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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics > AIS-B questions
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Thread: AIS-B questions Reply to Thread
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Topic Review (Newest First)
05-08-2012 01:52 PM
jackdale
Re: AIS-B questions

Quote:
Originally Posted by jrd22 View Post
xy-I was thinking more in terms of single handed and needing the ship to avoid you if you weren't awake to take evasive action.
This could start one of those nasty ColRegs Rule 5 debates.
05-08-2012 11:37 AM
jrd22
Re: AIS-B questions

xy-I was thinking more in terms of single handed and needing the ship to avoid you if you weren't awake to take evasive action. Glad to hear your range was so good from the stern rail, I would rather go that route than use a splitter.
05-08-2012 01:40 AM
xymotic
Re: AIS-B questions

Quote:
Originally Posted by jrd22 View Post
I don't know how much range is needed, but generally more is better, no? A ship traveling at 22 knots at 8 NM range will give you about 20+- minutes until impact. But perhaps more importantly if you show up on their AIS when they are 20+ NM away there is a better chance that someone on the bridge will notice you sometime during that hour.
Yes, more is better, BUT... on my last boat I regularly got 20 miles and my record was sixty, and that was a simple antenna mounted on the stern rail. Regardless, 8 would be a MINIMUM I'd expect from any AIS antenna, and yeah, if you have 20 minutes notice and still can't avoid another vessel, AIS is not going to be the thing that saves you from yourself.
05-07-2012 11:33 AM
jrd22
Re: AIS-B questions

I don't know how much range is needed, but generally more is better, no? A ship traveling at 22 knots at 8 NM range will give you about 20+- minutes until impact. But perhaps more importantly if you show up on their AIS when they are 20+ NM away there is a better chance that someone on the bridge will notice you sometime during that hour.
05-07-2012 02:10 AM
xymotic
Re: AIS-B questions

And, how much range do you need for AIS? 8 or 9 miles is not enough to avoid a massive ship?
05-06-2012 08:09 PM
SVAuspicious
Re: AIS-B questions

Quote:
Originally Posted by jrd22 View Post
... but the gain in range by having the antenna at the top of the mast vs. 8'+- off the water is considerable.
Not so much. You'll be surprised.
05-06-2012 06:40 PM
jrd22
Re: AIS-B questions

Thanks for all the replies, and good advice.
SVAuspicious- I tend to agree with keeping systems separate but the gain in range by having the antenna at the top of the mast vs. 8'+- off the water is considerable. I'll have to do some more thinking about this.
05-06-2012 01:30 PM
SVAuspicious
Re: AIS-B questions

Splitters are fundamentally bad, bordering on evil. You can make them work but the implications are really ugly. Reduced receive sensitivity, failure modes that can fry all your gear that share the antenna, missed packets, reduced transmit range, ...

Do yourself a favor and stick a dedicated AIS VHF antenna somewhere easy and convenient, like the pushpit.
05-06-2012 09:17 AM
alturia
Re: AIS-B questions

A number of companies make VHF/AIS antenna splitters and their web sites provide quite a bit of information. Some of them have built in features that aid in any troubleshooting, such as Vesper Marine.

Antenna Splitter for Class B AIS Transponders
05-04-2012 07:38 PM
xymotic
Re: AIS-B questions

Quote:
Originally Posted by stiffwind View Post
And do these splitters work when your VHF is already connected splitters box with am/fm radio?
Dude! Run another antenna!

**IF** you make it work, it will be a disaster to troubleshoot WHEN it fails, and this is not something to mess around with.
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