Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 21-01-2012, 18:41   #16
Registered User

Join Date: May 2010
Location: Elsewhere on the Water
Posts: 571
Re: Receiving AIS signal?

gleff,

Good luck with your project.

You should read through the information here: Cover your Area on the Live Navigation Map. It is from MarineTraffic.com and covers information on AIS antennas, and equipment to become a base station to support their system. Sydney already has quite a bit of coverage, but it may be helpful to you for your own objectives because it discusses improving signal reception.

Also, there was a notion in an earlier post that base stations may act as repeaters. I do not think that is the case. I think that they receive AIS signals, and put the data on the internet, or in the case of vessel traffic systems, collect it for traffic controller displays.
__________________

__________________
St. Elsewhere is offline   Reply With Quote
Old 23-01-2012, 02:23   #17
Registered User
 
gleff's Avatar

Join Date: Jan 2012
Location: Sydney, Australia
Posts: 9
Re: Receiving AIS Signal ?

Okay.. I have an update... I got my new antenna about an hour or so ago. I plugged it in, through it out on the balcony next to the bbq (not mounted on the railing), and proceeded to tune into the AIS frequencies on the SBS-3 virtual radar. In AM mode where I was expecting to hear transmissions (blips, pops, etc) were non existent.. although I was picking up loads of harmonics of voice stations around. I then put it on FM which is where it needs to be to decode AIS and again, heard absolutely nothing but static.

Thinking the entire situation was a waste, I loaded up shipplotter.. pressed start (didn't configure anything), and looked at the message section.

LOW AND BEHOLD.. I'M DECODING AIS MESSAGES!!!!!!!!!!!!!!!!!!

Preliminary findings is that it's a bit flakey and i'm getting around 5nm in distance but this is rather expected. I may be able to improve on this by changing the cable, and mounting the antenna properly on the railing.

Here are a few messages I've received so far.

311513000;moored ;000'; 0.0kt;33.861105S;151.200288E;176.0;176;30s;12012 3 081028;audio[3]
503601000;under way ;000'; 0.0kt;33.860917S;151.210200E; 0.0;194;14s;120123 081112;audio[1]
503042600;unknown ;000'; 0.0kt;33.807418S;151.248843E;149.2;511;37s;12012 3 081135;audio[18]
503344800;under way ;000'; 3.7kt;33.856950S;151.196033E;156.4;158;49s;12012 3 081147;audio[3]
311513000;(9247144);(C6SW3 );SEVEN SEAS VOYAGER ;Passenger ;-> Jan23 17:45 SYDNEY ;205 28 7.0 11 14;120123 081253;audio[5]
351607000;moored ;128'; 0.0kt;33.969198S;151.210958E; 0.1;254;03s;120123 081303;audio[3]
503344800;under way ;129'; 8.0kt;33.860883S;151.197450E;158.1;157;36s;12012 3 081334;audio[3]
503344800;under way ;129'; 7.9kt;33.861550S;151.197800E;156.3;154;56s;12012 3 081354;audio[3]
503075000;under way ;128'; 0.0kt;33.855943S;151.189013E; 0.0;511;23s;120123 081421;audio[1]

The bottom line is I'm able to pick up AIS signals.

Woot. I'll have a ball with this on the weekend now.

Thanks to everyone for their input in the thread.
__________________

__________________
My Flighttracking website: http://flighttracker.gleff.com
gleff is offline   Reply With Quote
Old 23-01-2012, 03:32   #18
Registered User

Join Date: Sep 2009
Location: Luebeck, Germany (baltic coast)
Boat: Ruegenwerft MY 30ft
Posts: 37
Images: 2
Re: Receiving AIS Signal ?

Quote:
Originally Posted by gleff View Post
Okay.. .... LOW AND BEHOLD.. I'M DECODING AIS MESSAGES!!!!!!!!!!!!!!!!!!
shure, a good antenna ist the best way to good results. If u are satisfied - dont touch anything and enjoy! If u are looking for more - what about ur receiver? I use the ICOM PCR1000 - 1.choice what ever u want to monitor. There are several preamplfiers on the market - most are no worth a single buck! The enhance signallevel and noise - u have to enhence signal not the noise. Look for splitter(?) from a old DUPLEX VHF (maritime) radio. Maybe difficult to find, but it cuts down all the noise - except from the desired frequencies. Bandwidth is about 5 Mc, these radios transmit in the lower (157 Mc) at 25W and receive on upper (162Mc). Connect ur AIS to upper band, your VHF Voice receiver (if any) to lower.
__________________

__________________
christian.kautz is offline   Reply With Quote
Reply

Tags
ais

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Problem with AIS taku OpenCPN 4 03-10-2014 10:17
New SiiTech AIS Reporting System For Yachts sinbad7 Marine Electronics 36 05-08-2011 07:51
Getting AIS rs-422 Signal Out to the iPad PeregrineSea Navigation 3 26-07-2011 09:52
Route Properties, Missing Functions James Baines OpenCPN 13 13-07-2011 05:31
AIS Reception Issue twistedtree Marine Electronics 72 03-07-2011 04:57



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:59.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.