ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Anybody comment on materials pricing?
by gfretwell - 06/10/21 01:33 PM
2 pole GFI feeding 1 and 2 pole loads
by gfretwell - 06/04/21 02:27 AM
Lock-down Thread
by HotLine1 - 06/01/21 08:15 AM
Updated Forum Software
by Admin - 05/31/21 12:09 AM
Square D "All-In-One" Panelboard
by HotLine1 - 05/29/21 12:13 PM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
0 members (), 42 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 3 1 2 3
#160150 06/09/05 09:22 PM
Joined: May 2003
Posts: 2,876
E
e57 Offline OP
Member
Just fishing for opinions....
Line In/Out Audio via 60' cat-5 to RCA jacks?


Mark Heller
"Well - I oughta....." -Jackie Gleason
Joined: Jul 2004
Posts: 9,643
G
Member
Electrically it works. The trick is isolating the 60hz hum.


Greg Fretwell
Joined: Dec 2003
Posts: 886
H
Member
I think you guys lie awake in bed at night just thinking up lame uses for CAT5.

-Hal

Joined: May 2003
Posts: 2,876
E
e57 Offline OP
Member
It's just so 'available', and convieniantly run between my stereo, and computer sound card right now. Otherwise, I wait and do it right with 4 runs on RG-6 w/ F-RCA adaptors later, when I open the walls again. (when-ever that is?)


Mark Heller
"Well - I oughta....." -Jackie Gleason
Joined: Jun 2005
Posts: 49
G
Member
http://www.belden.com/college/college.htm

click on "Technical Papers" in the Cable Training section. Third to the last link in the Broadcast Audio/Video section is a paper on A/V over cat5.

Joined: Dec 2003
Posts: 886
H
Member
Okay, okay. You may get away with it if you convert your unbalanced lines to low impedance balanced with transformers at either end of your UTP.

We do this to put audio for music-on-hold on runs of CAT3 where the source and telephone system is far apart. Sometimes the pair is even part of a multi- pair cable and we don't have problems with crosstalk or hum.

-Hal

Joined: Jul 2004
Posts: 9,643
G
Member
I have PC out audio going around my house from my MP3 players.
The problem I see most often is when one end of the audio line is grounded (PCs do that) and you are going to another piece of equipment with a grounded signal conductor (some stereo amps or any TV connected to cable). If there is a delta between those grounds it shows up as hum. Absolutely ugly was when I tried to go from the "out" of one PC to the "in" of another one in another building. You can get that same effect if you have a stereo amp with multiple inputs, one of them being grounded(that TV I spoke of).
"Fat wire" bonding will make most of this this go away (why stereos have the ground lug on the back) but that may not be practical over long distances.

BTW what type of transformers would you suggest?


Greg Fretwell
Joined: Jul 2004
Posts: 9,643
G
Member
After reading the article I am convinced there is nothing wrong with using cat5 this way. You would need a spectrum analyser to see the problems they outline and I doubt anyone who has ever used a hammer drill or a shot pin gun could ever hear it. To all of those audiophools who say they can hear the oxygen in their cables I say "Huh?"


Greg Fretwell
Joined: Dec 2003
Posts: 886
H
Member

Joined: May 2003
Posts: 2,876
E
e57 Offline OP
Member
That was an informative article...

No so concerned with ground loop noise, or should I say yet. It's an issue I can handle if need be.

Cross-talk would be an issue if I could hear the phone ring through my amp at a Gazzillion dB! Might even make an interesting 1/2 hands free phone. [Linked Image] Won't be sharing cable though.

The reason I was even thinking of it, was that all of the MP3 network devices are poor quality, and ad-ware based software. I got one and it is driving me nuts. Tries to sell me stuff everytime I start it up. Also doesn't operate from any other of my audio programs. I can listen at the office from the speakers there, but sometimes nice to listen from the living room, on the big amp and speakers. (Rotel, and B&W)

They do make a connector for this: http://www.levitonvoicedata.com/catalog/BuildPage.aspx?BuildPageID=8

I was wondering about distance, but noticed that these connectors double up two pairs. Which could help out on that.

I'll let you all know how it goes...


Mark Heller
"Well - I oughta....." -Jackie Gleason
Page 1 of 3 1 2 3

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
dougwells
dougwells
kamloops BC Canada
Posts: 1,156
Joined: May 2003
Top Posters(30 Days)
Admin 11
Trumpy 10
Popular Topics(Views)
280,296 Are you busy
213,389 Re: Forum
200,330 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5