Reply
 
Thread Tools Search this Thread
 
Old 08 April 2015, 05:36   #1
Member
 
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
Vhf aerial no A frame

Any idea for a vhf aerial for rib with no A frame?
__________________

__________________
Red Fox is offline   Reply With Quote
Old 08 April 2015, 05:59   #2
Member
 
steco1958's Avatar
 
Country: UK - England
Town: West Bromwich
Boat name: Ellie V
Make: Excel Voyager 520
Length: 5m +
Engine: Evinrude 75 HP
MMSI: 235 908 287
Join Date: May 2012
Posts: 680
You will either have to use a transom mount, or if you have a console, attach to that.
__________________

__________________
steco1958 is offline   Reply With Quote
Old 08 April 2015, 06:08   #3
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
I'd put a pole mount on the transom
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 08 April 2015, 10:28   #4
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,121
Only if you limit power to 5 watts...

25 watts through most VHF antennas without an A-frame to add to the distance exceeds permissible radiation limits in most countries. Basically, you'll microwave yourself / passengers with the output.

However, yes, the idea of a tilting mount on the transom does work perfectly. Keep in mind that VHF is line-of-sight. Height is might.
__________________
Richard
Gluing geek since 2007
office888 is offline   Reply With Quote
Old 08 April 2015, 12:28   #5
Member
 
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
Gulp... Microwave? If I wrap bacon round it then this could be a new way of cooking. So a mounting pole up to chest high then the aerial on that and all should be well? Looking at the cuddy fishing boats round here the aerials start at face height. No wonder their captains have that burnt face look.
__________________
Red Fox is offline   Reply With Quote
Old 08 April 2015, 14:30   #6
Member
 
Nasher's Avatar
 
Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,147
Have a search for old threads by Hightower, I'm sure he built a really nice folding pole for his antenna to mount on.

Nasher.
__________________
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club
Nasher is offline   Reply With Quote
Old 08 April 2015, 15:56   #7
Member
 
Ovey's Avatar
 
Country: UK - England
Town: Portsmouth(ish)
Boat name: Wings
Make: Ribeye
Length: 6m +
Engine: Yamaha F115 AETL
Join Date: Oct 2013
Posts: 615
RIBase
Vhf aerial no A frame

At 25W the safe distance from the antenna is around 1m away. This is effectively a large baked bean can placed over the antenna with a 1m radius from the antenna.

Anything closer and you risk warming effects on the tissues of your body if you stand closer for any length of time. The long term effects haven't been fully determined yet. And this is non-ionising radiation (think water boiling), not ionising (think nuclear).

I create transmit system safe distance reports for a living after many years as a communications engineer in the navy!




Sent from my iPhone using RIB Net
__________________
There's weather out there - must be time to RIB!

(Or dive, or ref rugby, or.......)
Ovey is offline   Reply With Quote
Old 08 April 2015, 16:58   #8
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,928
RIBase
Quote:
Originally Posted by Red Fox View Post
Gulp... Microwave? If I wrap bacon round it then this could be a new way of cooking. So a mounting pole up to chest high then the aerial on that and all should be well? Looking at the cuddy fishing boats round here the aerials start at face height. No wonder their captains have that burnt face look.
The world is full of wee boats with antennae mounted on handrails - they don't transmit much so I'd imagine those skippers are just embarrassed at getting spotted in cuddy boats
__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 08 April 2015, 17:19   #9
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
Quote:
Originally Posted by Ovey View Post
At 25W the safe distance from the antenna is around 1m away. This is effectively a large baked bean can placed over the antenna with a 1m radius from the antenna.

Anything closer and you risk warming effects on the tissues of your body if you stand closer for any length of time. The long term effects haven't been fully determined yet. And this is non-ionising radiation (think water boiling), not ionising (think nuclear).

I create transmit system safe distance reports for a living after many years as a communications engineer in the navy!




Sent from my iPhone using RIB Net
Ah, now I understand Tara slightly more: http://i.dailymail.co.uk/i/pix/2013/...6_634x1112.jpg

I wonder if your 1m safe distance is based on dose and so has a temporal element?
__________________
Poly is offline   Reply With Quote
Old 08 April 2015, 17:37   #10
Member
 
spartacus's Avatar
 
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: 3,270
RIBase
My bespoke stainless steel light pole and Metz antenna.

Hmmm, shiny!
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	140
Size:	81.3 KB
ID:	104279  
__________________

__________________
Is that with or without VAT?
spartacus is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 14:18.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.