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Today many automatic weather stations are wireless, featuring both an array of sensors and a base station, or console, which is designed to display the readings and log data. The console is usually sited within a home, or office well away from the wind and rain allowing the observer to monitor the weather from a distance. Earlier weather stations such as the Davis Weather Monitor 2 were hard wired to the sensors. Wired installations, although guarantee connection between the sensors and console were not always practical and difficult to install. Wireless Weather stations made installation lot easier but to ensure good reception the console has to be kept within the recommended wireless range of the sensors.
The Davis Vantage Pro 2 and Davis Vantage Vue, according to the manufacture have an optimum range of 300 meters. This is a maximum line of site distance. When you add in additional factors such as thickness of walls, the presences of obstacles between the sensors (ISS) and the Console, interference from other electrical appliances, the wireless range can be significantly reduced or attenuated. Based on experience, the typically installation will result in an attenuation of the wireless range to about 200 meters. Whilst this may suit most installations, some installations require reception over a greater distance. In these circumstances a cabled installation is a possibility but there are other options available.
Factors affecting the wireless range
1. Line of sight distance between transmitter (ISS) and receiver (console).
2. The number, thickness and nature of obstacles between the two.
3. The Height between the ISS and console aerials, Reception works best when both are roughly at the same height.
Increasing the Wireless Range.
Davis short range repeaters feature two products the 7626 which is an AC-Powered version and the 7627, which is a solar variant. Effectively these repeaters received the signal from the ISS and re-transmit it. Each repeater will increase the wireless range by an additional 200-300 meters. Daisy chaining a series of repeaters can increase the wireless range significantly. It is also possible to build a weather station network using the repeaters as each repeat is capable of listening to more than one station.
Long Range Repeaters
The Davis Long Range Repeater, the 7654 is designed to work with the addition of two Antennas, one to receive the data and another to transmit it. Effectively long range repeaters can increase the wireless range between 0.5miles to an incredible 4 miles under optimum conditions. However it must be considered the increase in wireless range is dependant on the type of antenna used, of which there are two types, ether the Omni which transmit and received in all directions and the Yagi which is designed to transmit and receive from a single direction. It is possible to mix and match the antennas to suit your particular needs but an outline of transmission distances is included in the table below.
Maximum Transition Distance under optimal conditions
Dipole – Dipole
0.2 miles (300 meters)
Dipole - Omni
0.3 miles (475 meters)
Dipole - Yagi
0.6 miles (950 meters)
Omni – Omni
0.5 miles (750 meters)
Omni - Yagi
1.0 miles (1500 meters)
Yagi - Yagi
1.9 miles (3000 meters)
Dipole Antennas are found on all Davis wireless weather stations and on standard repeaters.
Davis connect offers a new way to collect weather data from a ISS, and allows data to be connected fr=om remote locations as long as the ISS has good mobile reception. Davis Connect is a self-contained weather resistant solar powered unit complete with a data logger and hardware to transmit the weather data to a secure web page on www.weatherlink.com. It is then possible to collect this data from any computer or mobile phone terminal.