Two units, one transducer?

Chris Rennert wrote in news:4469fd27$0$76686$39cecf19
@news.twtelecom.net:

From what I have read, the Transducer produces too much data to ship
over the Lowrance-Net, so they say that is why you need the separate
transducer for each unit. I actually now have my boat prewired for the
Lowrance-Net, just waiting on my second graph to come in. One
transducer on the trolling motor, and another on the transom.


A fair enough description. If you think about what sonar is, a sound pulse
is sent off using a piezo element (or an array of elements), reflections
come back and are "transduced" by the same piezo device, so the wires that
activate the element and the wires that record the echo are often the same.
This happens at a pretty fast rate.

So, the onboard computer needs to reconstruct the signal coming back. It
needs to know what this signal is, and it needs to know what time the
activation signal was sent. I just don't see that a second unit would ever
know what time the first unit sent the activation pulse, and both units
would get garbled if the other unit weren't accounted for.

It would require major engineering to do what you want to do. It would
require semi-major engineering to just have a slave screen duplicate the
image on a second console. The cheapest, fastest approach would be to use
a cheap camera to take a picture of one unit and view it on a cheap monitor
on the other side of the boat.

Lowrance-net lets you send and receive data from many devices on the net
using one central computer. What the OP is trying to do is control one
device with two computers.

Unless you can buy a system like this off the shelf (and I'm pretty sure
you can't) I'd give up on the idea.

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Scott
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Scott Seidman wrote in
. 1.4:

Unless you can buy a system like this off the shelf (and I'm pretty sure
you can't) I'd give up on the idea.

Of course, if you only need to use one unit at a time, a switch box would
be a fairly easy solution, but you'd never be able to use both units at the
same time.

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Scott
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