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Q: How long can I run a digital line?
hello.
I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? Thanks J |
Q: How long can I run a digital line?
In article ,
Jay wrote: I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? No problem. Use co-ax rather than optical - it's cheaper. -- *The man who fell into an upholstery machine is fully recovered.* Dave Plowman London SW 12 RIP Acorn |
Q: How long can I run a digital line?
On Fri, 6 Feb 2004 13:06:49 +0000 (UTC)
Jay wrote: I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. ought to work. You'll know when it doesnt. -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Fri, 6 Feb 2004 13:06:49 +0000 (UTC), Jay wrote:
hello. I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. No problem. I've run 30' feet using rg58 with perfect results. Is this way out or is this possible? Thanks J |
Q: How long can I run a digital line?
On Fri, 06 Feb 2004 14:13:23 +0000 (GMT)
Dave Plowman wrote: I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. they were selling 12m ones for ~20 IIRC. -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Fri, 6 Feb 2004 13:06:49 +0000 (UTC), Jay wrote: hello. I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? Thanks J First off, use Coax. Second, any old piece of crap phono leed will do. As for length I'm guessing 6m will not be a problem as the signal is digital. If you can hear a sound with no skips or breaks, then the cable is working perfectly. Ray. |
Q: How long can I run a digital line?
On Fri, 6 Feb 2004 14:53:42 +0000, Ian Molton wrote: On Fri, 06 Feb 2004 14:13:23 +0000 (GMT) Dave Plowman wrote: I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. they were selling 12m ones for ~20 IIRC. MUG ALERT! Oh Dear Ian. My Digital Coax cable cost me nothing, it was one of those 'free' ones you get with every Hi-Fi box. Better still you get 2 of them, ones colored Red and one White. Personally I think the Red one gives a warmer sound. Okay, I'll stop taking the **** now.... IT'S A DIGITAL SIGNAL, ANY OLD PIECE OF ****E WILL DO (for coax)! Which is why on this group, Coax is prefered, because it does the same thing and the cable costs virtually nothing. Ray. |
Q: How long can I run a digital line?
Nutter wrote in
: On Fri, 6 Feb 2004 13:06:49 +0000 (UTC), Jay wrote: hello. I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? Thanks J First off, use Coax. Second, any old piece of crap phono leed will do. As for length I'm guessing 6m will not be a problem as the signal is digital. If you can hear a sound with no skips or breaks, then the cable is working perfectly. Ray. Excellent. Cheers for the help, people. I have another question, though. I'll start a new thread.... j |
Q: How long can I run a digital line?
On Fri, 06 Feb 2004 16:08:42 +0000
Nutter wrote: MUG ALERT! Oh Dear Ian. WTF are you on about? 20ukp for 12 metres of optic fibre with 'plugs' on is not bad at all. Okay, I'll stop taking the **** now.... IT'S A DIGITAL SIGNAL, ANY OLD PIECE OF ****E WILL DO (for coax)! ILLITERACY ALERT! I said *optic fibre* not coax. Which is why on this group, Coax is prefered Is it? Cant say I've noticed a preference either way. At least with the optic fibre I dont even have to CARE about wether noise from my PC will ever reach my DAC (probably wouldnt on coax either but I like that I dont need to care. , because it does the same thing and the cable costs virtually nothing. The Coax can *in theory* transmit more than just the wanted signal (no I dont mean jitter). Wether it does or not is down to your individual equipment. This is simply a non-issue with optic fibre. I didnt buy a 12 m optic fibre anyhow - I bought a 3m one. that 6ukp was including VAT+PnP IIRC too. Thats a good price for ANY interconnect, even a coax one. -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Fri, 06 Feb 2004 15:16:55 +0000
Nutter wrote: First off, use Coax. Or, better, use optic fibre which is just as cheap and eliminates any possibility of transmitting electrical noise between components. Second, any old piece of crap phono leed will do. For short lengths. and it really *ought* to be 75 ohm, too. That said, 6m probably counts as short. As for length I'm guessing 6m will not be a problem as the signal is digital. Digital pulses can be *harder* to transmit due to being square waves. just because its digital doesnt make it easier. What it does mean is that if the signal is at all recoverable at the other end it will work *perfectly* (well, close to perfectly in the case of SP/DIF...). If you can hear a sound with no skips or breaks, then the cable is working perfectly. Not necessarily. a DAC could well conceal small errors in the signal. -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
In article ,
Ian Molton wrote: No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. Right. I'd just make up one of the correct length. Haven't tried with optical. Does it solder easily? they were selling 12m ones for ~20 IIRC. Oxygen free glass? -- *Suicidal twin kills sister by mistake. Dave Plowman London SW 12 RIP Acorn |
Q: How long can I run a digital line?
