If you’ve ever tried to get started with digital modes, you’ve probably noticed that operators tend to gather on the same frequencies. Unlike voice contacts, where activity is spread across an entire band, digital operators usually meet on well-established “watering hole” frequencies. Knowing where those frequencies are can mean the difference between seeing a busy waterfall full of signals and wondering if your radio is even working.

This guide brings together the most commonly used amateur radio digital frequencies into one comprehensive reference. Whether you’re interested in FT8, FT4, PSK31, RTTY, SSTV, JS8Call, Olivia, Packet Radio, Winlink, or APRS, you’ll find the standard operating frequencies organized by band from 160 meters through 70 centimeters.

I’ve also included explanations of why these frequencies became standards, how dial frequencies differ from actual transmitted frequencies, and what kinds of activity you can expect on each band. While many of these frequencies are recognized worldwide, some digital operating practices vary by IARU region, so I’ve included notes where appropriate.

Understanding Ham Radio Digital Frequencies

One of the first things new digital operators discover is that everyone seems to congregate on specific frequencies. This isn’t required by FCC regulations or band plans. Instead, it’s a convention developed over decades so operators using the same software can easily find one another.

You’ll often hear these frequencies referred to as watering holes. Think of them as meeting places. Rather than scanning an entire amateur band looking for activity, software like WSJT-X, JS8Call, FLdigi, MMSSTV, or Winlink expects users to begin monitoring well-known frequencies.

Another point that confuses many newcomers is the difference between dial frequency and actual transmitted frequency.

When someone says:

“FT8 is on 14.074 MHz.”

they’re referring to the radio’s dial frequency.

Your actual RF signal is usually offset somewhere inside your software’s audio passband. For example:

• Radio dial: 14.074 MHz
• Audio offset: 900 Hz
• Actual RF transmission: 14.074900 MHz

Meanwhile another station may be transmitting at:

• Audio offset: 1700 Hz

Their actual transmitted signal is:

• 14.075700 MHz

Both operators appear on the same waterfall and can communicate without ever changing their radio’s VFO. This is why dozens—or even hundreds—of FT8 QSOs can occur simultaneously on one dial frequency.

USB or LSB?

One of the nice things about digital modes is their consistency.

Today virtually every HF digital mode uses USB, even on bands where voice traditionally uses LSB (160m, 80m, and 40m).

Modern software assumes USB operation.

If you accidentally use LSB, your transmitted tones will be inverted and most stations won’t decode you.

Master Ham Radio Digital Frequency Chart

Band	FT8	FT4	PSK31	RTTY	SSTV	JS8Call	Olivia	Packet
160m	1.840	1.838	1.838	1.845	—	1.842	1.838	Varies
80m	3.573	3.575	3.580	3.590	3.845	3.578	3.583	3.585
60m	Regional	Regional	Regional	Regional	—	Regional	Regional	Regional
40m	7.074	7.0475	7.035	7.080	7.171	7.078	7.040	7.095
30m	10.136	10.140	10.140	10.142	—	10.130	10.142	10.147
20m	14.074	14.080	14.070	14.080–14.099	14.230	14.078	14.105	14.105
17m	18.100	18.104	18.100	18.102	—	18.104	18.106	18.100
15m	21.074	21.140	21.070	21.080	21.340	21.078	21.105	21.090
12m	24.915	24.919	24.920	24.925	—	24.922	24.922	24.925
10m	28.074	28.180	28.120	28.080	28.680	28.078	28.122	29.100
6m	50.313	50.318	—	—	50.700	50.318	—	50.620
2m	144.174	144.170	—	—	145.500 (regional)	—	—	145.010
70cm	432.174	432.170	—	—	—	—	—	433.100

(Frequencies are dial frequencies in MHz. Some frequencies vary by region and national band plans.)

160 Meter Digital Frequencies

The 160-meter band is often called the “Top Band.” Although it’s primarily known for nighttime DX and challenging propagation, it has become increasingly popular with weak-signal digital operators.

Because noise levels are usually much higher than on the upper HF bands, modes like FT8 and FT4 have become particularly valuable. Their ability to decode signals well below the noise floor makes them ideal for long-distance contacts that would otherwise be impossible.

