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Doesn't belong here but................

willow

willow

Regular Contributor
I dropped this over in the ELECTRICAL section of this .com and did not get an answer.... although about 25 folks looked at it.

Seems there are not the experts over 'there'................. that there are here:D.

Anyhow....I have found a solution and will try it. It seems I can buy another depth gauge, for example a Hummingbird, and modify the wiring and use the embedded transducer in my boat.


This can be done as long as the transducer is pairing with a gauge which is capable of receiving the same freq which in this case is 200KHz. My old gauge was a 200KHz receiver so.....away we go.:eek:


Will report back if it works and if you are at all interested here is the link where I found the fix .. http://www.pbase.com/mainecruising/new_depth_old_transducer_ducer


THIS IS MY ORIGINAL POST OVER IN ELECTRONICS

My boat is equipped with a SEA HAWK DIGITAL DEPTH SOUNDER.
The transducer is embedded in the hull just aft of the bow (vessel is 42 feet long)

The problem I have is that the LCD dial is starting to crap out and I can't find anything on the Net about this brand of gauge, probably because it is an original piece and UNIMETRICS is no longer around. Not sure, but someone said UNICOM bought it out.

Let's say I can not get a replacement SH25 gauge................can I get another gauge and just hook up the present transducer or do I have to take the hammer and remove everything and install a complete system????

Attached is a photo of what is happening on the LCD gauge.

Seeking guidance.:rolleyes:
Don Keye

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Hi Don - long time no hear!

Sorry I didn't see your post but I don't get much time to poke around as i used to looking for new posts outside the inboard-I/O areas...Yes, the key is matching the frequency and many transducers are viable.

I'm certain you have a new new gauge either on the way or already on order. If not, you may want to disassemble the existing gauge and see if you can get a part number off the LCD display...they are relatively cheap nowadays and the older ones are pretty easy to replace...if you are handy with a soldering iron...
 
Hi Mark..

Thanks for the info. The boat is winterized and on blocks but I still have access to the "fun-centre" so will pull the old gauge out and see if there is anything on it that I can reference. Just bought four 255Watt solar panels that will be installed in the early Spring. National Parks up here are banning on-board and small, (Honda 2000 type), generators on most islands in the very near future so most everybody is going solar....so much fun !! Take care and I will post what I find on the gauge.
Have a nice week.
 
Hello Mark,

Went down to the boat and pulled the old depth gauge out. Has the three wires going to the hull mounted transducer as well as the normal + and - wires. I pulled the gauge apart and counted 28 soldered connections on the LCD screen !!!!! There were no numbers or names/lettering on the LCD screen .

Just bought a Hummingbird depth gauge and will used my cable to their gauge after I cut and resolder the in-console wires to their cable end. Hopefully it all works.
 
Don, when you say Hull Mounted Transducer, are you speaking of a "Thru-Hull" transducer installation, or a "shoot-thru" installation?
If shoot-thru, you may have a breached bond between the ducer and the fiberglass hull.

.
 
Hi Rick..

Mine is a "thru hull", one can see the transducer once the boat is on blocks..or if I am scuba diving under the boat :D
 
Surface mount technology...and the OEM nomenclature is likely to be on the back...typically, you will have to cut each "leg" and then unsolder its "foot" unless you know somebody with a reflow soldering station...

You can rework the cable as they did in the article...the key is to minimize the "unshielded" transducer leads to the extent practical...it keeps the noise out which is easier than having to process it out.
 
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