DAVIS CELLULAR TELEPHONE ANTENNA KIT User Manual Page 1

WEATHERLINK RADIO COMMUNICATIONS Application Note 4 WeatherLink for Perception, Wizard, Monitor, GroWeather, Energy and Health EnviroMonitors Introdu

Figure 2. Weather station with YDI radio in a System Shelter WeatherLink Radio Communications 10

Figure 3. Base station UHF radio in a Multi-Purpose Shelter System Shelter. The Complete-system Shelter is designed to provide weather protection for

Spread-Spectrum, 902-928 MHz Radio YDI RM910-DAVIS RF Output Power: 20 mW Current Drawn: 180 mA, 12 VDC, receive and transmit. Order from YDI

Antenna Kit 7652-003: 3 dB omni (6-foot antenna cable) Options 7681: Protector. 7708: Solar Power Kit (requires AOM or Timer). The following shel

RF Neulink 800-233-1728 Model: Neulink 9600 7610 Miramar Road fax: 619-549-6345 450 – 470 MHz San Diego, CA 92126-4202 Cellular Telephones Mo

Lightning Arrestors and Grounding Equipment Harger Lightning Protection, Inc. 800-842-7437 1066 Campus Drive fax: 708-362-3519 Mundelein, IL 600

Current(Amps) ON Time (min./hour) (min./day) DRAIN(Amp-min)A. Station 0.018 60 1440 25.9 B. AOM or Timer 0.012 24 0.3 C. R

Graphs: Transmission Distance and Antenna Gain Figure 4a. Estimated Transmission Distance (Miles, Line-of-sight) vs. Total Antenna Gain. WeatherLink

Figure 4b. Estimated Transmission Distance (kilometers, Line-of-sight) vs. Total Antenna Gain. References 1. NLR Series Technical Notes. Aerotron-Re

Link Channel Description The WeatherLink data channel may be described as follows:  Point-to-point, master-slave. The base station (computer with We

Unlicensed, USA Spread-spectrum. The frequency band of 902 to 928 MHz is available for unlicensed transmission in the U.S. and Canada. Power output mu

The radio modem/transceiver recommended by Davis is the RF Neulink 9600 operating in the 450 to 470 MHz band. Davis supplies two Antenna Kits, each of

Directional Antennas Directional antennas focus their transmitting energy and receiving sensitivity in one direction. This can have two benefits: the

Range Table 2 gives estimated ranges for combinations of Davis-supplied antennas with line-of-sight paths between them. Range estimates for other ante

The Charge Budget table (on page 10) gives a worksheet and an example of a charge budget, used to calculate the daily battery drain for various ON and

the voltage drops below 12.0V, it is suggested that no communication be initiated until there is reason to believe that the station has received charg

Figure 1b. Stations with greater antenna height. System Configurations Figure 1 illustrates two possible radio links. In Figure 1a, the Field Station