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RXTE observed the bright, strongly variable Seyfert 1 galaxy NGC 3516 once every 12.8 hr for 4.5 months and nearly continuously for a 4.2 day period in the middle, followed by ongoing monitoring once every 4.3 days. These data are used to construct the rst well-determined X-ray uctuation power density spectrum PDS of an active galaxy to span more than 4 decades of usable temporal frequency. The PDS shows a progressive attening of the power-law slope from 1.74 at short time scales to 0.73 atfatcat:4zo5ungn5va3hdwoqpq4ocxx2e