JS8Call also sees regular activity here because its structured messaging performs well during difficult nighttime propagation.

Common Digital Frequencies (160m)

Mode	Dial Frequency	Notes
FT8	1.840 MHz	Primary worldwide watering hole
FT4	1.838 MHz	Contest and faster exchanges
PSK31	1.838 MHz	Limited activity
RTTY	1.845 MHz	Contest weekends
JS8Call	1.842 MHz	Messaging and weak signal
Olivia	1.838 MHz	Occasional emergency use
Packet	Varies	Rare

Activity increases dramatically during winter DX season when nighttime propagation improves.

80 Meter Digital Frequencies

Eighty meters is one of the busiest digital bands after sunset. Regional contacts are common throughout the evening, while nighttime often opens surprisingly long-distance paths.

Emergency communications organizations also make heavy use of this band, particularly with Olivia, Winlink, and NBEMS traffic.

Common Digital Frequencies (80m)

Mode	Dial Frequency	Notes
FT8	3.573 MHz	Primary FT8 frequency
FT4	3.575 MHz	Contest operation
PSK31	3.580 MHz	Keyboard chat
RTTY	3.590 MHz	Traditional RTTY
SSTV	3.845 MHz	Occasional image transmissions
JS8Call	3.578 MHz	Popular messaging
Olivia	3.583 MHz	Emergency communications
Packet	3.585 MHz	Regional packet activity

During winter evenings this band can be active for hundreds of miles using relatively modest power.

60 Meter Digital Frequencies

Unlike most amateur bands, 60 meters is channelized in many countries. Because of varying regulations, digital operation differs significantly depending on where you live. Many countries restrict permitted bandwidth, ERP, and even which digital modes may be used. For that reason, operators should always verify their national regulations before transmitting on 60 meters. FT8 remains one of the most common modes where permitted.

40 Meter Digital Frequencies

Forty meters is arguably the workhorse of amateur radio digital communications. It provides reliable regional coverage during daylight hours and excellent DX opportunities after sunset. Almost every digital mode can be found somewhere on this band. FT8 activity is nearly continuous around the clock, while JS8Call enjoys one of its largest communities here.

Common Digital Frequencies (40m)

Mode	Dial Frequency	Notes
FT8	7.074 MHz	One of the busiest frequencies in amateur radio
FT4	7.0475 MHz	Contest mode
PSK31	7.035 MHz	Traditional watering hole
RTTY	7.080 MHz	Contest and DX
SSTV	7.171 MHz	Image transmissions
JS8Call	7.078 MHz	Worldwide messaging
Olivia	7.040 MHz	Emergency communications
Packet	7.095 MHz	HF packet

If you own an SDR, this is one of the most interesting bands to watch. During major openings you’ll often see hundreds of simultaneous digital signals spread across only a few kilohertz.

30 Meter Digital Frequencies

Thirty meters is unique. Because contests are prohibited on this band, it has become one of the premier locations for digital communication. You’ll find a steady mix of FT8, PSK31, Olivia, Winlink, and weak-signal experimentation nearly every day. Many experienced operators consider 30 meters the most civilized digital band on HF.

Common Digital Frequencies (30m)

Mode	Dial Frequency	Notes
FT8	10.136 MHz	Primary frequency
FT4	10.140 MHz	Moderate activity
PSK31	10.140 MHz	Keyboard QSOs
RTTY	10.142 MHz	Regular use
JS8Call	10.130 MHz	Messaging
Olivia	10.142 MHz	Weak signal
Packet	10.147 MHz	HF packet

Because no contest activity is permitted, this band is an excellent choice for casual digital operating.

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20 Meter Digital Frequencies

If there is one band that defines modern amateur radio digital communication, it is 20 meters. Nearly every digital mode has a permanent home here, and propagation supports worldwide contacts throughout much of the day. During solar maximum, the waterfall around 14.074 MHz can become almost completely filled with FT8 signals, with stations from every continent visible simultaneously.

