The Complete FT8 Operating Guide
Learn what FT8 is, how weak-signal digital communication works, what equipment you need, how to configure WSJT-X, and how to make your first contact using the Yaesu FTX-1 Optima or another compatible amateur radio.
What Is FT8?
FT8 is a highly efficient amateur radio digital mode designed for reliable contacts in weak-signal and difficult propagation conditions.
FT8 was developed by Joe Taylor, K1JT, and Steve Franke, K9AN, as part of the WSJT-X software suite. Its name comes from the surnames Franke and Taylor and its use of eight-tone frequency-shift keying.
The mode exchanges short, structured messages in synchronized 15-second transmission periods. Because the software can decode signals well below the audible noise level, FT8 allows stations using modest antennas and relatively low power to make contacts over very long distances.
FT8 Is a Weak-Signal Mode
A signal does not need to sound strong—or even be clearly audible—to be decoded successfully by WSJT-X.
Why Operators Use FT8
- Excellent performance under weak conditions
- Worldwide activity on most amateur bands
- Effective with low power and simple antennas
- Fast, structured contact exchanges
- Automatic logging and spotting support
- Useful for testing antennas and propagation
- Suitable for portable and field operations
- Accessible to Technician operators on authorized bands
How an FT8 Contact Works
FT8 contacts use brief standardized messages exchanged in alternating 15-second time slots.
Synchronized Timing
Each transmission begins at a precise 15-second interval. Computer time must be accurately synchronized with UTC.
Eight Audio Tones
FT8 encodes information using eight closely spaced tones inside a narrow section of an SSB passband.
Weak-Signal Decoding
WSJT-X can often decode signals that are far below the noise floor and impossible to understand by ear.
Example FT8 Exchange
CQ KO6OFK CM97 N7XYZ KO6OFK -12 N7XYZ KO6OFK R-08 N7XYZ KO6OFK RR73 KO6OFK N7XYZ 73The messages identify the stations, exchange grid information, provide signal reports, and confirm completion of the contact.
Advantages and Limitations
Advantages
- Exceptional weak-signal capability
- Reliable long-distance communication
- Works well with low transmit power
- Supports compromised or portable antennas
- Large worldwide operating community
- Automated sequencing reduces workload
- Excellent for propagation analysis
- Easy integration with electronic logbooks
Limitations
- Not designed for extended conversations
- Requires a computer or compatible digital device
- Computer time must remain accurate
- Messages are short and highly structured
- Improper audio levels can create a poor signal
- High duty-cycle operation can heat the transmitter
- Contacts may feel less personal than voice operation
Equipment You Will Need
A basic FT8 station consists of a radio, computer, antenna, software, and a way to exchange audio and control commands.
Radio
An amateur transceiver capable of upper-sideband operation on the band you intend to use.
Computer
A Windows, macOS, or Linux computer capable of running WSJT-X and maintaining accurate system time.
Audio Interface
A built-in USB audio interface or an external device such as a DigiRig or SignaLink USB.
Antenna
A resonant or properly matched antenna suitable for the selected amateur band.
Modern Radios Often Need Only One USB Cable
Radios with built-in USB audio and CAT control can exchange receive audio, transmit audio, frequency data, mode information, and PTT commands through a single data-capable USB connection.
Recommended FT8 Software
WSJT-X
The primary application used for FT8, FT4, WSPR, Q65, JT65, and other weak-signal amateur radio modes.
Visit the WSJT-X Website →GridTracker
Provides mapping, logging integration, award tracking, call-sign information, and visual activity displays.
Visit GridTracker →JTAlert
Adds alerts, call-sign lookup, logging support, wanted-state tracking, and other operating enhancements.
Visit HamApps →Technician License Privileges
U.S. Technician-class operators may use FT8 where their license grants data privileges. Always verify the current FCC rules and applicable band plan before transmitting.
