After re-reading the original message, I should correct myself. You can test if
the transducer is working, but not if the echo sounder is – your calibration
might be completely off.
Marek
From: Russ & Melody via CnC-List
Sent: Friday, November 27, 2015 2:41 PM
To: cnc-list@cnc-list.com
Cc: Russ & Melody
Subject: Re: Stus-List substitution of depth transducers
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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