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The fox/beacon project can also be used as a beacon transmitter. A beacon is an automated transmitter that sends its call letters and Morse code sequence of identification. Data sent by a beacon station could be location, purpose, call letters, and frequency. The transmitter turns on and off at selected intervals of time. The purpose of a beacon transmitter is to test frequency propagation conditions, or to test a particular band condition, in order to see if a band is open or usable at various times of the day and night. Beacon transmitters are set up for VHF/UHF bands as well for HF or shortwave bands. The study of radio propagation is an interesting and very useful aspect of amateur radio. There are numerous free and commercial software packages on the Internet for beacon clocks and timing programs as well as propagation prediction software; see the list of Web sites at the end of this chapter. Beacon clocks help in identifying which international high-frequency beacon is on the air at a particular time; see Fig. 13-1, which illustrates the location of the international HF Beacon stations around the world. Propagation software will assist you in predicting a possible usable path between you and a particular country or beacon location.
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USE AS A BEACON 173
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Figure 13-1 International beacon clock stations.
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The Northern California DX Foundation (NCDXF), in cooperation with the International Amateur Radio Union (IARU), constructed and operates a worldwide network of high-frequency radio beacons on 14.100, 18.110, 21.150, 24.930, and 28.200 MHz. These beacons help both amateur and commercial high-frequency radio users assess the current condition of the ionosphere. The entire system is designed, built, and operated by volunteers at no cost except for the actual price of hardware components; see the beacon timing chart in Table 13-1. The NCDXF/IARU International Beacon Network provides reliable signals on the air, around the clock, from fixed locations worldwide. With 3 minutes of listening for the beacons, one can find out either where a particular band is open or which band has the best propagation to a particular part of the world. In principle, one can simply listen on the beacon frequencies and copy the CW call signs of the various beacons to figure out where the band is open, but in practice, not every ham operator can copy calls at 22 words per minute and some beacons may be heard at too low a signal strength to catch the call. Because the beacons transmit at known times, it is easy to know which beacon one is hearing without actually copying the CW call sign. Since the beacons are running 100 W to a vertical antenna, even a weak beacon signal may indicate a path with excellent propagation for stations using higher power and directive antennas. In order to know which beacon is transmitting at any particular time, you can either refer to the beacon transmission schedule or use your computer and one of the beacon clock programs. If you want to know where to point your antenna or decide which beacons are the most interesting to you, you can refer to the beacon locations. If you have a computer and
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HF BEACON SCHEDULE* FREQUENCY, MEGAHERTZ
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CALL SIGN
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UN Canada U.S.A. Hawaii New Zealand Australia Japan Russia China Sri Lanka South Africa Kenya Israel Finland Madeira Argentina Peru Venezuela
4U1UN VE8AT W6WX KH6WO ZL6B VK6RBP JA2IGY open open 4S7B ZS6DN 5Z4B 4X6TU OH2B CS3B LU4AA OA4B YV5B
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