Creating PWM signal for victor

[neg0riz0r]

Hello,

I am trying to figure out a way to get a possibility to quicktest all our Victor 884s and 883s without using the cRIO or any other FIRST hardware.
So I've built a simple timer circuit which gives me a
PWM input rate T = 22 ms
and a PWM puls rate of 1.1 - 2.3 ms (controllable with a potentiometer).
I monitored that signal with a storage oscilloscope to double check this data. The values are correct.
According to that information, it should work fine:
http://www.vexrobotics.com/products/...ontroller.html


But, with the Victor 883 it doesn’t work at all. It blinks orange, which means no PWM signal.
And with the Victor 884 it only works for reverse and stop. If I come to the puls rate > 1.5 ms - which should be forward - it starts blinking orange very fast (faster then the slow 'no PWM signal' blink)

Do you have any idea what I am doing wrong?

neg0riz0r