Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!emory!athena.cs.uga.edu!mcovingt
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Sending video signals 100 meters
Keywords: wires, IR, RF, ???
Message-ID: <1991Feb24.054911.10490@athena.cs.uga.edu>
Date: 24 Feb 91 05:49:11 GMT
References: <9942@tetons.idaho.amdahl.com> <2220@umriscc.isc.umr.edu>
Organization: University of Georgia, Athens
Lines: 22

In article <2220@umriscc.isc.umr.edu> robf@mcs213f.cs.umr.edu (Rob Fugina) writes:
>In article <9942@tetons.idaho.amdahl.com> gnd@targhee.idaho.amdahl.com (Greg Darnell) writes:
>>  1. Can I send the audio/video signals across twisted pair with an
>>     acceptable amount of loss/crosstalk?  Should I send it as raw video
>>     and audio, or modulated to channel 3?
>
>It would seem to me (and I may be wrong) that you could send audio and video
>via just about anything...I would think even telephone wire would do...  then
>just plug it all into the inputs of a VCR back in the house...
>
>Rob  robf@cs.umr.edu

No, the inductance and capacitance of the cable will get you if you're not
careful. Remember that video (TV type) goes to 4 or 5 MHz, and what's more,
all frequencies in the range 30 Hz -- 5 MHz have to be passed equally well,
with no difference between the highest and the lowest.
  
  However, you can use a wire of any (reasonable) length if it's a 
  coaxial cable of known impedance, and the driver and receiver (at the
  two ends) are matched to that impedance. This is a way of making
  inductance and capacitance cancel each other out. It's what makes
  large TV studios possible.


Brought to you by Super Global Mega Corp .com