On Aug 14, 1:24*pm, m II wrote:
Dave wrote:
On Thu, 14 Aug 2008 11:07:23 -0700, RHF wrote:

? What is the "Ohms" Measurement associated with Antenna Impedance ?

A ratio between the inner diameter of the outer conductor and the outer
diameter of the inner conductor.

I've tried manipulating my twin lead cable into that configuration, to
no avail. The best I can get is something resembling a double helix. If
I leave it twisted like that, it may have genetic ramifications.

mike

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Parallel Feed-in-Lines Twin-Lead & Ladder-Line :
To Twist ? -or- Not To Twist ?

The 'classic' 300 Ohm [TV type] Twin-Lead is 300 Ohms
whether it is Flat {un-twisted} -or- Twisted {Spiraled}.

The "Twisting" of the Pair {Twin} of Wires is supposedly
done to improve the 'local' Noise cancelling properties
from all directions of the Pair of {Parallel} Wires.

Question : For RF uses in the Shortwave Band 3 MHz
to 30 MHz : What is the 'typical' Ohmic Impedance of
common Speaker Wire {Zip Cord} ?

i want to know -cause- iane ~ RHF