tv detector vans

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  • Nigel GoodwinNigel Goodwin Posts: 58,274
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    flagpole wrote: »
    I think the cost effectiveness changed with the penetration of tv's.

    I don't think it was EVER cost effective, which is why there were only a very small number of them, plus many more dummy vans.

    TV penetration in the UK was pretty high a VERY long time ago, certainly well within many years of detector van activity.
  • tim59tim59 Posts: 47,188
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    I don't think it was EVER cost effective, which is why there were only a very small number of them, plus many more dummy vans.

    TV penetration in the UK was pretty high a VERY long time ago, certainly well within many years of detector van activity.

    Yes I agree tv penetration was high just that most people could only afford to rent a tv not buy one, you only have to look back and think how many rental companys there was
  • Chris FrostChris Frost Posts: 11,012
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    What does it matter if it was bought or rented? A TV in the house is still a TV in the house.
  • jjnejjne Posts: 6,580
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    Back in the mid 70's I was taken inside one, and shown how it all worked - basically a lot of expensive professional radio and electronics gear, and two VERY highly skilled and qualified engineers to use it.

    Except that they weren't 'engineers' at all -- they were technicians.

    The engineer would be the person who designed the kit in the first place.
  • Nigel GoodwinNigel Goodwin Posts: 58,274
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    jjne wrote: »
    Except that they weren't 'engineers' at all -- they were technicians.

    The engineer would be the person who designed the kit in the first place.

    You seem to have a very limited idea of what an 'engineer' is? - so out of two people with identical electronics degrees and qualifications you would only consider one of them an 'engineer' because only he is doing design work?.
    Definition of engineer
    noun
    
        1a person who designs, builds, or maintains engines, machines, or structures.
        a person qualified in a branch of engineering, especially as a professional:an aeronautical engineer
    
        2a person who controls an engine, especially on an aircraft or ship.
        North American a train driver. 
    
        3a skilful contriver or originator of something:the prime engineer of the approach
    
  • Tom2023Tom2023 Posts: 2,059
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    The 'radiation' isn't from the CRT, it's from the LOPT stage and scan coils, which is quite considerable.

    The scan coils are part of the CRT.
  • Nigel GoodwinNigel Goodwin Posts: 58,274
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    Tom2023 wrote: »
    The scan coils are part of the CRT.

    No the scan coils are clamped around it - and back in the days of TV detector vans were a completely separate item.

    It was only with the introduction of 'modern' PIL colour tubes that scan coils were bonded to the tube at all (as well as clamped) - but Sony Trinitron tubes were never bonded, and Trinitron tubes still came without scan coils.
  • in_focusin_focus Posts: 307
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    Tom2023 wrote: »
    The scan coils are part of the CRT.

    Good grief. :eek:
  • Tom2023Tom2023 Posts: 2,059
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    If the scan coils aren't part of the CRT presumably there's no need for them to be wrapped around the neck of the CRT, they could even be in a separate box :rolleyes:
  • Tom2023Tom2023 Posts: 2,059
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    Next you'll be telling us the tyre on your car isn't part of the wheel.
  • OrbitalzoneOrbitalzone Posts: 12,627
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    Kinda splitting hairs here and you won't get one over on Nigel, it's never happened on DS

    :D
  • JoddleJoddle Posts: 505
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    I have removed more TV CRTs than most people have had hot dinners.

    The CRT is a component of the TV - a big valve.
    The scancoil pack is another component of the TV.
    The scan coils are placed around the neck of the CRT.

    The CRT won't produce an image on a tv unless it is combined with a set of scan coils.

    The scan coils are not "part" of the CRT itself but are part of the CRT assembly which also includes the EHT generator and rectifier.

    Its a bit like the crank and chain on a bicycle - they are mounted together but they are separate things but you can't say the crank is part of the chain or the chain is part of the crank. Each is a component.


