User's Manual Part 2

Simulcast Hardware Installation Installing the TRAK 9100 Simulcast Site Reference
Table 5-18 Operating Specifications for the Tower Top Amplifier
Installing the TRAK 9100 Simulcast Site Reference
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Th
e TRAK 9100 provides a composite 5 Mpps and 1 pps signal used for timing at a remote site. This
section describes how the TRAK 9100 simulcast site reference is installed at a remote site.
Overview of the TRAK 9100 Simulcast Site Reference
As
imulcast system uses signals from the Navstar Global Positioning Satellite (GPS) system to
synchronize the audio from multiple transmitters. A GPS receiver needs to receive the 1 pps signal
from at least four satellites before it can establish its exact geographical location.
The TRAK 9100 uses the satellite signal to derive a high-precision 1 pps signal used in the simulcast
s
ystem for time launching. By launching signals at exactly the same time from multiple sites, destructive
interference of the transmitted signals in overlap areas is minimized. In addition to controlling the
launch, the use of GPS allows for variance in delay of the distribution network (T1/E1).
The TRAK 9100 simulcast site reference provides 1 pps and 5 Mpps reference signals
f
or the following components at a remote site:
• Base radios
• Remote site channel bank
•
Remote site hub
F
igure 5-9 shows the modules and connections on the front view of the simulcast site reference.
68P81003Y71-O November 2002 5-25