myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website

Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world.

Forum Home Forum Home > Hints and Tips > 575/588
  New Posts New Posts RSS Feed - AIS Transmission issue
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

AIS Transmission issue

 Post Reply Post Reply
Author
Message
Ellipsis View Drop Down
Sub Lieutenant
Sub Lieutenant


Joined: 25 January 2021
Location: Aruba
Status: Offline
Points: 5
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ellipsis Quote  Post ReplyReply Direct Link To This Post Topic: AIS Transmission issue
    Posted: 25 January 2021 at 15:40
Hello all I am a new Hanse owner 2016, 575.. I picked up the boat in Curacao and have been sailing the Dutch Antilles, I have been having a problem with my AID NAIS 400 , I updated the software on the unit and reprogrammed the proper vessel info.. But apparently every time I get a little off shore maybe 1/2 kilometer the unit cuts out and stops transmitting, I have no problem receiving and seeing other vessels but I disappear until I get close to land again..  I know that there is only on antenna on the mast and I am sure it shares the VHF signal, I was told the problem could be could be that I have a 50 OHM cable and not a 100 Ohm cable... ,Anyway the boat is a 2016.. Open to suggestions or if anyone else had this problem 

Mike
Back to Top
High Time View Drop Down
Vice Admiral
Vice Admiral


Joined: 04 September 2012
Location: Portsmouth UK
Status: Offline
Points: 758
Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 16:04
Why do you believe the "unit cuts out and stops transmitting"? Have you checked with a nearby boat when you're away from shore?
It seems more likely that you are transmitting a weak signal, probably due to antenna issues. 
Is your antenna good for VHF transmission - say more than 10 miles to another boat (not to a more powerful shore station)? 
Is there an active splitter in the antenna line that properly shares the antenna between the VHF and AIS? If there is, maybe it's faulty?
One solution is to fit a separate antenna for the AIS on the stern rail, or a separate pole at the stern. Height is not essential for the AIS antenna and a second antenna gives you redundancy in case the mast antenna fails (or the mast falls down!).
Roger

High Time (415 #038)
Back to Top
Ellipsis View Drop Down
Sub Lieutenant
Sub Lieutenant


Joined: 25 January 2021
Location: Aruba
Status: Offline
Points: 5
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ellipsis Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 16:12
The VHF transmits and receives fine, so yes I am suspect that the splitter by the nav station is part of the issue.. And I was told that I could use a separate antenna, but if I can fix this issue without having to mount a separate antenna that would be a better solution.. 
Back to Top
Arcadia View Drop Down
Commander
Commander
Avatar

Joined: 27 November 2017
Location: Sag Harbor, USA
Status: Offline
Points: 133
Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2021 at 17:46
Hi mike.  Try bypassing the splitter and running the mast antenna directly to your AIS temporarily.  Do it next time you’re  offshore and you can use marine traffic to verify transmission. 
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
Back to Top
Black Diamond View Drop Down
Rear Admiral
Rear Admiral
Avatar

Joined: 24 October 2015
Location: Newport, RI, US
Status: Offline
Points: 601
Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 01:32
I agree..   Its more than likely you are transmitting a weak signal.     You can check on MarineTraffic.Com or some other web site,  or just ask another boat if they see you.     

Now, prefacing what I am about to say with the announcement that I have not done it yet on my 575,   I never liked the idea of sharing the antenna.   I'm sure it works fine 99.999% of the time, but on my prior boats I always put a second VHF antenna on the stern (or wherever).   If the masthead antenna got fried I had a backup antenna.   I could just pull the cable and connect it to the VHF if needed.    It also eliminated the remote chance of conflict.   Its a sailboat,  and given they don't go very fast,  its not going to broadcast a signal as often as a powerboat going 25kts.   Still....

Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
Back to Top
Wayne's World View Drop Down
Rear Admiral
Rear Admiral
Avatar

Joined: 18 July 2012
Location: Cruising
Status: Offline
Points: 741
Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 13:00
Mike, 

Good to see you are in Aruba. We had a similar problem and I removed the splitter and had it checked by a "tech" in Greece who said it was faulty. I bought a new splitter and replaced it and still had the same problem. In the end I took the chance and bought a new AIS unit and fitted same and the system then worked perfectly. Our AIS unit was about 3.5 years old when it had problems - just out of their 3 year warranty. Good luck.
Wayne W
Cruising, currently in the Caribbean and will head across the Pacific early 2023
Back to Top
Ian Coverdale View Drop Down
Lieutenant
Lieutenant


Joined: 19 June 2019
Location: SW England
Status: Offline
Points: 32
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian Coverdale Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 18:34
Possible your splitter has been zapped by nearby lightning discharge.


Ian & Andrea
SV Gabrielle (H445)
Portishead, SW England.
Back to Top
Arcadia View Drop Down
Commander
Commander
Avatar

Joined: 27 November 2017
Location: Sag Harbor, USA
Status: Offline
Points: 133
Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2021 at 19:51
Maybe you should check the range on your VHF transmission while you’re at it.  People may be receiving you but maybe not at long range.
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.117 seconds.

Links : www.hanseyachts.co.uk www.hanseyachts.com www.fjordboats.co.uk www.dehler.co.uk www.varianta.co.uk