Lloyd Sumpter wrote:

Hi,

I still have the thru-hull from a long-dead knotmeter in Far Cove. I
may be able to dig up the partially-working paddle-wheel sender (iirc
needs a new paddlewheel).

Can I get a new sender, with proper documentation so I know how it
works, and hook it into my laptop? The Signet sender appears to put out a
voltage more-or-less proportional to speed, correct? So I would need a bit
of electronics (buffer/amp? and A/D) to put the value into the parallel
port of the laptop. Then a few runs with a GPS in still water should allow
me to calibrate it.

Where can I get data on what these senders actually put out?

Lloyd Sumpter
"Far Cove" Catalina 36 - waiting for new engine


Sheesh, Lloyd, why don't you plumb that through-hull and add something
useful, like a baitwell?

Knotmeter...whyfor? You have a main GPS working of your mains, and a
backup GPS that works off its own little batteries, right?

Just interface one of the GPS units with your laptop.



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