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Offline ToolVARA HF Reference
VARA modem settings and common HF frequencies for Winlink RMS sessions — higher throughput than legacy PACTOR when gateways support VARA.
Common VARA HF dial frequencies (MHz, USB)
Operate within your license privileges. Confirm gateway capability before relying on VARA in PACE Contingency.
| Band | Example dial | Notes |
|---|---|---|
| 40 m | 7.103 | Common Winlink/VARA segment — check gateway list |
| 30 m | 10.147 | Data segment — no phone on 30 m |
| 20 m | 14.105 | Daytime DX and regional gateways |
| 17 m | 18.105 | Mid-day openings |
| 15 m | 21.095 | Seasonal propagation |
| 12 m | 24.925 | Contingency when higher bands open |
| 10 m | 28.120 | Sporadic-E and solar-cycle dependent |
Modem settings (field reference)
- Bandwidth: VARA HF default 2.4 kHz — wider than PSK31; avoid QRM to adjacent weak-signal ops.
- Software: VARA HF modem + Winlink client (RMS Express, AirMail, etc.) — follow gateway RMS type.
- PACE: Document as Alternate/Contingency in PACE planner; Primary remains voice or simpler data path.
- Workflow: Winlink session workflow · gateway list · digital emcomm hub