PhosphorRTTY
Utilitaires
Uniquement pour iPhone
0,99 € · Conçue pour iPhone
iPhone
PhosphorRTTY decodes Radio Teletype (RTTY) signals in real time using your iPhone's microphone. Hold your phone near a shortwave radio tuned to an RTTY signal and watch the text appear on screen, character by character, on an authentic phosphor CRT display.
No internet connection required. No external hardware. No account. Just your iPhone and a radio.
WHAT IT DECODES
RTTY is the oldest digital mode in amateur radio — two audio tones representing mark and space, encoding text via the 5-bit ITA2 (Baudot) alphabet or 7-bit ASCII. PhosphorRTTY handles all standard configurations:
Baud rates: 45.45, 50, 75, 100 Bd (auto-detected or manual)
Shifts: 85, 170, 450, 850 Hz (auto-detected or manual)
ITA2 (Baudot) and ASCII modes
USB and LSB conventions
AUTOMATIC SIGNAL DETECTION
The app automatically finds and locks onto RTTY signals:
AFC (Automatic Frequency Control) acquires and tracks drifting signals
Auto-baud detection identifies the transmission speed
Auto-shift detection determines the frequency separation
Squelch suppresses noise when no signal is present
Or disable any of these and tune manually for full control.
FOUR TABS
DECODE — The main teleprinter display. Decoded text appears character by character with an authentic mechanical delay. Status bar shows baud rate, shift, mark/space frequencies, and signal lock state. Clear, pause, and session controls.
SIGNAL — Live signal analysis. FFT spectrum display (0–4 kHz), scrolling waterfall, mark/space tone indicators, bit period histogram with baud rate markers, and a paper punch tape visualisation of the decoded data stream.
LOG — Session history. Every decode session is saved with timestamp, duration, character count, and the full decoded text. Copy, share, or delete individual sessions.
CONFIG — All parameters. Audio input gain, decode mode (auto/manual for baud, frequency, and shift), display theme, font size, bell character handling, and RYRY sequence display options.
THE DISPLAY
Two authentic phosphor CRT themes:
Amber (classic teleprinter terminal)
Green (military/commercial terminal)
Both feature horizontal scanlines, edge vignette, and phosphor glow effects.
Monospaced font throughout. RYRY test sequences can be dimmed or hidden to keep the display clean.
DSP ENGINE
The signal processing is done entirely on-device using a per-sample I/Q quadrature demodulation pipeline:
Biquad low-pass filtered I/Q channels for each tone
W7AY Automatic Threshold Correction for bit decisions
Digital Phase-Locked Loop (DPLL) with per-transition phase correction for timing recovery
512-point FFT for frequency analysis and AFC
Asymmetric envelope detection for robust tone tracking through fading
Tested against real over-the-air recordings from 20m and 40m amateur bands. Under 1% error rate on clean signals, 4–5% on moderate HF conditions with fixed tuning.
WHERE TO FIND RTTY
Amateur radio: 14.080–14.099 MHz (20m band), 7.080–7.100 MHz (40m band), 21.080–21.100 MHz (15m band). RTTY contests run throughout the year — during a contest, these frequencies are packed with signals.
Maritime and commercial RTTY transmissions can be found across the HF spectrum. A shortwave receiver or SDR with audio output is all you need.
REQUIREMENTS
iPhone with microphone
iOS 17 or later
A radio receiver tuned to an RTTY signal (shortwave radio, SDR, or WebSDR audio played through a speaker)
No in-app purchases. No subscriptions. No tracking. No network access.
Notes et avis
Cette app n’a pas reçu suffisamment de notes ou d’avis pour en proposer un aperçu.
Le développeur Stuart Woolley a indiqué que les pratiques de l’app en matière de confidentialité peuvent inclure le traitement des données tel que décrit ci‑dessous. Pour en savoir plus, consultez la politique de confidentialité du développeur .
Données non collectées
Le développeur ne collecte aucune donnée avec cette app.
Accessibilité
Le développeur n’a pas encore indiqué quelles fonctionnalités d’accessibilité sont prises en charge par cette app. En savoir plus
Informations
- Taille
- 2,7 Mo
- Catégorie
- Utilitaires
- Compatibilité
Nécessite iOS 26.2 ou version ultérieure.
- iPhone
Nécessite iOS 26.2 ou version ultérieure. - Mac
Nécessite macOS 26.2 ou une version ultérieure et un Mac doté d’une puce Apple M1 ou une version ultérieure. - Apple Vision
Nécessite visionOS 26.2 ou version ultérieure.
- Langues
- Anglais
- Âge
4+
- 4+
- Fournisseur
Stuart Woolley
- Le fournisseur Stuart Woolley ne s’est pas identifié comme commerçant de cette app. Si vous achetez des biens et services dans l’Espace économique européen, le droit des consommateurs ne s’applique pas aux contrats entre vous et le fournisseur.
- Copyright
- © 2026 Stuart Woolley
