FT4 halves FT8’s transmit slot to speed up contest exchanges, at the cost of some sensitivity. Outside contest weekends it is fairly quiet.
Everything that applies to FT8 applies here, including the clock accuracy requirement.
At a Glance
- Category
- Digital data
- On the air since
- 2019
- Bandwidth
- About 90 Hz
- Speed
- 7.5-second sequences
- What you need
- The same sound card interface as FT8
- Where to listen
- Dedicated FT4 frequencies, busiest during digital contests