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Chapter 5 Antennas
Installing Antennas
258
SSU-2000e Technical Reference
12713140-003-2 Revision E.01 – January 2007
Installing the Antenna Cable
You should install the antenna cable from the transient eliminator to the SSU-2000e
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-2000e, see
, on page 251. Then, follow the instructions below.
1. Before connecting the antenna coaxial cable to the SSU-2000e, 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-2000e 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-2000e. Coiling the excess cable also allows you to use the
factory-installed crimped connector.
Содержание SDU-2000e
Страница 10: ...Table of Contents 10 SSU 2000e Technical Reference 12713140 003 2 Revision E 01 January 2007 ...
Страница 242: ...Chapter 4 NTP and SNMP SNMP Protocol 242 SSU 2000e Technical Reference 12713140 003 2 Revision E 01 January 2007 ...
Страница 354: ...Index Z Z 354 SSU 2000e Technical Reference 12713140 003 2 Revision E 01 January 2007 ...