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Arnoldsally



Member Since: 30 Oct 2019
Location: Derby
Posts: 6

United Kingdom 2003 Defender 90 2.5 TD SW Baltic Blue
Interference to radio
Hi all, my 2003 TD5 Defender has been running very well since I purchased it 4 years ago and I am really pleased with it.
I service it and treat the underside with XCP twice a year to keep rust at bay.

I am a radio ham and recently installed a ham radio, I followed all the advice that I was given which was loads but it has a bad case of interference that 50% of the incoming signal is missing.

I have bonded everything, moved the antenna etc etc and still the same. I now think its the alternator as when I turn the key to dash lights only the interference is there and once the car is running its terrible.

Has anyone had this and if so what did you do please.

thank you

Patrick
Post #972185 23rd Nov 2022 8:19pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18920

United Kingdom 
All I can think of is EMF, so you can use some foil or shielding wrap where you can.
High current motors, LED lighting in particular headlights or LED light bars can all cause interference and USB power sources.
All that can be done is use quality aerial / antenna cables, shield it all all and make sure you have good grounds that you have done. Diesels Lives Matter.
Like Thunder We Do Roll’
Post #972189 23rd Nov 2022 9:19pm
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Arnoldsally



Member Since: 30 Oct 2019
Location: Derby
Posts: 6

United Kingdom 2003 Defender 90 2.5 TD SW Baltic Blue
Thank you custom90steve, tried it all and I have no LEDs as they are a known problem to ham equipment and they are not allowed in the house lol.
Most sites are saying fit a suppressor to big items like the alternator but getting to it is another thing.

Patrick
Post #972190 23rd Nov 2022 9:32pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18920

United Kingdom 
Have you tried ferrite chokes? Alternator whine can be an issue, but realistically the only thing you can think about to do with that is change alternator.

I know what you mean with Alternators, they are often a pain to get near. Diesels Lives Matter.
Like Thunder We Do Roll’
Post #972285 24th Nov 2022 9:08pm
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Arnoldsally



Member Since: 30 Oct 2019
Location: Derby
Posts: 6

United Kingdom 2003 Defender 90 2.5 TD SW Baltic Blue
Ebay is fed up of sending me ferrite cores, the Defender is full of them. If the weather is ok I am going to pull a fuse to see if it stops the noise and then work thro all the others too.
Post #972288 24th Nov 2022 9:25pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18920

United Kingdom 
Might be worth doing a continuity check on the Antenna cable, possible break internal or replace.

I agree with ferrites, I found Alu shielding was more effective.

Antennas and reception can be the most annoying thing, the most annoying thing to me is having to gain access to it and the cable. Diesels Lives Matter.
Like Thunder We Do Roll’
Post #972311 24th Nov 2022 10:57pm
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