A question concerning HD TV

Clare_Guy

At the risk of asking a dumb question, is it possible to transmit HD TV from the HD source (skybox) to a HD TV wirelessly?

The reason I'm asking is, I've a pub with several TVs which are, at the moment, connected with co-axial cables. I want to upgrade them all to HD TVs but want to do it without running new cables, if possible?

Thanks.

cormacl

You're best option I think is to re-cable for HDMI runs to each HDTV with a HDMI 1-N splitter at the sending end. The single sky HD box would feed into the HDMI splitter and have the signal sent to each TV separately.

For example, I saw this on Amazon..
http://www.amazon.co.uk/Neet%C2%AE-SPLITTER-Distribution-Amplifier-SHIPPING/dp/B002EACW82/ref=sr_1_13/278-8529124-6897658?ie=UTF8&s=electronics&qid=1254598748&sr=8-13

I have no idea if HDCP annoyances kick in here and stop it from working for premium content etc. There are also considerations of the length of runs, cable quality etc.

So I think your best bet is to look at dedicated AV forums and get some advice from those who may have done this type of thing already.

But you are definitely right to try to get a HD solution here, rather than horse an analog picture to each TV throough the existing coax. It will be worth it for the picture clarity alone, especially for sports coverage.

Sponge Bob

There are 3 categories of HDMI cable and the higher quality ones are about €7 in Aldi or Lidl and about €70 in Currys . Shop around .

The higher quality ones work at longer lengths but it can get problematic with flouresent lights and stuff and they do not take being bent very well.

Your HDMI switch or 1 in and 4 out unit must support HDMI 1.3 Category 2 as well .

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

You may also get HDMI Category 2 cable extenders that work over a pair of Network cables ( these network cables are category 5 UTP or category 6 UTP ideally which are network not hdmi standards ) . This means most of a long run is over network cable not HDMI cable and is only HDMI at both ends.

A box of 100 M of Cat5 or Ca66 UTP costs about €50

Here is one such gizmo

http://www.trianglecables.com/hdmi-c5e-repeater.html

Another with schematic

http://www.networktechinc.com/cat5-hdmi.html

John mac

these are a bit cheaper

still have to buy splitter and run in cables (2, cat 5 network cables to each tv )

54kroc

You can send hdmi wirelessly but it costs quite a bit to do, Try here to see an example. I think you would be better off getting a spark to drop in some hdmi cables for you.

Sponge Bob

Wireless is pointless, not enough spectrum in the wifi bands and too much interference possibilities from phones etc.

54kroc

Sponge Bob wrote: »

Wireless is pointless, not enough spectrum in the wifi bands and too much interference possibilities from phones etc.

What if you got a unit that transmits at 5.8 Ghz, would that not eliminate interference?

Sponge Bob

5.8ghz is better than 2.4 as ther eis less interference. The frequency is used a lot in Urban areas, particularly in the large cities . If you are near a busy mast with lots of gear I would think some is 5.8ghz .

Do not use this spectrum for a video sender either outdoors or across between buildings please.

redout

Why bother with comreg ? How in the name of god would they ever find out ? I have a 5.8Ghz wireless AV sender for over a year now.

54kroc

Sponge Bob wrote: »

You must register the with Comreg if you choose to use that particular band . It would eliminate interference , yes .

Just say it is a base station , registration is free.

http://www.comreg.ie/licensing_and_services/5_8_ghz_registration_-_section_1__operator_details.683.862.58ghzapp1.html

That could be problematic in Ennis as Irish Broadband may be using that band already

http://newmaps.irishbroadband.ie/drawMap.php?minx=129731&miny=173415&maxx=136304&maxy=181451&imgWidth=1157&imgHeight=1114&areaCovered=Ennis&coverageType=Breeze

I recommend registration and seeing if Comreg accepts it before you buy anything .

That's all a bit much Sponge Bob, There are load of people with 5.8Ghz transmitters.

Sponge Bob

cork45 wrote: »

That's all a bit much Sponge Bob, There are load of people with 5.8Ghz transmitters.

Ok , I withdraw that and edited the post.

There is less interference on 5.8ghz ( for now) and it is difficult to penetrate walls and buildings ...meaning they tend to shield the signal inside .

Try to transmit from a point where walls will block it radiating in unnecessary directions thereby causing spectrum pollution. 2.4ghz video senders are dreadful spectrum pollutants in urban areas .

MOST common 5.8ghz senders will not transmit HDMI , eg this one in Maplins . Do check if you recommend a sender as the OP wants to extend HDMI for future proofing .

http://www.maplin.co.uk/Module.aspx?ModuleNo=222672&source=1

Q- Will the sender/receiver work with hdmi output to distribute high definition transmission to a number of HD TV's from an HD Sky or free-sat box? - Brian Jones
Answer- No, this does not support High Definition.

Mike 1972

Sponge Bob wrote: »

too much interference possibilities from phones etc.

Cordless phones sold in Europe shouldnt cause problems at 2.4 GHz (Some North American ones do use these frequencies) however that still leaves Wireless LANS, Bluetooth, Microwave oven leakage, Other videosenders........

54kroc

Sponge Bob wrote: »

MOST common 5.8ghz senders will not transmit HDMI , eg this one in Maplins . Do check if you recommend a sender as the OP wants to extend HDMI for future proofing .

They are fairly hard to find but Gefen have a unit that will do it but the cost is ridiculous,as said above if it's at all possible I think you would be better off cabling the place as imo it would always be better than having a wireless system.
Op why don't you want to cable anyway?

Sponge Bob

He wants to use the existing cable if feasible but it is possibly RG6 or RG59 ( if he is lucky) but more likely that brown rubbish that is incapable of carrying HDMI 1.3 .

Gefen claimed to abe able to do it but discontinued for wireless instead.

http://www.gefen.com/kvm/dproduct.jsp?prod_id=5303

steveon

There are wireless HDMI video senders available from philips but they are new on the market and sell for €600 a pop i beleive...wouldnt be worth it...best option is to put box in a central location and use a hdmi switching box running a hdmi lead to each tv...if that cant be done then split it with ct100 and a good distribution amp...the picture will be fairly good and with a good surround unit Im sure the punters would be happy enought...