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: 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 ,
> >email@example.com 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
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
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
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup