If you skip the part where I wasted a lot of time and effort when I
tried to remove the old transducer with a hammer, and go straight to the
holesaw method, it is a 5 minute job and really not that hard. I would
not bother trying to use the very old transducer.
Bill Bina
On 11/25/2015 10:27 PM, Eric Frank via CnC-List wrote:
I am replacing depth, speed and wind instruments on Cat’s Paw with i50
and i60 Raymarine instruments. As noted in an ongoing thread, it is
difficult to remove the old depth transducer, so is it possible to use
the old one with the new Raymarine display? The old transducer is for a
Signet Scientific MK172 instrument, which is probably more than 12 years
old but still works fine. In the manual, it states that “The
transmitter produces six pulses per second at an amplitude of 450 volts
peak·to·peak with 63 watts of power output per pulse. The high power
output is obtained by charging a large capacitor to build a large
current flow without heavy drain from the external power source. The
frequency is adjustable from 160 to 200 kHz but is set at the factory
for 200 kHz nominal.” The transducer that came with the Raymarine
instruments is an Airmar P319, listed on the tag on its cable as 50/200
KHz. That transducer also measures temperature, but I would be happy to
forgo that if I didn’t have to change the transducer. Is there a way of
testing if the old transducer works with the new display while the boat
is on the hard (for the winter)? What happens if you test a transducer
when it is completely out of water? Would it harm the Raymarine
instrument to be connected to the old transducer?
Eric Frank
Cat's Paw
C&C 35 Mk II
Mattapoisett, MA
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