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Quick update Used an external power source to power up the processor only and still noisy on CH73  Disconnected the devices connected to the fastnet bus junction box and it stops - So time to start disconnecting the power for each display as suggested by Moonduster to determine the culprit...

Spent a few hours working on this one and it looks like it's the B&G Hydra processor that's creating the noise. Disconnected the depth sensor and powered up the processor as a standalone device using a live feed from another power source (nothing else was on) and it instantly makes the...

Thanks for the tips above. I'll try all of those options on the weekend and see what we find. The VHF handheld if a great suggestion or starters Was going to try the emergency antenna on wednesday but ran out of time and didn't want to to have the panel in bits before we did a windy 27+kn...

Hi All Long time since I've posted and looking for a bit of knowledge base help re Ch 73 noise. (Did a forum search no luck) About to do an offshore and regatta later this month and Ch73 is in the Si's - need to fix a Ch73 noise problem. New boat I'm on has lots of noise on CH 73 since a new...