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Old 20-02-2024, 08:01   #1
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Join Date: Oct 2007
Location: Kelowna , British Columbia
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NAIS 500 not transponding

Hello cruisers! I have been having this problem for almost a year now . My AIS suddenly stopped transponding last year for no particular reason . I can see all the traffic around me for miles, but nobody can see me , unles you are no more than a 100 feet from me. . The antenna was new 2 years ago, and so was the splitter. I by passed the splitter, no change. I took it to the local marine electronic store and they think the gizmo it’s fine, but it’s still not transponding. Check the connection at the base of the must and everything looks fine, not a slightest sign of corrosion. Any suggestions?o
henryk is offline   Reply With Quote
Old 21-02-2024, 18:11   #2
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Re: NAIS 500 not transponding

plug your computer into it and see what its' doing.

there is only 2 reasons an ais will receive but not transmit. one is no gps pos, and the 2nd is high ant swr, you will see the data from both on the ais software

if people can see you 100' away it's not the gps. and most likly the antenna.
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Old 21-02-2024, 20:07   #3
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Re: NAIS 500 not transponding

Quote:
Originally Posted by smac999 View Post
if people can see you 100' away it's not the gps. and most likly the antenna.
Antenna, and or antenna cable, probably more likely the cable. Was the cable replaced with the antenna? Does the antenna install have a connection at the top of the mast? If yes, I'd bet a beer that that's the source of your problem. The can be tough to waterproof properly, and coax cable just HATES water...
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Old 21-02-2024, 23:04   #4
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Re: NAIS 500 not transponding

Do you have access to an emergency VHF antenna to test, they are about $70 and probably should carry one anyway.
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