| Specific questions about projectors |
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Where do the horizontal bars of interference you sometimes see come from?
| When connecting a projector to a video recorder or DVD player you sometimes get a ripple effect, i.e., horizontal bars of interference running downwards over the image.
The system is earthed via both the aerial line and the line filter of the projector power supply. To suppress this ripple you need a sheath current filter high pass filter in each aerial line which does not allow the interference current through but does allow the useful signal to pass. The filter has the standard connector/coupling for an aerial line and is equally suitable for both radio and TV.
Test: unplug all aerial connectors, [and] when the ripple stops this filter is the right solution.
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