Originally Posted by jyasaki
50kHz/200kHz. You're not running a microwave
Microwave...:-) I knew that...
So, been out again today...all the settings on the 550s that can be at 'Auto' are at 'Auto' and the transponder is well and truly stuck down. The hull is squeaky clean. The 'Auto' setting is where the 550s has always been.
Tried various manual settings: no change.
Changed frequencies: no change.
The 'Gain' was set at 70%...I upped this to 90% - thinking gain might equate to signal strength - and all was fine for about 30 mins and then flashing mode came back and nothing I did could take it out of that mode, including a restart.
So...no further forward. One other change point comes to mind though. The transponder is on centreline in the transom well. Since last use in August we've had a full length keel guard fitted and so the transponder now has to 'see' through the keelguard. I know the keelguard will attenuate the signal but we're not the only RIB in the world with a full length keel guard so I can't think this is the issue.
I'm batting a variation of this post off to Garmin Tech Support to see what they say. Still interested in any other opinions though please