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Author Topic:   Compass Interaction with VHF Antenna
davej14 posted 04-20-2006 02:25 AM ET (US)   Profile for davej14   Send Email to davej14  
The antenna for my VHF radio is clamped to the hand rail at the [port] side of my windshield. This is about one foot from the intended location for my new compass on the top of the console. Will the antennae interact with the compass?
deepwater posted 04-20-2006 08:08 AM ET (US)     Profile for deepwater  Send Email to deepwater     
I had often thought the same thing. My compass is surrounded by electronics. I can only tell you to try what I did and that's turn everything on and move the compass around to see if you have any interference. You can than move one or both to another location .
Chuck Tribolet posted 04-20-2006 08:38 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
What will influence the compass the most is the permanent
magnet in the speaker of the VHF, and that's an influence
whether the VHF is on or off.


jimh posted 04-20-2006 09:45 AM ET (US)     Profile for jimh  Send Email to jimh     
The compass can be affected by ferrous metals. If your antenna contains ferrous metal, it might affect it.

I don't believe the compass will be affected by electromagnetic radiation from the antenna, however it would be prudent, both for the sake of the compass and for the range of your radio, to not mount the antenna near the compass.

davej14 posted 04-20-2006 11:58 AM ET (US)     Profile for davej14  Send Email to davej14     
Thanks Jimh, I was really wondering about the RF interference and the coil at the base of the antennae. If this was going to be a problem I would move it while I'm in the hole patching business.

Unfortunately I already removed the VHF radio and fish finder to prep for the modifications so I can't turn everything on to check. The new VHF speaker will be in the form of a Ram+ mic and it will be located as far away as the console permits.

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