Antennas
Optional Accessories
406 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
Connecting the GPS Antenna
Before connecting the GPS antenna to the SSU-2000, see GPS Antenna
Installation Procedures, on page 401. Then, follow the instructions below.
1. Before connecting the antenna coaxial cable to the radio receiver, test the DC
resistance between the center conductor and the shield using an ohmmeter. The
reading should be between 1000 Ω and 40 MΩ 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 antenna connector 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.
Verify that all input and output cables are properly installed.
Verify that all antenna connectors are secure, tight, and weatherproofed.
Optional Accessories
Table C-12 provides a list of optional accessories which may be used to mount or
install the SSU-2000.
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 radio
receiver. Coiling the excess cable also allows you to use the
factory-installed crimped connector.
Table C-12. Optional Accessories
Part Number Description
00413102-001-1 Bracket, rack ear, 23”, 2 each required (not included with unit)
22013085-000-0 9 pin-D wire-wrap adapter (not included with unit)
551026-0038 Cable EIA-232 shielded DB9P to DB9S, 5 ft. (1.5 m)
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