This is one of the most common questions I hear from hams getting into digital modes. FT8 and FT4 both run in WSJT-X and look almost the same on screen, but they’re built for different jobs.
Level: Beginner | Time: About 5 minutes
The Short Answer
- FT8 uses 15-second transmit periods. It’s slower but digs weaker signals out of the noise. It’s the everyday choice and where most of the activity is.
- FT4 uses 7.5-second periods, so contacts go about twice as fast. It was designed for contests, and it gives up a little sensitivity for that speed.
If you’re just getting started, stick with FT8. Try FT4 during a digital contest or when a band is busy and signals are strong.
What You’ll Need
- WSJT-X and your radio connected by USB (see this week’s earlier How-To posts).
- A paper logbook, if you like keeping a backup of your digital contacts.
Step 1: Switch Modes
In WSJT-X, open the Mode menu and choose FT4. Then pick your band again from the band box so the radio moves to the FT4 frequency.
Step 2: Know the Frequencies
FT4 lives on different frequencies than FT8. For example, on 20 meters FT8 is 14.074 MHz and FT4 is 14.080 MHz. On 10 meters FT8 is 28.074 MHz and FT4 is 28.180 MHz. WSJT-X sets these for you when you pick the band.
Gotchas
- No decodes after switching? You may still be on the FT8 frequency. Re-select the band.
- Clock accuracy matters even more with FT4’s shorter time slots.
Your Turn
Do you run FT8, FT4, or both? And what question should I answer next Friday? Leave it in the comments.
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