Yeah, link on signal fidelity posted by alvieboy speaks just about that. Well you live and learn. Atleast now I know how and why In anycase tried to output 91Mhz out of papilio, used 10x attentuation and a spring ground. Got a waveform (whatever form it was, still saw highs and lows), and got counted frequency value of 90,99Mhz and thats more than enough for me for next few years, and as I said now I know that spartan 3e is able to spit relative high frequency on its outputs and that I can't accuratly meassure them with my gear. So thank you guys for hellping a new guy out. Next to read and try out something with lvds signals