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Multiple NavNet displays with one GPS antenna

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Multiple NavNet displays with one GPS antenna

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Old 03-24-2004, 10:21 AM
  #1  
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Default Multiple NavNet displays with one GPS antenna

I am adding a second NavNet display (1710c/NT) to my current 1823c/NT display and I was wondering if it is possible to connect a single GPS antenna (BBWGPS) to both units via a junction box.



I know that I can receive position and heading information via the network NMEA interface from the 1823c/NT, but for redundancy purposes I would prefer that I could operate each unit's chart plotter independent of the other being functional.



I do not see mention of this configuration in the manuals, whereas they do mention a single antenna connected to one unit and the second unit getting position data via NMEA on network, or that you can have a dedicated antenna for each.



Does anyone know the answer to this? Thanks.
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Old 03-24-2004, 11:45 AM
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Default RE: Multiple NavNet displays with one GPS antenna

In theory there is no reason you could not do this by using a double throw toggle switch with multiple terminals (if you can find one). The leads coming from the GPS sensor inside the cable are basically power, switching, and data in and data out. You would need another cable with the requisite 7 pin plug for the "Data 1" port. I would worry about increasing the potential for failure by putting a switch in the line between the sensor and the plug.

If you really want belt and suspenders, it might be worth spending the couple of hundred bucks extra to get another BBWGPS. You could also get a Garmin 17N sensor, which is cheaper ($150 or so I think), but then you would have to spend $35 for the Furuno interface cable with plug that is included with the BBWGPS.

Do you have another GPS source already? You could just connect it to the new display head via one of the NEMA connections and then change the NAV data source settings to NMEA. I have an 1833C and a Garmin 2006C. The NMEA output from the Garmin is connected to the 1833C but normally not used. If I needed to, however, I could change the NAV source on the 1833C to NMEA and it would use the Garmin instead of the BBWGPS that is hooked up to it.
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Old 03-24-2004, 01:30 PM
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Default RE: Multiple NavNet displays with one GPS antenna

Saltdog,

Thanks for the input, but I wasn't thinking about using a switch. My GPS already goes to a terminal block to which my 7 pin cable connects tp port 1 on my 1823 unit, and to that terminal I want to also connect the cable from my 1710. In other words, I'd have a single GPS antenna feeding both units all of the time. I'm not opposed to spending the extra money for another antenna if that is what I have to do in order to have totally rundandant chart plotters, but I feel that the likelyhood of the GPS antenna failing is close to zero - so why spend the money for another, and most important to me, the time to rig another one on the T-Top.
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Old 03-24-2004, 05:29 PM
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Default RE: Multiple NavNet displays with one GPS antenna

I think you could probably connect the cable from the second display to your terminal block, though you probably only want to connect in parallel the NMEA out leads, not the power leads. Perhapsyou could rig them up so you could attach them quickly if the other unit faild in such a way as to stop powering the GPS module

It's probably worth your while to call Furuno tech support and ask in case something bad could happen from the interconnection (though I doubt it's a problem if all you use is the data out onthe second unit). They are pretty helpful and knowledgeable in my experience.
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