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TX RX ATN GND P0 P1 P2 P3 P4 P5 P6 P7 VCC 24 23 22 21 20 19 18 17 16 15 14 13
BASIC STAMP 2
GND RST 5V P15
S2 Reset N/O
9 Pin P2 N/C R1
P14 P13 P12 P11 P10 P9 P8
7 8 9 10 11
GND PTT
N/O 5V relay C2 0.1 F
0.1 F Audio C1
Figure 13-2 Main fox/beacon schematic.
audio output pin at pin 6 or (P1) is used to feed audio to your transmitter s microphone input connector. A capacitor is fed in series to the audio line of your transmitter, while a 0.1- F capacitor is connected across the microphone pins. A relay is used to key the transmitter and is used to isolate ground between the fox and your transmitter. The PTT control line from pin 5 (or P0) is used to key the 5-V minirelay, which is used to key your radio
178 AMATEUR RADIO FOX/BEACON PROJECT
on and off. The minirelay is a RadioShack 30-mA coil relay. The normally open contacts of the relay are used for this project. A reset switch is connected between RST pin 22 and ground. The reset switch could be a normally open pushbutton switch PC-board-mounted switch if desired. The reset switch is used in the event the processor locks up and can be used to restart the STAMP 2. Power for the fox is supplied to pin 24 (VCC). A 12-V gel-cell rechargeable battery can be used to power the circuit. The ampere-hour capacity of the battery used depends on the power output of the transmitter used. A 2- to 7-A-h battery is recommended. A power charge connector can be installed on the fox enclosure, in order to recharge the gel-cell. The first four pins of the STAMP 2 are used for programming. Pin 1 is the TX pin, while pin 2 is the RX pin. Pin 3 is the ATN pin, and ground is shown at pin 4. The four pins can be connected to a 4-pin male header, or to a connector on the side of the plastic enclosure. The programming connector is then wired via 4-conductor telephone wire. A 9-pin female RS-232 connector is used to interface to a PC for programming. The diagram in Fig. 13-3 illustrates the fox connected to a battery and a suitable transmitter or transceiver via the microphone connector. The fox can be installed in an ammo can, which is sealed from moisture. A BNC connector can be installed on the side of the ammo can, and a rubber duck antenna can then be connected to the fox. A locking hasp and padlock can be added to keep the equipment from being stolen. You can add a piece of chain and chain the fox to a tree. You can also add a small clipboard with 3- by 5-in cards, each with a printed number. As fox hunters find the fox, they take a numbered card from the clipboard so they can claim their place in the sequence of fox finders. It is also a good idea to make up a sheet with your name, phone number, and call sign, and a brief description of what the box does. Then laminate the sheet and affix it to the side of the ammo box. In the event it is found by an unsuspecting person, the local bomb squad will not be called in to investigate. If you choose to build the fox/beacon project as a beacon transmitter, you may wish to house the project differently. You may want to build the fox/beacon circuit and interface in an extruded aluminum chassis box that can be placed near an HF or VHF/UHF transceiver for table-top operation in a separate corner of your radio room. The fox is now almost completed. Next you will have to program the STAMP 2. First locate the Fox STAMP 2 Windows editor program titled STAMPW.BS2. Next you will need to connect up your programming cable, apply power to the circuit, find the fox program labeled FOX10.BS2, simply change the text in the program to reflect your own call, save the program, and you re ready to go. Your radio fox is now ready go have some fun!
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