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◀ ALL APPS / SHORT WAVE UTILITIES

PhosphorHertz

HF PROPAGATION
Real-time HF radio propagation monitor. NOAA space weather data translated into band-by-band conditions.
HF propagation app for iPhone. Real-time shortwave band conditions from NOAA space weather data. Check which ham radio bands are open — 160m through 10m — before you transmit.
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RELATED APPLICATIONS
PhantomGram SPECTRUM PAINTER
Spectrum painting for amateur radio. Transmit and decode images painted onto SDR waterfall displays.
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PhosphorCW CW DECODER
Real-time Morse code decoder. CW signal detection via your iPhone microphone with automatic frequency and speed tracking.
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PhosphorCalc RF CALCULATOR
Ten RF and antenna calculators for amateur radio. Dipole lengths, path loss, SWR, link budgets, impedance matching. No network required.
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PhosphorFeld FELDHELL DECODER
Real-time Hellschreiber decoder. Feld-Hell signals via your iPhone microphone — the oldest digital mode still in use, where your own eyes do the decoding.
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PhosphorRTTY RTTY DECODER
Real-time RTTY signal decoder. Shortwave radio teletype via your iPhone microphone.
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PhosphorSSTV SSTV CODEC
Slow Scan Television encoder and decoder. Encode or decode SSTV images via your iPhone microphone — ten modes including Scottie, Martin, and Robot.
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PhosphorSWL SWL BROWSER
Shortwave broadcast schedule browser and numbers station reference. EiBi database, scanner, and Cold War SIGINT aesthetic.
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PhosphorTEX NAVTEX DECODER
Real-time NAVTEX maritime-safety decoder. 518 kHz gale warnings, SAR alerts, ice reports — CCIR-476 SITOR-B via your iPhone microphone.
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VT220 9600,8N1 BUF:64K SNR:NOMINAL