RTTY contests continue to attract thousands of participants, while PSK31 remains popular for conversational keyboard QSOs. SSTV operators regularly exchange images around 14.230 MHz, and JS8Call users maintain an active international messaging network near 14.078 MHz. For many operators, 20 meters is the first band to check when testing a new digital mode or antenna because activity is consistently high and DX opportunities are plentiful.

Common Digital Frequencies (20m)

Mode	Dial Frequency	Notes
FT8	14.074 MHz	World’s busiest digital frequency
FT4	14.080 MHz	Contest and rapid QSOs
PSK31	14.070 MHz	Classic PSK31 watering hole
RTTY	14.080–14.099 MHz	Contest and DX activity
SSTV	14.230 MHz	International SSTV calling frequency
JS8Call	14.078 MHz	Worldwide messaging
Olivia	14.105 MHz	Weak-signal keyboard chat
Packet	14.105 MHz	Limited HF packet

17 Meter Digital Frequencies

The 17-meter band occupies a sweet spot between the dependable propagation of 20 meters and the higher-frequency performance of 15 meters. Because it is a WARC band, contests are generally avoided, making it an excellent place for relaxed digital operating. When solar conditions are average or better, 17 meters frequently supports DX into Europe, South America, and Asia while remaining far less crowded than 20 meters. If you enjoy longer keyboard conversations or experimenting with less common digital modes, this band deserves more attention than it often receives.

FT8 activity is steady throughout the day, while JS8Call, Olivia, and PSK31 all have regular users.

Common Digital Frequencies (17m)

Mode	Dial Frequency	Typical Use	Notes
FT8	18.100 MHz	Weak-signal DX	Primary worldwide frequency
FT4	18.104 MHz	Fast contacts	Moderate activity
PSK31	18.100 MHz	Keyboard QSOs	Shared with FT8 activity nearby
RTTY	18.102 MHz	Contest-free operation	Light activity
JS8Call	18.104 MHz	Messaging	Growing community
Olivia	18.106 MHz	Weak signal	Emergency-capable mode
Packet	18.100 MHz	Experimental	Rare

15 Meter Digital Frequencies

Fifteen meters has enjoyed a tremendous resurgence thanks to the current solar cycle. During solar maximum, this band often opens worldwide for many hours each day, allowing even modest stations to work impressive DX using low power. Digital activity has grown dramatically over the past few years. FT8 dominates, but FT4 becomes particularly busy during contests because operators can complete QSOs nearly twice as quickly.

Unlike 20 meters, the waterfalls are often less crowded, making it easier to identify weaker stations.

Common Digital Frequencies (15m)

Mode	Dial Frequency	Typical Use	Notes
FT8	21.074 MHz	Worldwide DX	Primary frequency
FT4	21.140 MHz	Contest operation	Fast exchanges
PSK31	21.070 MHz	Keyboard chat	Traditional watering hole
RTTY	21.080 MHz	Contest/DX	Active during major contests
SSTV	21.340 MHz	Image transmissions	International SSTV
JS8Call	21.078 MHz	Messaging	Worldwide activity
Olivia	21.105 MHz	Weak-signal communications	Moderate use
Packet	21.090 MHz	HF packet	Limited

When conditions are favorable, operators running only 25 to 50 watts routinely make intercontinental contacts.

12 Meter Digital Frequencies

Although sometimes overlooked, 12 meters shares many of the propagation characteristics of 10 meters while generally attracting fewer operators. During good solar conditions it can provide excellent DX with remarkably little congestion. Because it is another WARC band, contest interference is minimal.

Common Digital Frequencies (12m)

Mode	Dial Frequency	Typical Use
FT8	24.915 MHz	Weak-signal DX
FT4	24.919 MHz	Fast QSOs
PSK31	24.920 MHz	Keyboard chat
RTTY	24.925 MHz	General operation
JS8Call	24.922 MHz	Messaging
Olivia	24.922 MHz	Weak signal
Packet	24.925 MHz	Experimental

This band is often an excellent indicator that 10 meters is about to open.

10 Meter Digital Frequencies

Ten meters may be the most exciting amateur band during periods of high solar activity. Signals can travel around the world using surprisingly low power, and the band can change from completely dead to incredibly busy within minutes. FT8 has become the dominant digital mode here because it quickly reveals when the band is opening. Many operators leave WSJT-X monitoring 28.074 MHz throughout the day, using it as an early warning system for improving propagation.

