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Manual 7-9547-1 12/09/14 Page 17
required for installation must be supplied by the
customer. Before mounting the tower top box we
recommend that you record the model number and
serial number of the tower top box and control unit
for future reference in the event you need to call the
factory for customer service support.
Proper installation of this system
requires the installation of a test trans-
mission line in addition to the main
transmission line for system testing
and diagnostics.
Installing the System
Installation of the TTA system should follow the
installation standards listed in
Figure 9, and 10
.
Installation and grounding of the system should fol-
low the R56 standards. Lightning surge suppres-
sors are incorporated throughout the system. In
addition, surge suppression is also provided for all
cable connections within the tower top box. Proper
grounding techniques MUST BE observed for
these devices to perform properly.
Installing the Tower Top Unit
The tower top box has mounting tabs on the back
of the unit to allow for fastening to the tower, refer
to
Figure 11
. Because of the varied tower types,
the customer must fabricate the interface brackets
between the tower frame and the unit. Bird Tech-
nologies offers an optional TTA mounting bracket
kit (part # 91-00-123). The kit allows for easy instal-
lation of tower top units to poles about 3 inches in
diameter. To install the tower top unit perform the
following steps.
1) Mount a receiving antenna on the tower.
2) Run the main transmission cable and test cable
up the tower.
3) Mount the tower top unit on the tower at a loca-
tion near the antenna and connect the antenna
feedline, main transmission line, and test line to
the unit.
4) Connect the tower top box ground lug to a good
solid ground on the tower.
To insure stability, it is important to
fasten the box to the tower using all
mounting tabs. The box must be
mounted with the connectors and
moisture openings facing
downward
to prevent water entry. After connect-
ing the main transmission line, test
line, and the antenna feedline, we rec-
ommend that the connections be
tightly wrapped with rubber splicing
tape (see
Figure 12
). This will help
prevent water entry into the cables.
Start the wraps on the cable several
inches away from the connector and
wrap
towards
the connector, this will
p r e v e n t w a t e r f r o m s e e p i n g i n
between the wraps of tape. Cover the
connectors completely with tape.
In-building Lightning Arresters
Lightning arresters must be installed in the equip-
ment room one each for the main and test trans-
mission lines. The following steps are required for
proper installation.
1) For the test line install a lightning arrester.
PolyPhaser part# 1090501WA (male/female) or
1090501WD (female/female). The chassis of
the arrester should be connected to the master
ground buss with a pigtail.
2) For the main transmission line install a lightning
arrester. PolyPhaser part# 1090501WA (male/
female) or 1090501WD (female/female). The
chassis of the arrester should be connected to
the master ground buss with a pigtail.
Installing the Base Control Unit (MCU)
The base control unit is designed for indoor mount-
ing in a common 19-inch relay rack or cabinet. The
following steps are required for proper installation.
1) Install the base control unit into the rack or cab-
inet with four mounting screws included with the
hardware kit (part # 3-16509) which is included
with your shipment. Make sure you use a nylon
washer under the head of the screws in order to
protect the front panel. Torque the mounting
screws to no more than 15 in/lbs. Overtighten-
ing the mounting screws may damage the front
panel.
NOTE
NOTE
