AES-EBU over 30 feet?

[wilcofan]

Hey all,

Does anybody know much about AES-EBU digital cable? What's the longest I should be running this and are there any considerations on quality at longer lengths?

Thanks,
Bobby

 

[Guest]

[quote author="wilcofan"] What's the longest I should be running this and are there any considerations on quality at longer lengths?
[/quote]
Some out of theme:

Pure diffusion of electric potencial
O. Heaviside
Problem in all cables is, that they have dispersion,
this dispersion is caused by capacitance of cable.
Capacitance is dominant to inductance and then cable
performs as RC lowpass filter.
For longer distance pulses forms some as error function
(which is solution of Heat equation, heat diffusion. Application of this solution
was called Thomson (Thomson = Lord Kelvin) cable by O. Heaviside.
some year 1890 or older)
But we want to have only travelling, we want cable to be wave equation
"solver", but it is rather heat equation "solver".

If someone see, that we are modern than 1890, in cable technology
not. Cable must be distortionless. We want to have wave equation
as result. But for cables we have still heat equations. And we make repeaters and equalizers etc.

It is general solution to this. To make cable more magnetic.
In early times (1920) cable copper wires was wounded around by
magnetic ferrous wires. This was KRARUP cable.
These cables had low dispersion and losses in audio band.

Now, we have space technology, and cables are still the some,
Every producer control dielectric part of cables, but no producer
controls magnetic part.
Why nobody use cylindric magnetic layers on the copper wires of cable,
if we know, how to deposit it. They was used in computer memories.
Now, magnetic memories are obsollette, but why not use developed
technology to control magnetic properties of cables?
Why our cables are worse than KRARUPs 1920.

xvlk

 

[Bryson]

With properly spec'd equipment and 110ohm AES cable, several hundred feet. I think Belden specs their AES cable at 600ft/180m.

 

[Guest]

[quote author="Bryson"]With properly spec'd equipment and 110ohm AES cable, several hundred feet. I think Belden specs their AES cable at 600ft/180m.[/quote]
Yes, specially made cable can be with thicker insulation,
then capacity is lower and lenght can be longer.

But diffusion and parameter dependancy (for the some cable, it
can be signal to spurious ratio)
with quadrat of length (as proposed by O.Heaviside) is still.

xvlk

P.S.: and some fotos of AES-EBU repeater ? Or to repeater DIY ?

 

[mcs]

[quote author="xvlk"]P.S.: and some fotos of AES-EBU repeater ? Or to repeater DIY ?[/quote]
Isn't the CS8427 an instant AES-EBU repeater? I am working on a board using the chip, and I think a repeater should be simple to make.

Best regards,

Mikkel C. Simonsen

 

[PRR]

Peep http://www.genelec.com/support/faq/faq12.php

Like many building-size digital cable systems, 100 meters or 300 feet. It isn't all that hard to drive that length of cable. Setting a shorter limit would not save much money, but setting a much longer limit would require more driver power and more money. In most situations, 300 feet will reach anywhere in the building, a good size.

This is assuming you use AES-EBU cable !!!! "Microphone cable" is not the same stuff at all. Short runs of mike-wire may work, but at longer distances the uncontrolled impedances may suck-down the signal and cause errors long before you reach 300 feet.

Yeah, I know 100 meters is not 300 feet. But this is a round conservative number. EtherNet sure can go more than 100 meters if everything is just-right. I've run 600 feet (182m) by using very good wires and connectors, and not expecting peak datarates.