In article , Nutter
writes On Fri, 6 Feb 2004 14:53:42 +0000, Ian Molton wrote: On Fri, 06 Feb 2004 14:13:23 +0000 (GMT) Dave Plowman wrote: I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. they were selling 12m ones for ~20 IIRC. MUG ALERT! Oh Dear Ian. My Digital Coax cable cost me nothing, it was one of those 'free' ones you get with every Hi-Fi box. Better still you get 2 of them, ones colored Red and one White. Personally I think the Red one gives a warmer sound. Okay, I'll stop taking the **** now.... IT'S A DIGITAL SIGNAL, ANY OLD PIECE OF ****E WILL DO (for coax)! Which is why on this group, Coax is prefered, because it does the same thing and the cable costs virtually nothing. Ray. Yep, we ran SPDIF down a couple of hundred metres of CT100 co-ax the other month and it sounded fine!..... -- Tony Sayer |
Q: How long can I run a digital line?
On Fri, 06 Feb 2004 18:53:45 +0000 (GMT)
Dave Plowman wrote: No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. Right. I'd just make up one of the correct length. Haven't tried with optical. Does it solder easily? the SPDIF ones are plastic. a scalpel would probably suffice. they were selling 12m ones for ~20 IIRC. Oxygen free glass? what, LESS than 50p/metre and you're complaining? -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Fri, 6 Feb 2004 16:55:09 +0000, Ian Molton wrote:
On Fri, 06 Feb 2004 16:08:42 +0000 Nutter wrote: MUG ALERT! Oh Dear Ian. WTF are you on about? 20ukp for 12 metres of optic fibre with 'plugs' on is not bad at all. Okay, I'll stop taking the **** now.... IT'S A DIGITAL SIGNAL, ANY OLD PIECE OF ****E WILL DO (for coax)! ILLITERACY ALERT! I said *optic fibre* not coax. Which is why on this group, Coax is prefered Is it? Cant say I've noticed a preference either way. At least with the optic fibre I dont even have to CARE about wether noise from my PC will ever reach my DAC (probably wouldnt on coax either but I like that I dont need to care. , because it does the same thing and the cable costs virtually nothing. The Coax can *in theory* transmit more than just the wanted signal (no I dont mean jitter). Wether it does or not is down to your individual equipment. This is simply a non-issue with optic fibre. I didnt buy a 12 m optic fibre anyhow - I bought a 3m one. that 6ukp was including VAT+PnP IIRC too. Thats a good price for ANY interconnect, even a coax one. Ian, I think you have failed to understand how your original post was interpreted. You stated: ============= No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. they were selling 12m ones for ~20 IIRC. ============= What I am saying is that, Coax is always cheaper, because you can you a really crap standard piece of phono cable instead of a far more expensive optical one. Your comment interferance from the PC are incorrect. With Digital coax, the signal either reaches the DAC intact or not. You will hear if it does not reach the DAC properly. If the cable carries interferance of any kind (unlikely) it is simply ignored by the DAC due to the error correction built into the digital signal. Ray. |
Q: How long can I run a digital line?
