I covered what Winlink is and why EmComm operators lean on it so heavily, but I skipped the actual decision every Winlink station has to make: which modem are you running. This is not a minor detail. It is the single biggest cost and performance decision in the whole setup.
VARA: The Software Modem Most People Start With
VARA, in both its VARA HF and VARA FM versions, is a software modem that runs on your computer and talks to your radio through the exact same sound card interface you would use for FT8, a Digirig or equivalent. It is free to install and use at a capped data rate, which is genuinely enough for most casual Winlink email traffic. Unlocking full speed requires a paid license, but even that license is a fraction of the cost of a hardware modem, which is why VARA has become the default starting point for most home EmComm setups.
PACTOR: The Hardware Standard Some Agencies Still Require
PACTOR, specifically the SCS PACTOR-4 modem, is dedicated hardware, and it is expensive, often well over a thousand dollars for a single unit. What that money buys is genuinely superior performance in poor conditions, weak signals, high noise, and marginal propagation, where PACTOR keeps a connection and keeps moving data when a software modem would drop it. Some served agencies still specify PACTOR for exactly that reason, and if you are trying to plug into a specific ARES or RACES group’s existing infrastructure, check what they actually require before you buy anything.
What This Actually Means for Your Setup
For the overwhelming majority of home stations, VARA is the practical answer. It uses hardware you likely already own for FT8, costs little to nothing to try, and handles routine Winlink message traffic without issue. PACTOR earns its cost when you are operating in genuinely poor conditions on a regular basis, or when a served agency you support has already standardized on it and compatibility is not optional. Buying PACTOR because it sounds more serious, without an actual reason tied to your mission or your conditions, is spending a lot of money to solve a problem you do not have.
Start Cheap, Upgrade if You Actually Need To
My advice for anyone setting up Winlink for the first time is to start with VARA using gear you likely already have on the bench, get comfortable with the message flow, and only look at PACTOR if you run into a specific limitation VARA cannot solve. That is a far cheaper way to find out whether you even like running Winlink regularly before committing serious money to the hardware version of the same basic idea.
Related reading: What Is VARA? · ARDOP vs VARA · Setting Up Winlink: RMS Express, VARA