In THEORY, the DSL stuff should be all differential, so passing it
through a common-mode ferrite choke should not affect or attenuate the
DSL signals at all. "Too much" ferrite should not be an issue, if you
keep the filtering common-mode.
On the other hand, a 160 meter tuned circuit or trap, inserted into
the phone wires (as a differential filter), could indeed mess with the
DSL.
This all assumes that the line is well balanced. If it isn't, then
your 160m signal might be getting onto the line as a differential-mode
component, that common-mode filters won't fix. (That might be why
N1BUG has problems in the rain.)
Andy
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