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Arima Forum => Electronics => Topic started by: Chuck Jones on October 21, 2014, 10:09:50 PM

Title: Making or shortening a coaxial cable
Post by: Chuck Jones on October 21, 2014, 10:09:50 PM
I am trying to find a way to shorten the coaxial cables that go to the Lowrance  HDS  head units.  I find that due to the length of the boat, the standard 20 foot coax cables that come with the unit....are just not quite long enough to reach the head unit where it's located on the dash.  The only solution seems to be buying an extension...but they only come in 15 or 20 foot lengths.

Is there a way to cut and resplice in the end connectors? Or is there someone who sells shorter lengths of the coax? I only need a foot of extra length, and dont' want to have to coil up and stash 15 or 20 feet of extra cable.
Title: Re: Making or shortening a coaxial cable
Post by: Wyrguy on October 21, 2014, 10:43:39 PM
Chuckster... IMO, don't!!! If you can get the right ends (not sure what cable it is you're talking about) but any 'splice' will end up possibly corrupting the data, making your unit useless. If you can find the ends AND a friendly electrical contractor that does high end data wiring you may be ok... The right tools, the knowledge to do it.

$0.02
If we were closer I know just the guys to do it for you!

Rick


Sent from my iPhone using Tapatalk
Title: Re: Making or shortening a coaxial cable
Post by: croaker stroker on October 22, 2014, 12:12:32 AM

Are you talking about the transducer cable?

http://www.in-depthoutdoors.com/community/forums/topic/equipment_670468/
Title: Re: Making or shortening a coaxial cable
Post by: StreamFixer on October 22, 2014, 08:11:23 AM
Chuck

As with so much of today's equipment, you are dealing with Radio Frequencies (phase waves) here.  How they move on the coax cable creates electronic inter-relationships (signal phases), such as occurs in antenna cables on your radio. 

The cables that come with the unit are most often 'designed' to accommodate those relationships and keep everything in sync.  Shortening or lengthening the cable will alter how those phases interact and give you diminished or altered readings (in the case of a radio you will lose transmission power).

I can make the cut and splices for you, I do it regularly with my radio gear, however:

With my HAM radio gear I have a tuner with a HUGE variable capacitor and an adjustable coil, both of which must be adjusted each time I change frequencies to obtain maximum transmission power and 'best' reception.  The newer units (that means more expensive) have elements that will do that automatically if the antenna is 'close' to being correctly trimmed (resonant).  Your equipment does not have those elements.

My advice to you is to buy the correct extensions, coil the coax (which actually helps protect the more delicate electronics from stray signals that could cause harm) and get on with life.

Let us know what you decide to do.

StreamFixer
Title: Re: Making or shortening a coaxial cable
Post by: fishmiester on October 22, 2014, 08:55:19 AM
Also being a Ham Operator, i strongly agree with S.F :yeahthat:
Title: Re: Making or shortening a coaxial cable
Post by: Hydro-Therapy on October 22, 2014, 09:14:07 AM

Chuck you are just going to have to bite the bullet on this one !!!! :hoboy:

H-T
Title: Re: Making or shortening a coaxial cable
Post by: croaker stroker on October 22, 2014, 10:12:38 AM

I already knew Streamfixer was a Ham.
Title: Re: Making or shortening a coaxial cable
Post by: whale on October 22, 2014, 11:52:36 AM
How long of extension do you need? If it's only 2 ft , you could buy something like paddle wheel. It comes with little cable that adds on. At least you get some other option out of it.
Title: Re: Making or shortening a coaxial cable
Post by: fishorcrab on October 22, 2014, 12:52:18 PM
Are you sure the cable is a coax?  The connector looks like it may have as many as 9 pins.  They may be twisted pairs within a shield.

Paul
Title: Re: Making or shortening a coaxial cable
Post by: AlAdams on October 22, 2014, 03:52:42 PM
Chuck - I had the same issue with the length of the Lowrance cable.  Two more feet would have been perfect.  I've got the cable coiled up inside the electrical compartment in the cuddly.  The same thing happened with my old Bottomline.  The good news is when I knicked the cable with my dremel (don't ask...) it turns out it was the extension, not the main cable.  Living a charmed life, sort of... 

