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VHF Antenna Installation on 220 OUTRAGE Arch
|Author||Topic: VHF Antenna Installation on 220 OUTRAGE Arch|
posted 12-25-2010 09:36 PM ET (US)
Hope everyone had a great Christmas.
I have the Lowrance HDS 8 with Structure Scan installed and the next install will be the HDS 7, VHF radio, and an antenna. The plan is to place the radio below the bracket mounted HDS 7. Kind of a mess right now.
I need to mount the 8-foot VHF antenna on the T-Top of our 2009 Boston Whaler 220 Outrage, but the bracket is just about as long as the tube where the diagrams call for it to be installed.
I need some advice on how to secure the antenna bracket, through bolt, tap the tube or something else?
I'm a bit concerned that the bolt holes will be close to the edge of the tube and through bolt could compress the tube.
posted 12-26-2010 06:45 AM ET (US)
Gosh, that might be a difficult drilling job. One idea might be to take the bracket to a good welding shop and have them fabricate and weld a slightly larger plate to the bottom of the bracket, large enough to clear the mounting tube on the boat. Drill and countersink four holes. Fabricate a duplicate bracket. Mount using the second bracket as a sort of clamp.
Could the antenna bracket just be welded to the tube?
Clear as mud?
Regards - Don
posted 12-26-2010 07:54 AM ET (US)
How about a clamp the mounts to the round tube that appears
to go to the right in the "view from above"?
posted 12-26-2010 08:19 AM ET (US)
Unfortunately the round bar would be well within the canvas.
I'd like to mount it close to the recommended location, this is from the Electronics Diagram.
It says the holes are Pre-drilled but they are not on ours.
posted 12-26-2010 09:45 AM ET (US)
Give Boston Whaler customer service a call, and ask them what particular antenna mount they recommend for that location. The drawing mentions a mount designated as "1815 SS Quick-Fit". This may refer to a NAVMAN antenna mount. Recall that NAVMAN was once owned by Brunswick, and this may have made it more likely that Boston Whaler would use a component made by another Brunswick-owned company.
Cf: Page 49 of this catalogue which shows a 1815 SS Quick-Fit mount:
From your photographs, it appears to me that the base of the antenna mount you have now is too large for the area on the arch tube. If you want to use that mount, it would be necessary to make a custom-fabricated spacer to go between the rounded arch tube and the flat base of the mount. You could fabricate such a spacer from a material like Delrin or KING StarBoard.
Because you plan to install an 8-foot tall antenna, you will need a very strong mounting point on the arch to receive the antenna mounting base. You might also consider mounting a shorter antenna, say a four-foot high antenna, as an option to reduce the turning moment on the antenna and thus reduce the stress on the mounting point.
posted 12-26-2010 09:53 AM ET (US)
It also appears that the NAVMAN 1815 mount incorporates an electrical connector for the antenna transmission line and is intended to be used with a specific NAVMAN antenna, possibly the NAVMAN 1710. There is another NAVMAN mount which appears similar to the 1815 mount but does not have the assoicated electrical connector and transmission line; this was called a "standard mount" by NAVMAN and was their part 49535. This part is equivalent to the NORTHSTAR part AA000222. This may be a similar-size mount that will fit onto the space available on your arch tube. See page 6 of this catalogue (after you admire its cover):
posted 12-26-2010 11:03 AM ET (US)
Got delayed on the cover.
From the best I can tell most of the surface mounts use a 3" x 1 1/2" on center bolt hole pattern. I suspect that the Navman quickfit does also have the same dimensions.
I will check with Whaler support tomorrow.
posted 12-27-2010 04:44 PM ET (US)
Although my 210 T-Top is slightly different as you can see in this picture the bolts do not go through and I have a GPS mount on the port side and a VHF quick release on the starboard on the front cross member
They must be drill and tap thats why they are machine screws in your parts diagrame
posted 12-27-2010 06:33 PM ET (US)
Rob: what you need to fabricate is a spacer that will have the hole pattern to fit the antenna bracket(one side), then inside that hole pattern drill two holes that will center and allow you to bolt it to the t-top. The 4 holes that hold the antenna bracket can be drilled and tapped to 1/4 20 for the four screws, and the two inside will just be holes that you can bolt through. You will need to drill a hole in the center of the spacer for you antenna wire. I would use a solid piece of alum for a bracket about 1 inch deep so you have plenty of threads for the antenna. Just put some red never seize on the threads to hole the screw in place...Good luck Ps any welding shop/t top place should be able to make this for about 20 bucks max, you can have them tapper the bottom to match the same size of the t top...good luck
posted 12-28-2010 06:42 AM ET (US)
Thanks. right now I'm on the hunt to find out what the factory installed bracket dimensions are and how they relate to the tube widths. I did confirm that they tap the tube to mount the bracket.
posted 12-29-2010 11:44 AM ET (US)
Why not simply redrill the antenna mounting bracket with new countersunk holes that are a better fit for your mounting location? As an alternative, have an appropriate sized pad welded to the top of the tube to accept your mounting base.
posted 01-03-2011 07:58 AM ET (US)
Just to update you on the progress:
I ended up using the bracket bolt hole spacing and it ended up working out. I drilled and tapped the holes and mounted the bracket and vhf wire connector.
It was tricky getting the vhf wire through the T-Top tubes, expecially the the bar that connects the bar that connectes the cross bars. There was a small opening on both end inside the tube. I had to end up using a vacuum to suck a string through to help guide it back.
Thanks for the advise guys, not sure I would have been able to tackle this myself if it were not for the information on this forum.
posted 01-03-2011 02:20 PM ET (US)
Your installation looks first-class. Good work. Thanks for the photographs.
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