4. Place the template on top of the intersecting centerlines. Center the antenna template — within
2 in (5.1 cm) of track centerline — on the line that is parallel to the rails, then align it with the line
drawn perpendicular to the rails (within 15 degrees).
5. If the track bed is out of specification from the measurements provided in Step
grout the track bed base with up to 0.5 in (1.3 cm) of grout replacement to bring it to specification.
Allow sufficient time for the grout to cure before proceeding to the next step. Redraw the track bed
centerlines if necessary.
Note:
If track bed cannot be brought into the specification stated in Step
, change antenna
location.
6. When the track bed base is within the requirements of Step
, stretch the template across any
“valley” (as shown in
) to get the proper center-to-center spacing between the foot blocks.
Use the template to mark and drill six 0.375 in (0.95 cm) wide x 3 in (7.6 cm) deep holes in the
concrete. Check that the template centerlines are aligned with the track bed centerlines (see Step
of this section).
7. Clear the concrete dust from the wedge anchor holes.
Securing Antenna Hardware Connections
After you have prepared the site as specified in
secure the hardware connections.
1. Place the antenna upside down on its cover (radome facing down) on top of the template to
protect the cover from being scratched.
Figure 3 Test Configuration for Antenna Installation
AA-3233 Subway Rail Antenna
8
