Can someone recommend a ferrite bead for composite video input purposes? I can find beads that have ~75R impedence at 9MHz (which would be a 3dB loss into the 75R termination) but I don't know if I should stay far, far away from that corner with a bead.
I've looked at some consumer electronics and most seem to use a bead of some kind but of course it's hard to know its properties without pulling it out and applying a VNA.
-- Ben Jackson AD7GD http://www.ben.com/
ISTR that LT spice has a whole pile of Wurth ferrites in the libraries
martin
I've seen no visible picture degradation using low pass filters in the
8-10MHz area. Had a DVR video interference problem the other week. Turned out the DVR was mixing down ~13Mhz noise peaks on the incoming composite signals. Crap DVR. Sorted using external lowpass filters. So yes, filtering somehow at lowish frequencies may be advisable.-- Posted via a free Usenet account from http://www.teranews.com
Is this something we should emulate? I've not used lossy beads in my video-processing designs, and I don't recall seeing them used that way in professional video inputs. What's the story? If a low-pass filter is required for some reason, let it be a real properly-designed filter.
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