Looking for individually screened ribbon cable

[CambridgeMart]

I'm looking to make up some probe sets for my TLA logic analyser as used cables are insanely expensive; the original cable uses individually screened ribbon cable, as seen here:
https://www.eevblog.com/forum/testgear/tektronix-714-logic-analyzer/?action=dlattach;attach=338150;image
I've searched high and low but cannot find anything like it. Has anyone come across this type of cable?

[ucanel]

If you could not find exact one,
would it be enough to instead of using 8 row individually shielded cable use whole shielded 16 row cable and connect odd lines as shield either.

[NiHaoMike]

Maybe old external SCSI cable? Not the same shape but it's designed to carry many high speed digital signals with minimal crosstalk between them.

[jmelson]

Spectra-Strip made a clone of the AMP coaxial ribbon cable.  I first saw it in the backplane to backplane extension jumpers of the VAX 11/780.  AMP stopped making it, but Spectra-Strip apparently kept the tooling and will make it on order.  We needed a bunch, and had them make 2000 feet for us, 17 coax conductors, 50 Ohms.  I think they can also make it in 75 and 91 Ohm impedance.  We had our shop build a mass termination stripper and press.

Jon

[jmelson]

My 9200 / DAS 720 uses some very wide ribbon, looks a lot like Chabin cables.  It has two different wire sizes, I THINK the grounds are larger diameter, and there are two grounds between every signal.  This is used with the 92A96 acq boards.  The probe pods are totally passive (series resistor with small parallel cap.)

Jon

[smaultre]

On ebay there's tonn's of such probes from 20 to 100$ i dont think, that you find it much cheaper.
https://www.ebay.com/itm/124187132017

[amyk]

The search keywords are "micro-coaxial ribbon cable". It is commonly used for LVDS connections to LCD panels.

[CambridgeMart]

Ebay ones at a reasonable price never seem to be available to the UK, e.g. from the auction listed above "Doesn't post to United Kingdom" 

[David Hess]

would it be enough to instead of using 8 row individually shielded cable use whole shielded 16 row cable and connect odd lines as shield either.

That is what I would try first because it is so simple and inexpensive.  A step up would be to use adjacent pairs for a differential signal and ground every third wire for screening.

[alexwhittemore]

I know Leopard Imaging makes their MIPI cables out of micro coax like this, but I have no idea where they source it and it looks too fine of pitch to be assembled practically by hand into a useful harness.

[CambridgeMart]

Looking through my cable stock, I found that RG178 is nice and small and will work nicely, so I'm going to make up my cables from this. I just need to find a neat way to keep them flat in a ribbon; failing that, I could bunch them up in expanding braided nylon sleeving I guess.

[David Hess]

You could braid the RG178 into flat cable.

[ConKbot]

The construction looks similar to how Samtec does their very high speed connectors. I.e.
 https://www.mouser.com/ProductDetail/Samtec/HLCD-30-1200-TR-TR-1?qs=%2Fha2pyFadug1ss0UNWiEgg7s0vKN4IHC0yaasB0PaXCvXLJ0db4i9gB6hBUOAvrQ

If you can find a source that isn't $8/foot .047 coax may be of use for something dense. https://www.pasternack.com/precision-0.056-semirigid-replacement-50-ohm-coax-cable-fep-jacket-pe-p047-p.aspx

FEP or PTFE highly suggested for your own sanity while soldering. Plus then you can use a thermal stripper for cable prep.
It's just a shame pasternack is so expensive that cutting up a samtec cable is a more viable option

[CambridgeMart]

RTG-178, or at least a Chinese version of it, is available fairly cheaply; it's marginally larger than the Pasternack cable, but that won't be an issue in this case, it is PTFE jacketed (I wouldn't even look at PVC or PE cables for this job).

[PlainName]

find a neat way to keep them flat in a ribbon

Clear UV-settable resin. I used this technique to make up a ribbon from discrete wires for a small connector. The photo is of my prototype, so could be a lot neater. Essentially, just dribble across the strip at whatever suitable intervals and fix with a UV LED in 10 secs. The resin could be the blindingly expensive Bondic, or the super-cheap stuff on Amazon for arts and crafts - both do the same thing as well as each other.