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'[EE]: 25m of HDMI cable: can I cut and resolder?'
2008\08\22@041447 by Electron

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Hi all,
first of all please forgive my bad English, it is not my native language.
I need to pass 25 meters of HDMI cable through a wall, but the connector is too
large to pass through the "tube", so I have to cut it and resolder it. I wonder
if it will work, given the bandwidths of HDMI, or if signal reflections etc..
at the soldered points will degrade the signal too much. I wanted to ask here
before I ruin a 25m cable and do much useless work.

Thanks a lot,
Mario

2008\08\22@051916 by Carl Denk

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MCM has wall plates that are split and large size pass through holes for
oversize connectors. They also have cables (HDMI, Audio, component
video) in various lengths. The are a division of Newark and into
Professional video and sound, SATV, CATV, security, and some computer
stuff. If you order from them, they send sale flyers with good prices.
http://www.mcmelectronics.com/search.aspx?C=&K=wall%20plate

Could take a plain piece of plastic or metal, drill a hole and a grommet
that has been split on one side for the cable to pass through, 2 screw
holes, and split with a saw to allow the cable to get the hole. Paint to
match.

Also they have Baluns (some desktop or Keystone plate type) for various
TV, computer (VGA,mouse, Keyboard) and sound that allow use of Cat-5
cable in the wall. Friend in the TV distribution (stations, apartments,
commercial etc.) (and they probably weren't MCM's) claims these don't
work well even short length  for HDMI. Does anyone have experience with
CAT-5 for HD tV, either HDMI, or HD component and Cat-5?

Electron wrote:
{Quote hidden}

2008\08\22@074535 by Michael Rigby-Jones

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> -----Original Message-----
> From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu] On
Behalf
> Of Electron
> Sent: 22 August 2008 10:14
> To: microcontroller discussion list - Public.
> Subject: [EE]: 25m of HDMI cable: can I cut and resolder?
>
>
>
> Hi all,
> first of all please forgive my bad English, it is not my native
language.
> I need to pass 25 meters of HDMI cable through a wall, but the
connector
> is too
> large to pass through the "tube", so I have to cut it and resolder it.
I
> wonder
> if it will work, given the bandwidths of HDMI, or if signal
reflections
> etc..
> at the soldered points will degrade the signal too much. I wanted to
ask
> here
> before I ruin a 25m cable and do much useless work.
>

25 meters is already an exceptionally long cable for HDMI, are you using
some kind of signal extender?  Have you actually tested the cable in
operation to ensure it works?  I know some of the cheaper cables cause
problems in lengths as short as 10 meters.

Regards

Mike

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2008\08\22@093327 by M. Adam Davis

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On 8/22/08, Electron <electron2k4spamKILLspaminfinito.it> wrote:
> I need to pass 25 meters of HDMI cable through a wall, but the connector is too
> large to pass through the "tube", so I have to cut it and resolder it. I wonder
> if it will work, given the bandwidths of HDMI, or if signal reflections etc..

I don't know.  I would  be interested in finding out, but it depends
on many factors.  I suspect it isn't going to make a noticable
difference, especially given that it's a digital signal, and you're
already extending it so far.  A signal extender/repeater should clean
up any issues with the length of the cable and solder joint as well,
if you run into problems.

However, eventually the cable is soldered to the connector, so at some
point there is a solder junction, and you may be able to unsolder it,
run the cable, and resolder and existing joint.  Alternately (since
it's likely molded and will look ugly if you cut the molding and
desolder the connector) you might simply buy a replacement connector:

http://www.hdequipment.eu/hdmi-cable-connector.html

-Adam

--
EARTH DAY 2008
Tuesday April 22
Save Money * Save Oil * Save Lives * Save the Planet
http://www.driveslowly.org

2008\08\22@110144 by Dario Greggio

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Michael Rigby-Jones wrote:

> 25 meters is already an exceptionally long cable for HDMI,

this was my 1st thought too...
I'm interested in knowing how it goes...

--
Ciao, Dario

2008\08\22@113619 by Carl Denk

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There are repeaters, and as I mentioned before, baluns that allow much
greater length, but haven't heard of a good report yet, only input as
mentioned, an experienced designer/installer that for the moment is
staying away. Could have been different manufacturer/model or even
defective. Check out the MCM link and search a bit.

Dario Greggio wrote:
> Michael Rigby-Jones wrote:
>
>  
>> 25 meters is already an exceptionally long cable for HDMI,
>>    
>
> this was my 1st thought too...
> I'm interested in knowing how it goes...
>
>  

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