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Seeking comments on HDMI Cable lenghts


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3 replies to this topic

#1 of 4 Reginald Trent

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Posted January 01 2006 - 06:27 AM

I've read about longer HDMI cables creating sparkles/distorted images. So I'm wondering if I'll 25' HDMI cable will be less suseptible to those problems than a 35' or longer? This will run primarily from a DVD player to a projector.

#2 of 4 ChristopherDAC

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Posted January 02 2006 - 03:02 AM

Any digital connexion is susceptible to the "cliff effect". That is, as the run gets longer and longer, nothing seems to happen until a point is reached at which the "eye pattern" suddenly becomes unrecoverable, and the signal is degraded beyond usability.

With a high datarate, high density connexion such as an HDMI cable, exactly where this occurs depends considerably on the quality of the cable itself. It is also influenced by external factors, so that the critical point can move back and forth along the length; when the critical length value becomes less than the length of your cable, you will lose signal. More troublingly, because of the same factors, intermittent partial loss of signal seems to be a problem, judging from previous HDMI threads here.

All in all, I would suggest that you use the shortest cable you can get away with. This is usually good advice.


#3 of 4 Phil A

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Posted January 03 2006 - 05:14 AM

I'm not sure how well they work, since they're not out yet, but Gefen will be releasing new products in the coming mos. as per the press releases for the upcoming CES today:

"Gefen Distributes HDTV Eight Ways

Las Vegas, NV - New HDMI Distribution Amplifiers from Gefen provide a simple and effective way to send a single HDTV source to multiple displays at the same time.

Two new models support up to four or eight different HD displays at a time: the 1:4 HDMI Distribution Amplifier comes with one HDMI input and four HDMI outputs; the 1:8 HDMI Distribution Amplifier supplies one HDMI input and eight HDMI outputs. Gefen already supplies a 1:2 HDMI Splitter for $249.

The plug and play distribution amplifiers provide full HDMI compliance and are engineered to deliver video at its highest resolutions, up to 1080p.

"Splitting HD video through HDMI connections isn't as simple as it used to be with analog video," said Hagai Gefen, president and CEO. "We engineered the Gefen HDMI Distribution Amplifiers to perform a seamless split that maintains the full integrity of the HD digital video signal, even up to eight displays."

The Gefen HDMI Distribution Amplifiers are compatible with all audio/video components that support high definition video such as DVD players, satellite television systems and digital video recorders equipped with HDMI. They can also support components equipped with DVI when combined with an optional DVI to HDMI Adapter from Gefen.

Both the 1:4 HDMI Distribution Amplifier (MSRP $399) and the 1:8 HDMI Distribution Amplifier (MSRP $899) work with an external power supply (included) and are available to order online at Gefen.com or through an authorized Gefen reseller.


About Gefen
A leader in the high definition digital domain, Gefen delivers advanced technologies with multi-platform extension, switching, distribution and conversion capabilities. Gefen equipment is utilized all over the world in professional AV/IT and consumer electronics/home theater environments. Their add-on hardware maximizes system functionality and enhances operability by enabling AV systems to go beyond their original functionalities. Solutions support an array of connectivity interfaces including HDMI, DVI, dual link DVI, HD-SDI, SDI, VGA, RCA, USB, Firewire and RS-232. A selection of high quality cabling is also available. Additional information may be found at http://www.gefen.com.

Gefen Booth 21768
South Hall

************************************************** *************************
Gefen Sends Digital HDTV up to 150 Feet with Touch Screen Control Capability

Las Vegas, NV - No need to rewire the home for HDTV. Two new solutions from Gefen use industry-standard category-5 cables to send the high resolutions of HDTV up to 150 feet.

Both units use the standard sender and receiver-based transmission systems powered by a single power supply that can be connected on either end. Sender and receiver are connected by CAT-5 cable in lengths up to 150 feet with no loss of quality or imagery.

"The DVI and HDMI RS-232 Extenders are advantageous for home theater systems because they allow in-wall cabling to be used for HD screens and displays throughout the home," said Hagai Gefen, president and CEO. "RS-232 control enables touch screens to be used for HD content control as well, which is perfect for cutting-edge home automation."

The DVI RS-232 Extender works with all HDTV sources, including satellite television, DVD players, digital video recorders and even computers, plus HD displays and projectors equipped with DVI or HDMI connectors. For analog video fans, there's a version that supports VGA equipment as well.

High resolutions imagery up to 1080p is guaranteed with no loss of quality or noise; HDCP compliance is built into the units for protected content.

Both the DVI RS-232 Extender (MSRP $599) and the VGA RS-232 Extender (MSRP $349) are available to order online at Gefen.com.

About Gefen
A leader in the high definition digital domain, Gefen delivers advanced technologies with multi-platform extension, switching, distribution and conversion capabilities. Gefen equipment is utilized all over the world in professional AV/IT and consumer electronics/home theater environments. Their add-on hardware maximizes system functionality and enhances operability by enabling AV systems to go beyond their original functionalities. Solutions support an array of connectivity interfaces including HDMI, DVI, dual link DVI, HD-SDI, SDI, VGA, RCA, USB, Firewire and RS-232. A selection of high quality cabling is also available. Additional information may be found at http://www.gefen.com.

Gefen Booth 21768
South Hall
************************************************** *********************
Gefen HDTV Extender Goes Wireless

Las Vegas, NV - Using proprietary technology, Gefen is presenting its new Wireless HDMI Extender prototype at CES—a first-of-its-kind wireless transmitter that supports the cable-free extension of high definition video at its highest resolutions.

The sender/receiver system, unlike previous prototypes, uses radio based frequency transmission to send HDCP compliant HD video up to 10 meters (30 feet) from source to HDTV display. No cabling is required to achieve a perfect replication of image and sound on the receiving end.

It is designed to provide a cutting-edge alternative to cable-based extension solutions for home theaters and other small size environments.

"Unlike previous methods we were exploring, this version is not line-of-sight, which avoids many complications with those types of systems," said Hagai Gefen, president and CEO.

This unique innovation is available exclusively through Gefen, who plans to release subsequent versions to accommodate DVI and component video.

During CES, a prototype will be demonstrated in Gefen's booth (21768), located in the South Hall. The company plans to begin shipping in the second quarter of 2006 though this is not confirmed at this time.

About Gefen
A leader in the high definition digital domain, Gefen delivers advanced technologies with multi-platform extension, switching, distribution and conversion capabilities. Gefen equipment is utilized all over the world in professional AV/IT and consumer electronics/home theater environments. Their add-on hardware maximizes system functionality and enhances operability by enabling AV systems to go beyond their original functionalities. Solutions support an array of connectivity interfaces including HDMI, DVI, dual link DVI, HD-SDI, SDI, VGA, RCA, USB, Firewire and RS-232. A selection of high quality cabling is also available. Additional information may be found at http://www.gefen.com.

Gefen Booth 21768
South Hall
"

#4 of 4 etop8222

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Posted March 30 2012 - 03:46 AM

Since I purchased a new LED TV and moved the Plasma TV downstairs, I was thinking of connecting the downstairs plasma (HDMI) from my Tivo via a HDMI splitter which would be feeding the LED upstairs and the Plasma downstairs. My question is. would a 25 ft. HDMI cable provide enough signal to provide a satisfactory picture to the Plasma downstairs.