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Old 03 January 2017, 15:05   #11
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Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,260
RIBase
Quote:
Originally Posted by Mode View Post
Hold that - I now have a bigger vision!

Custom made item is the way to go! How does this sound:-

So first two pics are the aerial and fixing bracket.

To this I can add a 316 S/S tube of any length that will then fold down so am now thinking better to fix to the transom which to be honest is where it should be.
I don't think the adjustable hinge will be up to the job in my opinion. The transom takes quite a hammering with engine vibration, sea condition and speed. Add in 7' of stainless steel tubing and you now have a few kg of weight with the Achilles heel unfortunately the hinge at the weakest point.

Quote:
Top end of this tube I then fancy the nav light option as well - same as Spartacus picture (Thanks again!)
I have red and green navigation lights on the console. What's here is an all round white light. Actually it's an anchor light from Salty John, but upgraded LED.

Quote:
Tube length - am going to think about this when I am in front of the boat and how it will fold down.
You want height, so suspect 6-7' is realistic. I went for three sections secured with Protex latches. If I was doing it again, I'd over-engineer and go for latches on both sides. This is the company that made it for me. http://www.marinefabrications.co.uk

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Which Nav Light would anyone recommend?
12v LED light. Anything that is built for marine environment. Hella stuff is nice. Navigation Lamps, Anchor / All Round White, - Hella Marine
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Old 03 January 2017, 15:23   #12
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Country: UK - Scotland
Town: Kinghorn
Boat name: Onward
Make: Honwave
Length: 3m +
Engine: Mercury 2 st 15 hp
MMSI: 235913495
Join Date: Jul 2014
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VHF antenna height is important for decent range, especially if relying on a lower power hand held transceiver:

RANGE (nautical miles) = 2.08 x √ANTENNA HEIGHT (metres)

On my Honwave SIB, I use two mini Quick Fist clamps screwed to the transom which hold either just the Pacific Aerials Seamaster Pro 1m antenna connected via a modified rail mount base fitted on a rod, or this can be slotted into a multi-part folding awning pole for greater height and hence distance if required especially in the case of an emergency. When not in use, the folded awning pole sits in the side tube fuel line Velcro straps.

The fist clamps are also handy as a fishing rod holder when not using the aerial.
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Old 03 January 2017, 17:54   #13
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Country: UK - Scotland
Town: Port Logan
Boat name: Red Fox
Make: Zodiac Pro 500
Length: 4m +
Engine: Yamaha 70hp
MMSI: 232004329
Join Date: Aug 2002
Posts: 322
I fitted three of these through the transom in vertical line and a 1"x 1.5m stainless pole with a metz connected with a salty johns adapter. The pole fits tightly but is removeable so that it all goes in the garage. Seems to work a treat.
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Old 04 January 2017, 08:07   #14
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Country: UK - Scotland
Town: Denny
Boat name: Hebridean Storm
Make: Coastline
Length: 6m +
Engine: Honda 130hp
MMSI: 235107505
Join Date: Mar 2013
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Originally Posted by Kingsview View Post
RANGE (nautical miles) = 2.08 x √ANTENNA HEIGHT (metres)
However.....if the VHF you are communicating with has an aerial at the same height as your's (and it probably will have) you can double that range.
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Old 04 January 2017, 12:55   #15
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Country: UK - Scotland
Town: Kinghorn
Boat name: Onward
Make: Honwave
Length: 3m +
Engine: Mercury 2 st 15 hp
MMSI: 235913495
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Quote:
Originally Posted by Last Tango View Post
However.....if the VHF you are communicating with has an aerial at the same height as your's (and it probably will have) you can double that range.
Sorry, my bad as they say. You're right, I should have added:
Perform the calculation for BOTH vessels and then add the results for the
total theoretical range between them


Luckily, if putting out a Mayday call then the chances are the shore-based Coastguard antennae will be mounted up high - I gather for example that a lot of them along the Firth of Forth are piggybacked onto mobile phone masts.

However that can pose a problem as if they're atop a cliff and you are close to shore, then you may be in the 'shadow' as it were, since VHF depends on line-of-sight.

Not sure how this affects a DSC transmission, hopefully that would get through where a voice connection might not?
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Old 04 January 2017, 17:15   #16
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Country: Australia
Town: Dalmeny
Make: zodiac
Length: 5m +
Engine: outboard
Join Date: May 2015
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As I fish from my rib having my Ariel fixed to my centre console means I have clear acces around the boat.

As for range, mine isn't fixed to any poles or such and is just a 1.8m Ariel fixed using one of the many plastic brackets on the market. I fish sea mounts 50km offshore and still have contact with land due to the land bases are all high mounted on headlands.

With the repeaters up and down the coast I can talk to Sydney over 350km away.

Jon
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Old 05 January 2017, 08:09   #17
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Country: UK - England
Town: Flitch Green
Boat name: The Butt
Make: Ribtec 655
Length: 6m +
Engine: 200 HP Mercury
Join Date: May 2015
Posts: 88
Will decide when I am at the boat - either console or transom I will be using the folding bracket (which has arrived and looks very strong piece of kit) and a carbon fibre tube.

Am going to buy a 2.5m length and cut to length to suit when I get to the boat. Will probably add a further "C" clip (needs to be easy to undo) to allow fold down.

Carbon should look good and less weighty than 316 S/S.

Will posts pics when done!
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Old 25 January 2017, 07:36   #18
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Country: UK - England
Town: Flitch Green
Boat name: The Butt
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Engine: 200 HP Mercury
Join Date: May 2015
Posts: 88
Update - the bits are all here!

Hi All

The parts have all arrived so here are some pics - shows what I am planning and all pretty obvious I think.

Fixing to inside face of transom so it can fold into boat along deck next to the console/seats for transport. White stand off clamp to secure when vertical!

Only thing to add is that I am not relying on grub screws to hold the carbon tube - I have a hardwood dowel that will fit in the tube so I can use s/s screws. (the dowel will have hole drilled through to take the cable - screws will therefore not go all the way through!)

Anyway - you should get the gist of it!!

Cheers

Mode
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