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Author Topic:   Compass Interaction with VHF Antenna

davej14 posted 04-20-2006 02:25 AM ET (US)
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)
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)
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.

Chuck
jimh posted 04-20-2006 09:45 AM ET (US)
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)
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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Author	Topic: Compass Interaction with VHF Antenna
davej14	posted 04-20-2006 02:25 AM ET (US) 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) 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) 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. Chuck
jimh	posted 04-20-2006 09:45 AM ET (US) 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) 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.