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SMD Keyfob Signal Interference


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larbel 
Member - Posts: 10
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Joined: August†11, 2016
Posted: September†27, 2019 at 8:00 AM / IP Logged Link to Post Post Reply Quote larbel
Hi guys... I'm trying to add some ambient lighting to my Audi 8V, I'm using OEM VW SMDs for the purpose and running the wires as illustrated in the picture. It's hooked up to an ambient light wire and ground, but it created some EMI/RFI interference with the keyfob, I literally have to stand within inches to the car before I could lock and unlock the door, it doesn't really matter if I hook them up with other wires or ground, still the same result, but if I hook them up to external power than it's all fine so I guess the SMD isn't the fault here and it's the wires or the length of the wires? I've since added 4 small ferrite beads to the wires, it helped a little but still working very intermediate.. Can someone please help and see what else can be done to fix this? Thanks!!
SMD Keyfob Signal Interference - Last Post -- posted image.
SMD Keyfob Signal Interference - Last Post -- posted image.
SMD Keyfob Signal Interference - Last Post -- posted image.
geepherder 
Platinum - Posts: 3,584
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Joined: October†27, 2003
Posted: September†27, 2019 at 9:09 AM / IP Logged Link to Post Post Reply Quote geepherder
I'm guessing by your picture that power is connected in the passenger kick panel, right? You mentioned you tried other wires, but were they in other locations, or the same general area? Have you tried moving it to the center console, or the driver's side?
Are you using a factory ground location? If so, is that shared with the keyless module or something related?
If none of that makes a difference, you could try a DC-DC converter to try and provide a cleaner power source (since external power worked).
My ex once told me I have a perfect face for radio.
larbel 
Member - Posts: 10
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Joined: August†11, 2016
Posted: September†27, 2019 at 10:20 AM / IP Logged Link to Post Post Reply Quote larbel
Thanks!! Ya, all Iíve tried are the wires from the same general area, will try the center console and driver side tomorrow!!!
larbel 
Member - Posts: 10
Member spacespace
Joined: August†11, 2016
Posted: September†28, 2019 at 11:36 AM / IP Logged Link to Post Post Reply Quote larbel
geepherder wrote:
I'm guessing by your picture that power is connected in the passenger kick panel, right? You mentioned you tried other wires, but were they in other locations, or the same general area? Have you tried moving it to the center console, or the driver's side?
Are you using a factory ground location? If so, is that shared with the keyless module or something related?
If none of that makes a difference, you could try a DC-DC converter to try and provide a cleaner power source (since external power worked).
Hmm... I tried both tapping them into center console area power/gound and driver side power/ground.. Still getting interference, does this mean it's more coming from the SMD itself? And if I want to try DC-DC converter, do you have any recommendation? Or would and 12V dc to 12V dc converter/regulator works? I've supposed wrapping the SMD itself with tinfoil wouldn't help either? Thanks!!
geepherder 
Platinum - Posts: 3,584
Platinum spaceThis member consistently provides reliable informationspace
Joined: October†27, 2003
Posted: September†28, 2019 at 11:51 AM / IP Logged Link to Post Post Reply Quote geepherder
It was worth trying. If you power the SMD's externally and have no noise, that tells me they are not the source of noise.
I don't have recommendations on a DC-DC converter (I've never had to use one), but you want a regulated output, so it should be clean. However, this clean power costs efficiency, so keep that in mind.
My ex once told me I have a perfect face for radio.

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