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Installing the Antenna Cable
You should install the antenna cable from the transient eliminator to the
TimeProvider 100 using the shortest route possible. Follow all applicable building
and electrical codes to ensure a water-tight and fire-resistant installation.
Caution: To avoid damage to the connectors, do not use the
connectors to pull the cable. If at all possible, avoid bundling the
cable with other cables (and possible noise sources). Use appropriate
cable-pulling devices when pulling the cable through conduit or a
weather head.
Connecting the GPS Antenna
Before connecting the GPS antenna to the TimeProvider 100, see
Connection
Overview, on page 112. Then, follow the instructions below.
1. Before connecting the antenna coaxial cable to the TimeProvider 100, test the
DC resistance between the center conductor and the shield using an ohmmeter.
The reading should be approximately 260 for an active GPS antenna.
If the actual reading is incorrect, you may have a shorted or open cable or transient
eliminator (if installed). Therefore, apply the same measurements directly to the
GPS antenna. This requires disconnecting the antenna cable at the antenna.
Note: The open-circuit range of an individual ohmmeter can cause
readings to vary among meters.
2. Secure the free end of the antenna cable to the appropriate antenna connector
on the rear panel of the TimeProvider 100 using the right angle adapter provided
with the antenna cable.
Recommendation: Symmetricom recommends coiling excess cable
to avoid gain mismatch between the GPS antenna and the
TimeProvider 100. Coiling the excess cable also allows you to use the
factory-installed crimped connector.
Antenna Installation Completeness Checklist
To verify that antenna installation is complete:
Verify that all power and ground wires are installed correctly and securely
fastened.
Verify that all input and output cables are properly installed.
Verify that all antenna connectors are secure, tight, and weatherproofed.
098-00106-000 Revision A – March, 2009
Chapter C Installing the GPS Antenna
Installing Antennas
Antenna
TimeProvider 100 User's Guide 119
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