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Old 17-07-2021, 15:14   #1
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NAIS 500 AIS Transceiver Won't Transmit

I just installed a brand-new B&G (Simrad) NAIS 500 Class-B AIS transceiver after the last one fried. It's connected to a NSPL 400 VHF antenna splitter. This configuration worked great with the old unit. Everything checks out with the new unit, and it receives AIS messages, but it has yet to transmit. When I run the system configurator, it shows the unit to be waiting for a GPS fix. The dedicated GPS antenna is fine and connected, and the NAIS 500 appears to see satellites. But it won't get a fix.

I tried cycling power a few times. Every once in a while the old unit would stop transmitting for the same reason, and that would resolve it, but not this time.

Note that I installed it on a very cloudy / rainy day. Is it possible that this is the reason? The GPS antenna is one of those deck-mounted mushrooms (provided with the NAIS 500).
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Old 18-07-2021, 01:53   #2
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Re: NAIS 500 AIS Transceiver Won't Transmit

Sounds like it’s not getting enough signal or seeing enough satellites to get a fix

Reposition the antenna temporarily outside to verify
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Old 03-06-2023, 19:12   #3
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Re: NAIS 500 AIS Transceiver Won't Transmit

Was this ever resolved?
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Old 03-06-2023, 20:35   #4
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Re: NAIS 500 AIS Transceiver Won't Transmit

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Originally Posted by SilentOption View Post
Was this ever resolved?
Thanks for checking in. I moved the GPS antenna to be closer to the unit, eliminating the cable extension. This seems to help. But there are still times when the system intermittently stops transmitting, claiming no GPS fix. That’s a continued cause of frustration.
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