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Dual VHF

Old 02-01-2005, 01:24 PM
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Default Dual VHF

When installing two VHF's on a boat, Does it matter how close the two antennas are to each other? Will the be an interference problem?
Old 02-01-2005, 01:46 PM
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Default RE: Dual VHF

I dont think so. (I could be wrong). I use the same antenna for my two VHF's. One is for backup arnd rarely turned on.
Old 02-01-2005, 01:48 PM
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Default RE: Dual VHF

Do you use a "splitter" of some sort?
If so, do you remember where you got it?
Thanks.
Old 02-01-2005, 02:04 PM
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Default RE: Dual VHF

Don't use a splitter. You'll end up losing transmission power. Set it up with two separate antennae.
Old 02-01-2005, 02:18 PM
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Default RE: Dual VHF

You can pick up one of those splitters from any of the marine catalog places, they all carry them in two versions. One is powered the other is manual. You can connect two radios to one antenna or two antennas to one radio with one of them - they work either way, to the extent that they work at all. I wouldn't have one on the boat myself.

Try to separate the antennas as much as is practicle, but don't worry too much about it. Don't keep both of your radios on the same channel though. The last thing you want to be doing is transmitting from your first radio and antenna on Channel-X at your high power while your second antenna, 3 feet away, is receiving and pumping all that power directly into your second radio, also set on Channel-X. At least make it hard to fry it by setting radio 2 on Channel-Y.

For whatever its worth we have a second radio working from its own power supply, attached to its own antenna, and connected to its own GPS for DSC data input. The antennas are just inches more than 5' apart. We've been using that setup for about 5 years now without any problems. Also, one of the VHF antennas has a GPS antenna mounted a foot away from it and the other VHF antenna has a Cell Phone antenna mounted the same distance away from it. As far as I can see none of the equipment has suffered any illeffects from the placement. By the way, because of antenna heights the radiating elements of the VHF antennas on our boat are about 4' above the other antennas.

Thom
Old 02-02-2005, 07:53 AM
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Default RE: Dual VHF

Vertical seperation is better than horizontal separation, mount one higher than the other if possible. If you can, put one antenna on a t-top and, another on the gunwale, for example.
Old 02-02-2005, 08:16 AM
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Default RE: Dual VHF

I have 2 radios and 2 antennas. If you have an antenna failure, your second radio is not of much use. I have both antennas mounted on my hardtop across from each other by 10 feet and they work very well with no crosstalk or interference. If you are looking into a redundant system, use 2 antennas.
Old 02-02-2005, 03:48 PM
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Default RE: Dual VHF

I have duals on a 5x7 t top center consoleand they are only about 3 feet apart both shakespear galaxys,and they work great

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