switcher wrote:
In article ,
John Popelish wrote:
(snip)
What kind of insulation is on the wire in the big loop? Its thickness
and dielectric constant have a big effect on the total stray
capacitance each turn will add.


I guess copper 0.7 mm, insulation soft plastic .25 mm

Sounds like ordinary PVC insulated hook up wire. The PVC is a little
lossy, but not too bad at this low frequency. You would have a lot
more trouble with high capacitance if you were using enameled (magnet)
wire. My favorite for such things is Teflon or Tefzel insulated wire
(low loss and low dielectric constant), but it is expensive and hard
to find. Another good, but hard to find insulation is polyethylene.
It is sometimes used in low capacitance, data grade cables, but
stripping out enough for this project would be a career.

Do you think it is practical to pull 6 more turns through your pipe?