In amateur radio, the “QTH” Q-code means “What is your position?” when used as a question or “My position is…” when used as a statement. The Automatic Packet Reporting System® is a common avenue that amateur radio operators communicate their positions, among other useful information.

QTH.app is an APRS® client application exclusively for the macOS platform. It connects to the APRS network  via radio or Internet to help operators receive, transmit, and visualize information being shared over APRS.

MAJOR FEATURES

• Easy map navigation
• Supports connecting via:
  • Audio Modem – Use the internal Mac sound card
  • Serial KISS TNC
    • Special support for Mobilinkd Bluetooth TNCs
  • APRS-IS
  • AGWPE – exists, but buggy
• GPS Connections
  • Bluetooth GPS
  • Uses macOS Location Services in the absence of a GPS
• Support for drawing APRS shapes directly on the map
• Mapping APRS position reports, objects, etc
  • APRS symbols
  • Graphical display of speed and direction
  • Tactical callsigns
  • Station paths, including dead reckoning
  • Telemetry graphs
• APRS timeline
  • Go back in time and see where things were at a certain time
• Special weather station display, including wind barbs and temperature colors
• Location beaconing
  • SmartBeaconing™
• Instant Messaging
  • Store favorite ham radio contacts in the Apple Contacts
• Alerts
  • Integrated with macOS notification center
  • Custom matching rules
• Logs packets to database
• Comprehensive help system
• Offline maps
• Other types of maps, topographical, OpenStreetMap, OpenCycleMaps, etc
• Map grids USNG/MGRS,  Maidenhead
• APRS Queries
• Simple digipeater support

PLANNED FEATURES

• Multilingual support – Supports English now. French later. Other languages as I have help.
• Spoken voice alerts
• Rig control for tuning to frequency objects
• Local data sharing with other QTH instances on LAN – Intended for operations rooms
• Search and Rescue features
• External API for integrations

WHAT IT WON’T DO

• Collect data from weather stations. Check out WeeWX for this.

HELP

Browse the Help Book Online

PRICING

QTH.app follows a “freemium” pricing model. QTH.app is free to receive APRS traffic. The transmit functions require a software license. This serves a couple purposes: It allows verification that the person transmitting holds a valid amateur radio callsign and it puts a few dollars in my pocket.

If you would like to purchase a license, please visit the store: QTH.app License

 

---

QTH.app Changelog

v0.6.5

• Fixed problems caused by weather station info panel failing to load on older macOS versions
• Figured out a technique to decrease the delay between clicking a map annotation and the annotation being selected
• Fixed a crash due to color space conversion

v0.6.4

• ATTENTION ALL AUDIO MODEM USERS: This version fixes an inadvertent attenuation to the TX audio amplitude. The sine wave was being multiplied by 0.25, causing the resulting audio signal to only be a quarter of full volume. If you have increased the volume on your hardware to compensate for this, you will want to test with the new, non-attenuated output
• Added a delay to wait for Kenwood D710 to restart in KISS mode before attempting to send the first packet #115
• The new GPU-accelerated audio level meter was crashing on Macs without the necessary video card support. Added a fallback level meter to support these machines and resolve the crash.

 

---

DOWNLOAD QTH.app