Does anyone have a video of BBC One going off-air because unfortunately I fell asleep and missed it all!
Afraid my DVD recorder furnished me with a coaster My VHS attempt last year was a failure, the loss of synch during the switching didn't go down too well with my humble recorder.
Does anyone have a video of BBC One going off-air because unfortunately I fell asleep and missed it all!
Afraid my DVD recorder furnished me with a coaster My VHS attempt last year was a failure, the loss of synch during the switching didn't go down too well with my humble recorder.
I programmed the old VCR (I don't have a clue why) to record the BBC One shutdown but it being a worthless piece of cr*p,it didn't work. I luckily managed to tape the BBC Two shutdown. Can't wait to get a DVD Recorder!
Steve I.P, how old is your VCR then? Even my Dad's old Goodmans (which is about 13 years old) handles non-sync ok. You usually just get a little picture wobble when the switch happens for about a second on most recorders now.
I'm capturing the closedowns for both 1 and 2 and an edited version of the test from 1 and will upload to PPs sometime tonight if I can.
what function do the moving green, green and red bits in the circle perform?
I don't know if this is the real reason, but with LCD/plasma displays a lot more commonplace it's quite usefull to have a standard moving image test that you can perform on all of them to see which displays moving images with the least amount of "motion blur"
JNL
Also in TV transmission netwoks it's important to know whether the image you are seeing is 'live' and not 'frozen'. For this reason all modern test cards etc incorporate movement
Descriptions and further info here about the test card seen last night:-
Steve I.P, how old is your VCR then? Even my Dad's old Goodmans (which is about 13 years old) handles non-sync ok. You usually just get a little picture wobble when the switch happens for about a second on most recorders now.
About 3 years old, from Emley going onto RBS to it coming back the picture was a mess. Of course it could have been the relay of Emley that I'm subjected to that threw a wobbly instead I guess, I wasn't up to find out
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Useless fact 325: CAR changed its name to CCA about five years ago (central Control Area). There must be a few 'die hards' left in the area. Having said that, whenever I speak to them it's: "hello CAR, sorry, CCA". They so laugh....
Although don't they now say: 'Hello CAR, er, CCA, er Siemens CCA'?
Last time I phoned the sat desk in CCA the phone was answered as 'Hello Siemens Satelite Services'
Quote:
Useless fact 327: That signal shown in a previous post is generally what CCA squirt down all circuits until they are in use. Tells you where it comes from, aspect ratio, bars and 2T pulse and bar. Along with tone (-18dB on digital machines = PPM4), it allows engineers on the receiving end to line up accurately.
And it's not unique to the BBC,ot is used by broadcasters across the world, notably those within the EBU,. There is also a 525 line version of that test pattern.
Part of the purpose of the moving section is to test for lip-sync - the rotating section flashes in time to a gap in the tone
About 3 years old, from Emley going onto RBS to it coming back the picture was a mess. Of course it could have been the relay of Emley that I'm subjected to that threw a wobbly instead I guess, I wasn't up to find out
ah, yeah it probably was then. if the signal has gets really bad by the time it gets to the tx you get your picture from, it could play havok.
if they just get the signal and send it straight back out, it's possible that it could wobble like when you copy a tape and give the copy to somebody else, then they copy it for another person and so on. it gets to a point where the signal degrades and starts to wobble and skew and flick into monochrome, besides the loss in definition.
Of course the test last night is an absolute worst case scenario. In reality for the whole TX network to be disconnected would take something huge to cause it.
In reality the RBS system is intended for a couple of rebroadcast hops at the most
