VARA HF modem settings, common Winlink frequencies, and bandwidth notes for high-throughput emcomm data sessions. Works offline after your first visit.

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VARA 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.

BandExample dialNotes
40 m7.103Common Winlink/VARA segment — check gateway list
30 m10.147Data segment — no phone on 30 m
20 m14.105Daytime DX and regional gateways
17 m18.105Mid-day openings
15 m21.095Seasonal propagation
12 m24.925Contingency when higher bands open
10 m28.120Sporadic-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

Common questions

What is VARA HF?

A high-throughput modem mode for Winlink RMS sessions when gateways support VARA — faster than legacy PACTOR on marginal HF.

Where does VARA fit in PACE?

Alternate or Contingency data path — document gateway frequencies and client software in your PACE plan.