This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
If you are using a plain hi-fi type cable to connect from your IIc modulator to the TV/Game switch, then, changing to a video cable may help. If you are using a much longer cable than necessary, try a shorter cable. Another popular trick is to form any unused length into one or more loops (use wire ties or tape to hold the loops together). Wrapping unused cable length around a ferrite or iron core (e.g. from an old transformer) is a variation on the same idea. = = = = = = = = = = = = = =
 
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