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drice1234
Joined: 07 Oct 2006
Posts: 1309
Location: Allen, Texas
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| Posted: Thu Feb 07, 2008 1:01 pm Post subject: Anyone have experience with this HDMI over CAT5 device? |
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I had ran some extra CAT5 to the projector when I installed it. The cabling from my source devices to the PJ is about 40 feet. Now that I am getting ready to go with an HDMI setup I am looking for a way to send the signal without having to utilize one of the HDMI fiber transmission devices. I will have a 1209 with the Eisemann modded on board HDMI card. It would be nice if this would work.
Thanks
Dan
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=320207445382&ssPageName=STRK:MEWA:IT&ih=011
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Thu Feb 07, 2008 4:59 pm Post subject: |
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Wow, that's dirt cheap... cheap as in 20-30% of other similar products. It would be awesome if it worked. I guess for $100, there's not much risk in giving it a whirl. You can always sell it on ebay for $99 if you don't like it. It comes in a gift box, too! 
SC
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Joust
Joined: 05 May 2006
Posts: 2429
Location: Almonte, Ontario, Canada
TV/Projector: Marquee 8501LC
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| Posted: Thu Feb 07, 2008 8:30 pm Post subject: |
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who's gonna try them out for us?
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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drice1234
Joined: 07 Oct 2006
Posts: 1309
Location: Allen, Texas
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| Posted: Thu Feb 07, 2008 10:35 pm Post subject: |
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| Quote: | | Only difference is one twisted pair cable run isn't enough to support 1080p. Hopefully you pulled 2 CAT5's, or you'll be using one to backpull nylon string and then pull back 2. |
According to the instructions they use (1) CAT5 for the video and (1) for the audio. Since I would only need the video then one should be enough. I am sure you already know but there are (4) pairs of wire in a CAT5 cable. When I am ready I will probably go ahead and try this. It beats the $400 for the HDMI fiber convertor option.
Dan
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Joust
Joined: 05 May 2006
Posts: 2429
Location: Almonte, Ontario, Canada
TV/Projector: Marquee 8501LC
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| Posted: Thu Feb 07, 2008 11:55 pm Post subject: |
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I don't believe the HDMI ones are simple baluns. they are active devices.
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oliverg
Joined: 15 May 2007
Posts: 800
Location: Melbourne, Australia
TV/Projector: Sony G90 X2 - Vidikron Vision 1
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| Posted: Fri Feb 08, 2008 12:28 am Post subject: |
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Cat5 can handle 100mb, Cat5e and Cat6 1Gb - that's more than enough bandwidth to handle 1080p .. Cat6 can handle up to 250Mhz of bandwidth.
It all depends on how the device translates and transports the data - is there any information on its internal specifications?
I remember I had this RF transmitter that beamed a stereo pair and composite video from between two stations. I found out that it had enough bandwidth to transport an SP/DIF bitstream over the video component. Every time someone walked in between the two dishes, the sound would cut out 
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Fri Feb 08, 2008 12:35 am Post subject: |
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Wow, I didn't know there were any that were that cheap. I might have to get a pair to try transporting my HDMI sources upstairs.
Speaking of using devices for applications which they weren't intended... If might stray OT for a second, would there be any reason you couldn't use something like an Extron RGBS (or even composite based on your experience, Oliver) matrix switcher to switch coaxial SPDIF? That would be a super-cheap way for me to move audio around my house... if only everything were coaxial. I'd have to convert all my TOSlink devices to coax, but it might be worth it.
SC
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oliverg
Joined: 15 May 2007
Posts: 800
Location: Melbourne, Australia
TV/Projector: Sony G90 X2 - Vidikron Vision 1
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| Posted: Fri Feb 08, 2008 12:44 am Post subject: |
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Give it a try SC, I ended up mounting my transmitter's directional antennas near my ceiling so people wouldn't keep knocking my signal out every time they walked through it.
(sorry for the OT point)
Gefen make some HDMI over UTP don't they? Probably for a lot more. I'd love to know what method/transport/translation these devices used, that would give us a better idea of whether the signal was truly/faithfully being moved or whether there were some compromises along the way. What happens with HDCP - passed? Or stripped? Usually, these devices are totally transparent and the signal is the same at each end.
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Fri Feb 08, 2008 2:22 am Post subject: |
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| oliverg wrote: | Cat5 can handle 100mb, Cat5e and Cat6 1Gb - that's more than enough bandwidth to handle 1080p .. Cat6 can handle up to 250Mhz of bandwidth.
It all depends on how the device translates and transports the data - is there any information on its internal specifications?
I remember I had this RF transmitter that beamed a stereo pair and composite video from between two stations. I found out that it had enough bandwidth to transport an SP/DIF bitstream over the video component. Every time someone walked in between the two dishes, the sound would cut out |
I started with that design...from X10, and you're right...they were (are) horribly prone to drop out from anything. Not just people moving in the path of the stream. I have a set in a box (brand new) that I used for about a week before ditching them. I figured they were good enough to beam stereo audio and composite video to the bathroom LCD. It was horrible.
The transmitter of course had to be near the AV rack and the emissions eminating from it destroyed the signal right at the source. I could have run longer cables and moved it away...but where could I put it in an HT that would look good? So...I went with the baluns.
If the HDMI balun you're looking at is active then it gets its power from one of two sources (Sorry...I didn't look at yours good enough to say one way or the other). It either takes it from the source and two wires are used for power over the run, or there's a wall wart involved somewhere.
And yup...I know how many wires are in a twisted pair. God knows I've pulled a couple thousand miles of it. (I STILL have to have a cheat sheet when crimping the connectors on)  I've worked on so many networks where guys make it up as they go along, eg, it doesn't matter if blue and white is in location 4 or 5, etc. as long as it's the same on both ends. That works...but I'm too anal to accept that.
It's extremely cool to play with these things tho. It's fast and relatively easy and the results are, in my install, more than satisfactory for the application.
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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oliverg
Joined: 15 May 2007
Posts: 800
Location: Melbourne, Australia
TV/Projector: Sony G90 X2 - Vidikron Vision 1
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| Posted: Fri Feb 08, 2008 2:26 am Post subject: |
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JustGreg, what was REALLY funny is that one day, a big fly flew between the two stations and (pure coincidence) the sound dropped out
My sister saw it and looked at me wide eyed.. I tried to explain the fly wasn't big enough but she still doesn't believe me
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Joust
Joined: 05 May 2006
Posts: 2429
Location: Almonte, Ontario, Canada
TV/Projector: Marquee 8501LC
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| Posted: Fri Feb 08, 2008 2:28 am Post subject: |
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the HDMI one has a wall wart. It must have digital repeaters inside.
using these , if they work, may be cheaper than buying good quality long runs of HDMI cables.
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drice1234
Joined: 07 Oct 2006
Posts: 1309
Location: Allen, Texas
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| Posted: Fri Feb 08, 2008 2:53 am Post subject: |
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I just noticed the feedback for the seller. Over 10,000 transactions and 100% feedback. Also offers a 30 day return policy. It will be another couple of weeks before I put all of the modded boards back into the 1209 but I am going to buy one of these and try it out with my hd dvd player and a digital pj that we have in the office.
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