ARRL Field Day: What It Is and Why Your Call Sign Matters

ARRL Field Day, held on the fourth full weekend of June each year, is the largest amateur radio event in the United States. More than 35,000 operators participate annually, making it one of the most widely observed radio operating events in the world. Field Day is simultaneously a public demonstration of amateur radio, an emergency preparedness exercise, and a friendly competition.

What Is Field Day?

Field Day challenges amateur radio clubs and individuals to set up stations in temporary locations — parks, parking lots, campgrounds — and operate for 24 hours using emergency power (generators, solar, battery). The event tests operators' ability to deploy capable radio stations without permanent infrastructure, simulating post-disaster conditions.

Participants make as many contacts as possible during the 24-hour operating period on all amateur bands. Each contact requires exchanging a Field Day section code (the ARRL or RAC section where the station is located) along with the number and class designation.

Class Designations

Field Day stations are classified by the number of transmitters and power source:

• Class A: Club/group stations operating in the field on emergency power
• Class B: Single operator, battery-powered portable
• Class C: Mobile stations
• Class D: Home stations on commercial power
• Class E: Home stations on emergency power
• Class F: EOC (Emergency Operations Center) stations

Call Signs in Field Day

During Field Day, clubs often use their club call sign rather than individual operators' personal call signs. This is one of the most visible uses of club call signs — the call sign becomes the public face of the club during Field Day contacts and is how the club's score is submitted. Individual operators who participate in Field Day exchange their Field Day section, not their personal license class.

Who Can Participate?

Field Day welcomes licensed operators of all classes. Many clubs use Field Day as a recruiting event, inviting unlicensed members of the public to observe and even make supervised contacts under the supervision of a licensed control operator. It is an excellent introduction to the hobby for potential new licensees.