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PCM



Member Since: 25 Jan 2019
Location: North East
Posts: 854

United Kingdom 
Oh. And one other development.
Since one retailer allows free returns, I’m now the proud owner of 4 sets of DRLs.
3 of them cause interference. The last one (the ring one) will be tested tomorrow am.
I have a feeling it’ll kill the DAB signal Banging Head

I therefore conclude the issue is elsewhere. And not the DRL’s themselves.
Post #812791 30th Jan 2020 10:21pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19451

United Kingdom 
That would go in-line between HU RCA output, rear to that unit. The RCA cable from that units output to the Amp.

Poor quality or loose RCA cables can cause a lot of issues in themselves. They can pick up EMF and suffer from vibration and poor contact Diesels Lives Matter. ⛽️🛢️👨‍🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~
I got’ love for Britain, I got’ British pride’. 🇬🇧
Post #812795 30th Jan 2020 11:29pm
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 983

Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
PCM wrote:
Mac frank
What do you mean by the Audio Input line exactly.
It’s worth a try....

If you look at the GL it has Cinch audio connectors. That's how in my case the iPhone's audio output is connected to an input of the radio. If you don't have that, then the noise maybe entering through the power input, which is what the EF type is for.

The general problem with one type of interferences seems to be different ground potentials (voltages) of two connected devices (in my case iPhone and radio) (https://www.sounddevices.com/tackling-ground-loop-audio-noise/). The boxes I've mentioned do a galvanic isolation (they are basically transformers).
Post #812800 31st Jan 2020 7:06am
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PCM



Member Since: 25 Jan 2019
Location: North East
Posts: 854

United Kingdom 
SOLVED

Seems the Kenwood (and JVC) half depth double Dins just don’t have the same reception as other units.
My double din was working perfectly, however when I added an amplifier it brought the noise level up ever so slightly, but just into the region where in some areas the DAB was lost. Then when I added some DRLs this raised the noise level a tiny bit more. Basically into the area where DAB was a challenge.

Took it to the shop. Changed the head unit out with a Panasonic one and their signal capture is far far better. The noise created by the DRLs and amplifier just don’t matter. The DAB signal is still rock strong.

This is a definite lesson to anyone that has the kenwood half depth models and the units sold by MUd stuff. They work, but just.....

I now have 4 sets of DRL’s to return to Amazon. As the ones sold by Dixon Fabrications and ams with the bumper are actually fine. Rolling with laughter
Post #812961 31st Jan 2020 9:04pm
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dioliahary



Member Since: 18 Jan 2015
Location: Manchester
Posts: 668

Scotland 
My new unit is the half depth Mud Stuff, now get fuzzy FM reception when brake switch actuated 🤨 1990 200tdi conversion 90
Post #812965 31st Jan 2020 9:13pm
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PCM



Member Since: 25 Jan 2019
Location: North East
Posts: 854

United Kingdom 
I can’t imagine what the issue with the brake switch is, BUT I’d take it to a decent audio place.
Get them to pop it out and temporarily replace it with another available non Kenwood/JVC unit.
I’d place money on the fact the other unit won’t suffer the same issues. Or actually it will suffer the same noise and interference, but the reception will be so much stronger it won’t matter.

Sorry if this isn’t the answer you wanted. It’s taken me a week and and hours of wasted time to find this out. Even Kenwood don’t know about this yet. But they will on Monday. Thumbs Up
Post #812983 31st Jan 2020 10:25pm
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dioliahary



Member Since: 18 Jan 2015
Location: Manchester
Posts: 668

Scotland 
👍 1990 200tdi conversion 90
Post #812984 31st Jan 2020 10:27pm
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 983

Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
Smile So you removed the symptoms by removing the patient‘s head (unit). Like it Smile
Post #813029 1st Feb 2020 9:23am
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PCM



Member Since: 25 Jan 2019
Location: North East
Posts: 854

United Kingdom 
Yep.
As a further positive I now have multiple sets of DRLs
Today I’m going to do a noise test on each of them. So if anyone wants to know which is best in terms of noise interference, build quality etc.. I’ll be able to recommend a set.
No super posh ones though. Just cheap from China to ring ones. (£10-80 range)
Post #813034 1st Feb 2020 9:51am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16809

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
dioliahary wrote:
I have a similiar conundrum, fitted a new DAB radio and now when I press the brake pedal, the FM signal goes pants 😡 Was working fine with the old radio.


RFI from disk brakes is actually a fairly common problem. Does it do it if stationary or only when moving?
Post #813053 1st Feb 2020 12:08pm
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