[TCML] Flat strip primary inductance

[Finn Hammer <f-h@xxxx>]

All,

I know this has been up before, but here goes:
A flat strip primary has lower inductance than one made out of round 
conductors. This is not new, but here is an extreme example, I think:
I kept hanging tank capacitors on to the primary assembly, without 
reaching the desired res. frequency. At last I had to investigate further.

The primary is an internal flat strip primary, for a BRISG coil, and it 
consists of 2 turns 180mm dia with 5mm spacing.

All simulators, INCA, javatc, wintesla predict 1.5µH and since the 
primary cap is 7.5µF, the anticipated resonanse was 47kHz.

However, the assembly resonated at 63kHz which corresponds to 0.8µH

It baffels me that such an extreme difference could exist, so I made up 
a sanity check:

2Turns of thich speaker wire, and a 7.5µF cap resonates at 43kHz.

Has anybody experienced this before?

A picture posted to see the primary, and the sanity check:
http://www.hammertone.com/sanity.jpg

Cheers, Finn Hammer
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