JS8Call
JS8Call is a macOS digital communication app for amateur radio operators to exchange text messages over HF using weak-signal JS8 mode.
What is JS8Call?
JS8Call is a native digital communications application for amateur radio operators who want to send and receive keyboard-to-keyboard text over HF radio under weak-signal conditions. It is designed for conversational messaging rather than short contest-style exchanges, making it useful for casual contacts, group coordination, regional nets, and low-bandwidth emergency or field communication workflows. The app supports directed messages, relayed and store-and-forward messaging, heartbeat and grid monitoring, and message acknowledgments so operators can track who is active and whether traffic was delivered. On Mac, it is typically used alongside compatible radio hardware and timing-synchronized station setups. JS8Call is published by Chris Olson on the current official site, and the project continues to provide dedicated macOS downloads and user documentation.
Key features
- Send keyboard-to-keyboard text messages over HF using JS8 weak-signal digital mode
- Exchange directed messages with individual stations, groups, or all-call targets
- Relay traffic and use store-and-forward messaging when direct paths are unavailable
- Monitor heartbeats and grid activity to discover reachable stations
- Receive acknowledgments and delivery confirmations for sent messages
- Use message templates and callsign lookup tools during operating sessions
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Safety overview
Status: Mostly safe
JS8Call is legitimate amateur radio software, but it is intended for use with radio equipment and may interact with connected devices, station-control features, and local audio interfaces. Network activity and access to audio devices are normal for its purpose. Keep it if you actively use digital HF modes, and download updates only from the official project site to reduce the risk of modified builds.
Recommendation: Keep JS8Call if you use amateur radio digital messaging on your Mac. If you no longer operate with it, you can remove the app and its support files without affecting macOS, though doing so will remove your saved settings, logs, and operating data.
Common paths
/Applications/JS8Call.app
Support paths
~/Library/Application Support/JS8Call
Preference paths
~/Library/Preferences/org.kn4crd.js8call.plist
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