What Is FT8?

FT8 (Franke-Taylor design, 8-FSK modulation) is a weak-signal digital mode developed by Nobel laureate Joe Taylor (K1JT) and Steve Franke (K9AN) and first released in 2017. It quickly became the most popular mode on HF, and for good reason: it allows operators to complete contacts under conditions where SSB phone or even CW would produce nothing but noise.

The "weak signal" part is key. FT8 can decode signals 18 dB below the noise floor — signals your ears would never detect. This makes it extraordinarily effective with low power (QRP) and simple antennas, which is why it resonates so strongly with apartment dwellers, HOA-restricted operators, and portable station builders.

How FT8 Works

FT8 operates on a rigid 15-second transmission cycle. Every exchange follows a defined sequence:

  1. Station A calls CQ (15 seconds)
  2. Station B responds with signal report (15 seconds)
  3. Station A confirms and sends their report (15 seconds)
  4. Station B sends RRR (roger) or RR73 (15 seconds)
  5. Station A sends 73 to close (15 seconds)

The entire QSO takes roughly 75–90 seconds. The software handles encoding, decoding, and timing automatically. Your computer's clock must be synchronized to within about ±1 second of UTC for decoding to work properly — use a time sync tool like Meinberg NTP or simply enable automatic time sync in your OS settings.

What You Need to Get Started

The hardware and software requirements for FT8 are straightforward:

  • An HF transceiver with USB or audio-out/PTT capability
  • A computer running Windows, macOS, or Linux
  • An audio interface — many modern radios (like the IC-7300) connect directly via USB and appear as a sound card. Older radios need a hardware interface like a Signalink USB.
  • WSJT-X software — free, open-source, and available from physics.princeton.edu/pulsar/k1jt/wsjtx.html

Setting Up WSJT-X Step by Step

  1. Download and install WSJT-X for your operating system.
  2. Open File → Settings and enter your callsign, grid square (look yours up at levinecentral.com/ham/grid_square.php), and select your radio interface.
  3. Configure audio input and output to point to your radio's soundcard or interface.
  4. Set CAT control (if your radio supports it) so WSJT-X can switch PTT and change frequency automatically.
  5. Set your transmit power to about 25–50% of maximum to start — FT8 is a continuous-duty mode and running at full power can stress some radios.
  6. Tune to an FT8 frequency (20m: 14.074 MHz is the most active; 40m: 7.074 MHz).
  7. Press Enable TX in the software and watch decode activity fill the screen.

FT8 Operating Frequencies

BandFT8 Frequency (USB Dial)
160m1.840 MHz
80m3.573 MHz
40m7.074 MHz
20m14.074 MHz
17m18.100 MHz
15m21.074 MHz
10m28.074 MHz

Logging and Awards

FT8 contacts count for DXCC, WAS, and virtually every other amateur radio award. Most operators use LOTW (Logbook of The World) for electronic QSL confirmation. WSJT-X can log directly to ADIF format, which imports into logging software like Log4OM, Ham Radio Deluxe, or N1MM Logger+. Many new HF operators find themselves earning their first DXCC entities within weeks of getting on FT8 — it's that accessible.