If you’re really serious about FT8, give it enough computing power to deliver best results for you
Getting the most out of amateur radio’s FT8. FT8, FT4 et al, modes of transmission is all about weak signals. Maximize your potential.
When band conditions are less than stellar or downright poor — there’s nothing to listen to on phone or CW — you’ll most likely find the digital frequency segments of the HF bands, 14.074 MHz for example, teeming with activity. A LOT of activity.
FT8…revolutionized ham radio by creating a new niche in our hobby where $20 worth of a wire antenna and a low power transceiver can work the world. Thousand of dollars worth of heretofore Yaesu, Icom, FlexRadio or Elecraft transceivers along with tens of thousands of dollars worth of bare metal outside your shack need not apply. You just don’t need that.
When Joe Taylor, K1JT, and his team first released FT8 in June 2017, I became a convert by October 2017 and immediately became hooked. To get started I through together an old Icom IC-718 running approximately 20 watts into a 10-160m ground-mounted DX Engineering vertical. I used a West Mountain Radio digital interface to an old PC because the Icom had no built-in support for the digital protocols.
What exactly is FT8?
FT8 (Franke-Taylor 8-FSK) is a digital communication mode used by amateur radio operators to make contact under extremely weak signal conditions. Named after its developers, Joe Taylor (K1JT) and Steve Franke (K9AN), it has become the most widely used digital mode in ham radio since its release in 2017.
Key Technical Characteristics
8-FSK Modulation: Information is transmitted using 8-frequency shift keying, sending audio tones spaced 6.25 Hz apart.
Narrow Bandwidth: An FT8 signal occupies only 50 Hz of bandwidth, allowing dozens of simultaneous conversations to fit inside a standard single voice channel (3 kHz).
15-Second Time Slots: Transmissions occur in strict 15-second cycles (12.64 seconds of audio burst, followed by ~2.36 seconds of decoding time).
Strict Time Sync Required: Transceivers and computer systems must be synchronized using Network Time Protocol (NTP) or GPS to within ~1 second for successful decoding.
Low Signal-to-Noise Capability: FT8 can decode signals down to -21 dB below the noise floor—far below what the human ear can hear.
Core Hardware & Software Setup
Operating FT8 requires interfacing a HF or VHF/UHF transceiver with a computer.
Software: WSJT-X (the primary reference implementation), JTDX, or MSHV.
Audio Interface: A digital sound card interface (such as a Digirig, Signalink, or built-in USB sound card on modern radios) to feed audio between the radio and computer.
Rig Control (CAT): Computer control to automatically key the transmitter (PTT) and switch frequencies.
Why It Is Popular
Low Power / QRP Efficiency: High contact rates are achievable using 5 to 25 Watts of RF power paired with simple wire or compromise antennas.
Extreme Propagation Testing: Works reliably during poor band conditions or solar minimums when voice (SSB) and Morse code (CW) cannot get through.
Automated Spotting: Integrated platforms like PSK Reporter allow operators to instantly see on a global map where their signal is being heard in real time.
My initial QSO results left me speechless. I was working the world with 20 watts into a ground-mounted 10-160m vertical. And later on, Bouvet Island on 30 meters FT8 during that somewhat ill-fated 3Y0J DXPedition.
Back then…for a long time…I didn’t realize that my FT8 receive has being hampered my insufficient CPU power for FT8 decoding. Digital modes require CPU horsepower. I replaced my old 4GB Intel-Duo laptop with a more powerful machine and my improved results were downright astonishing.
Fast forward to 2025. I recommend you consider dedicating a laptop for your digital operations. Today’s machines can be very powerful with respect to FT8 and don’t cost an arm and a leg…Whether you’re new to FT8 or experienced, give yourself enough hardware horsepower.
The right horsepower at the right price
Here are the basic requirements I suggest:
Windows or Linux operating system
16GB RAM minimum
SSD internal storage
Ryzen i7 or Intel i7 CPU or later
As of this writing, here is an Acer laptop which is available on Amazon and it meets the above specs. I use a similar machine and am very pleased with its results. FT8 is all about deep decoding. Your PC does that — not your rig — not your antenna.
Hope you enjoy FT8 as much as I do. 73 de K7UU.