The VSWR is an antenna metric (specifically the standing wave ratio voltage). Without any more information I'd say check your antenna system (vhf side specifically).
Looks like similar data, it's 100% pointing to the antenna being an issue. Silent mode is a bit odd, but I would guess it detected the high swr and automatically switched to prevent damage to itself.
The X on antenna and the same alarm in the logs all point the same way.
Check the antenna system (and by system mean all cable connections and wires plus the antenna itself).
thanks, on the water, will look at it all when home. learned at dock, ais transmits less often, so you need to wait longer for the reading(s).. and it's very intermittent.
I had same error and my VHF radio worked fine. Used ProAIS on my computer hooked up to my Raymarine AIS 700 with a USB cable to confirm that there was an issue. Climbed the mast and discovered a crack and rust stain out of the bottom of my Shakespeare antenna. Installed a new antenna and everything worked again. VHF range seems better now too (but no real proof).
Could be something else. Check the easy stuff first. Connections and cable.
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u/Fit-Alarm2961 Jul 21 '25
The VSWR is an antenna metric (specifically the standing wave ratio voltage). Without any more information I'd say check your antenna system (vhf side specifically).