Best HF Starting Point for a Technician
The standard 10-meter FT8 activity frequency is 28.074 MHz USB. When 10 meters is open, Technician operators can make contacts throughout the United States and around the world.
| Band | Common FT8 Frequency | Technician Access | General Notes |
|---|---|---|---|
| 10 meters | 28.074 MHz | Yes | Primary HF FT8 option for U.S. Technician operators. |
| 6 meters | 50.313 MHz | Yes | Excellent during sporadic-E and other band openings. |
| 2 meters | 144.174 MHz | Yes | Activity varies by region and propagation conditions. |
| 70 centimeters | 432.174 MHz | Yes | Lower activity; often used for weak-signal experimentation. |
| 20 meters | 14.074 MHz | No | Requires General or Amateur Extra privileges. |
| 40 meters | 7.074 MHz | No | Requires General or Amateur Extra privileges. |
Common FT8 Frequencies
These are widely used dial frequencies. Activity may vary by region, event, contest, and band conditions.
| Band | Dial Frequency | Typical Mode |
|---|---|---|
| 160 meters | 1.840 MHz | USB / Data |
| 80 meters | 3.573 MHz | USB / Data |
| 40 meters | 7.074 MHz | USB / Data |
| 30 meters | 10.136 MHz | USB / Data |
| 20 meters | 14.074 MHz | USB / Data |
| 17 meters | 18.100 MHz | USB / Data |
| 15 meters | 21.074 MHz | USB / Data |
| 12 meters | 24.915 MHz | USB / Data |
| 10 meters | 28.074 MHz | USB / Data |
| 6 meters | 50.313 MHz | USB / Data |
| 2 meters | 144.174 MHz | USB / Data |
| 70 centimeters | 432.174 MHz | USB / Data |
Dial Frequency vs. Audio Frequency
The radio remains on the published dial frequency while WSJT-X places each station at a separate audio frequency within the radio’s passband. Operators do not normally tune the radio to each individual signal.
Yaesu FTX-1 Optima FT8 Setup
The following process provides a practical starting point for connecting the FTX-1 Optima to WSJT-X. Menu names and available rig profiles can change with radio firmware and software updates.
Install the Required Software
Install the current Yaesu USB drivers, if required for your operating system, followed by the latest stable release of WSJT-X.
Use a Data-Capable USB Cable
Connect the radio directly to the computer using a properly shielded USB cable that supports data transfer. Charge-only cables will not provide audio or CAT communication.
Identify the COM Port and Audio Device
In Windows Device Manager, identify the virtual COM port created by the radio. Also verify that the radio’s USB audio input and output devices appear in the Windows sound settings.
Set the Radio for Digital Operation
Select the radio’s USB data mode or digital-data operating mode. Disable speech processing, microphone equalization, and other voice-oriented transmit processing.
Configure WSJT-X Radio Control
Open File → Settings → Radio. Select the native FTX-1 profile when supported by the installed version. When no native profile is available, a compatible Yaesu CAT profile or an intermediary application such as FLRig may be required.
Select the USB Audio Devices
Open the WSJT-X Audio tab and select the FTX-1 USB audio device for both input and output. Do not select the computer’s built-in microphone or speakers.
Test CAT and PTT
Use the Test CAT button. A successful test should turn the button green. Then test PTT and confirm that the radio keys without producing unexpected RF output.
Set Your Call Sign and Grid
Enter your amateur radio call sign and Maidenhead grid square in the WSJT-X General settings before transmitting.
Starting WSJT-X Settings
Computer Time Synchronization
Accurate timing is essential. Even a properly configured station may fail to decode signals if the computer clock is significantly incorrect.
Windows Time
Enable automatic time synchronization and verify that the computer updates regularly.
Meinberg NTP
A popular option for operators who want more reliable and frequent computer time correction.
Portable Operation
When internet service is unavailable, a GPS-based time source or other accurate external reference may be used.
Watch the DT Column
WSJT-X displays a time-offset value called DT for decoded stations. Large or consistently unusual values may indicate a time synchronization problem at your station or the other station.
Audio Drive, ALC, and Transmit Power
Clean audio and reasonable transmitter loading are more important than simply using maximum output power.
Adjusting Transmit Audio
- Begin with a low WSJT-X power-slider setting.
- Place WSJT-X into transmit or tune mode.
- Increase audio drive gradually.
- Watch RF output and ALC indications.
- Stop increasing drive when the desired clean output is reached.
- Avoid aggressive ALC action or obvious compression.
Suggested Starting Power
| Power | Typical Use |
|---|---|
| 5 watts | QRP and experimentation |
| 10–20 watts | Routine contacts and portable operation |
| 25–50 watts | Difficult conditions or DX |
| Higher power | Use cautiously and only when necessary |
FT8 Has a High Duty Cycle
A radio operating FT8 may transmit at nearly full output for approximately 13 seconds at a time, repeatedly. Reduce power as needed, provide ventilation, and follow the radio manufacturer’s duty-cycle recommendations.
