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CCTV question

D

Dannyboyy

Jan 1, 1970
0
For a remote camera with a regular RCA type plug output do you think I could
splice in CAT5 cable for the run? Would it have enough inherent shielding
for the job?
 
L

Larry Brasfield

Jan 1, 1970
0
Dannyboyy said:
For a remote camera with a regular RCA type plug output do you think I could
splice in CAT5 cable for the run? Would it have enough inherent shielding
for the job?


How much shielding is "enough" depends on how much
interfering field is present and what interference you are
willing to tolerate.

The main problem you will have with CAT5 cable is that
is has the wrong impedance and is likely to create ghost
images or blur edges horizontally, depending on how long
a splice you make. You might be able to remedy those
problems by changing the source or load termination, but
using the right kind of coax would be simpler.
 
L

Lord Garth

Jan 1, 1970
0
Larry Brasfield said:
How much shielding is "enough" depends on how much
interfering field is present and what interference you are
willing to tolerate.

The main problem you will have with CAT5 cable is that
is has the wrong impedance and is likely to create ghost
images or blur edges horizontally, depending on how long
a splice you make. You might be able to remedy those
problems by changing the source or load termination, but
using the right kind of coax would be simpler.

There are baluns sold that match the two. I also recall seeing
circuits to activly drive over 1000' of CAT5e, but where?

http://www.edn.com/archives/1996/080196/16dfcov.htm

This should get you started
 
T

Tom Biasi

Jan 1, 1970
0
Dannyboyy said:
For a remote camera with a regular RCA type plug output do you think I
could
splice in CAT5 cable for the run? Would it have enough inherent shielding
for the job?
NO! Do the job right.
 
A

Andrew Holme

Jan 1, 1970
0
Dannyboyy said:
For a remote camera with a regular RCA type plug output do you think
I could splice in CAT5 cable for the run? Would it have enough
inherent shielding for the job?

CAT5 is 100-ohm balanced; RCA coax video is 75-ohm unbalanced. You need
balun transformers at each end, or active line-driver / receivers.
 
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