RF Shielding......in-car power supply

This is the place for posts that don't fit into any other category.

Moderator: RichardW

User avatar
Stickyfinger
Donor 2016
Posts: 10006
Joined: 28 Mar 2013, 22:05
x 735

RF Shielding......in-car power supply

Post by Stickyfinger »

This is reportedly a good one......it emits (as do all my others) massive interference

How would you install shielding to this.....as I am sick of paying for these
20170729_101003.jpg

elma
Posts: 3745
Joined: 13 May 2007, 02:17
x 213

Re: RF Shielding......in-car power supply

Post by elma »

Wrap it with insulating tape and then copper sheet.
https://www.amazon.co.uk/Copper-Shieldi ... B00A235WDA

Alternately look at my blog and install usb as a standalone unit.

Or install a 12v socket further away as per the s2 xantia which has one on the passanger sode if the center console.

dnsey
Posts: 1543
Joined: 20 Oct 2004, 01:39
x 14

Re: RF Shielding......in-car power supply

Post by dnsey »

Take a couple of turns of the output cable round a ferrite ring as near as possible to the supply. Most of the radiation is probably from the cable.
If that doesn't help, build your own using a 5V regulator and a couple of capacitors.

elma
Posts: 3745
Joined: 13 May 2007, 02:17
x 213

Re: RF Shielding......in-car power supply

Post by elma »

But shouldn't the output already be shielded? All my usbs are.

Has your car had a heater matrix alasdair? You seem to have more peoblems with this than others. I wonder if your fag lighter supply has been put back next to radio cables.

User avatar
Stickyfinger
Donor 2016
Posts: 10006
Joined: 28 Mar 2013, 22:05
x 735

Re: RF Shielding......in-car power supply

Post by Stickyfinger »

Full 12 volt Power out is to a Multi Port Block

Ferrite ring already installed.....does not make any difference

Output is OK from the sat nav charger (TomTom)....no radio (reception) interference .....so it is NOT the main 12v fag supply causing the problem.

No noise from the car, no radio (reception) interference or noise from alternator etc when no bullet chargers installed (using for phone and dash-cam)

As soon as I plug in any (I now have 5 of the fracking things) these bullet chargers I get radio "hiss/crackle" as they interfere with radio reception (Both C5 and Xantia suffer) which is very weak in my area.

User avatar
white exec
Moderating Team
Posts: 6824
Joined: 21 Dec 2015, 13:46
x 1205

Re: RF Shielding......in-car power supply

Post by white exec »

I have a couple of these fitted to our cars (XM, RAV4)...
http://www.amazon.co.uk/d/Cables-Batter ... oyota+vigo

Work well, with no interference. Fused.
Unit is a snap-in device, easily slotted into an empty dash location or switch blank.
When powered up, the sockets are illuminated with a couple of blue LEDs; these are easily clipped out if not needed (front fascia clips off).
I fitted a switch nearby, to isolate.

User avatar
Stickyfinger
Donor 2016
Posts: 10006
Joined: 28 Mar 2013, 22:05
x 735

Re: RF Shielding......in-car power supply

Post by Stickyfinger »

No more radio interfearance !
20170729_123118.jpg
This seems to of worked.......
masking tape to isolate then Copper filled PTF tape (great stuff btw)

elma
Posts: 3745
Joined: 13 May 2007, 02:17
x 213

Re: RF Shielding......in-car power supply

Post by elma »

Oh Alasdair you just saved me from so many issues here.
Our plumbing is constantly changing to demands, I had no idea you could get anti seize ptfe tape.
Just ordered a box of it, well the company did.
I think it will be handy when I get to building my electric guitar up as well.

User avatar
Stickyfinger
Donor 2016
Posts: 10006
Joined: 28 Mar 2013, 22:05
x 735

Re: RF Shielding......in-car power supply

Post by Stickyfinger »

Great stuff it is :)