Using very long cables with #40 anemometers
There a few basic issues when using long cables with a #40 anemometer.
- Voltage drop over the length of the cable.
- Noise: The shielding on long cable runs is critical.
The rule of thumb seems to be that the #40 is OK up to 300 meters (about 1000 feet) of 20 AWG shielded cable in majority of applications (for #40H or #40). For longer runs, use larger shielded cable (18 AWG).
Runs up to 3000 meters (about 10,000 feet) are possible. Note that the threshold will rise with long runs due to the voltage drop.
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