Connecting 170kHz depth transducer to Raspberry Pi

[robifz]

I have an old B&G Depth Transducer.
It has a 3 wire cable. Red wire, Blue wire and Shield
I would like to connect this to a Raspberry Pi to then read the depth
The transducer transmits data using 170Khz analog signal

Any suggestions how I can do this?

[abarrow]

There is an interesting discussion here https://forum.arduino.cc/t/interfacing-f.../27?page=2 from someone reverse engineering a depth sounder.

The bottom line is that unless the sounder is actually "smart", you are going to need a circuit that generates the pulse and receives it. Since this is an old model, I think it's unlikely that it is anything more than a transmitter and receiver, needing something else to generate, receive, and interpret the pulses.

[bergie]

There is this piece of kit that can drive many old depth sounders and turn them into NMEA0183:
https://actisense.com/products/dst-2-nme...ransducer/
Shouldn’t be too tricky to go from there to RPi.

I just received mine, so I haven’t had the the to plug it in yet. The plan is to digitise our old NASA depth sounder (I bought the DST-2-150 because of this) and VDO Sumlog paddle wheel sensor.

[abarrow]

This looks very interesting. Please let us know how it works for you.

It's too bad they aren't interfacing to NMEA2000!