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| Bushpig Member Since: 07 Nov 2013 Location: Risca, Wales Posts: 236   
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I've managed to finally get hold of some ferrite rings to hopefully solve the HID's interfering with the radio reception.
So should the rings go on the power supply at the ballast or where the power supply runs close to the aerial cable? Presume, that it will end up being a 'trail by error' operation... Thanks in advance  Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Douglas Adams 2012 2.2 Puma |
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27th Feb 2017 8:11am |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467  
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The rings need to go as close as possible to the source of the high frequency switching, IE the ballast, this is to absorb the high frequency content and prevent the wires leading into it from acting as an antenna which radiates the interference.
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27th Feb 2017 8:31am |
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| Bushpig Member Since: 07 Nov 2013 Location: Risca, Wales Posts: 236
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Thanks Gents...
Will let you know how I get on, once they arrive...  Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Douglas Adams 2012 2.2 Puma |
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27th Feb 2017 2:08pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 617  
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And if possible both + and - wire should pass the same one ring. This is to supress the DC current passing through the wires. This current can saturate the ferrite ring, and it will not working correctly to supress the interference.
Standard ferrite ring works good around 100MHz (+-), for much lower frequencies you need a proper filter, fur much higher some additional shielding on cables works better. If you need all frequencies, you hat to combine more types of filtering. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo  |
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28th Feb 2017 8:02am |
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| explore Member Since: 02 Dec 2011 Location: Crewe, Cheshire Posts: 34 
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My LED head lights interfered with FM radio, fitted DAB radio solved the problem
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28th Feb 2017 12:42pm |
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| Bushpig Member Since: 07 Nov 2013 Location: Risca, Wales Posts: 236
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The rings finally arrived in the mail... but are now not needed
While waiting I replaced the aerial and removed all the quick splice connectors (used by the dealer who fitted the spots) with solder & shrink wrap. Now there is no interference  Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Douglas Adams 2012 2.2 Puma |
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13th Mar 2017 10:28am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17372
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A poor earth connection at the aerial end will often result in massive intereference. My LED lightnar rendered the radio unusuable until I cleaned up the connecteion between the aerial and the wing.
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13th Mar 2017 11:14am |
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