The HF Beacon project initiated by the , along with the has developed one of the most extensive HF beacon networks available to the radio amateur. Strategically located in 18 different countries, each beacon in the network transmits in an accurately timed sequence one after the other in 10 second intervals. To keep each beacon transmitting on time, GPS receivers are linked to hardware controllers designed specifically for the NCDXF network. All 18 beacons use transceivers and a 5 band R5 vertical.
Each beacon transmits its followed by four one-second dashes. The callsign and the first dash are sent at 100 watts. The remaining dashes are sent at 10 watts, 1 watt and 0.1 watts. The screenshot above graphically illustrates these power steps during an actual recording of the New Zealand beacon ZL6B.
Recorded at my QTH using the
Digital "Paint" recording software , you can
see the 10db drop in each dash as the line fades and thins into the noise.
Despite the 9,000 mile path from
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