[Al Skierkiewicz]

Danny,
I agree with Mike on this. The FP motor (as most brush type motos) generates considerable RF energy due to brush noise. Just looking into the motor will show why. There is a lot of lightning inside when motor is running. I suspect that the CMU cam has a relatively high input impedance on PWM loop (and no RFI filter) while the robot components have lower impedance inputs and filtering. The Victor and Spike also use an optocoupler on the input. By adding capacitors to the motors, the RF output is significantly reduced. It is a method used with motors of these types all the time. The Globe is also a great little generator. I have to add capacitors to this motor when installed in a variety of applications in which they are used. One of which is a rotation control for boom cameras. The noise would get into the video for any camera even close and often generated havoc with wireless mics and guitars amps which have a very high input impedance.
If asked, I would recommend that First not only allow, but recommend, the addition of 0.01 mfd, ceramic capacitors to at least the FP and Globe motors, at the motor leads.