Once openings develop, operators frequently switch to voice, CW, or other digital modes.

Common Digital Frequencies (10m)

Mode	Dial Frequency	Typical Use	Notes
FT8	28.074 MHz	Primary worldwide frequency	Extremely active
FT4	28.180 MHz	Contest operation	Moderate activity
PSK31	28.120 MHz	Keyboard QSOs	Traditional watering hole
RTTY	28.080 MHz	Contesting	Popular during major events
SSTV	28.680 MHz	Image transmission	International SSTV
JS8Call	28.078 MHz	Messaging	Increasing activity
Olivia	28.122 MHz	Weak-signal communications	Occasional
Packet	29.100 MHz	Experimental packet	Rare

6 Meter Digital Frequencies

Known as The Magic Band, six meters is famous for its unpredictable propagation. Operators may experience local communication one moment and work another continent a few minutes later through sporadic-E, tropospheric ducting, meteor scatter, or even F2 propagation during strong solar cycles. Digital modes have transformed six-meter operating because they can detect openings that would otherwise go unnoticed.

FT8 has become the standard mode for monitoring propagation, while MSK144 is widely used for meteor scatter.

Common Digital Frequencies (6m)

Mode	Dial Frequency	Purpose
FT8	50.313 MHz	Weak-signal DX
FT4	50.318 MHz	Fast QSOs
MSK144	50.260 MHz	Meteor scatter
JT65	50.276 MHz	Legacy weak signal
SSTV	50.700 MHz	Image transmissions
Packet	50.620 MHz	Experimental

If you’re interested in watching band openings develop in real time, keeping WSJT-X monitoring 50.313 MHz is one of the best propagation indicators available.

2 Meter Digital Frequencies

While most amateur operators associate two meters with FM repeaters, the band also supports a surprisingly active digital weak-signal community. Using horizontally polarized antennas and SSB equipment, operators regularly work stations hundreds of kilometers away via FT8, meteor scatter, moonbounce (EME), and tropospheric enhancement.

Packet radio also remains active in many regions, particularly where Winlink gateways are available.

Common Digital Frequencies (2m)

Mode	Dial Frequency	Purpose
FT8	144.174 MHz	Weak-signal DX
FT4	144.170 MHz	Contest operation
MSK144	144.360 MHz	Meteor scatter
JT65	144.120 MHz	Legacy weak signal
Packet (1200 baud)	145.010 MHz*	Regional packet
APRS	144.390 MHz (Region 2)	Position reporting
VARA FM / Winlink	Regional	RMS gateways

* Packet frequencies vary significantly by country and local coordination plans.

70 Centimeter Digital Frequencies

Seventy centimeters has become the center of modern digital networking. In addition to traditional packet radio, many operators use D-STAR, DMR, Yaesu System Fusion (C4FM), M17, and other digital voice technologies. Unlike HF digital modes, many UHF digital systems operate through repeaters connected to worldwide networks.

Weak-signal enthusiasts also use FT8 and other digital modes on horizontally polarized SSB frequencies.

Common Digital Frequencies (70cm)

Mode	Dial Frequency	Purpose
FT8	432.174 MHz	Weak-signal DX
FT4	432.170 MHz	Fast contacts
Packet	433.100 MHz*	Packet radio
D-STAR	Regional repeaters	Digital voice
DMR	Regional repeaters	Digital voice
System Fusion (C4FM)	Regional repeaters	Digital voice
M17	Regional repeaters	Open-source digital voice

Again, local repeater coordination determines exact repeater frequencies and offsets.

Digital Voice vs. Digital Data

Although they’re often grouped together, digital voice and digital data are fundamentally different. Digital data modes such as FT8, PSK31, Olivia, JS8Call, SSTV, and RTTY exchange computer-generated information over SSB transmissions. Digital voice systems—including DMR, D-STAR, Yaesu System Fusion, NXDN, P25, and M17—digitize your speech before transmitting it. Most operate through repeaters rather than the shared “watering hole” frequencies common on HF.

