IARU HF Championship: A Contest Guide for Every Station

Every July, thousands of stations around the world spend a weekend working each other in the IARU HF Championship, officially the IARU HF World Championship. It is one of the few major contests where everyone can work everyone, where the exchange is short and simple, and where the national society headquarters stations of many countries come on the air together. For a newcomer it is a friendly first serious contest; for a seasoned operator it is a fast, demanding sprint through a summer weekend.

This guide explains how the contest is organised, what you send and receive, why HQ stations matter, and how to plan a realistic effort whether you have a simple wire antenna or a multi-operator station. Rules change from time to time, so always read the current official rules before the contest; this article explains the structure and strategy rather than replacing them.

What the IARU HF Championship Is

The contest is sponsored by the International Amateur Radio Union, the federation of national amateur radio societies, and the rules and log handling are published by the ARRL, which acts as the IARU International Secretariat. According to the official IARU HF World Championship page, its objective is to support operating skills and technical investigation by having amateurs contact each other around the world, especially IARU member society headquarters stations.

The page lists the key timing: the contest runs on the second full weekend of July, beginning at 1200 UTC on Saturday and running through 1159 UTC on Sunday. Both single operator and multi-operator stations may operate the entire 24-hour period. That is an important difference from some other major contests, where single operators must take mandatory off-times or where the event lasts 48 hours.

The contest uses the traditional contest bands: 160, 80, 40, 20, 15 and 10 metres. The WARC bands are not used, in line with the long-standing practice of keeping contests off those bands.

The Exchange: Signal Report and ITU Zone

The exchange is the heart of the contest, and in the IARU HF Championship it is pleasantly short. According to the official page:

• Most stations send a signal report and their ITU zone number.
• IARU member society HQ stations send a signal report and the official abbreviation of their society, as listed on the IARU website.
• The IARU International Secretariat club station counts as an HQ station and sends IARU.
• Members of the IARU Administrative Council and the regional executive committees send AC, R1, R2 or R3 as appropriate.

Notice that the exchange uses ITU zones, not CQ zones. The two systems are different, and confusing them is one of the most common log errors in this contest. Check your ITU zone before the weekend and programme it into your logger. In large countries the zone depends on where you are, so a portable or remote operation may have a different zone from your home station.

Because the exchange is short, rates can be high. A good CW or SSB operator running stations can make contacts very quickly, and the limiting factor is often how accurately you copy calls rather than how long the exchange takes.

HQ Stations and Why They Matter

The feature that makes this contest unique is the participation of HQ stations. Many national societies put a special station on the air for the weekend, often a team of operators spread across several sites and bands, all signing a single headquarters callsign. These stations send their society abbreviation instead of a zone. The full list of societies and their abbreviations is published by the IARU member societies directory.

For a participant, HQ stations are valuable because they count as multipliers in their own right, separately from the zones. A strong HQ station may appear on every band and both modes, giving you many chances to collect it. For the society, operating an HQ station is a showcase and a team-building exercise, and many clubs contribute operators to their national effort.

HQ stations also make the contest sociable. Working the same HQ callsign on several bands, and recognising the operators behind it year after year, is part of what keeps people coming back.

Multipliers and Scoring in Practice

The score is the product of QSO points and multipliers. Multipliers come from ITU zones and from HQ and official stations. The exact counting rules, including how contacts in your own zone, on your own continent and on other continents are valued, and how multipliers are counted across bands and modes, are set out in the current IARU HF Championship rules. Read them once before the contest and make sure your logger is configured for this event, because it will calculate the score for you.

What matters for strategy is the general shape of the scoring:

• Contacts with distant stations are generally worth more points than contacts close to home, so working other continents pays.
• Each new zone or HQ station on a band adds a multiplier, so working the same multiplier on several bands increases your score.
• Both CW and phone are allowed, and you can work the same station on both modes on the same band, so mixed-mode operation creates more opportunities.

The official page also notes that certificates are awarded to the top scorer in each category within each ITU zone, each DXCC entity and each ARRL section, and that achievement awards are available for reaching a stated number of QSOs or multipliers. That makes the contest worthwhile even for small stations: you are competing in your own zone and country, not only against the world’s biggest stations.

Categories at a Glance

The contest offers single operator categories at several power levels and in CW, phone or mixed modes, as well as multi-operator categories. The precise list and the rules for assistance are in the official rules. Our guide to contest categories explains the general concepts, such as assisted versus unassisted and power classes.

A Strategy for Any Station

The IARU HF Championship takes place in July, which for the Northern Hemisphere means summer propagation: high absorption on the low bands during the day, short nights, and often good openings on the higher bands, sometimes helped by sporadic E. Your strategy should follow the bands rather than a fixed plan.

