FT8 Hub
FT8 is a weak‑signal digital mode with 15‑second T/R cycles. It’s perfect for snagging DX when the band sounds dead — and for flexing your time‑sync game.
This page covers: a 3‑minute quick‑start, common activity centers, FT‑710/FT‑891 setup notes, software links, a clean‑TX checklist, and a small gallery.
⚡ Quick‑Start (WSJT‑X)
- Install WSJT‑X (or JTDX). In Settings → Radio: select your rig (CAT) and the correct COM port; set PTT via CAT or RTS/DTR.
- In Settings → Audio: choose the radio’s USB codec (FT‑710) or your external USB sound card (FT‑891).
- Sync the PC clock (system NTP or a time‑sync tool). Aim for < 1 s offset.
- On the rig, use the data audio path (USB‑D / DATA‑USB). Set power modest (25–50 W). Keep ALC barely moving.
- Pick a band and tune to the FT8 activity center (below). Watch decodes, then call or answer CQ.
Tip: Use PSK Reporter to see who heard you. It’s like radar for your signal.
📡 Common FT8 Activity Centers
These are widely‑used centers, not exclusive channels. Always follow your regional band plan and listen before you send.
| Band | Frequency (kHz) | Notes |
|---|---|---|
| 160 m | 1840 | Region‑specific; check local plan |
| 80 m | 3573 | Busy evenings |
| 40 m | 7074 | Very active worldwide |
| 30 m | 10136 | Data‑only band; mind power limits |
| 20 m | 14074 | Main highway for worldwide FT8 |
| 17 m | 18100 | Great daytime band |
| 15 m | 21074 | Lively when SFI is up |
| 12 m | 24915 | Often opens with 10 m |
| 10 m | 28074 | Local + DX when open |
| 6 m | 50313 | NA activity center (Es season) |
| 2 m | 144174 | EME/terrestrial digital sub‑band |
| 70 cm | 432174 | Check local activity |
Reminder: 60 m is channelized in some regions — follow local rules.
🛠️ Yaesu FT‑710 Notes (FT8)
- Audio I/O: Use the built‑in USB codec; set USB‑D so the data path bypasses mic EQ/compression.
- PTT: CAT is most reliable; DATA VOX also works.
- Filters: 3 kHz passband is fine; disable TX audio processing.
- Levels: Aim for 0 to just‑flickering ALC at 25–50 W. Lower if the rig gets warm.
🛠️ Yaesu FT‑891 Notes (FT8)
- Audio I/O: The USB port is CAT/control only. Use an external USB sound card interface into the rear DATA jack.
- Mode: DATA‑USB (or DATA‑LSB where applicable). Adjust DATA IN/OUT menu levels; MIC gain doesn’t affect the data path.
- PTT: Interface VOX or CAT (RTS/DTR).
- Levels: Keep ALC minimal at 20–40 W. Watch temperature on long runs.
💻 Software & Helpers
- WSJT‑X — the reference FT8 app (K1JT team).
- JTDX — alternative fork with extra decode tweaks.
- GridTracker — real‑time map/log helper (pairs with WSJT‑X).
- Time sync — use system NTP or a lightweight sync tool; keep offset < 1 s.
Pro‑tip: Enable PSK Reporter in WSJT‑X to auto‑spot decodes and visualize coverage.
🎯 Clean TX Checklist & Operating Tips
- ALC just flickering; reduce software/RIG input if it rises.
- Choose odd/even slot thoughtfully; avoid QRM when the passband is packed.
- Use Hold TX Freq and call off‑frequency to stand out.
- For DXpeditions, learn Fox/Hound mode (WSJT‑X) and split operation.
- Mind duty cycle; keep the rig cool on long runs.