On Fri, 6 Feb 2004 16:59:49 +0000, Ian Molton wrote:
On Fri, 06 Feb 2004 15:16:55 +0000 Nutter wrote: First off, use Coax. Or, better, use optic fibre which is just as cheap and eliminates any possibility of transmitting electrical noise between components. Bull****! Tell be where you can get a 10m Optical cable for £1? Which if you go to Maplins is all it would cost you in parts to make a perfectly suitable coax digital. Second, any old piece of crap phono leed will do. For short lengths. and it really *ought* to be 75 ohm, too. That said, 6m probably counts as short. No - For any length! In fact for long lengths your only option is Coax. As for length I'm guessing 6m will not be a problem as the signal is digital. Digital pulses can be *harder* to transmit due to being square waves. just because its digital doesnt make it easier. What it does mean is that if the signal is at all recoverable at the other end it will work *perfectly* (well, close to perfectly in the case of SP/DIF...). If you can hear a sound with no skips or breaks, then the cable is working perfectly. Not necessarily. a DAC could well conceal small errors in the signal. Only it you've got a crap DAC, or the errors were so small as to make no difference to the audible sound if the errors were not 'concealed'. In any case, I challenge anyone to do a blind test and tell the difference between Coax and Optical. |
Q: How long can I run a digital line?
On Sat, 07 Feb 2004 13:12:01 +0000
Nutter wrote: What I am saying is that, Coax is always cheaper, because you can you a really crap standard piece of phono cable instead of a far more expensive optical one. And I would say to that 'no, not really'. if you buy pre-made leads you will pay at LEAST a fiver for a 3 metre phono and thats not even counting delivery. my 3m optic fibre was 6ukp incl. shipping and VAT. heres an example... http://uk.special.reserve.co.uk/sear...c&sortorder=3a Granted you could probably just jam some bell-wire in a coax port and it would probably work for about 50p. Thats not the point though, is it? Your comment interferance from the PC are incorrect. With Digital coax, the signal either reaches the DAC intact or not. Im not saying it wont. what I am saying is that the digital signal is not ALL that can be brought across the coax - you could bring a sizeable amount of high frequency switching hash (many digital devices use SMPSUs) or LF hum or anything else across. As long as the peaks are below the threshold the system considers 1s, it wont affect the digital signal. If the cable carries interferance of any kind (unlikely) it is simply ignored by the DAC due to the error correction built into the digital signal. Ignored by the digital side of the DAC yes. but its not impossible the noise could affect the analogue parts of the DAC. Granted, any /good/ DAC will eb largely immune to noise of this type, but its not impossible, and an optical link WILL remove it all. -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Sat, 07 Feb 2004 13:17:37 +0000
Nutter wrote: Or, better, use optic fibre which is just as cheap and eliminates any possibility of transmitting electrical noise between components. Bull****! Tell be where you can get a 10m Optical cable for £1? Which if you go to Maplins is all it would cost you in parts to make a perfectly suitable coax digital. You show me the parts list... I just went to maplins and the CHEAPEST phono *connectors* (no cable) are 49 pence each. cheap cable of a suitable type looks to be ~50p/metre so thats 1.50 worth of cable too. so, you're talking 2.50 worth of material and thats BEFORE you add shipping. Do you consider your time soldering worthless? Shipping costs 2.50 btw. so, your 3m coax lead will cost you 5ukp. my 3m optical lead cost me 6ukp. (dont forget it wont propagate noise, btw) wow was I ripped off. **** maannn.... For short lengths. and it really *ought* to be 75 ohm, too. That said, 6m probably counts as short. No - For any length Haha. yeah, ok whatever. If you can hear a sound with no skips or breaks, then the cable is working perfectly. Not necessarily. a DAC could well conceal small errors in the signal. Only it you've got a crap DAC, No, nothing to do with crap. its a design choice - some DACs conceal 'clicks' or 'pops' (whilst not altering 'good' data) because they sound nasty. others choose to play it as is because some people like to hear the errors so they can seek ultimate perfection (or whatever). In any case, I challenge anyone to do a blind test and tell the difference between Coax and Optical. With a GOOD DAC I very much doubt I would be able to tell. Optical may not be 'better', or rather, coax may be no worse - but coax CANT do better than optical. As optical is not more expensive (1ukp isnt a significant difference, and thats comparing a commercial lead to a self-build), WHY NOT use it? -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Fri, 6 Feb 2004 14:53:42 +0000, Ian Molton wrote:
No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. they were selling 12m ones for ~20 IIRC. OK, use it because it's better then. Until amplifiers and players have lightpipes instead of wire inside, there's going to be a conversion from electrical signal to light and a conversion back at the other end. This isn't going to INCREASE quality, is it. |
Q: How long can I run a digital line?
