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post #1 of 29 (permalink) Old 04-25-2011, 06:08 PM Thread Starter
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Radio noise

Hi all:

I have installed a Sony marine radio in my 650 prowler. It works fairly well, but I`m experienncing engine noise when the machine is running. I had installed an antenna filter, but that didn`t seem to help.

Do I need a power filter too?

Any other advice on radio installations, many thanks.
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post #2 of 29 (permalink) Old 04-25-2011, 06:13 PM
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A power filter and make sure your wiring is directly to the battery and well grounded. Antenna lead should be as far away from the coils as you can get them.



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post #3 of 29 (permalink) Old 04-25-2011, 06:20 PM
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post #4 of 29 (permalink) Old 04-27-2011, 03:30 PM Thread Starter
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I would say whining, didn't really notice any ticking. I've mounted the antenna just forward of the glove box outside of the frame.
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post #5 of 29 (permalink) Old 04-28-2011, 01:20 AM
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Sounds like you need a microferad for signal impedance



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post #6 of 29 (permalink) Old 04-28-2011, 04:00 AM
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I mounted mine horizontally over the windshield so the trees do not bust it off.



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post #7 of 29 (permalink) Old 04-28-2011, 07:55 AM
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Something quick and easy for you to try. Take a peice of wire 18,16 gauge and attatch it to the ground side of the battery. Now just touch it to the outer case of the deck. Does the engine noise change or go away? If it is still there try getting your power from the battery. Yep I mean both plus A and plus B. I realize that you already should have one that is hot all the time for memory. But where I am going with this that a battery does a descent job of being a noise filter in most cases. If you tried these and they worked great. We can get into how to wire a relay in to make all this work off the battery and off the the key or a switch if you like. Or of course it can be hot aal the time. If it does not have back lighting or something other than memory that will drain the battery. Oh and one more thing to consider is to run your test wires away from the main harness if you can. The main harness can emit noise causing interference. If this stuff does not work it might be time for noise filter. But you should already have one of those built into the deck.
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Originally Posted by paradisedude View Post
I would say whining, didn't really notice any ticking. I've mounted the antenna just forward of the glove box outside of the frame.


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post #8 of 29 (permalink) Old 04-28-2011, 01:43 PM Thread Starter
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Thanks for the tips. I will give it a shot this weekend and report back with the result. My machine is at the cabin, so I only get to work on it during the weekend.

I actually tapped into a couple of power leads under the dash (directly off the wiring harness). I'm getting constant power from the cigarette lighter socket, and switched power from a lead from the ignition switch.

If I knew a power filter would eliminate the noise I would be more inclined to do that than to screw around running additional wires and relays (more time for riding that way!)

The antenna I have is a whip FM antenna, only about a foot long. I've mounted it to the plastics and wondered if it needed to be grounded to the chassis to work effectively? The antenna filter that I installed can be seen here, it helped reduce noise:

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post #9 of 29 (permalink) Old 04-28-2011, 03:43 PM
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That tells a little more of the story with the antenna generating noise. The antenna should be grounded. You are having some ground loop problems. If you unplug the antenna is the noise all gone? If not the wires you tapped into might be suppling the noise.
The inline noise filter might help. But the newer descent decks all ready have noise suppresion built in. Does not mean your way might be not be better if thats what you want to do. Don't let the relay scare you. You probably don't need it. And if you do they are very easy to do. Let us know if you need anymore help.



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post #10 of 29 (permalink) Old 04-29-2011, 04:08 AM
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If it is power related he may have a rectifier diode brealing down in his voltage regulator. You can use a voltmeter set on AC Volts and anything more than .2vac will cause noise. Also a weak battery or bad cells in the battery will cause this as the battery acts like a super large filter to absorb the ac voltage on the dc line.



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