Bird Technologies 429-83H-01 Series-Manual - Manual (Page 16)

TX RX Systems Inc. Manual 7-9439-6 09/03/09 Page 8
INSTALLATION
The following sub-sections of the manual discuss
general considerations for installing the system. All
work should be performed by qualified personal.
TXRX Systems provides the base MCU, tower top
amplifier box, and the mainline lightning arrester.
All additional parts 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 unit for
future reference (table 4 is a convenient place to
record them). The numbers are located on a tag
attached to the inside of the door and maybe
required in the future if you call the factory for cus-
tomer support.
Base to Tower-Top Communications
A special lightning arrester (TXRX part # 8-21550)
is provided with this TTA for installation at the main
transmission line entry bulkhead/grounding plate.
This unit not only passes the DC current required
to operate the TTA, but also generates the low fre-
quency subcarrier used for the standard AISG/EIA-
485 data communications between the base unit
and the tower top box. A standard CAT-5e data
cable (double shielded) must be installed between
the base unit (MCU) and the lightning arrester for
carriage of the EIA-485 data. The TTA will operate
normally with all backup functionality intact if this
data cable is not installed, is damaged or removed,
but status and alarms will not be available at the
base.
Minimum length cables
Best possible sensitivity
Default "TTA NET GAIN" Attenuation (3.0 dB)
Default Distribution Attenuation (1.0 dB)
Signal Generator
MCU
Front
Panel
Test
Port
Tower Top Box
Lightning Arrester
TX RX part no. 8-21550
12 dB SINAD Receiver
CAT-5e
Cable
Diagnostic Cable
Test Ant Main
Figure 8: Test equipment interconnection for “bench testing” of system components.
Connection to an appropriate power source is assumed.