Nutter wrote:
Bull****! Tell be where you can get a 10m Optical cable for £1? Which if you go to Maplins is all it would cost you in parts to make a perfectly suitable coax digital. Why is it that, when someone asks a newbie question about cables, some arsehole thinks that the most suitable solution for them is to buy raw materials and solder one up 'because it's cheaper'? How long would it take for a newbie to source and acquire the parts - and the tools - and make up the cable? How many goes would it take for them to get it right? All that ****ing around to save a fiver? I once watched (and occasionally helped) a mate build a sports car in his garage. Next time somebody asks me about what sort of sports car he should get, I'll tell him to make his own, right? To view it from the other perspective, someone who can solder up their own cables isn't going to come to an audio group and ask a newbie question about cables - they're just going to go and get on with making one. Second, any old piece of crap phono leed will do. For short lengths. and it really *ought* to be 75 ohm, too. That said, 6m probably counts as short. No - For any length! What a load of ****. Do you know what an "ohm" is? -- Wally www.artbywally.com www.wally.myby.co.uk/music |
Q: How long can I run a digital line?
On Fri, 06 Feb 2004 16:08:42 +0000, Nutter wrote:
Okay, I'll stop taking the **** now.... IT'S A DIGITAL SIGNAL, ANY OLD PIECE OF ****E WILL DO (for coax)! Which is why on this group, Coax is prefered, because it does the same thing and the cable costs virtually nothing. Not so. Digital signals, and particularly their timing, can be corrupted by unsuitable cables. But try the cheap cable. It will probably be OK. |
Q: How long can I run a digital line?
On Sat, 07 Feb 2004 13:17:37 +0000, Nutter wrote:
Bull****! Tell be where you can get a 10m Optical cable for £1? Which if you go to Maplins is all it would cost you in parts to make a perfectly suitable coax digital. 10 metres of cable and two phono plugs for £1? Which Maplin is that? |
Q: How long can I run a digital line?
In message , Wally
writes Nutter wrote: Bull****! Tell be where you can get a 10m Optical cable for £1? Which if you go to Maplins is all it would cost you in parts to make a perfectly suitable coax digital. Why is it that, when someone asks a newbie question about cables, some arsehole thinks that the most suitable solution for them is to buy raw materials and solder one up 'because it's cheaper'? How long would it take for a newbie to source and acquire the parts - and the tools - and make up the cable? How many goes would it take for them to get it right? All that ****ing around to save a fiver? I once watched (and occasionally helped) a mate build a sports car in his garage. Next time somebody asks me about what sort of sports car he should get, I'll tell him to make his own, right? To view it from the other perspective, someone who can solder up their own cables isn't going to come to an audio group and ask a newbie question about cables - they're just going to go and get on with making one. Second, any old piece of crap phono leed will do. For short lengths. and it really *ought* to be 75 ohm, too. That said, 6m probably counts as short. No - For any length! What a load of ****. Do you know what an "ohm" is? -- Wally www.artbywally.com www.wally.myby.co.uk/music I'm sure he does, but it seems you don't. The 75 or 50 Ohms is nothing to do with resistance. It's the impedance seen by the wavefront as it travels down the cable, and is a function of the inductance and capacitance of each tiny segment of cable. (Calculus and all that!) As the old saying goes: A little learning etc.. -- Chris Morriss |
Q: How long can I run a digital line?
Chris Morriss wrote:
I'm sure he does, but it seems you don't. The 75 or 50 Ohms is nothing to do with resistance. It's the impedance seen by the wavefront as it travels down the cable, and is a function of the inductance and capacitance of each tiny segment of cable. (Calculus and all that!) What is the unit of impedance? What is the characteristic impedance of "any old piece of crap phono leed". As the old saying goes: A little learning etc.. Try a little reading. -- Wally www.artbywally.com www.wally.myby.co.uk/music |
Q: How long can I run a digital line?
