User Manual

3-24 Configuring, Installing, and Using Base Stations
flexible line, of the shortest length possible, while still allowing the flexibility to
make a good connection.
• The base station contains an antenna connector with a 1/4 inch wave stub
lightning protector. You do not need to place an external lightning protector in
the coaxial cable.
Connecting the antenna to the base station
To attach the antenna to the base station:
1 Mount the antenna according to the manufacturer’s instructions.
2 Connect one end of a short coaxial jumper to the antenna. Connect the other
jumper end to the main coaxial cable.
3 On the base station’s antenna connector, connect one end of a short coaxial
jumper. Connect the other jumper end to the main coaxial cable coming from
the antenna.
4 Make sure the coaxial line is properly grounded.
5 Properly seal the co-axial connections with weatherproof components, tape and
wrap.
Connecting the GPS equipment to a base station
The GPS equipment provides a time synchronization signal to the base station.
This signal is needed to ascertain the proper timing for time division duplexing
(TDD).
The equipment — supplied by NextNet and manufactured by Trimble Navigation
Limited — is a smart antenna in a sealed, shielded, self-contained unit that houses
a GPS receiver, GPS antenna, and interface circuitry. A lightning protector is also
supplied.
When powered, the GPS provides accurate time, with a time pulse of one pulse per
second, synchronized to Universal Time, Coordinated (UTC) within 150
nanoseconds.
GPS equipment mounting tips
You must use the supplied Trimble GPS system to supply a time synchronization
signal to the base stations in a cell. You cannot use a GPS from another
manufacturer.