Making Your First FT8 Contact
Select an Authorized Band
Choose a band permitted by your license class. A U.S. Technician operator might begin on 10 meters at 28.074 MHz.
Allow the Waterfall to Populate
Listen for several cycles before transmitting. Confirm that signals appear in the waterfall and that WSJT-X is decoding stations.
Select a Clear Audio Frequency
Use the waterfall to choose an open section of the passband. Avoid transmitting directly on top of an existing signal.
Answer a CQ or Call CQ
Double-click a decoded CQ message to respond, or select “Call 1st” and enable transmitting to call CQ on your selected audio frequency.
Let the Sequence Complete
WSJT-X can automatically exchange reports and acknowledgments. Monitor the sequence and stop transmitting if the exchange becomes incorrect or another station is selected accidentally.
Log the Contact
When the exchange is complete, verify the call sign, band, signal report, date, time, and grid before saving the QSO.
Understanding FT8 Signal Reports
FT8 reports are signal-to-noise measurements expressed in decibels and should not be treated as conventional S-meter readings.
| Approximate Report | General Interpretation |
|---|---|
| +10 dB | Extremely strong signal; check for excessive drive if reports are unusually high. |
| 0 dB | Very strong and easily decoded. |
| -10 dB | Good signal with reliable decoding. |
| -18 dB | Weak but commonly workable. |
| -24 dB | Near the practical FT8 decoding threshold under favorable conditions. |
Using PSK Reporter
PSK Reporter collects reception reports from participating digital-mode stations and displays where signals are being heard.
What It Can Show You
- Which stations are receiving your signal
- Approximate propagation paths
- Signal reports from different locations
- Band openings and changing conditions
- Results of antenna or power adjustments
Open the Live Map
Enter your call sign, select the appropriate band and time period, and review the stations reporting reception of your transmitted FT8 signal.
Open PSK Reporter →Good FT8 Operating Practices
Recommended Practices
- Confirm that the frequency is authorized for your license.
- Keep the computer clock accurately synchronized.
- Use the minimum power needed for reliable communication.
- Transmit on a clear audio frequency when possible.
- Monitor transmitter temperature during extended operation.
- Verify contacts before uploading them to a logbook.
- Use split operation properly when calling rare DX.
- Maintain a clean signal with controlled audio drive.
Practices to Avoid
- Do not use excessive audio drive or heavy ALC.
- Do not transmit outside your authorized privileges.
- Do not call repeatedly on top of an active QSO.
- Do not assume more power always produces better results.
- Do not leave the station transmitting unattended.
- Do not use microphone processing for digital audio.
- Do not rely on an inaccurate computer clock.
Logging and Confirming Contacts
WSJT-X creates a local log and can exchange contact information with compatible logging applications.
Logbook of The World
ARRL’s electronic confirmation system for awards and verified amateur radio contacts.
Visit LoTW →QRZ Logbook
A popular online logbook with call-sign lookup and contact confirmation features.
Visit QRZ →Club Log
Provides DXCC tools, leaderboards, propagation analysis, and log-search functions.
Visit Club Log →eQSL
An electronic QSL-card and confirmation service used by amateur operators worldwide.
Visit eQSL →FT8 Troubleshooting Guide
WSJT-X shows signals, but nothing decodes.
WSJT-X does not show any receive audio.
The Test CAT button turns red.
The radio keys, but there is no RF output.
The radio produces full power with very low audio drive.
Other stations give unusually strong or poor reports.
The radio becomes hot during FT8 operation.
FT8 Resources and Downloads
WSJT-X Download
Download WSJT-X and review official installation and operating documentation.
WSJT-X Official Site →ARRL Band Plan
Review current U.S. amateur radio band-plan information and recommended operating segments.
View the ARRL Band Plan →FCC Amateur Radio Rules
Consult the official FCC rules to verify privileges, authorized modes, and operator responsibilities.
View FCC Part 97 →PSK Reporter
View live reception reports and evaluate where your digital signal is being received.
Open the Activity Map →Grid Square Locator
Find or verify a Maidenhead grid square for use in WSJT-X and amateur radio logging.
Open Grid Locator →Yaesu Support
Locate current radio manuals, firmware files, USB drivers, and manufacturer support information.
Visit Yaesu →Get on the Air with FT8
Start with a properly configured radio, clean audio levels, accurate computer time, and an authorized band. Even a modest station can make remarkable contacts when propagation is favorable.
Download WSJT-X