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Old 05 June 2012, 18:06   #1
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Placing antennas A-Frame

Hi.

What is the optimal placement of antennas on my A-Frame?

Today i just got navigation lights on my A-frame.
My GPS antenna is placed over the console (see picture)

I just bought me a VHF and also planing to install a FM/AM radio too.

So i want to place all my antennas on the A-frame (and also move the GPS antenna).

So i made a picture of what i think is the best solution. The VHF antenna is placed as far from the other stuff as it could be. Is this right or should i do it another way?

Best Regards
Mårten
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Old 05 June 2012, 19:25   #2
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Hi.

What is the optimal placement of antennas on my A-Frame?

Today i just got navigation lights on my A-frame.
My GPS antenna is placed over the console (see picture)

I just bought me a VHF and also planing to install a FM/AM radio too.

So i want to place all my antennas on the A-frame (and also move the GPS antenna).

So i made a picture of what i think is the best solution. The VHF antenna is placed as far from the other stuff as it could be. Is this right or should i do it another way?

Best Regards
Mårten
leave the GPS where it is, low down is good, it gives a more stable reading. The vhf & am/fm are ok on the "A" frame.
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Old 06 June 2012, 03:20   #3
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GPS should not be to the side of the VHF, it should be either above or below it. The manual will give you more info.
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Old 06 June 2012, 05:08   #4
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Hi. Thanks for the tips. I will just have the two antennas and leave the GPS on the console.

/Mårten
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Old 06 June 2012, 05:59   #5
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leave the GPS where it is, low down is good, it gives a more stable reading.
If the accuracy due to the extra couple of feet off the water and the roll of your rib is that important I woud suggest you might be better getting someone to look over the bow than you at a plotter screen! Either that or switch on the "track smoothing" option.

Before this turns into a huge debate, my point is that the realisitc accuracy of the GPS is, say, 3-4m. Your console to frame height is going to be , what another half meter at most? If the boat rolls the console antenna will move say 6". the frame mounted one might move a couple of feet. Is that really an issue in a 3m circle? (Especially when you sat there instantly blocks a couple of horizonal satellites that a console antenna might miss that the one on the frame would see that will help to improve your positional accuracy!)





Back to the OP, just make sure that the antenna bases don't obscure the while light to port & Stbd.
(although if you put the antenna on the slope of the frame it shouldn't be a problem)
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Old 06 June 2012, 07:02   #6
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Looks good.
Just check that the nav light, if it's LED, doesn't interfere with the radios. If it does you'll need to change to a different type of LED.
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Old 06 June 2012, 07:26   #7
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I just thought it looked better to have all the antennas including GPS antenna on the a-frame. But i would never do anything so that the reception or accuracy would be bad or worse. That's why i'm asked whats the best placement, and i got great answers. Thanks guys

I will put the VHF antenna on the slope and keep the GPS on the console.

The navigation light is not a LED type, so i hope that there will be no problem

Best regards
Mårten
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Old 06 June 2012, 09:07   #8
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If the accuracy due to the extra couple of feet off the water and the roll of your rib is that important I woud suggest you might be better getting someone to look over the bow than you at a plotter screen! Either that or switch on the "track smoothing" option.

Before this turns into a huge debate, my point is that the realisitc accuracy of the GPS is, say, 3-4m. Your console to frame height is going to be , what another half meter at most? If the boat rolls the console antenna will move say 6". the frame mounted one might move a couple of feet. Is that really an issue in a 3m circle? (Especially when you sat there instantly blocks a couple of horizonal satellites that a console antenna might miss that the one on the frame would see that will help to improve your positional accuracy
Room for one more in pedants corner
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Old 06 June 2012, 11:14   #9
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Room for one more in pedants corner
Play fair, the OP asked for the best positioning, and 9D280 pointed out that the greater issue is being able to see all the satellites within the viewing arc, and not have one or two blocked by a big chap like yourself if the antenna is console mounted. So, +1 for mounting the GPS antenna on the 'A' frame.
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Old 06 June 2012, 11:24   #10
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I would also consider the wiring for a console mounted GPS is less likely to be chaffed, broken etc as it doesn't need to be under the deck or in any water .

I used console mounted more and more recently and work fine (until I put my sarnies on top wrapped in foil ! spent ten minutes trying to work that out ! )

For VHF radio height is a factor - for GPS not as much is my view.

And FM /AM reception - try an aerial inside the console - again less wiring under deck and less exposure to water and will probably pick up 'tunes' fine.
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