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Chapter 2
2.1.3
Connect the GNSS Antenna
Antenna system selection and installation is crucial to the proper operation of the G-III Reference Receiver.
Before installing the antenna, select a site that meets the following conditions as closely as possible for optimal
performance:
•
The antenna has an unobstructed line-of-sight from horizon to horizon and at all bearings and
elevation angles.
•
The antenna is as far as possible from reflective objects, especially those that are above the
antenna and any water bodies, which can be a strong source of multipath reflections.
•
If obstructions and reflective surfaces are within 30 m, ensure the antenna is as high as possible.
Otherwise, mount the antenna as low as possible.
•
Ensure that the antenna is mounted on a secure, stable structure capable of withstanding relevant
environmental loading forces (e.g., due to wind or ice).
•
Use high-quality coaxial cables to minimize signal attenuation.
•
When using active antennas, remember that you also must connect each low-noise amplifier
(LNA) to a suitable power source. The gain of the LNA must be sufficient to compensate for the
cable losses.
The antenna port (J11) on the G-III Reference Receiver can provide power to the LNA. See
Table 54, Port Specifications on Page 136 for the port power specifications.
If you want to use the G-III Reference Receiver to provide power to the LNA, you must enable
this feature using the ANTENNAPOWER command. See Section 4.4.2, ANTENNAPOWER on
Page 46.
Connect the antenna to the RF1 IN (J11) TNC female connector on the back of the G-III Reference Receiver.
Table 54, Port Specifications on Page 136 provides technical specifications for this port.
See also Section 2.2.5, Access the RF Output on Page 27.
2.1.4
Connect the power supply
Before applying power to the G-III Reference Receiver, ensure that all of the following conditions are met:
•
The external frequency reference is properly installed, connected, powered-up and stabilized.
•
The GNSS antenna is properly installed and connected.
Connect the power cable from the J01 port on the G-III Reference Receiver to a 120/240 VAC 50/60 Hz power
source (e.g. a wall power outlet). Table 54, Port Specifications on Page 136 provides technical specifications
for this port.
Note that the warm-up process may take several minutes, depending on ambient temperature.
When the G-III Reference Receiver has finished starting up, it enters the Configuration state. The State field on
LCD display changes to show the word CONFIGURATION in orange text.
2.1.5
Connect the Ethernet ports
The default settings for the Data port are configured to be compatible with direct connection to the Data
Collection Processor (DCP). To connect the G-III Reference Receiver directly to the DCP, connect an RJ-45
Ethernet crossover cable from the Data port (J02) on the G-III Reference Receiver to an Ethernet port on the
DCP.
If you are using the Monitor port, connect a second RJ-45 Ethernet cable from the Monitor port (J03) on the
G-III Reference Receiver to a computer or a port on the LAN switch. Refer to Table 54, Port Specifications on
Page 136.
24
WAAS G-III Reference Receiver User Manual Rev 1
Installation
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