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Component Video & Stereo Audio over one Cat5e

post #1 of 9
Thread Starter 
I have a bunch of these baluns laying around
http://www.ebay.com/itm/20x-Camera-C...item4aab6e69b6
about a $1 each shipped

I send video over it no problem, but I have a few questions:

1. Can I send Audio over cat5 without a balun?
2. Can I send Audio over cat5 with the same video balun on a different pair?
3. How can I send Component & Stereo audio over one cat5 like seen here:
http://www.ebay.com/itm/COMPONENT-VI...item2a11accc31
(sharing grounds and using the extra pare?!)


Thanks for any info,
Nathan
LL
post #2 of 9
Quote:
Originally Posted by nathan909 View Post

1. Can I send Audio over cat5 without a balun?

Sure, but you won't like results. You will have problems with noise and attenuation of the signal
Quote:


2. Can I send Audio over cat5 with the same video balun on a different pair?

Should work OK. Try it.
Quote:


3. How can I send Component & Stereo audio over one cat5...?

With a device like the one you linked to.

FWIW you don't have a ground in the same sense you would with a single-ended circuit, so you cannot connect the wires.
post #3 of 9
A video balun likely won't have the low frequency response needed for good audio but you can try it, as Colm suggested.
post #4 of 9
Quote:
A video balun likely won't have the low frequency response needed for good audio but you can try it, as Colm suggested.

Why? Baseband video starts at DC.

I also doubt that those baluns actually contain a transformer.
post #5 of 9
Quote:
Originally Posted by SAM64 View Post

Why? Baseband video starts at DC.

I also doubt that those baluns actually contain a transformer.

It may theoretically go to DC but there are few low frequency components in a normal video signal spectrum below the 15kHz (or higher for HD) line rate. DC restoration is normally used to clamp the sync negative peak and establish the DC level.

To go from single-ended to differential and back, as a balun does (by definition) requires a transformer.
post #6 of 9
Quote:
Originally Posted by SAM64 View Post

Why? Baseband video starts at DC.

I also doubt that those baluns actually contain a transformer.

I wouldn't buy a passive balun that wasn't a transformer. I did some building at public access TV stations and I used dual op-amps to build differential drivers when I needed a balanced audio line. I agree though that transformers that small aren't too likely to pass good bass.
post #7 of 9
Quote:
It many theoretically go to DC but there are few low frequency components in a normal video signal spectrum below the 15kHz

H Sync is at 60Hz, quite a bit lower than 15.734 KHz.

Quote:
To go from single-ended to differential and back, as a balun does (by definition) requires a transformer.

Correct.
How many quality baluns have you seen with a flat 5MHz frequency response, that retail for $1.00?
post #8 of 9
Quote:
Originally Posted by SAM64 View Post

H Sync is at 60Hz, quite a bit lower than 15.734 KHz.

It's true the V (not H) Sync occurs at 60Hz but the V sync signal actually consists of a group of inverted sync pulses occurring at a 31.4 KHz (twice horizontal) rate so there is little actual 60Hz fundamental component in the video.
post #9 of 9
Some of this depends on how well they have twisted the pairs in the Cat5. All pairs should be twisted at different frequencies which limit the amount of cross talk and noise that can occur. It also depends on how long you want to run this and if you are using 350 Mhz wire or 100 Mhz CCA.
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