JS8Call & Fldigi (Weak-Signal HF Keyboard Messaging)
Decodes keyboard-to-keyboard text messages, automatic station heartbeats, and synoptic weather charts down to -24 dB below the audible noise floor—long after voice signals have faded into static.
Verified UK Configuration Blueprint & Ofcom Clearance
UK / European HF Calling Frequencies (USB Mode): 80m NVIS Night/Regional: 3.578 MHz • 40m UK Daytime: 7.078 MHz • 20m Europe: 14.078 MHz • German DWD Marine Weatherfax RTTY/WEFAX: 3.855 MHz & 7.880 MHz
UK Regulatory & Licensing Notes: Cleared for 100% licence-exempt shortwave & DWD Weatherfax reception (with RTL-SDR V4). HF transmission requires a valid UK Ofcom Amateur Radio Callsign and unencrypted cleartext.
Technical Deployment Specifications
| Software Stack | JS8Call & Fldigi (Weak-Signal HF Keyboard Messaging) (JS8Call v2.2 / Fldigi v4.2) |
|---|---|
| Open-Source Licence | GPL-3.0 Open Source |
| Supported Platforms | Windows • macOS • Linux • Raspberry Pi / ARM |
| Offline Storage Footprint | ~55 MB combined offline packages |
Paired UK Stocked Hardware & Related Software
- Companion Hardware: OGA-RF-055
- Companion Hardware: OGA-RF-003
- Companion Hardware: OGA-RF-004
- Companion Hardware: OGA-RF-052
- Companion Hardware: OGA-CMP-006
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Frequently Asked Questions
How should JS8Call & Fldigi (Weak-Signal HF Keyboard Messaging) be configured for legal off-grid use in the UK?
UK / European HF Calling Frequencies (USB Mode): 80m NVIS Night/Regional: 3.578 MHz • 40m UK Daytime: 7.078 MHz • 20m Europe: 14.078 MHz • German DWD Marine Weatherfax RTTY/WEFAX: 3.855 MHz & 7.880 MHz Regulatory status: Cleared for 100% licence-exempt shortwave & DWD Weatherfax reception (with RTL-SDR V4). HF transmission requires a valid UK Ofcom Amateur Radio Callsign and unencrypted cleartext.
Which UK hardware systems pair directly with JS8Call & Fldigi (Weak-Signal HF Keyboard Messaging)?
JS8Call & Fldigi (Weak-Signal HF Keyboard Messaging) (GPL-3.0 Open Source, footprint: ~55 MB combined offline packages) runs on Windows, macOS, Linux, Raspberry Pi / ARM and pairs directly with OGA-RF-055, OGA-RF-003, OGA-RF-004, OGA-RF-052, OGA-CMP-006.