|
Posted by Bill on November 27, 2009, 11:56 am
If you were Registered and logged in, you could reply and use other advanced thread options
"Silicon Sam" wrote in message
>
> My concern was the 24 gauge Cat 2 or 3 TP, when the Bosch calls
> for18Ga Shielded for the comm. A lot of the other cameras in other
> buildings do use the correct cable, and they work fine.
>
Very good point! Over long distances, you get "voltage drop". And the
smaller the wire, the more the voltage drop! So the idea with longer
distances is to use a larger gauge wire. Search the internet for the
words...
voltage drop calculator
...and you can plug in a few numbers. See the results with different wire
sizes and distances.
Then shielding will make for a more clear signal. A long wire acts as an
antenna picking up all sorts of electrical "noise". Ground the shield at one
end only to prevent "ground loops". More on these here...
http://en.wikipedia.org/wiki/Faraday_cage
http://www.epanorama.net/documents/groundloop
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML site map