On Apr 19, 3:04�pm, No Spam wrote:
Could one use a length of iron or copper pipe as an RF choke on coax or
speaker leads? �I've seen lengths (1m) of ungrounded copper pipe on coax
used as lightning chokes.

I don't know about iron or copper, but in the early 90's someone
suggested that a tube of steel wool could effectively replace the
ferrite beads normally used in choke baluns. That was proven to be a
bad idea. I would suspect that iron or copper pipe would be far less
effective than ferrite beads. If you check the choking impedance of
say 50 beads vs. an equal length of pipe, you will find the beads
vastly superior.

Gary N4AST