098-00564-000 Revision A3 – July, 2013 TimeProvider 2300/2700 User’s Guide 329
Appendix C Installing GNSS Antennas
GNSS Antenna Installation
Extra cable ties or acceptable cable clamps
#6 AWG (16 mm
2
) copper ground wire (minimum)
Eight-foot (2.9 m) ground electrode
Custom mounting plates, U-bolts, PVC pipes, masonry bolt, etc. as needed for
mounting to a tower, roof, or wall of a building
A cable puller may be required for installing the antenna coaxial cable
Digital multivoltmeter (DVM)
Cutting Antenna Cables
Symmetricom recommends that you coil excess cable to avoid gain mismatch
between the GNSS antenna and the GNSS receiver. Coiling the excess cable also
allows you to use the factory-installed crimped connector.
Symmetricom does not recommend cutting the antenna cables provided in the
GNSS Antenna Kits. If you must cut the cables, please ensure that the following
requirements are met.
Cable Requirements – The total cable length from the GNSS receiver to the
antenna must not be shorter than the minimum cable lengths indicated in the GNSS
Antenna Kits (see Table C-1).
Connector Requirements – The cables provided with the GNSS antenna kit have
factory installed crimped connectors. If you cut these cables, you must supply and
add a connector. Symmetricom recommends that you use only crimp-style N-type
connectors in the crimper kit for this application (see Table C-2).
Installing the Antenna
This section provides procedures for installing the GNSS antenna (see Figure C-2).
1. Insert the antenna into the right-angle mounting bracket and tighten it using the
antenna nuts.
2. Mount the right-angle bracket to the mast using for example, U-bolts.
3. To secure the coaxial cable to the mast, use 8-inch cable ties or appropriate
cable clamps.
Caution: To avoid damage to the connectors, do not use the
connectors to pull the cable. If at all possible, avoid bundling the
coaxial cable with other cables (and possible noise sources). Use
appropriate cable-pulling devices when pulling the coaxial cable
through conduit or a weather head.
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