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For estimate conditions on HF bands the network of beacons works. Each of beacons works on transmission within 10 seconds. Speed of 110 signs per minute. Output power - 100 W.
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All over again the beacon transmit callsign using complete power, then four pressing by duration 1 second everyone and for each pressing power different follow: 100 W, 10 W, 1 W, and 0,1 W.
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