Which is better for cables FEP or PTFE - diyAudio
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Old 17th February 2013, 06:24 PM   #1
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Default Which is better for cables FEP or PTFE

They are both "Teflon" but have different electrical and mechanical properties. Is one better than the other for digital cable construction? Thanks
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Old 19th February 2013, 12:40 AM   #2
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Seeing that digital audio is rather low frequency stuff from a cable's point of view, just about any dielectric is as good as any other dielectric.
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Old 24th February 2013, 04:55 PM   #3
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FEP by a margin,
don't know why and don't care it just is and dialectric is key to any electronically generated signal transmission - air is the best dialectric (Heaviside) but as I understand it, a digital conductor should be equidistant from it's sheild, so needs a dialectric to keep it in a centred position but then again some say this is b/s and no sheild is nec. - whatever, you can't go wrong using FEP.
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Old 24th February 2013, 05:00 PM   #4
tvrgeek is offline tvrgeek  United States
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The one with the correct impedance, and if you need so, be plenum rated. It just is not that important at the frequencies for digital audio.
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Old 24th February 2013, 05:03 PM   #5
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If you believe the lowest dielectric constant is best, then PTFE is better than FEP.
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Old 24th February 2013, 07:39 PM   #6
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Old 24th February 2013, 09:45 PM   #7
DF96 is offline DF96  England
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Quote:
Originally Posted by kuribo
If you believe the lowest dielectric constant is best
Why would you believe that? The usual requirement is for a 75ohm characteristic impedance, and reasonable screening. Given that these links are usually short, almost any reasonable quality 75ohm coax should do. Frequency components only go up to VHF, so not very demanding.

There may be a very slight advantage in using a slightly lossy cable, as that will help to damp down any reflections due to poor termination
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Old 24th February 2013, 10:22 PM   #8
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Who said I believe it? I simply stated "IF you believe the lowest dc is best...." Geez, switch to decaff....
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Old 25th February 2013, 10:30 AM   #9
DF96 is offline DF96  England
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I said "why would you", not "why do you". I was leaving open the possibility of your current belief by questioning the reasons for such a belief, were it to be true.

Perhaps you could enlighten me. Given that you don't believe it yourself, I can only assume that you have heard others say it. Did they give reasons for their belief?
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Old 25th February 2013, 12:26 PM   #10
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"Why would someone believe that?" would have been the correct question....Google is your friend. Seek and you shall find.
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