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From: Watson 'Atto Parsec' Name
Subject: Re: audio line specifications
References: <3DEE2757.EE79B063@crf.canon.fr> <3DEFD744.3A2D8C8D@gv.net>
X-Newsreader: MicroPlanet Gravity v2.60
Date: Fri, 6 Dec 2002 23:03:57 -0800
NNTP-Posting-Date: Sat, 07 Dec 2002 00:06:39 PST
Organization: InReach Internet
IGNORE THIS TROLL
In article ,
> On Fri, 6 Dec 2002 05:28:57 -0800, Watson 'Atto Parsec' Name
> >In article ,
> >firstname.lastname@example.org mentioned...
> >> "Michael R. Kesti" wrote in message
> >> news:3DEFD744.3A2D8C8D@gv.net...
> >> > Vlad wrote:
> >> >
> >> > >Yes. The impedance of the line is NOT important.
> >> >
> >> > The impedance of the line is not usually important, because audio lines
> >> > are usually shorter than the shortest wavelength in the audio band.
> >> ** Not again!! This is non relevant. If you need a ( twisted pair)
> >> balanced audio line to have a flat response over distances of 100 metres or
> >> more then correct termination of the line is important. If wavelength was
> >> the issue then it would not matter until 10 or 15 km.
> >I have read many of the followups, and I don't think anyone has
> >mentioned the subject of the cable capacitance and why it is necessary
> >to have a low enough impedance to prevent the cable capacitance from
> >rolling off the high end of the signal. In other words, the line driver
> >has to have a low enough impedance to drive the line adequately at the
> >highest frequencies, no matter what the length of the line is. It could
> >be only 3 meters long, but if the driver is a crystal microphone, which
> >has a high impedance, then the high end may be rolled off by the few
> >hundred pFs of cable capacitance.
> >> ................. Phil
> Yes you have
> Read it again:
> One of the few ...
> One of the few advantages of the low impedance source is the improved
> resiliency to cross-talk from adjacent lines. In most cases shielding
> is not required for better than 70 db S/N
> At list you aren't advocating that the line must be terminated at both
> ends .
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you put NOSPAM in the
Subject: line. alondra101 hotmail.com
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http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
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