In message , Wally
writes Chris Morriss wrote: I'm sure he does, but it seems you don't. The 75 or 50 Ohms is nothing to do with resistance. It's the impedance seen by the wavefront as it travels down the cable, and is a function of the inductance and capacitance of each tiny segment of cable. (Calculus and all that!) What is the unit of impedance? What is the characteristic impedance of "any old piece of crap phono leed". As the old saying goes: A little learning etc.. Try a little reading. -- Wally www.artbywally.com www.wally.myby.co.uk/music True, I hadn't looked far enough back up the thread. :-( -- Chris Morriss |
Q: How long can I run a digital line?
Chris Morriss wrote:
True, I hadn't looked far enough back up the thread. It was quoted in the post you replied to, as was the idiot's claim that any-old-crap phono lead would do "For any length!". As soon as I read the thick **** saying that, I immediately thought of a 100m drum of the stuff. Then I remembered that BT used to have repeaters in their early PCM systems and found myself wondering why. Then I realised that he was spouting total ****e. :-( :-) -- Wally www.artbywally.com www.wally.myby.co.uk/music |
Q: How long can I run a digital line?
To view it from the other perspective, someone who can solder up their own
cables isn't going to come to an audio group and ask a newbie question about cables - they're just going to go and get on with making one. Hi-fi users, who have been brainwashed into believing in "magic" interconnects, may need reminding that standard components and learning a simple skill is an excellent alternative. Second, any old piece of crap phono leed will do. For short lengths. and it really *ought* to be 75 ohm, too. That said, 6m probably counts as short. No - For any length! What a load of ****. Do you know what an "ohm" is? I suspect you think it's a simple measurement of resistance. Not so, with cables carrying high-frequency signals. |
Q: How long can I run a digital line?
On Sat, 07 Feb 2004 18:13:22 +0000, Laurence Payne
wrote: Second, any old piece of crap phono leed will do. For short lengths. and it really *ought* to be 75 ohm, too. That said, 6m probably counts as short. No - For any length! What a load of ****. Do you know what an "ohm" is? I suspect you think it's a simple measurement of resistance. Not so, with cables carrying high-frequency signals. OK, I've just read back the thread too :-) Practically-speaking, short lengths of damp string often work. Longer lengths need the right cable. Why would YOU say this was? |
Q: How long can I run a digital line?
On Sat, 07 Feb 2004 16:18:55 +0000
Laurence Payne wrote: No problem. Use co-ax rather than optical - it's cheaper. 'scuse me? I picked up a 3m optical cable for 6ukp. they were selling 12m ones for ~20 IIRC. OK, use it because it's better then. Until amplifiers and players have lightpipes instead of wire inside, there's going to be a conversion from electrical signal to light and a conversion back at the other end. This isn't going to INCREASE quality, is it. Not likely to decrease it either, is it? buit the optic fibre isnt going to transmit electrical noise is it? -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Sat, 7 Feb 2004 18:25:44 +0000, Ian Molton wrote:
OK, use it because it's better then. Until amplifiers and players have lightpipes instead of wire inside, there's going to be a conversion from electrical signal to light and a conversion back at the other end. This isn't going to INCREASE quality, is it. Not likely to decrease it either, is it? buit the optic fibre isnt going to transmit electrical noise is it? Sure. It'll transmit whatever you feed it. Hopefully :-) You mean "pick up", not "transmit" of course. Digital signals are relatively immune to noise. What they DO suffer from is clock jitter and waveform corruption of various kinds, I think. |
Q: How long can I run a digital line?
On Sat, 07 Feb 2004 19:36:09 +0000
Laurence Payne wrote: *PLEASE* read through the thread and spare me explaining AGAIN... once more with feeling, short form. Sure. It'll transmit whatever you feed it. Hopefully :-) You mean "pick up", not "transmit" of course. No. I mean transmit. and shielded coax is not going to pick up much at all. what it can do is transmit any noise present in the source to the DAC. Digital signals are relatively immune to noise. No argument there. however the analogue gear in the DAC is most certainly not, and will pick up anything that isnt nailed down and filtered from the input. What they DO suffer from is clock jitter and waveform corruption of various kinds, I think. Not what Im takling about in this instance, but yes. -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
"TCS" wrote in message
On Fri, 6 Feb 2004 13:06:49 +0000 (UTC), Jay wrote: hello. I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. No problem. I've run 30' feet using rg58 with perfect results. Ironically, that's the wrong impedance stuff. RG59 is the *proper* stuff for digital audio. I don't doubt that the 58 worked fine at that length. |
Q: How long can I run a digital line?
