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WWN Range Test Map - test done July 2001 in Chico, CA



The topographic map of California's Sacramento Valley above shows the location of the range test performed with the WWN system. Each of the pin markers shown above indicates the line of sight distance from the base weather station to the roaming receiver.


Items used in the Range Test:


  • WWN Complete Weather Station with Davis Weather Monitor II EZ-Mount station, WeatherLink RS232 data logger/interface, and the assembly was equipped with the WWN Solar Powered Transmitter and Yagi 4 element UHF beam antenna
  • WWN Receiver Station with Solar Powered Receiver equipped with Yagi 4 element UHF beam antenna
  • Gateway Laptop Computer with Windows 2000, and Standard RS232 Serial Port
  • WeatherView32 remote Weather Station Software
  • Optional "Rubber Duck" flexible UHF antenna
  • Printed Topographic Map similar to above
  • Magnetic compass


(Mobile Vehicle)

(Weather Station)

Two Way Spread Spectrum
900 Mhz Radio Modem


Procedure Used in the Range Test:

First we chose a spot for the weather station along Highway 32 East of Chico where we could get some elevation above the tree line. Then, all we did was to choose some spots on the map where our mobile roaming receiver (WeatherShop President Anthony Watts in his Dodge Durango) could pull over safely and pull the tripod and receiver antenna out and point it in the direction of the Weather Station. In all cases, nothing more than a compass was used to align the receiving antenna in the right direction, and we found that the antennas were "quite forgiving" in their alignment.


To test the data transmission we used WeatherView 32 installed on the GateWay laptop. We connected the receiver's RS232 serial port to the COM1 serial port of the Laptop, and simply activated WeatherView32. WeatherView32 would attempt to connect to the Davis Weather Monitor II (at the transmitter site) by sending out a data query, and the Weather Monitor II's data logger (the WeatherLink module) would send out a data burst identifying itself. Once that was accomplished, reliable two-way data transmission was established between the weather station and the WeatherView32 application on the Laptop.


The data transmission was so reliable that we found that in two of the locations, we could remove the Yagi beam antenna on the mobile receiver, and use the UHF flexible "rubber duck" antenna!


Range Test Table

Location Distance Reception with Yagi Reception with "Rubber Duck"
Site 1 10.4 miles  Yes Yes
Site 2 17.6 miles  Yes No
Site 3 24.4 miles  Yes No
Site 4 32.0 miles  Yes Yes



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