12713020-003-2 Revision F.01 – January 2007 SSU-2000 Technical Reference 285
Chapter 5 Antennas
Installing Antennas
Installing the Antenna Cable
You should install the antenna cable from the transient eliminator to the SSU-2000
using the shortest route possible. Follow all applicable building and electrical codes
to ensure a water-tight and fire-resistant installation. .
Connecting the GPS Antenna
Before connecting the GPS antenna to the SSU-2000, see Antenna Connection
Overview, on page 278. Then, follow the instructions below.
1. Before connecting the antenna coaxial cable to the SSU-2000, test the DC
resistance between the center conductor and the shield using an ohmmeter. The
reading should be approximately 260 Ω 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.
2. Secure the free end of the antenna cable to the appropriate antenna connector
on the rear panel of the SSU-2000 using the right angle adapter provided with the
antenna cable.
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.
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.
Note: The open-circuit range of an individual ohmmeter can cause
readings to vary among meters.
Recommendation: Symmetricom recommends coiling excess cable
to avoid gain mismatch between the GPS antenna and the
SSU-2000. Coiling the excess cable also allows you to use the
factory-installed crimped connector.
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