Hi Eric,
I didn't see all of your questions answered in
the batch of replies. Don't worry, it's not
unusual for this beloved group o' squirrel chasers :)
- there is no practical way for you to test the
old transducer out of the water
- nothing happens if you try, no damage but it
needs water as a medium to conduct the sound waves
- no harm in using the old Xducer to the new
instrument, but as pointed out deep depth
resolution is lost by not be able to access 50 kHz
I would put low expectation on the temperature
part of the Raymarine transducer. Mine only
lasted 2 years before it failed. I believe that is not uncommon.
Cheers, Russ
Sweet 35 mk-1
B.C. South Coast
At 07:27 PM 25/11/2015, you wrote:
I am replacing depth, speed and wind instruments
on Cats 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 didnt 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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