"Nutter" wrote in message
On Fri, 6 Feb 2004 13:06:49 +0000 (UTC), Jay wrote: hello. I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? Thanks J First off, use Coax. Second, any old piece of crap phono leed will do. As for length I'm guessing 6m will not be a problem as the signal is digital. If you can hear a sound with no skips or breaks, then the cable is working perfectly. Obviously, someone never had an audio system complex enough to have a ground loop. |
Q: How long can I run a digital line?
Laurence Payne wrote:
Practically-speaking, short lengths of damp string often work. Longer lengths need the right cable. Why would YOU say this was? I don't profess to be an expert, but... Summink to do with reflections and/or attenuation when the characteristic impedance of the transmission line doesn't match the impedances of the devices being connected. I would imagine that long lengths of "any old piece of crap phono leed" might be poor for digital transmission since they are often used in LF analogue applications where the input impedance is several K ohms - the inductance and capacitance of the cable can afford to be higher. The characteristic impedance of damp string is highly dependent on things like the salinity of the water used to dampen the string, as well as environmental factors, such as the rates of evaporation and replenishment. I'd imagine that it would also require a fairly elaborate arrangment if screening is required to minimise interference. -- Wally www.artbywally.com www.wally.myby.co.uk/music |
Q: How long can I run a digital line?
On Sat, 7 Feb 2004 22:34:13 -0500, "Arny Krueger"
wrote: "Nutter" wrote in message On Fri, 6 Feb 2004 13:06:49 +0000 (UTC), Jay wrote: hello. I'd like to run a digital out from my DVD player to a DAC. How long can this cable be? I can use a coaxial or an optical. I was hoping it could run six metres. Is this way out or is this possible? Thanks J First off, use Coax. Second, any old piece of crap phono leed will do. As for length I'm guessing 6m will not be a problem as the signal is digital. If you can hear a sound with no skips or breaks, then the cable is working perfectly. Obviously, someone never had an audio system complex enough to have a ground loop. No, its just that I wrap all my cables with cooking foil, with ferris (?) rings every 5cm. Each separate is encassed in steel, and has its own feed direct to my main electrical box with a power purifer and surge protector. ;8 ) |
Q: How long can I run a digital line?
On Sat, 7 Feb 2004 16:57:36 -0000, "Wally"
wrote: Chris Morriss wrote: True, I hadn't looked far enough back up the thread. It was quoted in the post you replied to, as was the idiot's claim that any-old-crap phono lead would do "For any length!". As soon as I read the thick **** saying that, I immediately thought of a 100m drum of the stuff. Then I remembered that BT used to have repeaters in their early PCM systems and found myself wondering why. Then I realised that he was spouting total ****e. Please please stop twisting multiple threads of mine to suit your own needs. First, any old crap phono lead will do for a digital signal, if you bothered to read my post incontext you will note I was refering to the free ones that come with all 'hi-fi' seperates. Second, as for length, let use our brains here. When I said any length I meant, any length that you might reasonable need for a home cinema setup. We are talking 10's of meters here, not 100's. Next time I'll be more precise. Third (for Ian this one), it is cheaper to make your own leeds, suitable cheap cable will set you back 20p p/meter, with plastic phono plus cost 20p each.By my calcs thats £1.40 for 5m. Summary (So as not to lose the point of this whole thread): The point being the original poster asked what he should use and the answer is Coax NOT Optical because the Coax route (if you follow my advice about using free phono leeds that come with all hi-fi seperates) IS cheaper than any Optical cable on the market. I challenge you to rebute this statement with 'he's sputing total ****e'. Ray. |
Q: How long can I run a digital line?
