PhosphorRTTY
Verktyg
Endast för iPhone
9,00 kr · Designad för 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.
Betyg och recensioner
Det visas ingen översikt eftersom den här appen inte har fått tillräckligt många betyg eller recensioner.
Utvecklaren Stuart Woolley har meddelat att appens integritetspraxis kan omfatta hantering av data enligt beskrivningen nedan. Mer information finns i utvecklarens integritetspolicy .
Data samlas inte in
Utvecklaren samlar inte in några data från den här appen.
Hjälpmedel
Utvecklaren har ännu inte uppgett vilka hjälpmedelsfunktioner som den här appen stöder. Läs mer
Information
- Storlek
- 2,7 MB
- Kategori
- Verktyg
- Kompatibilitet
Kräver iOS 26.2 eller senare.
- iPhone
Kräver iOS 26.2 eller senare. - Mac
Kräver macOS 26.2 eller senare och en Mac med Apple M1‑chip eller senare. - Apple Vision
Kräver visionOS 26.2 eller senare.
- Språk
- engelska
- Ålder
4+
- 4+
- Leverantör
Stuart Woolley
- Stuart Woolley har inte identifierat sig som en näringsidkare för den här appen. Om du är en konsument i det Europeiska ekonomiska samarbetsområdet (EES) gäller inte konsumenträttigheter för avtal mellan dig och leverantören.
- Copyright
- © 2026 Stuart Woolley
