FT2 Digi-Mode

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FT2: A New Ultra-Fast Digital Mode for Amateur Radio

Introduction

Digital communication has become one of the most important developments in modern amateur radio. Over the past two decades, digital modes have allowed radio operators to communicate under weak signal conditions, share data, and automate contacts using computers connected to radio equipment. Among the most widely used digital modes are FT8 and FT4, both designed for efficient weak-signal communication.

In early 2026, a new experimental digital mode known as FT2 began appearing on amateur radio bands. Developed by Italian amateur radio operator Martino Merola (callsign IU8LMC), FT2 is designed to dramatically increase the speed of digital contacts while maintaining many of the core features used by earlier FT-series modes. The first successful FT2 contact was reported on February 16, 2026 during on-air tests on the 40-meter band.

FT2’s primary innovation is extremely short transmission cycles, allowing a complete contact (QSO) to occur in only a few seconds. This represents a significant step forward in high-speed digital communication and could influence the future development of amateur radio digital modes.

This report examines the design of FT2, how it works, its advantages and limitations, and how it compares to other popular digital modes used by amateur radio operators.

Background: Digital Modes in Amateur Radio

Digital modes allow radios and computers to exchange encoded signals rather than analog voice. Instead of transmitting speech directly, a computer converts information such as a callsign, signal report, or message into digital tones that are transmitted over radio frequencies.

The modern era of weak-signal digital communication began with the work of Joe Taylor, the Nobel Prize-winning physicist and amateur radio operator (K1JT) who helped develop several highly efficient digital modes.

The most influential modes include:

  • JT65

  • FT8

  • FT4

These modes are typically operated using the software package WSJT-X, which controls both the radio and computer audio interface.

FT8

FT8 became the most widely used digital mode shortly after its release in 2017. It uses 15-second transmission cycles and allows contacts even when signals are far below the noise floor.

FT4

FT4 was introduced later as a faster alternative to FT8. Its transmission cycles are about 7.5 seconds, making it more suitable for contesting.

However, many operators still wanted an even faster mode for high-rate contacts. This desire eventually led to the development of FT2.

Development of FT2

FT2 is a high-speed experimental digital protocol designed to push the limits of weak-signal digital communications.

It was developed by Martino Merola (IU8LMC) and tested by a small group of amateur radio operators in Italy. The software used for the mode is a modified version of WSJT-X called Decodium, which was adapted to support FT2’s shorter transmission cycles.

The first verified on-air FT2 contact occurred between two Italian stations on February 16, 2026. During these early tests, operators were able to complete full contacts in 7 to 11 seconds, demonstrating the potential of the new protocol.

This was significantly faster than existing modes:

Mode Typical QSO Time
FT8 ~60 seconds
FT4 ~30 seconds
FT2 ~7–11 seconds

These early results generated significant interest among amateur radio digital enthusiasts.

Technical Characteristics of FT2

FT2 was designed to maintain compatibility with many aspects of earlier FT-series digital modes while dramatically reducing the transmission cycle.

Transmission Cycle

The most significant feature of FT2 is its 3.8-second cycle time. This cycle includes both transmission and decoding phases.

By comparison:

  • FT8 uses a 15-second cycle

  • FT4 uses a 7.5-second cycle

  • FT2 uses 3.8 seconds

This means FT2 can theoretically support up to 240 contacts per hour, roughly four times the throughput of FT8.

Modulation and Encoding

FT2 uses many of the same encoding techniques found in FT8 and FT4.

These include:

  • 4-GFSK modulation

  • 77-bit message payload

  • LDPC forward error correction

The forward error correction scheme used is LDPC(174,91), which provides strong error-correction capabilities to ensure reliable decoding even when signals are weak.

Because of this similarity, FT2 can operate using the same message structure used by FT8.

Bandwidth

FT2 signals occupy approximately 167 Hz of bandwidth, slightly wider than FT8 signals but still very narrow compared with voice transmissions.

Narrow bandwidth provides several advantages:

  • Allows many signals to share a single band segment

  • Reduces interference

  • Improves signal-to-noise ratio

This efficiency is one of the reasons digital modes are so effective under weak signal conditions.

Signal Sensitivity

One trade-off of FT2’s speed is reduced weak-signal sensitivity.

Typical sensitivity levels:

Mode Sensitivity
FT8 about −21 dB
FT4 about −16.5 dB
FT2 about −9.5 dB

This means FT2 generally requires stronger signals than FT8 in order to decode reliably.

However, when signals are strong enough, FT2 offers significantly faster contacts.

