 | Home > In Car Electronics > Radio sometime is getting what sounds like interference |
 
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3750  
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Hello
My radio recently is picking up some sort of interference from some other electrical bits in the car? Crackling and just making an odd sound every now and again? How can I fix this, do I need to add a suppressor? and if so what and how do I wire this in. edit to add I've just noticed these and given I don;t like messing with electrics would these work on the cables? https://www.amazon.co.uk/Topnisus-Anti-int...r&th=1 Thanks Scott |
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5th Oct 2018 10:38am |
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| OsloBlue Member Since: 14 Jul 2018 Location: Essex Posts: 822 
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Poor quality lights will do this. Is it an analogue or digital radio? I'm on IG: https://www.instagram.com/osloblue42/
Current: TD5 '110 "Lucinda" Thread here: https://www.defender2.net/forum/topic62562.html  |
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5th Oct 2018 11:00am |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1309 
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USB ports will also cause interference. Need a common mode choke or suppressing bead on the cable
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5th Oct 2018 12:15pm |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3750
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Kmac
what is one of these, as I plug my phone into the USB port to use Android auto... |
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5th Oct 2018 2:06pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1309
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A common mode choke is a ferrite ring with copper coil and a capacitor on each end
Have a look at this thread which gives a detailed explanation of how to make one. http://www.defender2.net/forum/topic26844.html You can also get ferrite rings such as in the pic below but they some have said they are not so effective ( they clip over the cable supplying power to the USB port) |
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6th Oct 2018 9:09am |
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| EastFreo Member Since: 24 May 2014 Location: Perth Posts: 103 
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I was getting interference and found it was coming from using a USB charger in the cigarette lighter socket. Changed over to a new one and it was cured.
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8th Oct 2018 2:01pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8029  
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Or it's coming from your phone ! Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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8th Oct 2018 2:40pm |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3750
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Hello
This is my set up, The Head unit has a USB input and I have a lead from the back of this to in front of the cup holder with a USB port I can plug in. I use a short USB to USB C lead to connect my phone to the Unit and then Android auto starts. I tried unplugging my phone and it still did it. how else can I eliminate what it could be? I'm tempted to get the ferrite rings and try them on the usb cable? from the head unit to where I plug the phone in. Click image to enlarge |
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8th Oct 2018 3:03pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1309
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"...from the head unit to where I plug the phone in"
yep this could be where the interference is coming from as even if the phone is not plugged in there is a step down transformer converting 12v to the 5v needed for the USb socket. This is drawing current all the time power is supplied to the stereo. You can try the ferrite rings to see if they make a difference - they are only a quid or two. They don't always work, you could try folding the cable on itself a few times and then the ferrite ring over the folded part. |
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9th Oct 2018 8:30am |
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| Stacey007 Member Since: 25 Sep 2015 Location: Cheshire Posts: 3750
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I have tried it driving home and back into work without the phone 'plugged' into anything
Still interference? Is it still the cable causing and issue? I can unplug the phone cable as that's easy but the other one is wired from back of head unit under carpet to the cup holder. Is one of those ferrite rings worth a try on this USB lead |
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10th Oct 2018 8:54am |
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| Puma_MOG Member Since: 08 Sep 2017 Location: Cheshire Posts: 184 
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I was getting this quite a bit after having my tracking installed with the issue being that whenever it sent a notification of my location, which was random, I had said interference. Won't go into specifics on the fix as it has to do with the tracker, but if you have one, that could be it.
I still get it once and awhile but it last 2-5 secs and now that I know what it is, i find it comforting that it gives me piece of mind the kit is working 
Good luck P |
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25th Oct 2018 5:06am |
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