Long Distance Anemometer Display

I installed a remote display system for wind speed and direction a few years back, units were 1200m metres apart, using industry standard 4/20mA signals, which obviates the need for special cable and overcomes voltdrop problems. The receiver was then a straight forward voltage operated instrument with a shunt resistor. Whatever output have you got from your transmitter can be cheaply converted to a mA signal.

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A friend of mine needed one of these to place on an island not quite a mile from their sailing club's clubhouse, which is located in a cove. They have an anemometer and wind vane at the end of one of the docks, but it cannot "see" the same winds as there is on open water unobstructed by trees and hills. Inexpensive wireless weather stations have only about a 500' range, so those were ruled out, even though there's a clear line of sight from the little island to the clubhouse. Linear amplifiers and bigger antennas were also ruled out, as the cost would have approached that of a long-range, wireless weather station. I designed a system for them which used a large mirror set at 45 degrees from the horizontal and aimed at the clubhouse to look up at a reflection of a wind direction vane and compass overlay, as well as an anemometer which works similarly to one found here: NovaLynx. The look at it with a 20 power binocular, eliminating the need for electronics. Of course, NovaLynx, and many others, have electronic versions with 4-20 mA loops, if you want an electronic version. By the way, the voltage drop in 1,500 feet of 22 gauge wire is only 0.5 V @ 20 mA, and 30 ga wire will have a 3.25 V drop @ 20 mA, meaning that a 24 VDC supply will still produce 10 V at the terminal resistor.