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By operating the radio frequency single electron transistor (rf-SET) as amixer we present measurements in which the RC roll-off of the tunnel junctionsis observed at high frequencies. Our technique makes use of the non-linearrf-SET transconductance to mix high frequency gate signals and producedifference-frequency components that fall within the bandwidth of the rf-SET.At gate frequencies >15GHz the induced charge on the rf-SET island is alteredon time-scales faster than the inverse tunnel rate, preventing mixer operation.We suggest the possibility of utilizing this technique to sense high frequencysignals beyond the usual rf-SET bandwidth.Comment: Submitted to Applied Physics Letters. Comments always very welcome,  email:djr@phys.unsw.edu.au (New version contains extra data and new figs

Direct measurement of the intrinsic RC roll-off in a radio frequency single electron transistor operated as a microwave mixer