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Article: Finding a Break in the Boundary Wire


To locate wire breaks in your loop installation, a wire break location device called an RF-Choke is available at Radio Shack (Catalog #273-102C; Figure A). Once you have this device, follow these procedures:

1. Disconnect power by unplugging the adapter from the outlet.
2. Disconnect the boundary loop wires from the wire clips on the transmitter.
3. Bend the leads of the RF-Choke into the shape of a horseshoe.
4. Gently wrap the boundary loop wire tips around the RF-Choke leads (one to each side - see figure B).
5. Plug the RF-Choke leads into wire clips on the transmitter.
6. Plug the adapter into the outlet.
7. Set a portable AM radio to AM-60 or AM-600. If a radio station is at that location, simply turn the radio dial until you hear static.
8. Set the field width knob high enough to obtain a signal on the portable radio.
9. Stand outside the structure where the double-twisted wire exits the building and listen for the pulsating static on the radio. The signal should be absent until you reach a single wire on your boundary.
10. Hold the radio chest high and swing the radio over the wire as you walk around the boundary.
11. If the tone weakens, stop and mark the spot with a flag or stick. If there is no sound, the wire has a complete break. If there is a fading or change in pitch, then a nick in the insulation is present. NOTE: The signal will be absent when standing on the twisted wire area because the signal was cancelled.
12. Continue around the remaining boundary and mark each signal change with a flag or stick.
13. After completing the entire boundary, return to the marked spots. Examine the wire for 3-4 feet in each direction.
14. Replace the wire using the same gauge wire used in the original installation and use waterproof splices to make the connection.

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