A resonant switched power converter having switching frequency controlled in response to an output voltage thereof achieves over-current protection such as at start-up or under short circuit conditions using a resonant tank circuit which provides a notch filter in addition to a band pass filter. More particularly, apparatus and method are disclosed for depositing such diamond structure on a rugged polycrystalline substrate. In still another embodiment, the patient support includes one or more filler portions that are selectable so that the patient support may conform to bed frames having different deck configurations. A pivot stop prevents the leg interconnectors from pivoting beyond the open positions. The agitator can have differing agitator elements such as bristles or a fluff wheel. The system uses a signal processor that is configured to apply beam sharpening to the radar video stream and which selectively varies the level of beam sharpening applied as a function of range andor a land map generated from the radar video stream so as to generate an output selectively beam sharpened radar video stream.