Go Back   Cruiser Log World Cruising & Sailing Forums > Cruising Forums > General Cruising Forum
Cruiser Wiki Click Here to Login

Join Cruiser Log Today

Thread Tools Search this Thread Display Modes
Old 05-22-2012, 02:41 PM   #1
Rear Admiral
Join Date: May 2008
Posts: 333
Default Sounds like Borneo

Back from Borneo after a flying visit to take possession of our new ketch. Installed new fridges which are now wired and plumbed with just the water cooling to be connected and the final circuit breaker to be installed. Discovered that shopping for parts there is a back alley affair with a wide mix of weird and wonderful characters and a frenzy of pointing, gestures and nods that could mean anything at all

On the test sail I noticed the depth sounder (integrated into the Garmin chart plotter) dropping out or going haywire when ever the engine was turned on. My first thought was that this might be due to interference with the transducer lead run too close to other wiring but I was told that this was a fairly recent occurrence. Lifted the hatch where they were located (paddle wheel & transducer) I noticed another transducer laying next to them with a lead running off under the floor. It looked like this transducer had been replaced but was still connected as when I pulled down the main nav station cover, I found it wired to a silva depth sounder display unit which was then in turn wired to the Garmin.

Would having two transducers close together (one in use and the other simply laying in the hold) but both still getting power, cause a signal variation?

Not being an electronics wiz and still coming to terms with the feast of components and wiring jammed behind the nav main board it's all a little beyond me and in such a remote location, I'm thinking about simply pulling out all transducers, disconnecting them and installing a new one (still in its box in one of the holds) and running that up to the cockpit totally separate to everything as a single stand alone display. I can then sort out integration when we get back to Oz with someone who knows what they are doing rather than me bumbling about. Does this make sense?

Fair winds,


mico is offline   Reply With Quote
Old 05-22-2012, 08:05 PM   #2
redbopeep's Avatar
Join Date: Jun 2007
Home Port: Washington DC
Vessel Name: SV Mahdee
Posts: 3,236

David passes along that you may be getting noise from the alternator when the engine is on. Could be any number of things along the way (to the depth sounder) but corrosion in connectors, terminals, etc. Go through and check for corrosion and clean up everything.

You can get out your computer with a serial port--your NMEA 0183 signal will be able to be dumped to the computer (it's text) and you'll be able to tell if it's giving you something like um...depths. If all scrambled, then noise in the signal is likely.

Since it only happens when engine is on, the above is likely. If all the time:

If you have two depth transducers, you need to make sure they are running on different frequencies. Our FLS is different frequency than our DST. Can't recall the two different frequency bands, but you could look up each of your transducers and see if they both are running on the same frequency.

No, they don't tell you this stuff when you're buying the transducers either

Good luck!

PS--we like stand alone display rather than part of chart plotter. Our depth transducer runs to a CruzPro display inside that can be seen from cockpit. The FLS is in the cockpit and can be seen from there, of course. We note that the DSP is approx 30 feet behind the FLS. So, we often get two very different depths from the two different sensors.
"Do or do not. There is no try." - Yoda

What we're doing - The sailing life aboard and the Schooner Chandlery.

redbopeep is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Borneo Update mico General Cruising Forum 2 05-11-2012 05:04 PM
Borneo to OZ - share some experiences? mico General Cruising Forum 2 03-15-2012 11:19 AM
Borneo Cruising JeanneP Regional Discussion Topics 0 12-28-2009 09:30 PM
Kudat Borneo To Darwin Via Ambon Rossmonty Regional Discussion Topics 2 08-18-2008 07:21 AM
If It Sounds Too Good To Be True, It Probably Is!! rod hodgson General Cruising Forum 9 05-08-2006 05:01 PM

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

All times are GMT. The time now is 11:43 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.0