NASA EML-3 Interfacing

[Alpha22]

I have an existing log instrument that I would like to replace the paddlewheel transducer with a NASA EML-3 unit.
The existing unit is a Silva Sea Data Star Dual Log and depth, which I really want to retain, but would like speed through the water.

The Silva uses a NEXUS log transducer I believe.

The million dollar question is - Will the EML-3 drive the Silva head unit? The EML-3 has a choice of high voltage pulses and low voltage pulses.... but nowhere can I find any info about the Silva.

I suspect there is a fair chance it will work.... but I will only find out after fitting the new transducer and trying it out.... it could be an expensive experiment.

 

[syTaika]

I'm planning to replace my Silva Nexus log transducer with an Arduino and a GPS shield. The old Nexus server is able to use alternatively the GPS data from the NMEA input to display the speed, but it is not able to use the GPS speed for true wind computation. Therefore I need to emulate the log transducer and feed pulses to the LOG input of the server instead. We have no tidal currents in Finland, so using speed over ground is fine for this purpose.
I found a Nexus service manual in internet and it tells that the pulse from the log transducer is 5V and there are 12964 pulses per Nautic mile. 5 volts seems to be OK for NASA EML-3, but 12964 pulses per NM is out of the adjustable range of 15000 to 25000.
So it seems that EML-3 wouldn't work correctly in case your log transducer is similar to mine.