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Old 04 July 2022, 18:47   #1
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Radio noise

I have a small RIB with mid 90s mariner outboard - and have fitted a fixed VHF radio.
All is fine if engine is not running - but if engine is running there is lots of noise and messages are very very difficult to understand.

I have t tried earthing the radio but that does not seem to have helped.

Can anyone point me towards the next things to try?

Thanks
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Old 04 July 2022, 20:36   #2
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Try suppressing the spark plugs
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Old 04 July 2022, 20:58   #3
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Sounds like the radio is picking up emf from the engine where is the antenna. Could be the location or the cabling picking it up. Squelch all good etc?
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Old 04 July 2022, 21:11   #4
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Sounds like the radio is picking up emf from the engine where is the antenna. Could be the location or the cabling picking it up. Squelch all good etc?


Hi thanks - Ariel is on a pole on the transom so yes near the engine - and cable runs in conduit with all the other cables from engine - but canít really see an alternative !
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Old 04 July 2022, 21:16   #5
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Try suppressing the spark plugs


Hi Jeff,

Ok that makes sense - and is kind of what I was thinking - but how ?
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Old 05 July 2022, 09:59   #6
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Hi thanks - Ariel is on a pole on the transom so yes near the engine - and cable runs in conduit with all the other cables from engine - but canít really see an alternative !
Better shielding (how are the plugs connected to the cable? ) or moving the antenna further from the motor electrical components may help
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Old 05 July 2022, 21:31   #7
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Hi Jeff,

Ok that makes sense - and is kind of what I was thinking - but how ?
Suppressed plug caps is how we did it in the old days
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Old 06 July 2022, 18:19   #8
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Better shielding (how are the plugs connected to the cable? ) or moving the antenna further from the motor electrical components may help


Thank you
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Old 06 July 2022, 18:20   #9
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Suppressed plug caps is how we did it in the old days


Cheers - will see what I can find
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Old 08 August 2022, 09:05   #10
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Just thought I would follow up with what worked for me.

I was trying to find supressed plug caps as suggested and came across a question from someone on a different forum - he had a mid 90s murcury and said the hand book recommended two types of plug - one without suppressor one with.

Bingo - quick search showed that there was the plugs I had with suppressor built it - ordered some - problem fixed

Thanks for help
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Old 08 August 2022, 19:06   #11
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Thanks for that update telecast, I just may give that a try and see if it improves the clarity on my handheld.
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