I am powering a long strip (50m) of ws2801 strips. About once an hour (but not on a schedule) I have a "blink" from my strips. It is annoying, so I've tried various things to silence them.
I installed filtering caps, and that seemed to make a difference. I also removed a ground loop just tonight, and it seems like I might have gotten it down to once every two hours... but it's still there.
I installed 100ohm resistors between the controller and data, but now I've read that 100ohm is for cat5 cable's impedance and that other types of cable need difference resistor values based on impedance. I'm not sure if it will solve the blink or not, but I'm willing to give it a shot.
How can I calculate the impedance of 20awg copper?