SR 161 vs 162 question - SailNet Community
LinkBack Thread Tools
post #1 of 5 Old 06-14-2008 Thread Starter
Senior Member
Join Date: Aug 2007
Posts: 306
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
SR 161 vs 162 question

I know that the Smart Radio SR 162 receiver allows a GPS data stream at 4800 bpi to be merged with the AIS stream at 38.4 kb (at least I think I know that), for transmission to the Vesper Watchmate display. The question I have is, does the 161 do the same? I can't find much in the way of related documentation.
Howard Keiper
thekeip is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 5 Old 06-15-2008
Senior Member
Join Date: Apr 2008
Posts: 476
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Send a message via AIM to negrini Send a message via Yahoo to negrini Send a message via Skype™ to negrini
Both are class A AIS. It means these are receive only, so you can plot it into your chartplotter. As far as I know, only 162 can mix a GPS input at a different baudrate, and provide its NMEA sentence at the standard 38Kbps output (161 has a one single DB9 output), but that's not a problem if yor plotter has more than one serial input. Until now, FCC has not issued approval for Class B AIS in US waters, what people in the market just cannot believe how lazy they are for that. Class B will allow you to send AIS information as well, making you visible to other vessels too. Unless you have already one of them (162 is dual channel) I'd give up SRs, and wait for FCC approval to install a full Class B AIS.

Last edited by negrini; 06-15-2008 at 01:31 AM.
negrini is offline  
Quote Quick Reply Share with Facebook
post #3 of 5 Old 06-15-2008
Junior Member
TomKeffer's Avatar
Join Date: Sep 2006
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
According to the manual that came with my SR162, both have the ability to merge a 4800b stream with the AIS data, putting out 38.4kb. The only difference between the two is that the SR162 has a two-channel receiver, so it can get information from both AIS channels simultaneously.

TomKeffer is offline  
Quote Quick Reply Share with Facebook
post #4 of 5 Old 06-15-2008
Don Radcliffe
Join Date: May 2007
Location: Santa Cruz
Posts: 396
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 11
Yes, my SR161 merges the GPS into its output stream.
donradclife is offline  
Quote Quick Reply Share with Facebook
post #5 of 5 Old 06-24-2008
Mermaid Hunter
SVAuspicious's Avatar
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 5,687
Thanks: 0
Thanked 274 Times in 246 Posts
Rep Power: 11
Originally Posted by negrini View Post
Both are class A AIS.
Class A AIS units are for large commercial platforms (I don't remember the threshold, but it might be 100 GT inspected). Each Class A AIS transponder consists of one VHF transmitter, two VHF TDMA receivers, and one VHF Digital Selective Calling (DSC) receiver. Class A transponders cost about 3500 USD.

Class B is a spec for smaller craft that -- among other deratings -- updates more slowly. Currently, the FCC has not certified any Class B AIS units in the United States despite pressure from the USCG, marine manufacturers, and individuals.

The SR 161 and SR 162 are receive only devices that do not drop into either Class A or B categories since they are receive-only units. They are great bits of kit if you have a chartplotter than can interpret the NMEA sentences from them, but they aren't transponders.
SVAuspicious is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Dumb Winch Question jimmiebuchanan Learning to Sail 17 09-07-2007 01:59 PM
Ladder question mcain Gear & Maintenance 14 08-03-2007 10:28 PM
anchoring question rperret Seamanship & Navigation 24 07-18-2007 09:28 PM
a question of experience - and Boat size youngfamily General Discussion (sailing related) 6 07-05-2007 09:16 AM
racor question rperret Gear & Maintenance 8 06-19-2007 01:18 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome