Hi Jose,
The 36V will be DC, and it will ONLY be on when the dish is moving. Depending on the size of your dish, there may be a few amperes there, and I guess it could induce something into the Cat5 if they touched, but you can test that easily enough by moving the dish around at the same time the data cable is in use.
High voltage cables should be kept apart from lower voltage cables in case they accidently short circuit together, but I wouldn't call 0VDC and Cat5 a problem.
Maybe it's Disecq motor time Jose :-D
