Which is better for cables FEP or PTFE
- Thread starter john dozier
- Start date
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.
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.
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.kuribo said:
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
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?
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?
OK. Here is what I found in a 6moons cable review (so usual 6moons pinch of salt needed):
I note there is assertion but no explanation. The words they use might be sufficient to appear to be an explanation to someone who, like them, doesn't know what they are talking about. They may be talking about Dielectric Absoption, but clearly not understanding it.
Also, FEP has a much higher (relative) Dissipation Factor than PTFE. So, lower DC, lower DF...a better insulation...right?.
Certainly in audio applications. Interestingly, as I think someone already pointed out, most teflon insulated CAT5 plenum cable etc. seem to have FEP insulation. Other factors at play I'm sure.
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FWIW,
back home from hospital after arrhythmia heart problems (going back next week) I made a discovery useful for those who make their own cables.
The drip and oxygen tubing was made of - FEP. It's easy to identify as it is much clearer and has a blueish tinge whereas TEFLON which has a slightly milky colour.
The oxygen tubing is about 5mm and 3 metres long before branching into much smaller gauge. This will be perfect for making air/FEP speaker cables.
Used once for each patient it is then thrown away - I just need to convince the nursing staff to save another 7 pieces for me rather than throwing it into the poubelle sac/rubbish bin.
back home from hospital after arrhythmia heart problems (going back next week) I made a discovery useful for those who make their own cables.
The drip and oxygen tubing was made of - FEP. It's easy to identify as it is much clearer and has a blueish tinge whereas TEFLON which has a slightly milky colour.
The oxygen tubing is about 5mm and 3 metres long before branching into much smaller gauge. This will be perfect for making air/FEP speaker cables.
Used once for each patient it is then thrown away - I just need to convince the nursing staff to save another 7 pieces for me rather than throwing it into the poubelle sac/rubbish bin.
Gigabit rate Ethernet signals are very fussy about cable loss, impedance and crosstalk. Fortunately they don't read cable salesmens BS