2.1.3 Radio transmission
Deploy the WEATHERPAK M as close as safety permits to the hot zone. The WEATHERPAK M
UHF radio has a range of 5 to 7 miles line-of-sight. The spread-spectrum radio has a range of 1 to
2 miles.
CAUTION:
Do not attempt to transmit through structures containing steel, or through hills.
2.1.4 GPS operation
The WEATHERPAK M wind sensor includes an integrated GPS receiver with internal antenna. The
GPS receiver provides elevation data, which is used to calibrate the internal barometer as well as
location information used by the display. The display then uses the location data to calculate the
distance and bearing between the WEATHERPAK M station and the display.
The performance of a GPS receiver at power-up is determined largely by the availability and
accuracy of the satellite ephemeris data and the availability of a GPS system almanac. When the
WEATHERPAK M is powered up, the GPS searches for satellites from a cold start (no almanac).
The GPS will begin to compute position solutions within the first two minutes.
NOTE:
Immediately power up the WEATHERPAK M system as soon as you arrive on site to allow the
GPS to find the satellite and computer position.
2.2 System assembly
2.2.1
WEATHERPAK M
display connections
The
WEATHERPAK M
display contains an integrated UHF or spread-spectrum radio, and is
designed to work in conjunction with one or more WEATHERPAK M stations. The radio antenna
receives the signal from the WEATHERPAK M using narrow-band UHF or spread spectrum. In
addition, a GPS antenna and electronics allow the WEATHERPAK M location to be shown in
relation to the display location.
1. Connect the external GPS and radio antennas to the appropriate connectors on the side of
the
WEATHERPAK M
display (see
WEATHERPAK M
4
