Old Transducer with a new Depth Display? - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 21 Old 10-20-2010 Thread Starter
Senior Member
 
Join Date: Aug 2007
Posts: 219
Thanks: 0
Thanked 9 Times in 6 Posts
Rep Power: 9
 
Old Transducer with a new Depth Display?

I removed a very old mechanical-dial style depth display from my boat that I was told did work "some of the time". I have not (yet) removed the bronze thru-hull transducer with the 2 wire leads and am wondering if this older transducer may work with only a new digital display (assuming the problems with my old unit were more likely the mechanical-dial display, not the transducer).

I see transducers come (generally) as 50kHz and 200kHz or dual frequency. Any ideas on the whether I can avoid replacing the old transducer and just get a new digital display unit? Or where there is a good web resource on this? I've spent the better part of 2 hours trying to research an answer without luck, though it does seem some depthfinders are sold as separate display and transducer units.

Thanks for any help you can provide.
hriehl1 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 21 Old 10-20-2010
1968 Pearson Wanderer 30
 
ilikerust's Avatar
 
Join Date: Apr 2010
Location: Richmond, VA
Posts: 212
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
I have the same situation, except my old depth sounder works just fine.

But I bought a brand new Garmin GPS chartplotter that has a depth display, which requires a new transducer. I am seriously doubting that the old transducer will work, as we're talking about probably a 30-year technology gap.

I'll be interested to know what you find out, but I doubt the old one will work with the new digital tech.

- Bill T.
- Richmond, VA

"Twenty years from now you will be more disappointed by the things you didn't do, than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
- Mark Twain
ilikerust is offline  
Quote Quick Reply Share with Facebook
post #3 of 21 Old 10-20-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
It depends. Many of the transducers are/were made by a single company—Airmar. Many of their transducers were made to work with multiple displays. I've used the transducer that came with my Raymarine instruments with a TackTick display head that replaced them.

How old is the transducer and what frequency does it use. If you can find a display head that uses the same frequency and has the same number of wires, there is a possibility that it would work with the old transducer. However, do you know the transducer works? If not, then don't bother and just replace it.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #4 of 21 Old 10-20-2010
1968 Pearson Wanderer 30
 
ilikerust's Avatar
 
Join Date: Apr 2010
Location: Richmond, VA
Posts: 212
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
I'm wondering if the old transducer would have been made to work with a different amount of voltage or current flow than is used by the new, modern digital display?

It's been my experience that older technology tends to require more power to run than modern tech. Modern computer chip technology requires much less power than stuff made in the 1970s and `80s. My concern would be that the modern digital display would not be able to "drive" the old transducer properly or - worse - that connecting it to the old transducer would potentiall damage the new (and very expensive) unit.

I'm wildly theorizing here of course, and would love to be set straight. If I can simply hook up my brand new Garmin to my old depth transducer and eliminate the old depth sounder gauge, without having to buy a new (expensive) Garmin transducer, pull the old one and run a new wire, I'd love it.

- Bill T.
- Richmond, VA

"Twenty years from now you will be more disappointed by the things you didn't do, than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
- Mark Twain
ilikerust is offline  
Quote Quick Reply Share with Facebook
post #5 of 21 Old 10-20-2010
Sundance 23
 
carl762's Avatar
 
Join Date: Jan 2010
Location: Portland Oregon
Posts: 878
Thanks: 2
Thanked 5 Times in 5 Posts
Rep Power: 6
 
The transducers are not that expensive. Get a new one. You'll want all the functionality your Garmin offers, I assume? If you get a transom mounted transducer, you'll get water temp readings.

Water is Life
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
carl762 is offline  
Quote Quick Reply Share with Facebook
post #6 of 21 Old 10-20-2010
1968 Pearson Wanderer 30
 
ilikerust's Avatar
 
Join Date: Apr 2010
Location: Richmond, VA
Posts: 212
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Quote:
Originally Posted by carl762 View Post
You'll want all the functionality your Garmin offers, I assume?
Yeah, that's what I was thinking.

Just another three-digit expense on the boat, and another project to install the damn thing.

Since my old depth sounder works fine, I'm not in a big hurry to do this particular project - particularly since there are so many others that are much higher priority (like rebedding just about everything on the deck to stop the leaks when it rains...).

- Bill T.
- Richmond, VA

"Twenty years from now you will be more disappointed by the things you didn't do, than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
- Mark Twain
ilikerust is offline  
Quote Quick Reply Share with Facebook
post #7 of 21 Old 10-20-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
Quote:
Originally Posted by carl762 View Post
The transducers are not that expensive. Get a new one. You'll want all the functionality your Garmin offers, I assume? If you get a transom mounted transducer, you'll get water temp readings.
The thru-hull ones also give water temps in most cases.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #8 of 21 Old 10-20-2010
Senior Member
 
Join Date: Jul 2008
Location: 34.25n 119.27w
Posts: 488
Thanks: 1
Thanked 5 Times in 4 Posts
Rep Power: 8
 
If your old transducer sends a 4-20mA signal then it may work. Just a matter of matching the connector to the terminal at the back of the display.
SJ34 is offline  
Quote Quick Reply Share with Facebook
post #9 of 21 Old 10-20-2010
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,890
Thanks: 20
Thanked 223 Times in 170 Posts
Rep Power: 16
       
If it's a 200Khz transducer it will likely work with Raymarine and some others that are 200Khz. Done this many times.

The center conductor of the coax cable is hot and the shield becomes ground. To confuse everyone the new Airmar transducers are often three wires, hot, ground and shield. When using an old coax transducer just make the center conductor hot and the shield the ground. On the ST-60 you can just ignore the shield input and use ground and hot and it will work fine if it is a 200Khz unit.

There were very few older 50Khz transducers unless for fish finders. Most of the old ones for depth only were 200 or 210 Khz. If it is a 210 it won't work well with a newer digital read out. I am using a 31 year old Radarsonics, 200Khz transducer with a 2010 Rayamarine ST-60.. I also have the Raymarine unit mounted as a shoot through for back up.

Cut the RCA or termination off the end and strip the jacket from the coax:


Use a mechanics pick to un-braid the coax shield wires:


Twist the shield nicely and turn it into it's own wire:


Wrap aluminum foil around the center conductor then place heat shrink over the wires and shrink. Then install crimp terminals to fit your display:


Plug the red/center conductor into the hot or "BLUE" if using an ST-60 and the shield or black into the ground or BLACK slot if using an ST-60.

BTW my 31 year old transducer was one of the few items to survive my lightning strike this summer even though every ST-60 device on-board was fried. The damn thing is still going....

______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




© Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 10-20-2010 at 10:42 PM.
Maine Sail is offline  
Quote Quick Reply Share with Facebook
post #10 of 21 Old 10-21-2010
1968 Pearson Wanderer 30
 
ilikerust's Avatar
 
Join Date: Apr 2010
Location: Richmond, VA
Posts: 212
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Gawd, I love this place.

- Bill T.
- Richmond, VA

"Twenty years from now you will be more disappointed by the things you didn't do, than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
- Mark Twain
ilikerust is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Depth Finder Display vs Transducer; Have to be bought together? bryanphaas Electronics 1 08-16-2010 02:58 PM
Depth transducer deandavis1 Gear & Maintenance 2 06-12-2010 07:52 AM
New depth sounder - Old transducer??? anderbra Gear & Maintenance 3 06-17-2009 09:02 PM
Looking for a Navico Depth display Spirit_of_America Gear & Maintenance 5 02-02-2008 06:06 PM
Depth Transducer Question gwp Gear & Maintenance 0 07-13-2003 05:38 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome