TransCore 05716 Manuel D’Utilisation
Developing the Site Plan
2-9
The antenna mounting location, aiming, and range control adjustment, and use of
presence detectors can reduce interference from RF reflections. When these actions
cannot adequately control reflections, other techniques such as shielding, absorbing,
range sensitivity adjustment, or barriers can also be used. See Chapter
presence detectors can reduce interference from RF reflections. When these actions
cannot adequately control reflections, other techniques such as shielding, absorbing,
range sensitivity adjustment, or barriers can also be used. See Chapter
for more information.
Existing Interference
Interference from RF and electrical sources can degrade system performance and must
also be considered in the site design. Fluorescent lights, neon signs, nearby radio sta-
tions, or power lines can interfere with the optimal operation of the system. The mag-
netic impulse noise from relays that control gate opening and closing can also disrupt
the RF signal.
also be considered in the site design. Fluorescent lights, neon signs, nearby radio sta-
tions, or power lines can interfere with the optimal operation of the system. The mag-
netic impulse noise from relays that control gate opening and closing can also disrupt
the RF signal.
Interference may degrade both reader and tag performance. Existing interference at
the site may be shielded, removed, or positioned further from the antenna. In some
cases, changing the operating frequency of the MPRR may provide a simple solution.
Readers in proximity should have at least a 2 MHz frequency separation. See
the site may be shielded, removed, or positioned further from the antenna. In some
cases, changing the operating frequency of the MPRR may provide a simple solution.
Readers in proximity should have at least a 2 MHz frequency separation. See
Strong RF sources of any frequency, in proximity to
the tag, can preclude the tag receiving the reader interrogation.
See Chapter
“Trou-
bleshooting and Maintenance.”
Electrical and Communications Requirements
All construction work at the site must be completed before installing the MPRR. Elec-
trical and communications cables should be installed according to all applicable local
and federal building code requirements. Specific instructions for positioning and
installing the MPRR are discussed in Chapter
trical and communications cables should be installed according to all applicable local
and federal building code requirements. Specific instructions for positioning and
installing the MPRR are discussed in Chapter
4, “Installing the MPRR.
”
Junction Box
Use a watertight junction box that meets applicable local and national building codes
for connecting power and communications wiring. The junction box houses the termi-
nal strip for power and communications connections. TransCore recommends a
NEMA Type-4 junction box with a back mounting panel.
for connecting power and communications wiring. The junction box houses the termi-
nal strip for power and communications connections. TransCore recommends a
NEMA Type-4 junction box with a back mounting panel.
Power and Communications Cables
Cable length for power and communications depends on the physical characteristics
of the MPRR installation site.
of the MPRR installation site.
lists accessory kits available for cabling
options based on your site’s requirements.