DrMD wrote:If I had any errors that where as bad as yours I would try testing the Tx myself.
Could it be the coil on the the reed relay, EMF feed back, relay bounce.
The reed relays feed back through resistors of different values, high and low.
You provided this info. Are the errors when the wind is in a certain direction.
Hard to tell I know as it spins crazily most of the time if there is any wind to talk about.
Wonder if a transient(diodes) protector would help.
Just throwing some thoughts out there.
Perhaps you should go back and have another look at those posts. The wind sensors design does not have any reed relays at all. It does use reed switches that are closed by a magnet passing by, but there are no coils.
Based on my issue, the source of the noise is the speed sensor which uses a single reed switch and no resistors at all; not the direction sensor. And I guess to make it 3 for 3, the transmitter unit counts pulses, so eliminating them will make the sensor stop functioning. The trick is to get rid of the noise without getting rid of the signal.
Gina, is your theory that the batteries are developing higher internal resistance over time, and can't meet the current demand during these pulses? It's a neat idea - a bit counter-intuitive since the addition of cable length should actually slow down rise times and current demand. Perhaps they are driving those switches with some sort of constant power source. It does explain why things get worse as the batteries age, and for me the effect gets worse as the temperature goes down (I'm still using alkalines). The lithiums you are using should have a much lower resistance, although they also have an integrated PTC which might cause troubles...
You might also want to drop a small ceramic (0.1 uF or something) across the electrolytic since they often have high ESR and ESL, or switch to a different technology the next time you are somewhere you can pick something up.
I'm hoping to do a bit on it today.