SR 161 vs 162 question - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 06-14-2008
Senior Member
 
Join Date: Aug 2007
Posts: 306
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
thekeip is on a distinguished road
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
Reply With Quote Share with Facebook
  #2  
Old 06-15-2008
Senior Member
 
Join Date: Apr 2008
Posts: 476
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
negrini is on a distinguished road
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.
Reply With Quote Share with Facebook
  #3  
Old 06-15-2008
TomKeffer's Avatar
Junior Member
 
Join Date: Sep 2006
Posts: 22
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
TomKeffer is on a distinguished road
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.

-tk
Reply With Quote Share with Facebook
  #4  
Old 06-15-2008
Don Radcliffe
 
Join Date: May 2007
Location: Santa Cruz
Posts: 396
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
donradclife is on a distinguished road
Yes, my SR161 merges the GPS into its output stream.
Reply With Quote Share with Facebook
  #5  
Old 06-24-2008
SVAuspicious's Avatar
Mermaid Hunter
 
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 2,901
Thanks: 0
Thanked 50 Times in 41 Posts
Rep Power: 8
SVAuspicious will become famous soon enough
Quote:
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.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


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


All times are GMT -4. The time now is 04:12 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012