Analogue Cable Questions

[Sgt.Annihilator]

With analogue cable now running a reduced service (lack of channels). I would like to know a bit of its history like when this channel disappeared from boxes. Also as you see there, every time Channel 71 shows up in that clip, its blank. Can anyone remember what this channel was meant to be in the original channel lineup?

And also... When, why and on what channel did this appear on analogue cable?

[spiderplant]

The analogue channel lineups were/are different in each region, so you'll have to find someone who knows about the history in your region. Does Videotron/01703 mean you are in Southampton?

[Sgt.Annihilator]

Yeah the cable company in Southampton was Videotron and 01703 was the area code (changed to 02380 a few years back)

Anyway i got something else to ask now...

We had analogue cable until 2000 when we got Sky Digital but a couple of years ago when we last redecorated we removed the analogue "white box" off the wall. What does the main catv cable coming to our house for analogue cable do without this white box?

[Andrewcrawford23]

Originally Posted by Sgt.Annihilator

Yeah the cable company in Southampton was Videotron and 01703 was the area code (changed to 02380 a few years back)

Anyway i got something else to ask now...

We had analogue cable until 2000 when we got Sky Digital but a couple of years ago when we last redecorated we removed the analogue "white box" off the wall. What does the main catv cable coming to our house for analogue cable do without this white box?

i believe it carrys a small voltage under 40v i beleive which isnt dangerous, well i tella lie all voltage and curretns are dangerous evena battery of 1.5v but udner 100v is considered by eletrical board safe.

it probalyl doesnt do much mroe than that but you igth have cause faults in your area for other people and virign could sue you if it was found you removing that had caused faults they had to repair

[beeman]

Originally Posted by Andrewcrawford23

i believe it carrys a small voltage under 40v i beleive which isnt dangerous, well i tella lie all voltage and curretns are dangerous evena battery of 1.5v but udner 100v is considered by eletrical board safe.

it probalyl doesnt do much mroe than that but you igth have cause faults in your area for other people and virign could sue you if it was found you removing that had caused faults they had to repair

technically voltage isnt dangouraus at all, you can run several thousand volts through your body without ANY ill affects (exept making your hair stand on end). In fact back in my school days thats exactly what they done in science class. Its ampage thats dangerous. a charge with 1v and 100 amp will kill you but 100000v and 0.0001amp will do nothing

[Andrewcrawford23]

Originally Posted by beeman

technically voltage isnt dangouraus at all, you can run several thousand volts through your body without ANY ill affects (exept making your hair stand on end). In fact back in my school days thats exactly what they done in science class. Its ampage thats dangerous. a charge with 1v and 100 amp will kill you but 100000v and 0.0001amp will do nothing

very true but you cant garantee what the ampage will be without knowing the restinance if you can garatnee the restinance you know you what he ampage will be but for that reason all voltage are dangerous i you have a resitanc of 0.0000000001 ohms even a voltage of 1.5v will kill

[Kymmy]

Originally Posted by Andrewcrawford23

very true but you cant garantee what the ampage will be without knowing the restinance if you can garatnee the restinance you know you what he ampage will be but for that reason all voltage are dangerous i you have a resitanc of 0.0000000001 ohms even a voltage of 1.5v will kill

It's not voltage that kill, it's amperage, The 1.5v arguement above though is useless as your skin resistance would never be that low and you'd need many mega-amps. The rule in general is that anything over 50v is capable of getting past your normal skin resistance.. If the skin resistance did equal the quote then the amperage woud be 15000000000amps (15 giga-amps which would vapourize most conductive items (think of an arc welder with an open circuit voltage of only 30volts, at 50 amps it can happily weld 1mm steel plates together))

As for high voltages it's very dependant on the type of voltage and where it's applied.. A 50kv stun gun to your leg will make the leg spasm with no harmful effect but one to your spine will drop you like a stone as it'll interfere with a major nerve paths..

[Andrewcrawford23]

Originally Posted by Kymmy

It's not voltage that kill, it's amperage, The 1.5v arguement above though is useless as your skin resistance would never be that low and you'd need many mega-amps. The rule in general is that anything over 50v is capable of getting past your normal skin resistance.. If the skin resistance did equal the quote then the amperage woud be 15000000000amps (15 giga-amps which would vapourize most conductive items (think of an arc welder with an open circuit voltage of only 30volts, at 50 amps it can happily weld 1mm steel plates together))

As for high voltages it's very dependant on the type of voltage and where it's applied.. A 50kv stun gun to your leg will make the leg spasm with no harmful effect but one to your spine will drop you like a stone as it'll interfere with a major nerve paths..

This is very big misconsepom, 1.5v battery can produce over 500amps throuht eh human body, under the right condiitons, those condition include water, unwell, broken skin bla bla bla, no one should assume that it is safe, it jsut consider safe because the likelhood of a small voltage ever produce current killing ampage is very small but it can happen, the same apply you can easily attach yourself to 1MV cable and not get killed as it usual carries a small ampage for the reason of heat you dnt want overhead cables melting most peopel assume the voltage means the hgiher it is the more chane you will be killed

and you dnt need many mega amps to kill, acutally a 50kv stun gun will kill if it faulty because 50kv drops to 5kv after inital contact then drops toa lower voltage after it applying for mroe than 1second i dnt knwo the 3rd voltage

[Kymmy]

You're taking a lot of guesses with them figures... Where did you get the 500amps for a 1.5v battery... It'd melt at that current..

The point which most people miss is that a high voltage will disrupt your nervous system (by overload) but unless it stop your heart or frazzles a few brain cells it simply will not kill.. Where as current is different in that it causes burns within the tissue it passes through..

As for a stun gun?? where the hell did you get that rubbish from? A stun gun uses a flyback pulse (about 400-600volts) initiated by a small spark gap whihc then feeds a small EHT transformer (about 100 turns to 5000) and shouldn't have any voltage drop at all in use. Designed a few of them and tested a few circuits..(in relation to ignition circuits, and also EHT generators)

Now if you want to go any further with tis comical argument then lets please take it to PM as this is dragging this thread wildly off topic..

Sorry guys now hopefuly back on-topic.

As for channels When we first had cable in Harlington (near heathrow) the channels were totally different to another analogue region the other side of London which we moved to two years later..

[musicbravo]

As i remembered it voltage = potential difference. Key word being potential. It is the electrical push around a circuit. The push can't kill you as such it can only interfere with your bodies own electrical system, hence why defibulators push huge voltages in order to restart your heart. however in this case the amperage is a matter of milliamps. In a cell however potential can drop quickly dependent on where the potential is being applied. e.g potential of 1.5v in a cheap battery in a camera can drop v quickly.

I'm done now never had analogue cable so cant offer anything else.