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PostPosted: Jun 19th, '17, 14:00 
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Does anyone have a suggestion for reducing - or even better, eliminating - radio interference when the fridge is running and also when charging the house battery? Increasing the distance between the radio and the offending items is not practical. Is there maybe an additional circuit or little electronic something that could be "inserted"?
Thanks,
Pete

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PostPosted: Jun 19th, '17, 14:39 
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I never turn the radio on so have never experienced that. Doesn't help I know, but it's all I can offer. :lol:

Coops.

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PostPosted: Jun 19th, '17, 15:08 
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There are two main paths for such interference into the radio; via the antenna or via the power supply.

Start by disconnecting the antenna and seeing if this makes a difference; if it does then you know you're trying to protect the antenna and antenna lead from interference. If it doesn't then you're trying to clean up the DC supply.

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PostPosted: Jun 19th, '17, 16:02 
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Cooper wrote:
I never turn the radio on so have never experienced that. Doesn't help I know, but it's all I can offer. :lol:

Coops.


Thanks Coops - great answer! Always there to help! :roll:

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PostPosted: Jun 19th, '17, 16:05 
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zebedee wrote:
There are two main paths for such interference into the radio; via the antenna or via the power supply.

Start by disconnecting the antenna and seeing if this makes a difference; if it does then you know you're trying to protect the antenna and antenna lead from interference. If it doesn't then you're trying to clean up the DC supply.


Thanks Zeb. I'll try that next time we're on the boat. How does one "clean up" a 12V Dc supply? Or how does one protect the aerial?

I might just try Coop's method. :D

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PostPosted: Jun 19th, '17, 16:16 
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Ferrites around the relevant cables is a good start. A capacitor across the power supply at the radio should help too. No doubt the electronics whizs will show up shortly, but if you'd had the boat at home, it would have been helpful to know which source you were trying to solve.

Generally speaking, its a good thing to keep the wiring for anything which produces interference (solar panel, regulator, fridge) physically separated from the wiring and antenna and lead for the radio. Don't run them parallel in a narrow space for example - I made the mistake of running my antenna lead and my solar panel to regulator leads down the inside of the same structural 1" aluminium square hollow section. What a racket that produced; I really should have known better and I wasn't at all surprised that I couldn't get away with it!

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PostPosted: Jun 19th, '17, 20:37 
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Interference was bad with my Isotherm dedicated boat fridge. I tried all the suggestions above, they were not good enough.

What fixed it in the end was a direct earth wire from the fridge metal (clamp on condenser tubing) to the battery negative.

My fridge motor runs on 3 phase AC (converted from 12V DC) and the associated electronics cause the interference. I also enclosed these electronics in a earthed metal case but that is a *very* difficult job and not recommended.

Good luck chasing that one, it can take time.
AZ100



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PostPosted: Jun 19th, '17, 21:35 
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zebedee wrote:
There are two main paths for such interference into the radio; via the antenna or via the power supply.

Start by disconnecting the antenna and seeing if this makes a difference; if it does then you know you're trying to protect the antenna and antenna lead from interference. If it doesn't then you're trying to clean up the DC supply.


Thanks Zeb. I'll try that next time we're on the boat. How does one "clean up" a 12V Dc supply? Or how does one protect the aerial?

I might just try Coop's method. :D

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PostPosted: Jun 19th, '17, 22:26 
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Hi All,

With all the problems around the world I would not be surprise if somebody blame Russians, after all they apparently fix the US election with some interference.

Good luck if you can fix it, I don’t have this problem as I am not important, not enough to get anybody’s attention, not to mention interference.

Regards Frank



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PostPosted: Jun 19th, '17, 23:45 
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Perhaps earthing chassis is a good start. Wish I had the boat handy.

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