[TenTec] Balun Isolator

[Stuart Rohre]

The 95 per cent rating on a coax, means the shield has 95 per cent 
coverage of the coax circumference, and 5 per cent open spaces.  I have 
never seen any technical article stating that this translates directly 
to 95 per cent of the current is contained, as surely that varies with 
the frequency being transmitted thru the coax.  See the Belden catalog 
for further discussions of coaxial shielding.

That is a good project for someone to measure how much current passes 
thru the 5 per cent open space.  Since the shield wires criss cross in 
good woven shields, there may be more shorting of the current, than you 
would expect.  The shield density affects the bending radius of the 
cable and its flexibility.  Of course, using less shield wires lowers 
the cost of production.

-Stuart Rohre
K5KVH