Flat ribbon cable to transmit AES/EBU audio from the back-end of a PCI card? - diyAudio
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Old 24th February 2006, 09:15 PM   #1
skpb is offline skpb  Russian Federation
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Default Flat ribbon cable to transmit AES/EBU audio from the back-end of a PCI card?

I need to transmit AES/EBU audio from the back-end of a PCI card to the DB25 connector on the bracket in the neighbouring PCI slot.
What cable should be used?
Is flat ribbon cable OK ?
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Old 24th February 2006, 11:33 PM   #2
tubenut is offline tubenut  South Africa
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Sommer cable make a true 110 ohm AES cable that is round and about 5 mm OD (and cheap). That should work and at least is the correct impedance.
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Old 25th February 2006, 07:35 AM   #3
skpb is offline skpb  Russian Federation
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Please advise flat ( planar ) ribbon cable ( 26 conductors ) with impedance =110 Ohm.
What I found has impedance =92 Ohm.

Since the length of this out-balanced patch cable will be no more than 10 inches, then maybe its presence will not cause much AES / EBU audio degradation?

P.S. AES / EBU transmitter on the back-end of PCI card is transformer-coupled.
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Old 25th February 2006, 08:30 AM   #4
tubenut is offline tubenut  South Africa
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I think AES EBU spec allows 10 or 20% impedance variation so maybe you will be ok. Why do you insist on ribbon cable? How many signals?
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Old 25th February 2006, 08:53 AM   #5
skpb is offline skpb  Russian Federation
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2 Balanced AES/EBU signals IN and 1 Balanced AES/EBU signal OUT.
Round cable is rigid and can accidently pull out the PCI card from the PCI slot.
Ribbon cable is flexible and will not put any strain on PCI card.
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Old 25th February 2006, 09:26 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
are you allowed to fold the ribbon cable? or just gently curve it to it's destination? Does folding affect the impedance? and pass characteristics?
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Old 25th February 2006, 09:42 AM   #7
skpb is offline skpb  Russian Federation
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Yes, ribbon cable will be curved to it's destination.

Folding might affect the impedance, but if there is a 10 or 20% impedance variation allowed by AES/EBU spec , then this hopefully can be neglected.
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Old 25th February 2006, 05:26 PM   #8
tubenut is offline tubenut  South Africa
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I understand the concern about flexibility etc. That is why I recommended you look at the Sommer AES EBU, it is called the Semicolon. Very flexible and designed for AES and DMX. This often means stage work. Stage cables are flexible. Provided the cables are made to fit with no slack you should not have a problem.

My fave AESEBU for little money is Apogee Wyde Eye but it is not flexible enough for your application.
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