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Trimble R7/R8 GPS Receiver User Guide 97
Cables and Connectors 10
Trimble R7 Operation
10.5 GPS Antennas and Cables
The antenna that a receiver uses to collect satellite signals is
sometimes called a GPS antenna to distinguish it from a radio antenna.
Radio antennas are used for communication between receivers and
external networks or systems.
Note – Older models of antennas, such as Choke Ring or
Micro-Centered L1/L2, have different power requirements. The
Trimble R7 can adjust the antenna power output when you designate
the appropriate antenna in GPS Configurator. For more information,
see Antennas, page 35.
Connect the receiver to its GPS antenna using the yellow TNC
connector. Use a coaxial cable with a right-angle TNC plug at the
antenna end.
If the antenna cable length is … use …
up to 15 meters (45 feet) RG-58 cable
up to 30 meters (100 feet) RG-214 cable
over 30 meters (100 feet) one of the following:
• in-line amplifier
• semi-rigid coaxial cable
• a low-loss cable assembly