Twin screened cable.

[Dave Plowman (News)]

Have been looking for some twin screened flexible small diameter wire - actually for use in a car injection systems, for the feed from a VR crank position sensor etc which needs to be screened.

Lucas in the 90s used a cable with an OD of 4mm which had a very dense braided screen.

Needs to be as small as possible to avoid the loom becoming too bulky, as there will be several in it, but also reasonably strong.

There's plenty mic cable around which would do the job - but always much larger in diameter.

All I can find is lapped screen with a foil. Is that as good a screen as braided?

[tony sayer]

In article , Dave Plowman (News) scribeth thus

I should have thought so Dave after all its been used in Pro audio for years and years now.

Course braided will still give flexibility and he BBC still do use some lapped wire screened as its easier to make off on Krone blocks.

Canford audio still have them and will cut to a metre length if required.

hone+cables

Course Russ Andrews will have an enhanced one which will cause the motah to develop another 20 BHP at least!......

[spuorgelgoog]

Mogami 2697 (2.5mm diameter), extra-flexible, helical screened microphone cable, specifically designed for use with lavalier microphones.

HST-R-M Designed for specialised applications requiring either an extra flexible mic cable or one of reduced overall size. matt black polyurethane jacket, overall cable diameter of 4.6mm.

both from Canford Audio

Owain

[Dave Plowman (News)]

Yehbut, balanced audio isn't perhaps such an extreme test. Decent co-ax still tends to have a braided screen.

Was hoping to find cheaper than Canford. ;-)

Bit the same as those who supply such cables specifically for the use I want. ;-)

[Dave Plowman (News)]

That may be a bit too small - it has to be terminated in fairly standard car connectors. So the actual conductors need reasonable strength - as the screen and sheath ain't connected at the sensor end.

That is a bit more promising - I'll have a closer look. It doesn't need to be extra flexible - just enough to allow it to be unplugged, etc. As there will be no flexing when installed.

Thanks.

[alan_m]

Not twin but it is small - cable sold as Wi-fi extension cable

Example

[Dave Plowman (News)]

Twin is essential.

[Capitol]

Can it be twisted pair?

[Dave Plowman (News)]

Could be, but has to be screened. And a decent screen at that. The signal isn't that difficult - an approx sine wave of about 1-5v and from about 50 Hz to 5 kHz. But needs to be clean. Input isn't balanced.

It's one of those things where you might get away with plain wire. But best not to risk it.

[Lee]

Last Nissan I worked on used twisted pair in an overall braided screen, for various sensors, so the stuff must be available somewhere...

[Dave Plowman (News)]

Yes - that's what I've seen. But finding it is proving to be a problem. I'd be happy to buy a 50 mtr drum. Maybe even 100 is the price was right.

[alan_m]

Is this a twisted pair within a screen? Use 1 pair of a screened cat 6 cable, however single solid core may be a problem with vibration in a Also comes as External Armoured Cat6

[Capitol]

When desperate, make your own. A couple of lengths of high temp insulated equipment wire, twisted and inserted into braiding, overlaid with heat shrink tubing?

[Dave Plowman (News)]

I suppose this is a DIY group, but that's taking things too far.;-)

Even just fitting reasonably tight PVC sleeving to cables is something I dislike.

[tony sayer]

In article , Dave Plowman (News) scribeth thus

Yes or even a solid one, but thats more to do with losses.

Is the device two pole as such or is one side earthed to the engine block?..

Yes I know but your not looking for more then a few metres are you?..

[Syd Rumpo]

ebay item number 160551731645 for example - 4 metres for £2.35, 2.8mm OD.

Cheers

[fred]

In article , Dave Plowman (News) writes

I doubt you'll like the price but the spec might point you in the direction of other similar offerings:

copper-screen-p167-pg48/

PTFE insulated for heat and chemical resistance plus added rigidity. Braided screen twisted pairs, 4 core (spare cores could be wrapped/strapped/bonded to connector body to provide strain relief) and

3.5mm overall.

Found by searching for screened +twin +ptfe.

[Dave Plowman (News)]

Grounding a sensor return to the engine block is a true road to disaster. They are grounded at the ECU, though. The ECU then being grounded to the block.

I'd buy a reel at the right price.

[tony sayer]

In article , Dave Plowman (News) scribeth thus

Yes I'd expect it is so it must be a two terminal device. I'd have thought some FST cable would work fine for that Dave its essentially balanced operation.

** Wonder what Phil Allison would have to say about it!. **

Got that many to do;?...

[Dave Liquorice]

You may have already seen this cable but latest (April, offers end

8th May) CPC Bulk Bargins page 47 CB1396207 100 m £18.42 inv VAT

"High Quality Fexible Microphone Cable".

OFC Conductors, Spiral braid, ali foil, + cotton yarn, 20/0.1 mm, LDPE insulation, 3mm OD soft PVC sheath.