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Old 09 May 2014, 11:18   #1
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VHF background noise

Heading out other day I decided to do radio check with Humber coastguard , there response was I came through loud and clear but with background noise!!!
I'm guessing this may be to do with all power cables from battery being close to vhf wires?
Another question is I have magnet block/ clamp which came with radio so where is it to be fitted? Sure this has something todo with limiting interference etc
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Old 09 May 2014, 11:38   #2
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Probably not battery cables. Usually noise has to do with the antenna cabling picking up stray signals from AC sources. Might check things like transducer cable from your fish finder, and route the antenna cable away from the engine (spark plugs blast a lot of RF signal.) Also, double check all the antenna connections and make sure they're tight and well connected.

The ferrite bead *may* help, though I think it's supposed to knock down outgoing interference rather than incoming.

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Old 09 May 2014, 11:46   #3
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Odd question, but do you have any LED bulbs onboard and were they on at the time? The cheap ones sometimes interfere.
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Old 09 May 2014, 11:46   #4
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Yeah it was outgoing as coastguard said when I called up it was loud n clear with background noise, so where is best to fit the ferrite I have?
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Old 09 May 2014, 11:52   #5
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No leds on rib mate
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Old 09 May 2014, 11:57   #6
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make sure your spark plugs are fitted with resistors - ngk code generally has Z or R in the code
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Old 09 May 2014, 12:06   #7
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Where is best to fit ferrite
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Old 09 May 2014, 12:14   #8
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Just to add although power was turned on the engine was not running
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Old 09 May 2014, 13:57   #9
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I'm not convinced the CG knows that much about radio. Before buying or changing anything borrow a HH and listen to someone making a test call on your boat's radio with the engine on. I wouldn't be surprised if the 'background noise' was a one-off and has gone away now.
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Old 09 May 2014, 14:48   #10
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**** me. He is listening all it all day. If this call came through with background noise mentioned in the reply it obviously has background noise that others haven't got! So the guy on watch is going the extra mile and giving the OP an honest report of his transmission. He doesn't need to have an aerial in his back garden at home to be able to do that.
And yes I have been there and done that! Not the aerial , the CG bit
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