Nutter wrote:
Please please stop twisting multiple threads of mine to suit your own needs. What are you talking about? First, any old crap phono lead will do for a digital signal, if you bothered to read my post incontext you will note I was refering to the free ones that come with all 'hi-fi' seperates. Second, as for length, let use our brains here. When I said any length I meant, any length that you might reasonable need for a home cinema setup. We are talking 10's of meters here, not 100's. Next time I'll be more precise. "Any" means "any", it doesn't mean a form of "any" qualified by some unstated criteria. If you can manage something more precise than "any crap of any length will work", that would be most welcome. If you can't manage anything more precise, then expect to be called an idiot. Third (for Ian this one), it is cheaper to make your own leeds, suitable cheap cable will set you back 20p p/meter, with plastic phono plus cost 20p each.By my calcs thats £1.40 for 5m. Who gives a **** about that? There are people on this planet who aren't interested in soldering up cables, or who lack the skills, the dexterity, the tools, the time to acquire the bits and/or learn. There are people who earn far more per hour than the money they'd save in the time it would take to make a cable. Just because you happen to think making up a cable is the way to do it, it doesn't follow that that's the right way for someone else to do it. Summary (So as not to lose the point of this whole thread): The point being the original poster asked what he should use and the answer is Coax NOT Optical because the Coax route (if you follow my advice about using free phono leeds that come with all hi-fi seperates) IS cheaper than any Optical cable on the market. I challenge you to rebute this statement with 'he's sputing total ****e'. Read the original post, dickhead. He asked how long the cable can be, not what the cheapest method was. -- Wally www.artbywally.com www.wally.myby.co.uk/music |
Q: How long can I run a digital line?
On Sun, 08 Feb 2004 16:01:12 +0000
Nutter wrote: Third (for Ian this one), it is cheaper to make your own leeds, suitable cheap cable will set you back 20p p/meter, with plastic phono plus cost 20p each.By my calcs thats £1.40 for 5m. Prove it - you stated you could make a 3m lead for a quid from Maplins. you're backtracking. (and I know how much leads cost to make - I've made my own before now. commercial ones cost about the same and theres no hassle.) -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
On Sun, 08 Feb 2004 16:01:12 +0000
Nutter wrote: The point being the original poster asked what he should use and the answer is Coax NOT Optical because the Coax route (if you follow my advice about using free phono leeds that come with all hi-fi seperates) IS cheaper than any Optical cable on the market. Thats NOT *the* answer, its *AN* answer. Another is to use optical because it eliminates another possibility for introducing noise into the amplification chain. Your argument about coax being free because everyone has it is invalid not only because NOT everyone has it, but also because some equipment comes with free optical leads in the 1/2 meter sort of range. -- Spyros lair: http://www.mnementh.co.uk/ |||| Maintainer: arm26 linux Do not meddle in the affairs of Dragons, for you are tasty and good with ketchup. |
Q: How long can I run a digital line?
Ian Molton wrote:
The point being the original poster asked what he should use and the answer is Coax NOT Optical because the Coax route (if you follow my advice about using free phono leeds that come with all hi-fi seperates) IS cheaper than any Optical cable on the market. Thats NOT *the* answer, its *AN* answer. Exactly. He answered a question that wasn't asked and is now whining like a bairn as he tries to puke his dumb error back up after it was shoved down his throat. ;-) -- Wally www.artbywally.com www.wally.myby.co.uk/music |
Q: How long can I run a digital line?
In article , Laurence Payne
wrote: What a load of ****. Do you know what an "ohm" is? I suspect you think it's a simple measurement of resistance. Not so, with cables carrying high-frequency signals. Erm, we may need to make a distinction here to avoid confusion. The Ohm is the unit of resistance. Nominally comes from the definitions of the Volt and the Ampere. You can then generalise by allowing the value to be complex instead of real and specify values that way. A cable that genuinely has a characteristic impedance of 'X Ohms' will - if either 'very long' or attached to a load of the same resistance - act just like a resistive load to the source. Thus if you had ten light years of 75 Ohm cable and fired signals into it, so far as the signal source would be concerned it would (for 20 years, anyway!) look indistinguishable from a 75 Ohm resistor. Ditto for a shorter lead terminated in the matching resistance. However most cables that are called 'X Ohms' tend not to actually have this value of impedance (resistance) at all frequencies, and hence may have an impedance which is not always resistive, and varies with frequency. For domestic digital links this matters very little, though. :-) Slainte, Jim -- Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html |
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