User Manual

Preinstallation RF-Orchestra!™ Transmitter Installation and Operation
3-12 6880493G02-C July 2000
Table 3-3 provides a color coding scheme for identifying the antenna feed lines for a typical
cabinet.
Antenna Surge Arrestors
All antenna feed lines should terminate with a suitable surge arrestor within 12 in. inside of
the entry window. Each arrestor must connect to the master ground bar located below the
entry plate.
GPS Antenna Planning
The GPS receiver permits all sites in the system to synchronize to a common timing reference.
Because this timing is critical for maintaining system synchronization, the site planner must
carefully evaluate proposed antenna locations before installation to ensure that an adequate
lock can be obtained from the proposed site.
GPS Antenna Evaluation
The RF-B! transmitter controller, mounted within the cabinet, must locate and track at least
four satellites during initial power-up. The internal GPS receiver, or the interface with a
remote GPS receiver within the RF-B! transmitter controller, is responsible for locating and
tracking the satellites. These four satellites establish a three-dimensional fix (latitude,
longitude, and altitude) for the site. This process can take up to 25 minutes to complete after
power up of the RF-B! transmitter controller.
Once the position requirements from the GPS receiver and system engineering of the site are
established, the corresponding data (almanac) is stored in memory, and normal operation
resumes. Although four satellites must be tracked initially, only one satellite is necessary to
maintain the timing signal.
Table 3-3: Example of Antenna Identification Tape Marking
Color Description
Red RF-O! transmitter transmit antenna
Blue RF-A! receiver receive antenna 1
Green RF-A! receiver receive antenna 2
Yellow Global Positioning System (GPS) antenna