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VHF Buzz

Old 05-02-2008, 01:35 PM
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Default VHF Buzz

My VHF has a constant buzz on all channels when the motor is running. I can have the key on, radio on and the GPS on with no buzz but as soon as I start the motor the buzz comes on. Anybody have any ideas on what it could be?
Old 05-02-2008, 02:59 PM
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Default Re: VHF Buzz

Interference of some sort. Put a ferrite choke on the positive and negative lead for the radio. You can get ferrite chokes (sometimes called beads) at radio shack if you find a store with a good selection of electronic components. Otherwise, you can mail order them. Or if you have old computer equipment laying around, you can recycle the chokes. If you have any old computer cables (for a mouse, USB device, keyboard, and pretty much anything else that plugs into a computer) that look like this....



Those "bumps" are ferrite chokes. Cut them out and tape them onto the radio power leads. If this does not help, it gets more difficult. You have to trace down the source of the interference. The fix will be cheap - but finding out exactly what to fix may take some time.
Old 05-02-2008, 06:23 PM
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Default Re: VHF Buzz

First locate your engine, remove it, and replace with a diesel.
Old 05-02-2008, 11:39 PM
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Default Re: VHF Buzz

Jim_Arndt - 5/2/2008 6:23 PMFirst locate your engine, remove it, and replace with a diesel.
More great THT advice. What would people do without this site and people giving such great answers!
Old 05-03-2008, 04:15 AM
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Default Re: VHF Buzz

Try running your power leads straight to the battery for the VHF, this may help with the noise. In addition to the ferrite beads or chokes suggested there are in line filters to take ignition/alternator noise out of the power lead. Make sure your antenna lead is OK, a bad cable connection can cause the issue as well. Take the antenna lead off the VHF and see if the interference goes away, if is does the interference is coming in from the antenna not the DC power cable. If you have two batteries, try running the VHF on one battery and the engine on the other.


Jim

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