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Navman Depth Sounder Transducer
I have a Navman Depth 3100 on my Azuli F40 Cat (Foam sandwich hull).
The transducer is mounted in-hull at a solid f/glass section near seawater intake.
The sounder has worked OK for about 11.5 years.
But recently the display started showing "- -" instead of the depth numbers.
I read that you could check that the sounder was sending a pulse to the transducer by using an old AM radio tuned to 200KHz and listen for a clicking sound to confirm that the sounder was sending the ultrasonic pulse.
I did this test and it worked. I could hear a clicking sound through the radio, when the sounder was powered on, the clicking would stop when I turned power off to the sounder.
Then I removed the transducer from the hull and put it in a bucket of water. The display started showing a reading. From this I assumed the transducer may be OK, but the interface to the full had been compromised somehow.
So then I cleaned up the transducer surface and the hull surface and reattached with SikaFlex.
Now it is just showing "- -" again.
Has anyone else had this experience?
Can anyone suggest another test to confirm the transducer is OK or not?