On Fri, 14 Sep 2007 16:17:42 -0500, "amdx" wrote:

I think this
moon cut effectively make the gap look larger.

Hi Mike,

It is simply a function of the mechanical connection of the line at
that point (the inner conductor needs the cut-out and the shield has a
closer point of attachment).

So now what can the group tell me about;
Driven element impedance

50 Ohms.

the gap

the distance between the closest points of contact before the line was
installed - i.e. the thickness of the inner conductor's insulation
(true for absolutely every antenna built).

coax length impedance transformation

Not sure that matters if in fact it has been designed to be a Z
transformer. If so, then you have one of several dimensions possible
n/4 wavelength or n/2 wavelength where n is odd.

the 4 toroids

Decoupling.

73's
Richard Clark, KB7QHC