WeatherHawk Inversion - Wireless - Manual (Page 6)

WeatherHawk ® 3
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1.3.2.1. Transmission Ranges
Site your WeatherHawk within the spread spectrum radio transmission range. Typical line-of-sight (LOS)
transmission ranges are listed below:
•
Standard WeatherHawk Antennas: up to ½ mile (0.8 km)
•
Optional Higher Gain Antennas on Both the Weatherhawk Station and the Base Station: Up to 7
miles
1.3.2.2. Line-of-Sight
Line-of-sight is defined as a straight path between a transmitting and receiving antenna that is unobstructed by
intermediate topography or obstructions (see Figure 2). A clear line-of-sight is required to achieve the optimum
transmission range.
The affect of obstructions on the transmission range can vary. Generally, trees, foliage, metal siding, and metal
roofing absorb or reflect radio frequency—reducing the direct transmission range of a WeatherHawk wireless system.
Wood frame and brick buildings affect the radio frequency less significantly. Sometimes, radio frequencies find an
indirect path by reflecting from the weather station to the base location. However, over-the-horizon sites must use
repeaters or antennas mounted high on a tall mast to get a clear line-of-sight.
Figure 2: Line-of-sight examples. As the dotted line indicates, Station 1 has a clear line-of-sight with the Computer
Site. The mountain obstructs Station 2's line-of-sight and would attenuate the RF signal or prevent the
communications completely. Station 1 can be used as a repeater for Station 2.
If obstructions lie within the line-of-sight, you should test radio transmission range before permanently installing your
WeatherHawk station (see Testing Radio Transmissions below).
The ranges assume no obstructions are in the line-of-sight. Line-of-sight is defined and described below.
Station 1
Station 2