1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

'Transformers'

Discussion in 'Electrics UK' started by JohnW2, 1 Jul 2021.

  1. Harry Bloomfield

    Harry Bloomfield

    Joined:
    30 Dec 2018
    Messages:
    7,594
    Thanks Received:
    1,086
    Country:
    United Kingdom
    Yes, it was mounted in a separate box which sat on the left of the 19 set, with a big red light on it and a massive multi-way plug linking the two. I remember someone mounting one in the engine compartment, used to power his electric razor whilst camping.

    I've converted 19 sets and R1155's from Lancasters in an earlier life.
     
  2. Sponsored Links
  3. ericmark

    ericmark

    Joined:
    27 Jan 2008
    Messages:
    18,295
    Thanks Received:
    1,708
    Location:
    Llanfair Caereinion, Nr Welshpool
    Country:
    United Kingdom
    OK fair enough not well put, but to get the 12 volt supply to around 200 volt there were two methods, one was a single unit, the other multi-unit, with same result.

    If we compare the latter with today the 12 volt is still turned into AC but at a high frequancy which allows smaller transformer to be used, and less smoothing required when converting back to DC.

    The same transforming down, still use a wire wound transformer but using a high frequancy it can be much smaller.

    The diffrence is today the it is combined not seprate units.
     
  4. JohnW2

    JohnW2

    Joined:
    28 Jan 2011
    Messages:
    48,206
    Thanks Received:
    3,152
    Location:
    Buckinghamshire
    Country:
    United Kingdom
    I agree.

    Kind Regards, John
     
  5. Harry Bloomfield

    Harry Bloomfield

    Joined:
    30 Dec 2018
    Messages:
    7,594
    Thanks Received:
    1,086
    Country:
    United Kingdom
    They would always remove the platinum (?) wire from the rotary ATU of those sets.
     
  6. SUNRAY

    SUNRAY

    Joined:
    28 Jul 2009
    Messages:
    5,288
    Thanks Received:
    393
    Location:
    Kent
    Country:
    United Kingdom
    IIRC they called them something like 'variometer' mine came with a broken shaft, I was able to drill some more holes in the outer sleeve and move all the inner gubbins forwards so the remains of the fibre shaft was enough to refix the knob. I remember the wire looking like tarnished silver so always assumed it was silver plated copper. But I now have no idea one way or the other.
     
  7. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    73,609
    Thanks Received:
    4,247
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    platinum does not tarnish

    it is quite difficult to work.

    I don't know when Platinum Points started to become popular, but they used to be kept in a safe.
     
  8. Harry Bloomfield

    Harry Bloomfield

    Joined:
    30 Dec 2018
    Messages:
    7,594
    Thanks Received:
    1,086
    Country:
    United Kingdom
    It was basically a coil, wound onto a tubular fibre former. The former had a track/groove cut into its surface, from memory the former was around 2" dia x 6" long. A metal roller had a similar groove cut around its perimeter, mounted on a rod. As you operated the crank handle, the idea was that the metal roller would make it's way along the winding, varying the tapping point on the coil, to tune the antenna. What ever wire it was, had been removed for its scrap value, from all of the ATU's I came across, so my assumption was it was platinum as they were tropicalised sets.
     
  9. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    73,609
    Thanks Received:
    4,247
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    Until recently, the price of platinum was higher than gold, partly due to the difficulty in smelting and working it.
     
  10. Sponsored Links
  11. SUNRAY

    SUNRAY

    Joined:
    28 Jul 2009
    Messages:
    5,288
    Thanks Received:
    393
    Location:
    Kent
    Country:
    United Kingdom
    Ah you're describing a roller coaster inductor, I'll say my limited experience of such things, Ā½dozen at most, some were tarnished and some were gleaming bling, as such I'll very happily offer that both types of wire have been used.

    The WS19 used a different device which was a cylindrical enclosure
    upload_2021-7-5_13-54-38.png
    Sadly my memory from 1975 of making that repair doesn't give me total recall, however it basically consisted of a coil mounted on the spindle something like this:
    upload_2021-7-5_13-58-41.png
    And a big face capacitor. I'll assume there is a second, static, coil but any sort of detail eludes me. I want to say there are spring wires connecting the the coil (just like a meter movement) but again I'll not offer that as fact.

    These were designed to be mounted directly under the aerial mount in tanks and an adapter bracket including a connexion to an aerial socket was made for use in Landrovers which fitted into keyhole slots on a modified WS19 case.
     
  12. JohnW2

    JohnW2

    Joined:
    28 Jan 2011
    Messages:
    48,206
    Thanks Received:
    3,152
    Location:
    Buckinghamshire
    Country:
    United Kingdom
    In the distant past I've had, and used, ATUs containing those sort of things (and probably still have a few!), and I was always under the impression that the wire was silver-plated. That's certainly what it looked like and it did tarnish to some extent over time.

    Kind Regards, John
     
  13. Harry Bloomfield

    Harry Bloomfield

    Joined:
    30 Dec 2018
    Messages:
    7,594
    Thanks Received:
    1,086
    Country:
    United Kingdom
    Near 60 years ago, so my memory is vague. The one I had, was in a square box, part of something else in the same box, perhaps a PSU - but seems unlikely to be the PSU so close to the antenna.
     
  14. SUNRAY

    SUNRAY

    Joined:
    28 Jul 2009
    Messages:
    5,288
    Thanks Received:
    393
    Location:
    Kent
    Country:
    United Kingdom
    And specifically for the WS19?
    I've never been aware of any different arrangement for the set, but I'm not any authority on their history and that may very well be something new to me.
     
  15. Harry Bloomfield

    Harry Bloomfield

    Joined:
    30 Dec 2018
    Messages:
    7,594
    Thanks Received:
    1,086
    Country:
    United Kingdom
    It came with it when I bought it..

    Nor I.
     
  16. Harry Bloomfield

    Harry Bloomfield

    Joined:
    30 Dec 2018
    Messages:
    7,594
    Thanks Received:
    1,086
    Country:
    United Kingdom
    Yes, that was the name.
     
  17. davelx

    davelx

    Joined:
    26 Sep 2006
    Messages:
    1,920
    Thanks Received:
    171
    Location:
    London
    Country:
    United Kingdom
    That might have been a version of the add-on linear amp to boost the RF transmitter power to about 25W- Made WS No.19 into a WS No.19 HP.
     
    Last edited: 5 Jul 2021
    • Thanks Thanks x 1
Loading...

Share This Page