User's Manual

Road Loop Antenna Installation
© 2001, AXCESS Inc. 750.001.004 R0033 59
Each combination of loop-width, loop-length and wraps of
wire will produce a specific antenna inductance ( mea-
sured in Microhenrys) – providing maximum power to the
antenna. But, more wraps than recommended will NOT
produce more range; rather, it will degrade performance!
The “Inductance” column in the chart is included only for
those installers having an inductance meter. If you do not
have an inductance meter, that column is of no value.
Step 10:
After the correct number of loops (see above) have been
completed, continue to lead the wire back to the Activator.
Again, keep twist to a minimum.
Step 11:
Carefully review the installation to this point. If everything
is correct, cut away the excess wire, trim and attach the
other end of the Road Loop wire to the other half of the
binding-post-to-BNC connector (Figure 29).
Road Loop Lead-in
Dual binding post-to-
Male BNC Connector
Figure 29 Post to Male BNC Connector
Step 12:
Cycle the power of the Activator and check the strength of
the TX Output LEDs.
Step 13:
Using an LED Test Tag, ensure that the activation field of
the Road Loop extends adequately for desired coverage
from the center of the Road Loop (Figure 26). Antennas
with greater width (dimension A) have larger fields.
Step 14:
After ensuring proper operation, remove the wire loop and
concrete nails to allow cutting the groove into the roadway.
Installing the Road Loop Antenna (Frequently contracted)
A normal antenna installation should take about two hours using a
walk-behind concrete saw with an abrasive blade to cut asphalt. Two
1/8" blades with a spacer will be required.
The same antenna should take about three hours to cut in concrete
using a diamond cut blade. Two 1/8" blades with a spacer will be
required.
Step 1:
Confirm that the loop is correctly marked on the road
surface.
Step 2:
Lay out the 45-degree corner cuts. It is helpful to create a
template with the dimensions 3¼” x 3¼” x 4½” (Figure 30).