User's Manual

4-2 The Tx wand antenna Installation Manual
Single Door Applications
the floor and at least 3 inches away from any
metal doorframe (
Figure 4.3). A 3-inch wood
or plastic spacer may be used to keep the
antenna away from a metal door frame. In
some circumstances due to a building’s
construction, it may be necessary to mount the
antenna on the hinge side of the door.
A single door application (Figure 4.3) usually
requires only one antenna for adequate
coverage.
Double Door Applications
For a double door or hallway application 6
feet or wider (
Figure 4.4), two antennas are
usually required.
Furthermore, never mount any metal electrical
box or run conduit right behind the “ferrite”
bar portion of the antenna (
Figure 4.1).
However, it is acceptable to mount the metal
box so that it is directly behind the circuit
board only.
If you are protecting a double door or hallway,
which is adjacent to a resident’s room, you
should turn down the Tx Activation Field on
the antenna (
see page 4-14) that is nearest the
resident’s room to avoid nuisance activation.
In addition, the antenna should be positioned
within 18 inches maximum of the monitored
door to assure proper coverage. The
recommended distance is from 3 to 6 inches.
Positioning the antenna correctly will help in
avoiding unintended activation of a Tag in a
nearby room or a passerby. The goal is to
produce a Tx Activation Field that adequately
covers the doorway but does not extend into
nearby resident rooms. For more information,
see Tuning a Tx wand antenna on page 4-7.
Figure 4.4 Double Door Placement
Spacing Tx wand antennas
at the Same Zone
It is recommended that the distance between
antennas for a double door or hallway
application should not be greater than 8 feet.
If the opening is greater than 8 feet wide, then
it may be necessary to add a third antenna,
mounted in a horizontal position above the
door or hallway to assure full coverage.
Figure 4.3 Single Door Placement