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Scottratt



Member Since: 18 May 2021
Location: Carlisle
Posts: 7

United Kingdom 
Radio interference
I have an after market radio fitted to a 2011 90 puma.

I’m getting a lot of radio interference when the engine is on. Would a surpressor rectify this
Post #903685 18th May 2021 8:05am
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kmac



Member Since: 07 Oct 2009
Location: Middlesex
Posts: 1294

United Kingdom 2009 Defender 110 Puma 2.4 USW Santorini Black
Typically radio interference can come from unprotected USB products or even LED products.
If you have any of these try the rubber covered ferrite bead products on the offending items - disconnect all and then connect one by one to find the offending item or items

If you want to be really nerdy you can build and put in a common mode choke.

Shax here tells you how to do it

https://www.defender2.net/forum/topic26844...mode+choke
Post #903702 18th May 2021 10:42am
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Scottratt



Member Since: 18 May 2021
Location: Carlisle
Posts: 7

United Kingdom 
As far as I’m aware I don’t have any usb or led.

Would a surpressor be any good
Post #903724 18th May 2021 12:11pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Radio interference when the engine is on. sound pitch change when increases you engine RPM Question

Radio interference with old unit you replaced Question
Post #903734 18th May 2021 12:55pm
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90 Dreamer



Member Since: 13 Jul 2019
Location: Oop North
Posts: 2045

United Kingdom 2016 Defender 90 Puma 2.2 HT Corris Grey
we had an issue with an aftermarket radio years back and after trying various 'fixes' I took the option to remove the radio and found it was simply very poorly connected........
Post #903743 18th May 2021 3:25pm
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Scottratt



Member Since: 18 May 2021
Location: Carlisle
Posts: 7

United Kingdom 
dorsetsmith wrote:
Radio interference when the engine is on. sound pitch change when increases you engine RPM Question

Radio interference with old unit you replaced Question


Yes when engine is on and does increase. I’ve bought it with it fitted so don’t know if it was the sa,e with a different radio
Post #903745 18th May 2021 3:43pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

alternator possibly but check your aerial grounding and radio power grounding
Post #903763 18th May 2021 5:43pm
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Scottratt



Member Since: 18 May 2021
Location: Carlisle
Posts: 7

United Kingdom 
When you say alternator do you mean it’s knackered and needs replaced
Post #903799 18th May 2021 8:03pm
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PCM



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

United Kingdom 
Can I ask what radio you are having the issues with and what if any aftermarket bits have you installed. Led bumper etc?
Post #903805 18th May 2021 8:30pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Scottratt wrote:
When you say alternator do you mean it’s knackered and needs replaced



No it’s not knackered and no it doesn't needs replaced
Post #903813 18th May 2021 9:10pm
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Scottratt



Member Since: 18 May 2021
Location: Carlisle
Posts: 7

United Kingdom 
So how could I fix prob,em please
Post #903856 19th May 2021 8:27am
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

You need look at your 1. aerial grounding i.e. remove aerial from the wing and check aerial grounding corrosion

2. radio power grounding i.e. wiring and connectors make shore good sound connection

3. also check aerial coax cable that the screen and mid core are not shorted to the mid core or cores are not open CCT


Last edited by dorsetsmith on 20th May 2021 1:07pm. Edited 2 times in total
Post #904038 20th May 2021 8:56am
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Scottratt



Member Since: 18 May 2021
Location: Carlisle
Posts: 7

United Kingdom 
Thanks
Post #904046 20th May 2021 9:40am
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