AVS Forum banner
1 - 9 of 9 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter · #1 ·
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
 

·
Registered
Joined
·
4,649 Posts

Quote:
Originally Posted by nathan909 /forum/post/20846642


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.
 

·
Registered
Joined
·
1,755 Posts
A video balun likely won't have the low frequency response needed for good audio but you can try it, as Colm suggested.
 

·
Registered
Joined
·
1,755 Posts

Quote:
Originally Posted by SAM64 /forum/post/20849392


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.
 

·
Registered
Joined
·
4,538 Posts

Quote:
Originally Posted by SAM64 /forum/post/20849392


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.
 

·
Banned
Joined
·
1,556 Posts

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?
 

·
Registered
Joined
·
1,755 Posts

Quote:
Originally Posted by SAM64 /forum/post/20852883


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.
 

·
Registered
Joined
·
4 Posts
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.
 
1 - 9 of 9 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top