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When stabilization of unstable periodic orbits or fixed points by the methodgiven by Ott, Grebogi and Yorke (OGY) has to be based on a measurement delayedby $\tau$ orbit lengths, the performance of unmodified OGY method is expectedto decline. For experimental considerations, it is desired to know the range ofstability with minimal knowledge of the system. We find that unmodified OGYcontrol fails beyond a maximal Ljapunov number of$\lambda_{max}=1+\frac{1}{\tau}$. In this paper the area of stability isinvestigated both for OGY control of known fixed points and for differencecontrol of unknown or inaccurately known fixed points. An estimated value ofthe control gain is given. Finally we outline what extensions have to beconsidered if one wants to stabilize fixed points with Ljapunov numbers above$\lambda_{max}$.Comment: 5 pages LaTeX using revtex and epsfig (4 figs included). Revised  versio

Stability borders of feedback control of delayed measured systems