Memo 142 Is There an Optimum Frequency Range for Phased Array Feeds? Question 2 of the Magnificent Memoranda II M. Huynh R. Smits L. Harvey-Smith A. Bouchard R. Beck D. Obreschkow I. Stairs A. Popping L. Staveley-Smith J. Lazio R. Norris (on behalf of the SKA Science Working Group) August 2012 www.skatelescope.org/publications