I have the newer cartridge style anemometer connected to a wind transmitter. Most nights the wind direction stops working and points hard North. I know that the sensor indicating North means a signal interruption somewhere, but the pattern of this intermittent failure leaves me baffled. It has been doing this for a couple of months now. These are the clues I have discovered so far:
1. It happens on most, but not all nights (95% of the time, I'd say). It does not stop and start at the same time every day. Usually it gives up between 9pm and midnight and starts working fine again around sunrise.
2. It does not appear temperature related. I have seen it working on days colder than some of the nights it failed.
3. It happens in both wet and dry weather.
4. It is not the transmitter. I tried another one.
Any advice? Just bite the bullet and buy a new anemometer? It is only a couple of years old, maybe I can at least salvage the wind speed cartridge.