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a computer-compatible radio and would like a record of when various beacons can be heard at your QTH, you will want to learn about automated beacon monitoring. The beacons come on the air with 100 W, sign the beacon call sign, and then step down to each of four power levels, 100, 10, 1, and 0.1 watt, and finally back to 100 W for the sign-off call. Each power level would last about 10 seconds before automatically switching to the next level. The total number of beacons in the network is presently 18. The entire beacon network allows a listener to hear beacons from all parts of the world on a given frequency in a 3-minute period. Alternatively, the listener can follow a single beacon through the bands and determine the best band open to that area. Radio beacons are very popular with VHF/UHF amateur radio operators around the world. Since VHF/UHF frequencies are usually limited to shorter ranges than HF frequencies, there are many more regional VHF/UHF beacons set up by private individuals around the world. The radio fox/beacon is ideal for VHF/UHF for determining band open-
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USE AS A BEACON 175
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'FOX10.BS2 'by G Crenshaw 'WD4BIS 'Constants tone con 1200 dit_con 100 dah_con 300 'Program start: gosub key PTT gosub dit gosub dah gosub dah pause dah gosub dah gosub dit gosub dit pause dah gosub dit gosub dit gosub dit gosub dit gosub dah pause dah gosub dah gosub dit gosub dit gosub dit pause dah gosub dit gosub dit pause dah gosub dit gosub dit gosub dit pause dah gosub bubbleup freqout 1,60000,100000 gosub bubbledown tone gosub unkey PTT pause 60000 goto start 'Subroutines dah: freqout 1,dah_,tone Pause dit_ return dit: Freqout 1,dit_,tone Pause dit_ return key PTT: High 0 Low 3
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'1200 hz tone for Morse ID 'Time in ms for Dit subroutine 'Time in ms for Dah subroutine
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'Key the transmitter 'Send W
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'Send S
'Bubble up tone 'Send a 1000hz tone for 60 seconds out I/O pin 1 'Bubble down tone 'Unkeys transmitter 'Wait 60 seconds 'Returns to beginning of program 'Dah subroutine
'Dit subroutine
'Key xmtr,takes I/O pin 0 high,takes I/O pin 3 low 'Take P0 high 'Takes P3 low
Listing 13-1 Fox/beacon program.
176 AMATEUR RADIO FOX/BEACON PROJECT
pause 30000 Pause .3 second to give xmtr time to key return unkey PTT: 'Drop xmtr returns I/O pin 1 and 3 to original state low 0 'Take P0 low high 3 'Take P3 high return Bubbleup: 'Bubbleup tone Freqout 1,dit_,500 Freqout 1,dit_,600 Freqout 1,dit_,700 Freqout 1,dit_,800
return Bubbledown: Freqout 1,dah_,800 Freqout 1,dah_,700 Freqout 1,dah_,600 Freqout 1,dah_,500 return
'Bubbledown tone
Listing 13-1 Fox/beacon program (Continued).
ings and propagation studies. Space does not permit listing all of the VHF/UHF beacons, but Table 13-2 lists the new band plans for beacon frequencies on the VHF/UHF bands. The new Beacon-Net system allows VHF/UHF ham radio operators to study propagation between two specific stations and will alert the hams at each when a path is available and working.
Description of the Project
The radio fox is built around the STAMP 2 microprocessor. In this project we use the original STAMP 2, but you could easily substitute the alternative STAMP 2 by translating the input/output pin numbers. The radio fox first keys the amateur. The STAMP 2 then sends out an audio alert tone and then your ham radio call letters. Nonhams can have STAMP 2 send a tone sequence and then Morse code representation of the name of a person, club, etc. The fox sends a 1000-Hz tone for about a minute and then unkeys the radio and rests for 1 minute. It then repeats the cycle over and over. The dit and dah routines in the program (see Listing 13-1) will of course have to be edited to send your own call sign. The radio fox is built around the original BASIC STAMP 2 as shown in Fig. 13-2. You can build your fox on a perfboard with point-to-point wiring, use the BASIC STAMP 2 carrier board, or build a small circuit board for the circuit. It is advisable to use an integrated circuit socket for the BASIC STAMP 2 rather than solder the microprocessor directly to the circuit board, in the rare event the microprocessor fails. When constructing the fox, be sure to observe the correct polarity of the capacitors when installing them. The
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