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From: Chris Carlen
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020826
X-Accept-Language: en-us, en
Subject: Re: Who thinks this?
References: <3DC1D056.firstname.lastname@example.org> <3DC1F632.email@example.com> <3DC2142D.6020809@BOGUS.earthlink.net> <3DC298EF.FEE70EAD@mmm.com.DELETETHIS>
Date: Sat, 02 Nov 2002 19:17:24 GMT
NNTP-Posting-Date: Sat, 02 Nov 2002 11:17:24 PST
Roy McCammon wrote:
> some subtle details about which you may be unaware
> Practical transmission lines look like RC transmission
> lines at low frequency. The _characteristic_ impedance
> approaches infinity as frequency approaches zero. The
> real and reactive components are equal (45 degree phase
> shift). It doesn't start looking like an LC line until
> wL >> R where L and R are henries/m and ohms/meter. For
> ordinary telephone wiring, that's circa 300KHz.
> Dispersionless propagation is achieved where L/R = C/G.
> Higher order modes become possible when the frequency
> gets high enough so the the wave length becomes not
> large with respect to the separation between the conductors.
Roy, I started another thread in response to this, which really opened a
can of worms in my understanding. Thanks for the reply. Hope you can
look at the new thread.
Christopher R. Carlen
Suse 7.3 Linux 2.4.10
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