    Re "Next you'll be telling us the tyre on your car isn't part of the wheel. " Well of course this is correct but not a valid comparison as a "wheel" can be assembly of parts. What would be a better comparison is that the rim is not part of the tyre and the type is not part of the rim - both are part of the wheel!
  • Tom2023Tom2023 Posts: 2,059
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    Joddle wrote: »

    The scan coils are not "part" of the CRT itself but are part of the CRT assembly which also includes the EHT generator and rectifier.

    The Scan coils are an integral part of the CRT assembly.

    The EHT generator and the rectifier don't have to be part of the CRT assembly. They could be positioned any where in the TV set or even outside of it.
  • JoddleJoddle Posts: 505
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    Tom2023 wrote: »
    The Scan coils are an integral part of the CRT assembly. .

    Agreed - but not part of the CRT which is a glass bottle
    Tom2023 wrote: »
    The EHT generator and the rectifier don't have to be part of the CRT assembly. They could be positioned any where in the TV set or even outside of it.

    Also agreed - I was simply using that as an illustration of an "assembly" being a set of components - the TV iteself is an assembly of components. Defining the actual perameters of a particlar set of components is not a precision science but a CRT is a CRT - and a CRT assembly implies the CRT plus other things as well which are grouped together.

    Unless somone actually defines "CRT assembly" we don't know for sure exactly which compenents to include.
  • Tom2023Tom2023 Posts: 2,059
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    Joddle wrote: »
    Agreed - but not part of the CRT which is a glass bottle

    The CRT is a very special type electronic valve. Unlike a simple pentode or triode It can not have it's beam control on the inside so it has them on the outside.

    The scan coils are part of the CRT.
  • JoddleJoddle Posts: 505
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    Tom2023 wrote: »
    The CRT is a very special type electronic valve. Unlike a simple pentode or triode It can not have it's beam control on the inside so it has them on the outside.

    The scan coils are part of the CRT.

    This argument is so stupid - A CRT is a CRT and a scan coil is a device which fits onto it to contol the beam because it has no internal control.

    You can't define a CRT and its coils by a component part number, only an assemply part, but you can define a CRT by its indiviual part number and several CRT assemblies will use the same CRT part number but different coil packs depending on the make model etc of the TV.

    Definition - Cathode-ray tube Noun
    (Physics / General Physics) a valve in which a beam of high-energy electrons is focused onto a fluorescent screen to give a visible spot of light. The device, with appropriate deflection equipment, is used in television receivers, visual display units, oscilloscopes, etc. Abbreviation CRT

    Note phrase "with appropriate deflection equipment" - ie
    the coils are extra to the definition.

    I am not getting into this any more - its plain daft.:mad:
  • OrbitalzoneOrbitalzone Posts: 12,627
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    Joddle wrote: »
    I have removed more TV CRTs than most people have had hot dinners.


    Wow you must be a record holder, I reckon I've had approximately 15,000 hot dinners up until last night's dinner
  • OrbitalzoneOrbitalzone Posts: 12,627
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    This whole CRT arguement is pointless you might as well just all pull your trousers down and see who's biggest.... it's completely off tangent to the original post, just like my wang comparison option.
  • JoddleJoddle Posts: 505
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    Wow you must be a record holder, I reckon I've had approximately 15,000 hot dinners up until last night's dinner

    Like it !!!!
  • OrbitalzoneOrbitalzone Posts: 12,627
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    Joddle wrote: »
    Like it !!!!


    :D

    .....
  • in_focusin_focus Posts: 307
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    Tom2023 wrote: »
    The CRT is a very special type electronic valve. Unlike a simple pentode or triode It can not have it's beam control on the inside so it has them on the outside.

    The scan coils are part of the CRT.

    What about electrostatic deflection such as oscilloscope CRT's?

    And in the very early days some electrostatic CRT's were used for television.
  • Tom2023Tom2023 Posts: 2,059
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    I was wondering when someone was going to throw electrostatic CRTs into the argument ;)


    Once we've finished with CRTs shall we move on to the misuse of apostrophes in pluralising capitalized acronyms such as CRT? :D
  • in_focusin_focus Posts: 307
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    Touche :D
  • OrbitalzoneOrbitalzone Posts: 12,627
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    Oh Lord it's turned into a pedant special edition thread
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