AVK-6 ultra low noise coaxial cable

[shodan@micron]

void

[TimFox]

To understand the specification:  what voltage is across the cable when the noise is measured during vibration (10 and 40 G acceleration)?
I first thought the dielectric is coated with graphite, from the picture, but the spec reads "conductive fluorosiloxane" for the black layer.

[bsw_m]

what voltage is across the cable when the noise is measured during vibration..

Noise specs:
<30uV at 10G acceleration and 40Hz test freq
and
<250uV at 40G acceleration.

I also want to note that in cables of this series (AVK*), a conductive layer of graphite has never been used.
Special compositions "ФС" are used - special conductive fluorosiloxane elastomers.

[TimFox]

Yes, I understood the frequency and acceleration values, but was wondering if this was done at 0 V across the cable.  With DC on the cable, the noise would go up during the vibration tests.

[TimFox]

How do you remove the black conductive layer over the dielectric?  Only by careful knife work?

[Zoli]

I first thought the dielectric is coated with graphite, from the picture, but the spec reads "conductive fluorosiloxane" for the black layer.

More detailed picture.
The conductive fluorosiloxane elastomers, is elastic, resin like compound with very strong tie with PTFE.
I don't know how USSR scientist create so strong link with PTFE... it looks like black voodoo magic    To terminate a cable end and provide low leakage that layer must be removed, but it is hard.

If the PTFE is etched before bonding, the bond can be pretty tough - don't ask me how I know.
As sidenote, the etchant isn't really high-tech: naphtalene based...