Trimble Inc. 10950 Manual De Usuario
30
Alloy GNSS reference receiver User Guide
•
Clear sky from the zenith to the horizon to a 100 m (328 feet) radius, in all directions (360
degrees).
degrees).
•
Mounted 1.5 m (5 feet) above any nearby signal reflectors.
•
Separation of at least 300 m (984 feet) from radio signal transmitters.
•
Mount stability that is not influenced by thermal expansion, wind loading, or soil
expansion/contraction.
expansion/contraction.
For additional information on this topic, research the reference antenna installation guidelines
published by:
published by:
•
the US National Geodetic Survey
(
(
http://www.ngs.noaa.gov/PUBS_LIB/CORS_guidelines.pdf
)
•
the International GNSS Service
(
(
http://igscb.jpl.nasa.gov/network/guidelines/guidelines.html
)
Connecting the receiver to external devices
You can connect a Alloy receiver to the following devices:
•
GNSS antenna
•
Dial-up modems
•
Radio modems
•
Meteorological and tilt sensors
GNSS Antenna
The Alloy receiver provides a TNC-type female connector for connecting to an antenna. The
receiver is intended for use with a Zephyr™ Geodetic Model 2 antenna or a Trimble GNSS Choke
Ring antenna.
Antenna Cabling
Many permanent GPS installations have unique cabling requirements. Depending on the available
infrastructure, you may need to mount the antenna a substantial distance from the receiver.
The Alloy receiver can withstand a loss of 12 dB between the antenna and the receiver. The degree
of loss in a coaxial cable depends on the frequency of the signal passing through it. The following
table lists some common types of cable and the maximum length you can use before you need an
inline amplifier.
infrastructure, you may need to mount the antenna a substantial distance from the receiver.
The Alloy receiver can withstand a loss of 12 dB between the antenna and the receiver. The degree
of loss in a coaxial cable depends on the frequency of the signal passing through it. The following
table lists some common types of cable and the maximum length you can use before you need an
inline amplifier.