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05 March 2021, 23:03
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#21
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Member
Country: UK - Wales
Town: Cardiff
Length: no boat
Join Date: Aug 2014
Posts: 2,018
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06 March 2021, 06:24
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#22
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Member
Country: UK - Scotland
Town: Kingussie
Boat name: Puffin
Make: NorthCraft / XS
Length: 5m +
Engine: Mariner 60
MMSI: 232019541
Join Date: Mar 2011
Posts: 81
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Quote:
Originally Posted by HDAV
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Well that’s easy for you to say. You did not get the email.
Those of us who did were very confused until PD so eloquently translated it for us
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06 March 2021, 18:36
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#23
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Member
Country: UK - England
Town: Somerset
Make: Takacat
Length: 3m +
Join Date: Jun 2018
Posts: 253
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I think it’s all about being too close to radiation, as it may fry your brain. Unfortunately, this advice came to late for me.
My advice would be not to poke the radio antenna in your ear, until further clarification arrives!
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06 March 2021, 21:57
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#24
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Member
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,304
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Quote:
Originally Posted by willk
I shall add that to my List of Things to Ignore.
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The first post was enough for me!
That thing is somthing else to ignore too....or at least the Doom Mongers eh!
Done and dusted ..move on...Life is too short..
"Frosty" is on it!
Afterall ..the Sunny uplands await ![thumbs up](https://www.rib.net/forum/images/smilies/thumbs.gif)
__________________
A clever Man learns by his mistakes..
A Wise Man learns by other people's!
The Road to HELL ..is Paved with "Good inventions!"
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09 March 2021, 20:07
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#26
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,109
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Quote:
Originally Posted by CUSAC
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So that confirms it, one for the floor mounted round filing cabinet.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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09 March 2021, 22:18
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#27
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Member
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 1,993
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Well that's a lot clearer. Good old RYA.
I like the idea of keeping a copy of the manufacturer's fitting instructions on board a RIB - no idea where mine are
I think on the calculator I need to have min 1.6m from antenna a base to nearest person of 1.6m. That is if my operating freq. is actually 156MHz - the icom manual isn't clear. The calculator spreadsheet's not exactly written in plain English either.
I no idea what EIRP is compared to ERP - all my manual says is the output is 25W - no ERP /EIRP info
I doubt the top of my A-Frame - highest & aft most part of the boat is more than 1.6m from my aft most jockey seat.
Does this mean my boat is now illegal, or in the interests of compliance I have to remove my fixed VHF - a vital bit of safety equipment -or can ONLY use it in emergency)? ![bang](https://www.rib.net/forum/images/smilies/banghead.gif)
how are normal people without degrees in electronic engineering or whatever meant to understand this? - I failed physics O level with a D
Oh, and why is the RYA incapable of spelling licen ce (noun) properly
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Member of the Macmillan Round the Isle of Wight Club
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10 March 2021, 08:11
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#28
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Member
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,304
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Quote:
Originally Posted by lakelandterrier
Well that's a lot clearer. Good old RYA.
I like the idea of keeping a copy of the manufacturer's fitting instructions on board a RIB - no idea where mine are
I think on the calculator I need to have min 1.6m from antenna a base to nearest person of 1.6m. That is if my operating freq. is actually 156MHz - the icom manual isn't clear. The calculator spreadsheet's not exactly written in plain English either.
I no idea what EIRP is compared to ERP - all my manual says is the output is 25W - no ERP /EIRP info
I doubt the top of my A-Frame - highest & aft most part of the boat is more than 1.6m from my aft most jockey seat.
Does this mean my boat is now illegal, or in the interests of compliance I have to remove my fixed VHF - a vital bit of safety equipment -or can ONLY use it in emergency)? ![bang](https://www.rib.net/forum/images/smilies/banghead.gif)
how are normal people without degrees in electronic engineering or whatever meant to understand this? - I failed physics O level with a D
Oh, and why is the RYA incapable of spelling licen ce (noun) properly ![bang](https://www.rib.net/forum/images/smilies/banghead.gif)
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Good ol RYA ![thumbs up](https://www.rib.net/forum/images/smilies/thumbs.gif)
__________________
A clever Man learns by his mistakes..
A Wise Man learns by other people's!
The Road to HELL ..is Paved with "Good inventions!"
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10 March 2021, 11:49
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#29
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Member
Country: UK - England
Boat name: Bluefin
Make: Ribcraft
Length: 5m +
Engine: 150hp
MMSI: Ex Directory
Join Date: Oct 2015
Posts: 347
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Quote:
Originally Posted by Pikey Dave
Marine VHF fixed sets are 25W
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Indeed, but the ERP (effective radiated power) at the antenna will be a calculation based on the loss of the coax (attenuation) and the gain ( above unity) of the antenna. Most RIB installations will use a quarter wave whip antenna which is unity gain, and RG58u coax which has a loss of about 0.23db/m at marine band frequencies.
