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Does signal degrade with long hdmi cable?

post #1 of 3
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Hi Guys,

I got a 720p Toshiba lcd tv from my office, it has a native resolution of 1366x768, I flashed it to the latest firmware.

I have it connected with a 15 foot hdmi/dvi cable. No matter how I calibrate it, the picture looks off to me.

Any 3d games look awful, and not the resolution. It's like the colours don't look right. Could this be because the cord is so long, does the signal degrade?
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Superhans
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post #2 of 3
no, HDMI is a digital signal, it doesn't degrade no matter how long the cable. Analog on the other hand does

Its not like Networking cable that would require shielding.
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post #3 of 3
Quote:
Originally Posted by mothrpe View Post

Hi Guys,
I got a 720p Toshiba lcd tv from my office, it has a native resolution of 1366x768, I flashed it to the latest firmware.
I have it connected with a 15 foot hdmi/dvi cable. No matter how I calibrate it, the picture looks off to me.
Any 3d games look awful, and not the resolution. It's like the colours don't look right. Could this be because the cord is so long, does the signal degrade?


Yes, signal does degrade over too long a length.

 

Quote:

Cables

Although no maximum length for an HDMI cable is specified, signal attenuation (dependent on the cable's construction quality and conducting materials) limits usable lengths in practice.[65] HDMI 1.3 defines two cable categories: Category 1-certified cables, which have been tested at 74.5 MHz (which would include resolutions such as 720p60 and 1080i60), and Category 2-certified cables, which have been tested at 340 MHz (which would include resolutions such as 1080p60 and 2160p30).[62][66][67] Category 1 HDMI cables are marketed as "Standard" and Category 2 HDMI cables as "High Speed".[1] This labeling guideline for HDMI cables went into effect on October 17, 2008.[68][69] Category 1 and 2 cables can either meet the required parameter specifications for interpair skew, far-end crosstalk, attenuation and differential impedance, or they can meet the required nonequalized/equalized eye diagram requirements.[66]A cable of about 5 meters (16 ft) can be manufactured to Category 1 specifications easily and inexpensively by using 28 AWG (0.081 mm²) conductors.[65] With better quality construction and materials, including 24 AWG (0.205 mm²) conductors, an HDMI cable can reach lengths of up to 15 meters (49 ft).[65] Many HDMI cables under 5 meters of length that were made before the HDMI 1.3 specification can work as Category 2 cables, but only Category 2-tested cables are guaranteed to work.[70]

 

source: http://en.wikipedia.org/wiki/HDMI

 

But your 15 feet cable does not seem to be the culprit.  I am using several 5 meter long HDMI cables myself and so I can say that this length is OK.

Also, tuning is more like 'fine tuning' and it cannot correct problem caused by another factor.  Another factor is in play (eg a faulty cable).

 

Have you confirmed that the colour of the TV is correct with another signal source (in order to eliminate the possibility of a bad firmware flash)?

What is the brand and model number of the TV? 

Are you using your sig rig card to drive the TV?

 

 


Edited by windfire - 12/6/11 at 3:52pm
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