On Apr 3, 9:12*am, Highland Ham
wrote:
K7ITM wrote:
A good web site for calculating the inductance of a cylindrical helix
ishttp://hamwaves.com/antennas/inductance.html. *There's an
inductance calculator for cylindrical helix coils and toroid coils in
the RFSim99 package which you should be able to find for free
download. *It may well be useful to you for other things, too.

======================
Tnx Tom for the above 'excellent' comprehensive web site reference.

Frank *GM0CSZ / KN6WH

Toilet paper cores; kitchen paper towel cores etc.
Wooden dowel rods.
Even cardboard boxes or a plastic bottle or container.