>There is no way to build a perfect filter. Fair, but if we are to expect a certain level of "drift" outside of designated bands, does that mean that the gap b

>There is no way to build a perfect filter. Fair, but if we are to expect a certain level of "drift" outside of designated bands, does that mean that the gap between allocated bands should increase? That is to say, if precision is an issue, what the most effective solution to deal with that lack of precision? From the sounds of it, the technology is unable to comply with the bands allocated, so the regulations around how those bands are distributed should be far more strict, right?