4 Jun
2013
4 Jun
'13
2:22 p.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of Dave McGuire
Sent: Tuesday, June 04, 2013 10:28 AM
To: On-Topic and Off-Topic Posts
Subject: Re: [cctalk] ancient marine electronics
On 06/04/2013 12:24 PM, Bert Thomas wrote:
Yes, I used to work in marine electronics, many moons ago. The transducer was nearly
always duplexed, i.e. worked as both a transmitter and receiver. -- Ian
I got this stuff at an auction for 12 euro.
It's an Z80 based
measuring device and a depth sounder transducer. You can see the
pictures here:
Although the Z80 based device is on-topic, I am particularly
interrested to find out how to use the depth sounder. It has only 2
wires, so I assume it is some sort of element that is both an actuator and a
sensor?
Has anyone any info on this stuff?
The transducer is a lowrance electronics TTH 1192-8.
I don't have any info on that in particular, but I can all but guarantee that
it's
a simple sonar/echo timer system. The same transducer is used for
transmission and reception.
This is pretty similar to the once-common Polaroid ranging systems built into
some "instant" cameras; many of these were repurposed for non-
photographically-related ranging applications, and Polaroid sold eventually
started selling them in development kits for all sorts of stuff.
I pulled one out of a defunct instant camera and turned it into an "electronic
tape measure" many years ago:
http://www.neurotica.com/misc/polaroid_sonar.jpg
The principles behind sonar depth sounders are mostly identical.
-Dave 