Vhf radio - squelch won't cancel background noise

I would imagine that your VHF is OK but receiving a lot of interference from something.
Our club support boat had a new Depth sounder cum GPS fitted. The interference is horendous from the sounder. In that case a different antenna mounted further away helped a bit.
Any way the simple test is to remove the antenna plug n thevHF and see if that stops the noise. If it does then try turning off all other devicees on the boat. If turning off a device stops the noise but it is still there with antenna disconnected then the noise is coming through the power line. A filter would be appropriate on the battery line either at the offending device or at the VHF. PM me for advice making a filter. good luck olewill
 
Does this apply on any channel? It's possible that there's some kind of local interference on one channel, but otherwise it sounds like a radio fault to me. I can't imagine it being a wiring issue.

Pete
 
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