Good idea. I called Digital Yacht and they told me that the AIS units do NOT listen for standard DSC transmissions. The only reason they listen on CH 70 is that sometimes the USCG or other national authority can send messages specifically to AIS units on 70 to change channels or otherwise do something. So…that question is answered. It looks like any DSC position data it gets will have to come from the VHF. In the “while I am at it” spirit, I took the SSB home and took it apart. The RF gain and volume controls were horribly scratchy and the headphone jack intermittent at best. It really needed a good clean! The inside looks like it has been submerged. Note to self – there is a reason to spend the extra money on a marine SSB.
Joe Coquina C&C 35 MK I From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Frederick G Street via CnC-List Sent: Monday, October 30, 2017 11:18 AM To: cnc-list@cnc-list.com Cc: Frederick G Street <f...@postaudio.net> Subject: Re: Stus-List AIS improvement + general rewiring Joe — you should be able to identify what the DY AIS is doing by looking at the serial output via HyperTerminal on your laptop (assuming you have a way to get serial in, like an RS232 to USB adapter). — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Oct 30, 2017, at 10:03 AM, Della Barba, Joe via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: The old AIS was tested on my Sunday afternoon sail and got about 15 targets. It is now off the boat to be shipped to its new owner. The new one is on the way, a Digital Yacht AIT1500. So now I need to redo the various NMEA connections and the first thing I am trying to figure is the DSC-in signals. The VHF has a DSC-out and apparently the new AIS does too, but it does not seem to be documented. The manual mentions once receiver switches back and forth between DSC and AIS, but does not mention what sentences it sends out or on what outputs. My initial plan is to have the VHF DSC out go to the AIS NMEA in and then it can combine DSC messages it hears with whatever the AIS picks up. I am planning for now for the AIS to provide data for the nav computer and VHF, the cockpit plotter will get the AIS info from the AIS and GPS data either from its own receiver or the AIS unit, and the APRS will have its own low power GPS so I can turn everything off but APRS when I am not on the boat. More to follow, but that is plan so far. One frustration is for some reason the CP180 plotter will NOT take a GPS fix on any input but 4800 baud port 3, so even though the AIS will send all the GPS data along with AIS on 38K baud, the plotter won’t read the GPS sentences at that speed on ports 1 or 2. OpenCPN has no such restriction, so one connection will do for that. Joe Coquina C&C 35 MK I
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