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10 March 2021, 11:58
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#30
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,109
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Quote:
Originally Posted by gpsguru
Indeed, but the ERP (effective radiated power) at the antenna will be a calculation based on the loss of the coax (attenuation) and the gain ( above unity) of the antenna. Most RIB installations will use a quarter wave whip antenna which is unity gain, and RG58u coax which has a loss of about 0.23db/m at marine band frequencies.
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Just run that by me again in English [emoji6][emoji848]
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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10 March 2021, 12:15
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#31
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Member
Country: UK - England
Boat name: Bluefin
Make: Ribcraft
Length: 5m +
Engine: 150hp
MMSI: Ex Directory
Join Date: Oct 2015
Posts: 347
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Ok .... most rib installation will not be 25 ERP.
As an example, on my ribcraft the antenna is unity gain and it is fed with about 8m of RG 58u coax, so the cable loss is about 1.8db, therefore the erp of the antenna is not 25w, more like 15w (cant be arsed to do the calculation).
Also just to complicate matters further, the polar diagram of the antenna ( radiation pattern) will not be uniform.
TBH, I cant see ofcomm doing much on this as it would be an enforcement nightmare due to the technicalities involved.
It is not as simplistic as it looks.
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10 March 2021, 12:29
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#32
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,109
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Quote:
Originally Posted by gpsguru
Ok .... most rib installation will not be 25 ERP.
As an example, on my ribcraft the antenna is unity gain and it is fed with about 8m of RG 58u coax, so the cable loss is about 1.8db, therefore the erp of the antenna is not 25w, more like 15w (cant be arsed to do the calculation).
Also just to complicate matters further, the polar diagram of the antenna ( radiation pattern) will not be uniform.
TBH, I cant see ofcomm doing much on this as it would be an enforcement nightmare due to the technicalities involved.
It is not as simplistic as it looks.
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[emoji106] I think the general consensus is “do nowt”
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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10 March 2021, 12:43
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#33
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Member
Country: UK - England
Boat name: Bluefin
Make: Ribcraft
Length: 5m +
Engine: 150hp
MMSI: Ex Directory
Join Date: Oct 2015
Posts: 347
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Quote:
Originally Posted by Pikey Dave
[emoji106] I think the general consensus is “do nowt”
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Agreed.
The chances of enforcement action are little better than zero, I think it will be filed in ‘too difficult’ bin.
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10 March 2021, 17:09
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#34
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Member
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 1,993
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Quote:
Originally Posted by Pikey Dave
[emoji106] I think the general consensus is “do nowt”
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Yes, but I now where the "naughty" seat on the boat is
Any irritating / malcontented crew will be directed to the jockey closest to the antenna as I hail all and sundry
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Member of the Macmillan Round the Isle of Wight Club
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10 March 2021, 17:22
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#35
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Member
Country: UK - England
Town: Waterlooville
Boat name: Tickler
Make: Halmatic P22
Length: 6m +
Engine: Inboard Diesel 240HP
MMSI: 235115642
Join Date: Sep 2015
Posts: 1,777
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I wonder if you can use it to keep your pasties warm?
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10 March 2021, 18:30
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#36
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Member
Country: UK - England
Boat name: Bluefin
Make: Ribcraft
Length: 5m +
Engine: 150hp
MMSI: Ex Directory
Join Date: Oct 2015
Posts: 347
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Quote:
Originally Posted by GuyC
I wonder if you can use it to keep your pasties warm?
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Nah, nowhere near enough power.
I could post a picture of my thumb scar where I touched the wrong bit of a 10kw Transmitter 35 years ago, it blew a small hole in the end of my thumb which stopped at the nail. It smarted a bit (a lot) and made me jump ! 🙄😉
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10 March 2021, 19:31
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#37
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Member
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 1,993
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Quote:
Originally Posted by GuyC
I wonder if you can use it to keep your pasties warm?
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Is that a euphemism
__________________
Member of the Macmillan Round the Isle of Wight Club
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10 March 2021, 20:47
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#38
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,109
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Quote:
Originally Posted by lakelandterrier
Is that a euphemism ![Whistling](https://www.rib.net/forum/images/smilies/whistling.gif)
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He’d have to have a very short “antenna” [emoji6]
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: Don't feed the troll
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10 March 2021, 22:01
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#39
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Member
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 1,993
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Quote:
Originally Posted by Pikey Dave
He’d have to have a very short “antenna” [emoji6]
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Maybe that's an effect if he if got his EMF calculation wrong through erroneous EIRB earth matrix triangulation, and infringed the ERP safe distance paradigm radius due to syntax error on the co-ax attenuation curve parabola and the inverted polar mapping synchronisation.
Then I may be wrong on this
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Member of the Macmillan Round the Isle of Wight Club
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20 May 2021, 19:22
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#40
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Member
Country: UK - England
Town: Dorset
Length: 6m +
Join Date: May 2013
Posts: 159
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Another own goal from Ofcom. Final decision email with two broken hyperlinks needing them to send a second communication.......
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