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Old 19 September 2012, 05:26   #21
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Quote:
Originally Posted by gotchiguy

You would be able to do this however not really practical seeing as AIS range on a RIB is only 10nm absolute tops. Best thing to do is just program them all into your phone book on the drive at home
AIS range is going to be the same VHF voice no?

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Old 19 September 2012, 06:06   #22
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Quote:
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AIS range is going to be the same VHF voice no?

Sent from my portable speaking device using Rib.net
No I don't think so. Erin told me that between La Frette and MII you only see each other at 3nm....surely VHF range would be twice if not three times that?
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Old 19 September 2012, 07:25   #23
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Quote:
Originally Posted by gotchiguy

No I don't think so. Erin told me that between La Frette and MII you only see each other at 3nm....surely VHF range would be twice if not three times that?
I suspect it should be better than that and I plan on fitting a better aerial to see. Boat to base station is regularly over 30 nm.
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Old 19 September 2012, 12:16   #24
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We regularly pick up AIS signals over 35 miles away on our rib. Sometimes a lot more.
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Old 19 September 2012, 12:48   #25
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I think dsc is a fantastic system and I use it all the time. The problem is however that I think some radios are not user friendly and as such make it very time consuming to make dsc calls. I use it professionally between our vessels especially when talking business. It stops all those prying ears. One bug bear I do have is using coastguard stAtions for radio checks when a marina office, vts or another nearby vessel could be used instead
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Old 20 September 2012, 03:58   #26
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I use it professionally between our vessels especially when talking business. It stops all those prying ears.
How does it make your voice communications private?
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Old 20 September 2012, 07:24   #27
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How does it make your voice communications private?
it does not! only thing it stops is somebody switching to that ch. after hearing it being announced on ch. 16.

VHF Radio is for essential traffic only.

If you don't need to transmit don't transmit - either use mobile phone or PMR or Private Ch. for non essential conversations.

We all sign confidential agreements when we get out licence - since VHF is an open system.


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Old 20 September 2012, 09:00   #28
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Quote:
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CG stations have AIS - so can you point and click them?
Quote:
Originally Posted by gotchiguy View Post
You would be able to do this however not really practical seeing as AIS range on a RIB is only 10nm absolute tops. Best thing to do is just program them all into your phone book on the drive at home
Quote:
Originally Posted by martini
AIS range is going to be the same VHF voice no?
Not always - you'll probably be speaking to the Coastguard through a local repeater aerial - rather than the one on the watchroom roof - so direct AIS range and VHF range aren't the same thing.

That's why you can often hear the Coastguard talking clearly to someone on the other side of their patch - but you can't hear the reply (unless it's the rescue helo - which is different again!!).
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Old 20 September 2012, 14:18   #29
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Quote:
Originally Posted by Cookee

How does it make your voice communications private?
If I don't announce a working channel then only the vessel that I dsc knows what channel I will broadcast on. But then I suppose there are those muppets who scan every channel all the time as opposed to tag scanning useful channels.
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Old 20 September 2012, 14:38   #30
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Quote:
Originally Posted by gotchiguy

No I don't think so. Erin told me that between La Frette and MII you only see each other at 3nm....surely VHF range would be twice if not three times that?
Quote:
Originally Posted by Erin

I suspect it should be better than that and I plan on fitting a better aerial to see. Boat to base station is regularly over 30 nm.
I had always assumed that AIS range would be the same as VHF since you are using the same system with same antenna etc but thinking more about it prompted me to check what sort of power AIS systems transmit at, I always assumed it was the standard 25W.

Most manufacturers don't seem to advertise this in there specs but a standard has been set, for class A systems the output is only 12.5W and for class B it's a measly 2W.

This would explain why 2 ribs with class B and comparatively low antennas don't see each other until fairly close.

But then it wasn't designed for seeing where your mates are at, it's for collision avoidance so the range doesn't need to be huge.

Apologies for drifting the thread from DSC to AIS but thought it was worth a mention in case others hadn't realised the limited power.
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