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post #1 of 7 Old 06-15-2015 Thread Starter
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GPS Static on VHF

Any ideas why a Garmin 3006 chartplotter would suddenly start causing static on an Icom M422 VHF? They both have been on the boat for roughly 7-8 years. Issue just appeared this season after launch. No problems prior to this. There is no issue with static using a handheld VHF in the vicinity of the chartplotter. No static on ICom when chartplotter is off. Chartplotter is operating fine. Any guesses?

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post #2 of 7 Old 06-15-2015
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Re: GPS Static on VHF

Corrosion on one connection somewhere?

Has anything at all changed? New wires for something else passed either unit?

Can you sheild the wires with aluminum foil?

Can you twist each pair of wires?

Can u twist one set of wires around a ferrite in a USB cable as a test?

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Re: GPS Static on VHF

Nothing has really changed, no new equipment. Called Icom. They suggested testing with a handheld which I did but it was near the chartplotter. Maybe I'll try getting the handheld near the wiring.
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post #4 of 7 Old 06-15-2015
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Re: GPS Static on VHF

My Standard Horizon VHF just started doing something similar anytime the chart plotter is on and passing NMEA sentences to the VHF. It's quiet but annoying as it even happens when the VHF is off.
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post #5 of 7 Old 2 Weeks Ago Thread Starter
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Re: GPS Static on VHF

Well the static does not appear to be coming from the power source as I hooked up the radio to a separate 12v battery and still got the static. I'm going to try to hook up a separate antenna to see if that might be the issue. Although the Icom M422 VHF may be relatively new, the antenna predates my 10 year ownership of the boat and may go back to the late 80's. Could the cladding on the antenna cable go bad over time?

I also have an old VHF that I'll hook up to see if it has the static issue also or possibly if the issue is with the radio.
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post #6 of 7 Old 2 Weeks Ago
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Re: GPS Static on VHF

I would bet your ICOM is the issue. Mine was.


Read this link ICOM VHF repair (cheap)

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Re: GPS Static on VHF

Quote:
Originally Posted by countdemonet View Post
I would bet your ICOM is the issue. Mine was.


Read this link ICOM VHF repair (cheap)
Thanks for the link. If the FI3 or F13 filter on the board if bad I guess it could be responsible for passing through some interference from the GPS. All they suggested when I called Icom a few weeks back was the use of an in line 12v power filter. I'll ask about the board issue.
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