Before the contest

• Configure your logger for the IARU contest and enter your ITU zone. Our N1MM Logger+ setup guide covers the general steps for contest configuration.
• Load an up-to-date call history or check partial file if your logger supports it, so that zones and HQ abbreviations can be prefilled and checked.
• Look up which HQ stations are expected to be active. Many societies announce their HQ callsign in advance.
• Check your antennas on every contest band you intend to use, including 160 and 80 metres if you plan to work them at night.

During the contest

For most stations, a mix of running and search and pounce works best. When a band is open and you can hold a frequency, running gives the highest rate. When the rate drops, tune the band for new zones and HQ stations, then move to another band and repeat. Our article on run versus search and pounce explains how to judge when to switch.

Multipliers on the higher bands can appear and disappear quickly in summer. When 10 or 15 metres opens, it is often worth moving there immediately to collect zones and HQ stations that may not be available later. At night, the low bands give access to multipliers that are hard to find elsewhere, although summer static can make 160 and 80 metres hard work.

HQ stations are usually easy to find because they are loud and active, but they attract pileups. Note which bands you have already worked each one on, and look for it again on other bands when it is less busy.

Pacing a 24-hour contest

Although single operators may operate the full 24 hours, few do it without any break. Short rests at times of low activity, typically when your best band is closed and the low bands are not yet open, help you stay accurate through the night. Our guide to rest and time management in 24 and 48-hour contests has practical advice on when to sleep and when to push.

Accuracy and Log Submission

Because the exchange is short, the most common errors are busted callsigns and wrong zones. A wrong zone can cost you the QSO and the multiplier. Always confirm a zone that looks unusual for the callsign, and remember that portable stations or stations in large countries may legitimately send a different zone from the one you expect.

After the contest, submit your log promptly. The official page states that logs are due within seven days after the event and that electronic Cabrillo logs submitted through the ARRL web app are the preferred method. Our article on Cabrillo logs and the UBN process explains how log checking works and how to reduce the penalties that come from copying errors.

Even if you only make a few dozen contacts, send the log. Logs from small stations help the log checkers verify other entrants’ contacts, and your entry counts towards the results in your zone and country.

Why This Contest Is a Good First Big Contest

For operators new to contesting, the IARU HF Championship has several advantages over other major events. The exchange is short and easy to copy. Everyone can work everyone, so you are never limited to one part of the world. It lasts 24 hours rather than 48, so a modest effort feels meaningful. And because certificates are awarded at zone and country level, a newcomer can realistically achieve a good result in their own category.

It is also a good contest to practise mixed-mode operation, since you can work the same station on CW and phone. If you are still building a calendar of events to try, it sits conveniently in the middle of the year, between the big spring and autumn contests.

The Bottom Line

The IARU HF Championship is a 24-hour, everyone-works-everyone contest held on the second full weekend of July on the six traditional HF contest bands. Most stations send a signal report and ITU zone, while IARU member society HQ stations send their society abbreviation and count as multipliers in their own right. Set up your logger with the correct ITU zone, follow the bands as summer propagation changes, collect zones and HQ stations on as many bands as you can, pace yourself through the night and submit your Cabrillo log within the deadline. It is one of the most welcoming major contests on the calendar.

Frequently Asked Questions

When is the IARU HF Championship held?

According to the official ARRL page, it is held on the second full weekend of July, starting at 1200 UTC on Saturday and running through 1159 UTC on Sunday. Always check the current rules for the exact dates of a given year.

What is the exchange in the IARU HF Championship?

Most stations send a signal report and their ITU zone number. IARU member society headquarters stations send a signal report and their society abbreviation instead, and IARU officials send AC, R1, R2 or R3.

Is the IARU contest exchange CQ zone or ITU zone?

It uses ITU zones, not CQ zones. The two systems divide the world differently, so check your ITU zone before the contest and set it correctly in your logger to avoid exchange errors.

What are HQ stations in the IARU HF Championship?

HQ stations represent IARU member societies, usually national amateur radio associations. They often operate from several sites under one callsign, send their society abbreviation as the exchange and count as multipliers.

Which bands are used in the IARU HF Championship?

The contest uses the 160, 80, 40, 20, 15 and 10 metre bands. The WARC bands are not used, following the general practice of keeping contests off 30, 17 and 12 metres.

How do I submit my IARU HF Championship log?

Submit a Cabrillo log through the ARRL contest log submission web app within the deadline stated in the rules, which the official page gives as seven days after the event. Paper logs by mail are also accepted.