I think the characteristics of so-called WD-1 surplus phone line varies.
FWIW, the two short samples of WD-1 that I have here are as follows:
115 ohms impedance, calculated from the following: .033 diameter
(averaged), .0685 spacing. The dielectric constant of the insulation
(polyethylene) is 2.2.
I just made three transformers for someone using that line as a
bi-directional Beverage, but I think more tests need to be run to see how
it really works in actual practice. But so far, so good. :-)
73, Mike
www.w0btu.com
On Mon, Jul 23, 2012 at 8:43 AM, Tom W8JI <w8ji@w8ji.com> wrote:
> Has anyone ever made any attempt to characterize the line at HF?
>
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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