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The 10-meter band is a portion of the shortwave radio spectrum internationally allocated to amateur radio and amateur satellite use on a primary basis. The band consists of frequencies stretching from 28.000 to 29.700 MHz.
[4] [5] In the United States, the Federal Communications Commission (FCC) only permits unattended 6-meter beacon stations to operate between 50.060 and 50.080 MHz. [ 6 ] Amateur beacons at 50 MHz have also been used as signal sources for academic propagation research [ 7 ]
30 metres – 10.100–10.150 MHz – 29.68–29.54 m actual; A very narrow band, which is shared with non-amateur services. It is recommended that only Morse code and data transmissions be used here, and in some countries amateur voice transmission is actually prohibited.
The World Administrative Radio Conference (WARC) bands are three portions of the shortwave radio spectrum used by licensed and/or certified amateur radio operators. They consist of 30 meters (10.1–10.15 MHz), 17 meters (18.068–18.168 MHz), and 12 meters (24.89–24.99 MHz).
As of December 2015, the sequential system for Group C assigns 2-by-3 formats. Call signs begin with the letter K in Regions 1 through 10 (continental United States), and with a W (along with an area specific 2nd letter and area-specific numeral) in Regions 11 through 13 (Alaska, the Caribbean, Hawaii and insular Pacific areas). [29]
Many civilian agencies use, or used to use, the frequencies 27.575 and 27.585 for low-power use. The US Coast Guard Auxiliary uses 27.980 MHz, it is similar to the Civil Air Patrol Frequency 26.620 MHz. [16] [17] [18] Amateur radio has an allocation starting at 28.000 MHz in the 10-meter band. [19]
It transmitted a 1 minute-long beacon every 10 minutes on 14.1 MHz using custom built transmitter and controller hardware. The signal consisted of the beacon's call sign transmitted in Morse code at 100 watts, four 9 second long dashes, each at 100 watts, 10 watts, 1 watt, and 0.1 watt, followed by sign-out at 100 watts. [3]
Particularly in the United States and at frequencies under 10 MHz, shortwave broadcasters may operate in between those bands, with the 60-meter band extending as high as 5.13 MHz, the 49-meter band down to 5.8 MHz, the 41-meter band as high as 7.78 MHz and the 31-meter band extending as low as 9.265 MHz.