The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
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.email@example.com> <3DC1F632.firstname.lastname@example.org> <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
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup