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PhosphorFAX

HF Weather Fax Decoder
Stuart Woolley · Weather
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App info

Developer
Stuart Woolley
Category
Weather, Utilities
Released
Oct 17, 2026
Version
1.0 (Oct 17, 2026)
Price
$0.99
Size
2.6 MB
Requires
iOS 27.0
Age rating
4+
Languages
English

In-app purchases

none
Current prices, App Store US.

About PhosphorFAX

PhosphorFAX receives radiofax, the HF weather fax that coast stations broadcast around the clock, and paints each chart line by line on a phosphor CRT display. Hold your iPhone near a shortwave receiver tuned to a weather fax station and watch surface analyses, wind and wave forecasts and ice charts arrive the way they do on a ship's recorder. It sends as well. Turn a photo, a received chart or the built-in test card into radiofax audio through the speaker, or export it as a WAV. No internet connection. No external hardware. No account. Just your iPhone and a radio. HOW TO RECEIVE Tune your receiver 1.9 kHz below the station's listed frequency in USB, so the signal sits around 1900 Hz. Then on the DECODE screen: ARM: wait for a start tone, then receive automatically START: receive now, without waiting for a start tone STOP: end the chart and save it CLEAR: discard the chart in progress…
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