For that reason, you’ll usually program digital voice channels from local repeater directories instead of relying on fixed national calling frequencies.

Winlink and VARA

Winlink deserves special mention because it has become one of the most important digital communication systems in amateur radio. Using software such as VARA HF or VARA FM, operators can exchange email, weather bulletins, emergency traffic, and files over amateur radio without relying on the Internet. Unlike FT8, there is no single Winlink frequency. Instead, thousands of RMS Gateway stations operate on coordinated frequencies around the world. Your Winlink software automatically maintains an up-to-date directory of available gateways.

During emergencies, Winlink is frequently used by emergency management agencies, ARES groups, and disaster relief organizations to move formal traffic when conventional communications fail. Good choice. Those sections would add length, but they won’t contribute much SEO value for the keywords this page is targeting. That leaves us with a much tighter authority article that stays focused on what visitors actually want: accurate frequencies and enough explanation to use them confidently.

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Understanding the Most Popular Digital Modes

FT8

FT8 has become the most widely used digital mode in amateur radio. Developed by Joe Taylor (K1JT) and Steve Franke (K9AN), it was designed for making reliable contacts under extremely weak signal conditions. Even signals that are inaudible to the human ear can often be decoded successfully. Unlike traditional keyboard chat modes, FT8 exchanges only a small amount of information. A typical contact consists of call signs, signal reports, grid squares, and confirmations, all completed automatically in about 90 seconds.

If you’re looking for DX or want to test antenna performance, FT8 should be your first stop.

FT4

FT4 is closely related to FT8 but was designed for speed rather than ultimate weak-signal performance. Transmit and receive cycles are 7.5 seconds instead of 15 seconds, allowing contacts to be completed much more quickly. Because of its faster pace, FT4 is especially popular during contests where operators are trying to maximize their contact rate.

PSK31

Before FT8 became the dominant digital mode, PSK31 was the king of keyboard-to-keyboard communication. PSK31 uses very little bandwidth—typically only around 31 Hz—which allows many conversations to occur within a narrow slice of spectrum. Unlike FT8, operators type directly to one another, making it ideal for ragchewing and casual conversations.

Although activity has declined over the past decade, PSK31 still maintains a loyal following worldwide.

RTTY

Radioteletype is one of amateur radio’s oldest digital modes and remains extremely popular during major contests. Using the five-bit Baudot code, RTTY predates personal computers by many decades. While newer digital modes outperform it under weak-signal conditions, its simplicity and contest support ensure it remains active.

During major international contests, you’ll hear thousands of RTTY signals across the HF bands.

JS8Call

JS8Call builds upon the FT8 protocol but adds conversational messaging. Instead of exchanging only signal reports, operators can send free-form text messages, relay traffic through intermediate stations, and even leave messages for later delivery.

Its ability to function under poor propagation conditions has made it increasingly popular among emergency communicators and operators interested in off-grid communications.

Olivia

Olivia was designed specifically for reliable communications under extremely poor signal conditions. Although it transfers data much more slowly than FT8 or PSK31, Olivia continues to decode successfully even when signals are buried deep in atmospheric noise.

Because of this reliability, many emergency communication groups recommend Olivia for disaster communications.

SSTV

Slow Scan Television allows amateur radio operators to exchange still images over ordinary SSB transmissions. Instead of transmitting video in real time, SSTV sends a single photograph over roughly 30 seconds to two minutes, depending on the mode selected.

Popular formats include Martin, Scottie, and Robot modes. The international SSTV calling frequency of 14.230 MHz remains one of the most recognizable frequencies on the HF bands.

Finally…

Digital communications have fundamentally changed amateur radio. Whether your goal is working rare DX with FT8, chatting through PSK31, exchanging pictures with SSTV, or sending emergency traffic using Winlink, knowing where operators gather is the first step toward making successful contacts. While these frequencies have become accepted operating standards throughout the amateur community, they are not fixed by regulation. Activity can shift over time as new software and operating practices emerge, so it’s always worth checking current band plans and observing the band before transmitting. I recommend bookmarking this page or printing the frequency tables for your shack. Having a quick reference nearby makes it much easier to jump between bands and digital modes without hunting through multiple websites or software documentation.

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