The ARRL Field Day, is conducted by the ARRL the fourth full weekend every June. Field Day encourages the use of radio equipment outside of permanent buildings and using electricity other than conventional mains. Field Day has several purposes:
First and foremost, ARRL Field Day stresses emergency preparedness. During this exercise, entire radio clubs get involved, and take "Field" Day literally, erecting numerous radio masts and towers, each bearing several antennas, in a field, parking lot or in a major park. Most Field Day operations use generators to provide power to ham radio transceivers.
The goal of ARRL Field Day is to work, or contact, as many stations as possible throughout the 24-hour duration of Field Day. The Field Day exchange is one's callsign, along with the number of stations in simultaneous operation, followed by a letter (A-F) designating the method in which the stations are being powered, such as by generator, solar power, or conventional mains AC.
2017 Field Day Operations