Jerry,
Despite using the wrong formula I guess I came to the right conclusion .... you
can't get down to 75 Ohms without some "non-air" dielectric.
I have three HP41C calculators (one in the house, one in the shack, and a
spare) and was surprised something so sophisticated doesn't have hyperbolic
functions; but I believe they were available on one of the plug-in math modules.
73,
Steve
----- Original Message -----
From: Dr. Gerald N. Johnson
To: tentec@contesting.com
Sent: Friday, January 26, 2007 11:43 PM
Subject: Re: [TenTec] 75 Ohm twin velocity factor ?
My HP-15C that I keep in the drawer between this keyboard and monitor
does have arccosh. I used to keep XACT on my packet computer, it
emulates an HP11, I think. Runs in DOS. The scientific mode calculator
that came with Fedora Core 3 gets the same answer of 158.0349 ohms Zo
for 1/2" conductors, with 1" center to center spacing.
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