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Field Day is an annual amateur radio contest, widely sponsored by IARU regions and member organizations, encouraging emergency communications preparedness [1] among amateur radio operators. In the United States, it is typically the largest single emergency preparedness exercise in the country, with over 30,000 operators participating each year.
Teams were provided with larger antennas and 700 watt amplifiers in 2006, to help compensate for the greater distance from Brazil to the main centers of contesting activity in Europe and North America. Despite taking place during the solar minimum, the contest coincided with a short spike in conditions on the HF bands allowing high scores.
In the United States, amateur radio AM activity can be found on mediumwave, MF and shortwave, HF frequencies (in MHz) which include 1.880-1.890, 3.885, 7.290, 14.286, 21.390, and 29.000-29.200, and feature swap nets that cater to interest in vintage AM equipment.
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In the CQ World Wide DX Contest, the world's largest HF contest, leading multi-operator stations on phone and CW can make up to 25,000 contacts in a forty-eight-hour period, while even single operators with world-class stations in rare locations have been known to exceed 10,000 contacts, an average of over three per minute, every minute.
The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska of Hartford, Connecticut.
Radio direction finding equipment for eighty meters, an HF band, is relatively easy to design and inexpensive to build. Bearings taken on eighty meters can be very accurate. Competitors on an eighty-meter course must use bearings to determine the locations of the transmitters and choose the fastest route through the terrain to visit them.