Thank you for suggestions, haven't expected so many responses. Let me answer them:
tooki: Yes, I am somewhere from EU. Next time I will use the word "stranded" wire, instead of litz. That is probably a better term it seems.
I have contacted TTL-Network via email for a quote. But being it a German company, I am expecting German prices (= not good). Lets see what will they offer me.
I am looking for mechanical properties of a microphone cable, which means round 6mm OD, PVC sheath and the fiber/thread filler inside, that makes it both soft and good for pull-strength.
yes you have options...
drop cheap shit and buy a
good fibre link and adapters
Paul
Great suggestion, but fiber optic cables are anything but flexible, especially when one would need armored version of it. And then some durable better connectors than LC for termination. ODC connectors cost arm and leg.
LAPP make some special CAT5/6 cable for use in robotic applications, sort of stuff found in robot chains (e.g. IGUS e-chain). It's not what you would normally deem flexiable, but it is designed for alot of repetive bending.
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There is a big difference in between what is a FLEXIBLE cable and cable designed to be FLEXED repeatedly. What you suggest is likely the latter, which is a pretty stiff piece of cable, that is designed for repeated flexing. I do not need any repeated flexing. And I don't like Lapp, have bought some LiYCY low voltage/data control cabling from them in the past and it was a pretty horrible junk. Much better to go with Helukabel for that.
Check these flat cables, these are astonishing flexible. See photo with a CAT 7 cable (that's what is printed on them) wrapped around an AA battery.
Mine are from Amazon: https://www.amazon.de/gp/product/B08SMHJ6D4
Whoa.
Not for me or this application.
I am looking for something, that would have properties of a soft microphone cable,
There are some highly flexible Cat5e cables for patch cables and industrial applications, but nothing comparable to a soft microphone cable. I agree with perdrix that such a soft cable wouldn't meet Cat5e specs, maybe Cat3.
That is just your speculation, right? Most of the stiffness is defined by the outer jacket, the internal 4 pairs of a UTP when made from stranded wires with tighter twist are already enough flexible. The problem is the piece of sh!t PVC outer jacket, that the off-the-shelf cheap UTP has. (And in case of foil shielding, a lot of the stiffness depends on what type of foil and how it is twisted around).
Just a few days ago, I have bought some sample of a FTP cable with stranded wires and it was way more stiff than a basic cheap UTP with solid core wires. Junk!