Reply
 
Thread Tools Search this Thread
 
Old 22 March 2008, 06:11   #1
Member
 
Country: UK - England
Town: Bristol
Boat name: UBUC
Make: Zodiac
Length: 4m +
Engine: Outboard petrol 40hp
MMSI: 235061135
Join Date: Mar 2008
Posts: 2
OK to shorten sounder transducer cable?

I've just bought a new Garmin Fishfinder 90 to replace a dead echo sounder. To install it requires threading the cable through a narrow metre long channel which the connector at the end of the cable won't fit through.

I want to cut the cable, shorten it and then splice it back together. I've heard that shortening the cable is bad as the unit is calibrated to a particular cable length and that cutting the cable is bad as sonar signal will reflect off the splice and kill the echo sounder. Is this true, or will I get away with it?

Many thanks,
Christopher
__________________

__________________
ChrisO is offline   Reply With Quote
Old 22 March 2008, 08:40   #2
Member
 
Nasher's Avatar
 
Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,147
All the advise I've heard is not to do it.

I worked at Raymarine for a while and asked the question.
The 'tuned to cable length' didn't come in to it, more the standard of join that would be made, and the possibility of adding some resistance.

Nasher
__________________

__________________
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club
Nasher is offline   Reply With Quote
Old 22 March 2008, 19:40   #3
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
I remember all the fuss about satellite cables needing to be of very high quality and to have proper joints etc. I had a dish that I used to prop up in the garden with the wire coming through the letterbox - all I did was twist the wires together and it worked fine!!!
__________________
codprawn is offline   Reply With Quote
Old 22 March 2008, 20:05   #4
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
.
Quote:
Originally Posted by codprawn View Post
...- all I did was twist the wires together and it worked fine!!!
...donít confuse being lucky with being right. ©Jono
__________________
JW.
jwalker is offline   Reply With Quote
Old 22 March 2008, 20:13   #5
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Nah used to do it all the time - because of the winds we get I wouldn't mount the dish on the house. Just propped it in the garden when we wanted to use it. Once the picture went off - turned out a slug had crawled onto the LNB - a bit of salt and the picture was fine!!!
__________________
codprawn is offline   Reply With Quote
Old 22 March 2008, 21:16   #6
Member
 
Country: Other
Town: San Carlos, Mexico
Boat name: INDE
Make: LOMAC 730
Length: 7m +
Engine: 200 Merc.
MMSI: Please press 1
Join Date: May 2006
Posts: 1,688
Send a message via Skype™ to Limey Linda
I need to do the same thing so that I can move the transducer from the transom to the bilge sump.That job is a little bit down on the list but I plan to splice the cable using dielectric grease filled wire nuts. I will then place the whole spliced assembly in a piece of tubing and seal the ends with silicoln.
__________________
Running around like a head with it's chicken cut off.
Limey Linda is offline   Reply With Quote
Old 23 March 2008, 00:24   #7
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Nothing beats greased nuts.....................
__________________
codprawn is offline   Reply With Quote
Old 23 March 2008, 11:38   #8
Member
 
Pete7's Avatar
 
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,850
Chris, had to shorten Garmin cables twice now, one yesterday, both worked afterwards. The through hull type have two wires blue and black plus non insulated earth, the transom mounted type I think 5 for the speed sensor.

The cable has a foil insulation, replace if you can but it's not critical. Just go for it.

Pete
__________________
.
Ribnet is best viewed on a computer of some sort
Pete7 is offline   Reply With Quote
Old 23 March 2008, 16:00   #9
Member
 
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
MMSI: TBC
Join Date: Dec 2006
Posts: 4,013
I spliced in a new transducer when my old one snapped off and I did not want to drag a new cable through the trunk.

I soldered each wire and used heatshrink on each join the covered the lot with a piece Adhesive heatshrink.

I'm confident it will stand the tests of time.
__________________
---------------------------------------------------
Chris Stevens

Born fiddler
Chris is offline   Reply With Quote
Old 26 March 2008, 11:37   #10
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Quote:
Originally Posted by Limey Linda View Post
I need to do the same thing so that I can move the transducer from the transom to the bilge sump.That job is a little bit down on the list but I plan to splice the cable using dielectric grease filled wire nuts. I will then place the whole spliced assembly in a piece of tubing and seal the ends with silicoln.
Use Ancor adhesive lines shrink butt connectors. Two crimps and a heat gun and you're done. If you want to be really anal, add another layer of adhesive lined shrink tubing over that.

jky
__________________

__________________
jyasaki is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 02:16.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.