Asynchronous Transmission

Another important feature of FT2 is asynchronous transmission.

Traditional FT-series modes rely on highly synchronized clocks. Operators must keep their computer clocks accurate so transmissions occur exactly at the start of each time slot.

FT2 removes this requirement by allowing transmissions to begin immediately after decoding, rather than waiting for the next time slot.

This reduces delays and speeds up the overall QSO process.

Typical FT2 Contact Sequence

Although FT2 is faster than earlier modes, the contact structure remains similar.

A typical FT2 contact includes the following exchanges:

  1. CQ call

  2. Response from another station

  3. Signal report exchange

  4. Acknowledgment

  5. 73 message

Because each transmission lasts only a few seconds, the entire exchange can be completed in under 10 seconds.

This efficiency makes FT2 particularly attractive for:

  • DXpeditions

  • Special event stations

  • Contest operations

Software Requirements

Operating FT2 requires specialized software capable of generating and decoding the FT2 waveform.

Currently, the experimental software used for FT2 testing includes:

  • Decodium digital mode software

  • Modified versions of WSJT-X

Operators also use common amateur radio digital tools such as:

  • GridTracker for mapping contacts

  • PSK Reporter for monitoring signal reports

Because FT2 is still experimental, it has not yet been integrated into the official WSJT-X software package.

Equipment Needed

Operating FT2 requires equipment similar to that used for other digital modes.

Typical station components include:

  1. HF transceiver

  2. Computer with digital mode software

  3. Sound card or audio interface

  4. Interface cable between the radio and computer

Many operators use radios such as:

  • Yaesu FT‑991A

  • Icom IC‑7300

These radios include built-in USB interfaces that simplify digital mode operation.

Advantages of FT2

Extremely Fast QSOs

FT2’s greatest advantage is speed. Completing a contact in under 10 seconds allows operators to make far more contacts in a given period.

This is especially valuable during:

  • DXpeditions

  • Special event stations

  • Digital contests

Efficient Spectrum Use

Shorter transmissions reduce the amount of time each station occupies the frequency.

This allows more stations to share the same band segment.

Reduced Synchronization Requirements

The asynchronous transmission design eliminates the need for extremely precise clock synchronization.

This simplifies station setup and operation.

Limitations and Criticism

Despite its advantages, FT2 has also generated some controversy within the amateur radio community.

Reduced Weak-Signal Capability

FT2 is less sensitive than FT8, meaning it may not work as well under poor propagation conditions.

This limits its usefulness for extremely weak signal contacts.

Experimental Status

FT2 is still an experimental mode and has not been officially adopted by most digital mode software.

Some operators are cautious about adopting new protocols until they become widely supported.

Automation Concerns

Like other FT-series modes, FT2 can be heavily automated.

Some amateur radio operators believe highly automated modes reduce the human interaction traditionally associated with amateur radio communication.

Online discussions have reflected mixed reactions, with some operators praising FT2’s speed while others question its practicality.

Potential Applications

Despite the debates surrounding it, FT2 could prove useful in several areas.

Contesting

Digital contesting could benefit significantly from faster contact rates.

DXpeditions

Stations operating from rare locations could make more contacts with the global amateur radio community.

Research and Experimentation

FT2 provides an opportunity for amateur radio operators to experiment with high-speed digital communications.

Amateur radio has always been a platform for technological experimentation, and FT2 continues that tradition.

Future of FT2

The long-term future of FT2 remains uncertain.

Several factors will determine whether it becomes widely adopted:

  • Integration into WSJT-X

  • Support from major software developers

  • Adoption by contest organizers

  • Acceptance by the amateur radio community

It is possible that FT2 will evolve into a refined protocol or inspire future digital modes with similar characteristics.

Regardless of its final outcome, FT2 demonstrates how amateur radio continues to innovate and experiment with new technologies.

Conclusion

FT2 represents an exciting development in the field of amateur radio digital communications. Designed to dramatically increase contact speed, it reduces transmission cycles to just a few seconds while maintaining many of the technical features found in earlier FT-series modes.

By enabling contacts in as little as 7 to 11 seconds, FT2 offers a significant improvement in communication efficiency. Its use of modern modulation techniques, forward error correction, and asynchronous transmission demonstrates the continuing evolution of digital radio technology.

However, FT2 also introduces trade-offs. Reduced weak-signal sensitivity and its experimental status mean that it may not replace existing modes such as FT8 in the near future.

Even so, FT2 highlights the spirit of innovation that has always been central to amateur radio. As operators continue to explore and refine digital communication techniques, modes like FT2 may help shape the future of radio experimentation and global communication.