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  #1  
Old 05-06-2010, 10:58 PM
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Default CAT5 vs RCA, balanced and unbalanced

Old but interesting read on CAT5 and RCA.

http://www.installer.com/tech/cat5.html
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Old 05-07-2010, 07:59 AM
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Quote:
Originally Posted by RyanD View Post
Old but interesting read on CAT5 and RCA.

http://www.installer.com/tech/cat5.html
Good read. I wonder if shielded Cat 5e/6/7 would eliminate the little bit of noise they found?
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Old 05-07-2010, 09:25 AM
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good stuff there.
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Old 05-07-2010, 11:58 AM
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Sounds like that guy is trying to have the last word outside of a closed forum topic pissing match...

I'm of the opinion (and experience) that if you keep your wires away from the "noise makers" in the car, it doesn't really matter what cables you run. I've used the cheapest RCAs imaginable...to "Zero Noise" by a famous company...to "twisted pairs"...and I now have IXOS cables since they were $6/each, they look cool and have sweet looking ends, and I actually have matching cables

Of course, the simplest test is to run the cable on top of the seats and away from any electronics (ECU, fuel pump, climate control module, antenna lead, etc) and see if it's REALLY the cable picking up the noise.
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Old 05-07-2010, 10:43 PM
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Well, I have a crap load the Cat5e (non-shielded) in the garage so, I'll give it a go.

RCA connectors
http://cgi.ebay.com/2-Pair-Audio-Int...item5ad5456d9a

Anyone know of a cheap flexible shielded conduit to run the Cat5 through?
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Old 05-19-2010, 07:18 PM
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Quote:
Originally Posted by Hertz5400LincolnLS View Post
Good read. I wonder if shielded Cat 5e/6/7 would eliminate the little bit of noise they found?

It has to do with the way the 4 sets of wires are twisted. each pair is twisted at a different rate. It really is amazing the things you can do with Cat5e. I am cert. installer of "Smart Panels" in new homes, and we use Cat5e for everything. Audio, Video, Network and Voice of course.

The technology is just going to keep getting better with Cat5e.
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Old 05-20-2010, 12:03 PM
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Some RCA's already use Cat5 in them.
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Old 05-20-2010, 12:36 PM
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Old 05-21-2010, 03:35 AM
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That is a great link! I might have learned something there, I think.


Quote:
Originally Posted by ryan s View Post
Sounds like that guy is trying to have the last word outside of a closed forum topic pissing match...

I'm of the opinion (and experience) that if you keep your wires away from the "noise makers" in the car, it doesn't really matter what cables you run. I've used the cheapest RCAs imaginable...to "Zero Noise" by a famous company...to "twisted pairs"...and I now have IXOS cables since they were $6/each, they look cool and have sweet looking ends, and I actually have matching cables

Of course, the simplest test is to run the cable on top of the seats and away from any electronics (ECU, fuel pump, climate control module, antenna lead, etc) and see if it's REALLY the cable picking up the noise.
I agree with this but, I don't. I too have used every kind of cable imaginable & I've had mixed results. True staying away from the main noise makers usually helps a bunch, though it's almost impossible to do that the entire length of the cable. Also I've found some car's electrical systems are just way worse than other's no matter what when it comes to producing noise. And if an alternator has various issues like worn out brushes, it'll sometimes produce noise. I just do everything I can to try to eliminate it.

Right now I have a very slight alternator whine that you can only hear when the volume is at zero. I know for sure it's speaker wire going to the door speakers that's causing it because I installed my system in steps over a 3 day period during the week while I drove it to work. The only thing installed were the door speakers & the wire from them to where the crossovers were going under the seats & the noise began then. There were no amps or head unit installed at all.

Also I think a lot of the twisted pair scheme came from most of the guys that do electronics repair & EE's usually twist power wires as a precaution to try to prevent noise. I have a buddy that used to work where I work that is a Ham & also repaired electronics there & he does that out of habit when he's building something for a project.
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Old 05-21-2010, 05:21 AM
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Quote:
Originally Posted by glass22 View Post
It has to do with the way the 4 sets of wires are twisted. each pair is twisted at a different rate. It really is amazing the things you can do with Cat5e. I am cert. installer of "Smart Panels" in new homes, and we use Cat5e for everything. Audio, Video, Network and Voice of course.

The technology is just going to keep getting better with Cat5e.
Couldn't agree with you more. I ran cat5 everywhere in my new home that I could, and I'm happy I did, because my XM receiver would not get signal in the basement, so I made soldered my IR bud and RCAs to the cat5, so its like it never left the equipment room . It helps alot with the home automation system, because I can have IR control of anything in any room.
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