35 metre scart

[petalli]

hello I'm new to blueroom. I need a 35 metre scart cable to connect tv to sky box as the picture quality is poor is this a viable solution and what could be the faults in this ???. could I expect a significant signal loss over this distance if I had a cable made for this pupose

[Simon Lewis]

The WIKI is your friend...

[James]

Petalli.

 

You would like a 35m scart lead to connect your Sky box to your TV.

 

You don't say how you have them connected at the moment but you say that the picture quality is poor.

 

Things that you might want to consider are...

• You may have noise problems on the video line if the sky box and the tv are powered from diferent electrical phases. This will not be a problem in you home but might be a problem in a larger building like a pub or a school.
  
• The scart standard is for unblalanced audio. Depending on where and how far you run your cable you may encounter audion interference.
  
• I doubt you will find a 35m scart cable off the shelf and scart cable is a pig to terminate. If you don't have a fair amount of experience soldering up small multipin connectors I would recomend you find a friendly wireman or contact someone like black box or bryant broadcast to have a 35m cable made up for you.
  

Benifits you might get include

• Assuming yoru projector and set top box both have a spare RGB scart you will get much better pictures over RGB component than either composite or RF modulated signals.
  
• running everything down a single cable is nice and tidy
  

Hope this helps

 

James

[paulears]

35m is a long way for the typical really thin video cores in standard cheap scrat type cable - the audio comments are valid, but at that distance, the Hi-Z will probably make the audio sound somewhat dull too. Separate video - as in composite or proper rgb might well be a better bet - 35m from the digibox seems a bit excessive - could be easier to extend the rf, and use a short scart to the tv. more info, please

[MarkPAman]

I once made and used a scart over 50m. Worked fine. May have just been lucky!

[James]

I once made and used a scart over 50m. Worked fine. May have just been lucky!

 

Where did you buy your cable from, Last time I made a long scart (30m apx) we bought the cable in from canford. I was going to refer the OP to the part codes but it appears to have been discontinued. (likewise without obvious problems but these were in the days before I knew anything)

 

James

[MarkPAman]

I probably go it from maplin, though I can't be sure.

[Locksmith]

What about a signal transmitter (Usually used in the home to send your signal from room to room)? Should have the desired range. Last time I saw one, Dixons had them in for about £25. At that price, probably cheaper than the cable.

 

cheers

 

Dave J

 

Edit: Oops, £49.99 now must have been a special offer when I saw them.

 

Dixons Maplin

[SeanT]

I'd make up (or buy) some adapters from Scart-VGA and back again and use a long VGA cable or two joined together - but then having access to a lot of VGA cable helps.

Otherwise, scart adapter to composite and then proper 75 ohm coax for video and decent long audio cable (or send it unbalanced stereo over star-quad probably using some XLR-RCA breakout cables), or a cat 5 sender for the audio (but stick with the 75 ohm coax for the video if you can)

 

Oh, and the idea of YUV being better than RGBs or RGBHV in the wiki article is fundamentally flawed (the weakness is the scart connection used for RGBs rather than decent 75 ohm video cables for component)

[James]

I'd make up (or buy) some adapters from Scart-VGA and back again and use a long VGA cable or two joined together - but then having access to a lot of VGA cable helps.

Otherwise, scart adapter to composite and then proper 75 ohm coax for video and decent long audio cable (or send it unbalanced stereo over star-quad probably using some XLR-RCA breakout cables), or a cat 5 sender for the audio (but stick with the 75 ohm coax for the video if you can)

 

Um,

 

The video cores on a propper scart lead should be 75 ohm coax anyway.

 

Unbalanced stereo over a single starquad sounds like a realy bad idea, If I'm running unbalanced audio for any length I would realy like an indervidual screen over each channel.

 

Oh, and the idea of YUV being better than RGBs or RGBHV in the wiki article is fundamentally flawed (the weakness is the scart connection used for RGBs rather than decent 75 ohm video cables for component)

 

Just read the article on wikipedia.

 

If you are refering to the list of signals in the practical advice section then I don't know exactly what you are talking about. RGB and YUV are not defined by any connection standard, so implying that they are implying RGB assumes a scart connector is also flawed.

 

I can think of a lot of video equipment that uses three BNCs for component connections, switchable between RGB and YUV.

 

James

[Martin]

As Paulears said, it would be much easier (and cheaper) to extend the RF signal, and you would probably get a better signal due to less loss. Boosters are easily obtainable if necessary. You could either move the sky box nearer the TV or take the RF signal from the sky box and run it the 35m to the TV.

 

At work we have one sky box feeding two TV's. The sky box sits in the AV rack and the RF signal is split (and boosted) 2 ways and run about 50m to each TV down single coax. The added bonus of doing it this way is that you can use IR recievers by each TV, so you can control the sky box locally from each TV. These plug in line with the TV and send the remote signals back down the coax to the sky box. The quality is fine for an average size TV and the Scart connector is used to feed a projector.

[James]

As Paulears said, it would be much easier (and cheaper) to extend the RF signal, and you would probably get a better signal due to less loss. Boosters are easily obtainable if necessary. You could either move the sky box nearer the TV or take the RF signal from the sky box and run it the 35m to the TV.

 

Ugh,

 

Lets take a compressed mpeg feed and compress it to composite introducing pal artifacts all over it, then Amplitude modulate up into the UHF spectrum and back again to go a measly 35m?!?

 

But you are right, it is cheep.

 

Sorry but I read paul's sugestion to be extend the rf feed from the lnb to the the sky box.

 

James

[paulears]

yes- my intention was to extend the lnb feed to the satellite receiver - there are plenty of quite useful in-line rf amps. The specialist satellite dealers use them all the time to do distributed systems.

[SeanT]

I'd make up (or buy) some adapters from Scart-VGA and back again and use a long VGA cable or two joined together - but then having access to a lot of VGA cable helps.

Otherwise, scart adapter to composite and then proper 75 ohm coax for video and decent long audio cable (or send it unbalanced stereo over star-quad probably using some XLR-RCA breakout cables), or a cat 5 sender for the audio (but stick with the 75 ohm coax for the video if you can)

 

Um,

 

The video cores on a propper scart lead should be 75 ohm coax anyway.

 

Unbalanced stereo over a single starquad sounds like a realy bad idea, If I'm running unbalanced audio for any length I would realy like an indervidual screen over each channel.

 

What you say makes sense, but I was just saying what I'd had luck with for temporary solutions - I obviously got a little confused with my post and what I meant by anything that I actually said though!!

The best (only?) decent solution is to extend the LNB feed.

[Tomo]

The best (only?) decent solution is to extend the LNB feed.

For those who are confused, the LNB feed is the coax that runs between the satellite dish and the receiver box.