSP and it is yours. MODES AND DECODERS USB, LSB, AM, SAM, FM, NFM and wide FM in stereo, plus CW upper and lower. DAB, and an ADS-B view that plots the aircraft talking overhead. ON THE WRIST Bookmarks, synced with the VibeSDR phone app through iCloud. A band plan, so you know what you are looking at. Bandwidth, squelch, gain and the receiver's own hardware controls — including the LNA, IF gain and notches an SDRplay RSP actually has, rather than a dongle's single slider pretending to be them. Background audio, so it keeps playing when you drop your wrist. And a link meter that tells you the truth about the connection. VibeSDR Jr is open source under the GPLv3. The engine underneath it, VibeDSP, is our own — the same one that runs the phone app, so a waterfall you set up in one turns up looking the same on the other. Requires a Wi-Fi or cellular connection, and a receiver to connect to.