For those of you that have read this all the way to the end, if you need an older fish finder that works well, I'll make you a good deal on a Bottomline Sidewinder.  Guess I should put it in the classified section.   :shrug9:
Title: Re: Making or shortening a coaxial cable
Post by: Salmon King on October 22, 2014, 05:32:28 PM
Quote from: AlAdams on October 22, 2014, 03:52:42 PM
Chuck - I had the same issue with the length of the Lowrance cable.  Two more feet would have been perfect.  I've got the cable coiled up inside the electrical compartment in the cuddly.  The same thing happened with my old Bottomline.  The good news is when I knicked the cable with my dremel (don't ask...) it turns out it was the extension, not the main cable.  Living a charmed life, sort of... 

For those of you that have read this all the way to the end, if you need an older fish finder that works well, I'll make you a good deal on a Bottomline Sidewinder.  Guess I should put it in the classified section.   :shrug9:

PM SENT !
Title: Re: Making or shortening a coaxial cable
Post by: LvrWurst 21 SR Skip on October 22, 2014, 10:28:57 PM
Chucker-Doo...back when you had your 19 SR HT, we hauled it up to a guy in Loomis....remember? He was an expert at electronic rigging and worked off his small ranch.....Can't remember his name, but maybe you can find him thru Bill, the Lowrance Pro Staff connection.  J W
Title: Re: Making or shortening a coaxial cable
Post by: StreamFixer on October 23, 2014, 08:10:19 AM
And in the process you have spent more time and $$$ than just buying the extension and being done with it....  And no electronic worries about the cobbled together wire.

Bueno setre Chuck   :hoboy:

StreamFixer
Title: Re: Making or shortening a coaxial cable
Post by: Chuck Jones on October 23, 2014, 10:53:46 PM
Oh yeah JW...I forgot about that fellow....he did work with co-ax....but I think at this point I'll just get the shortest Lowrance extension I can find and coil up the excess.  It's just a bit disconcerting to have to put in a 20 foot extension for a 6 inch shortfall.  (no follow-up comments JW!!!)
Title: Re: Making or shortening a coaxial cable
Post by: LvrWurst 21 SR Skip on October 24, 2014, 10:10:42 AM
CJ.....they make pills for that shortfall!!!!!!!!!!!!!!!!!!
Title: Re: Making or shortening a coaxial cable
Post by: Edog64 on October 24, 2014, 03:54:44 PM

                                             W7CTU
Title: Re: Making or shortening a coaxial cable
Post by: Chuck Jones on October 24, 2014, 07:56:32 PM
HUH???    :yeahthat:   :anyone:
Title: Re: Making or shortening a coaxial cable
Post by: Markshoreline on October 24, 2014, 07:59:16 PM
Chuck,
That's not an acronym like wtf or something...
It's his ham radio call letters, like "Adam12" or "Dragnet" or something....   :jester:
Title: Re: Making or shortening a coaxial cable
Post by: StreamFixer on November 03, 2014, 09:28:34 AM
W7CTU is not a valid HAM license...  Anybody know what he is trying to imply (I hate acronyms)

W7SFR
Title: Re: Making or shortening a coaxial cable
Post by: fishmiester on November 03, 2014, 04:28:11 PM
I noticed that also when I ran it on qrz. maybe a typo? :shrug9:
Title: Re: Making or shortening a coaxial cable
Post by: Chuck Jones on November 03, 2014, 08:44:27 PM
I've seen some acronyms like this that you hold in front of a mirror and read it  upside down or backwards and the numbers/letters spell out some word.
Title: Re: Making or shortening a coaxial cable
Post by: StreamFixer on November 04, 2014, 07:26:20 AM
OK Edog64 --  time to fess up...

StreamFixer
Title: Re: Making or shortening a coaxial cable
Post by: Edog64 on November 04, 2014, 08:27:28 AM
StreamFixer, ya got me!  :nono:  Those were my fathers call letters back in the day. He was an avid Ham but I never got into it just remembered the call letters. When I saw that a couple of the other posters were Hams I just couldnt resist.
Title: Re: Making or shortening a coaxial cable
Post by: strokersquid on November 05, 2014, 07:13:41 PM
If your extension remains straight for more than 4 hours call your Dr.