# TropoDX

> TropoDX (iPhone/iPad app by Martin Kuera.)

- Source: https://appshunter.io/ios/app/tropodx/id6754292117 (this page in markdown: same URL + `.md`)
- Developer: [Martin Kuera](https://appshunter.io/developer/1846678892)
- Category: Utilities, Weather
- Price: $1.99
- Age rating: 17+
- Requires: iOS 17.6 · 3 MB
- Languages: American English
- Released: 2025-11-01
- Data updated: 2026-08-19
- User reviews in markdown: https://appshunter.io/ios/app/tropodx/id6754292117/reviews.md

## What is TropoDX?

TropoDX is the ultimate real-time tropospheric propagation monitoring tool for amateur radio operators worldwide.

FEATURES:
- Real-time Tropospheric Index (0-100 scale) based on atmospheric conditions
- 5-day propagation forecast with hourly updates
- Regional propagation maps for Europe, North America (East/West), Asia, and Australia/Pacific
- Push notifications for excellent DX conditions (Index 80+)
- Advanced atmospheric parameters: K-Index, Refractivity, Temperature-Dew Point spread
- Location-based weather data from anywhere in the world
- Detailed DX distance estimates based on current conditions
- Historical data tracking (last 48 readings)
- Support for both Metric and Imperial units
- Works on iPhone and iPad with landscape support

PERFECT FOR:
- VHF DXers (2m, 6m bands)
- UHF DXers (70cm band)
- Contest operators
- EME operators checking for optimal conditions
- Anyone interested in VHF/UHF propagation

UNDERSTANDING THE INDEX:
- 0-40: Poor - Normal conditions, local contacts only
- 40-55: Fair - Slightly enhanced propagation
- 55-70: Good - DX possible, 200-500 km range
- 70-85: Very Good - Strong DX, 500-1000 km range
- 85-100: Excellent - Extreme conditions, 1000+ km possible!

The app calculates tropospheric conditions using atmospheric pressure, temperature, humidity, dew point, and refractivity to predict VHF/UHF radio wave propagation. When high-pressure systems create temperature inversions, radio signals can travel much farther than normal - and TropoDX helps you catch those moments!

DATA SOURCES:
- Real-time weather data from OpenWeatherMap
- Regional propagation maps from DX Info Centre
- Scientific calculations based on radio refractivity formulas

Whether you're chasing grid squares, working DX contests, or just curious about propagation, TropoDX gives you the information you need to maximize your VHF/UHF operating.

73 and happy DXing!


## Version history (last 4 releases)

### 1.3 — 2026-06-30

- App now loads conditions automatically on launch — no need to tap "Get Started" every time
- Fixed tropospheric index calculation: sub-refractive conditions now correctly show lower values
- Fixed map view: target station now shows current conditions, not midnight values
- Timestamps now use the correct local timezone for each location
- Fixed pull-to-refresh and refresh button in the 5-Day Forecast tab
- Background refresh now reliably updates conditions and triggers notifications
- Fixed a crash when entering an invalid grid square in the map calculator
- Minor fixes and stability improvements

### 1.2 — 2026-06-09

What's New in 1.2

Improved accuracy – Tropospheric index now calculated using ITU-R P.453-14, the international standard for radio refractivity. Data sourced from Open-Meteo (GFS model) including atmospheric pressure levels up to 1500m altitude.
Band support – Select your band (6m / 2m / 70cm) for band-specific index, expected DX range, and operating advice.
History chart – New History tab with a chart of index development over time. Switch between 24h / 7 days / 30 days view.
Background notifications – App now checks conditions in the background and alerts you when your threshold is reached, even when closed.
Real trend indicator – Rising / Stable / Falling based on actual measurement history, not a fixed value.
No API key required – Switched from OpenWeatherMap to Open-Meteo (free, no registration).

### 1.0.1 — 2025-12-14

Version 1.0.1

Bug Fixes & Improvements:
- Fixed text visibility in Grid Locator tab when using dark mode
- Improved UI contrast for better readability in both light and dark modes
- Enhanced user interface polish and refinements
- Added DX Info Centre reference link in Information tab
- Minor performance improvements

Thank you for using TropoDX! 73!

### 1.0 — 2025-11-01

No release notes.

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## More apps by Martin Kuera

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- [Stop Social](https://appshunter.io/ios/app/stop-social/id6758787285)

All apps by Martin Kuera: https://appshunter.io/developer/1846678892

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*