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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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5th Apr 2017, 10:41 am | #1 |
Octode
Join Date: Oct 2008
Location: Littlehampton, West Sussex, UK.
Posts: 1,465
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Please identify Woden mod trans
In my pic starting from the bottom is a UM1 and then a UM2 both marked as such.
The top trans - is it a UM3 or 4. It's definitely a Woden and it's 5-1\4" square but has no identifying marking. I have the data sheet which gives connections and impedances but no physical sizes. Any ideas please. Jim |
5th Apr 2017, 11:02 am | #2 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,800
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Re: Please identify Woden mod trans
An audio generator and voltmeter will allow you to measure the turns ratios, which might help.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
5th Apr 2017, 11:31 am | #3 |
Octode
Join Date: Jan 2004
Location: Southport, Merseyside, UK.
Posts: 1,156
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Re: Please identify Woden mod trans
Have you seen this VMARS page? All the sizes are listed there.
http://www.vmarsmanuals.co.uk/archiv...ansformers.pdf John |
5th Apr 2017, 11:33 am | #4 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Please identify Woden mod trans
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5th Apr 2017, 11:38 am | #5 |
Heptode
Join Date: Jan 2003
Location: Tewkesbury, Gloucestershire, UK.
Posts: 690
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Re: Please identify Woden mod trans
The weight should be a giveaway - 15 or 41 lbs!
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Keith Yates - G3XGW VMARS & BVWS member http://www.tibblestone.com/oldradios/Old_Radios.htm |
5th Apr 2017, 1:22 pm | #6 |
Octode
Join Date: Oct 2008
Location: Littlehampton, West Sussex, UK.
Posts: 1,465
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Re: Please identify Woden mod trans
Thanks folks for your ideas. I hadn't seen that spec.sheet despite searching for some time.
It's a UM3 and weighs 15 lbs, the easiest way to identify it. I hadn't realised either that a UM4 was so big, no mistaking one when you try to lift it. I think mods that this thread could be weighed out, thank you. Jim |
5th Apr 2017, 2:40 pm | #7 |
Octode
Join Date: Nov 2010
Location: Ross-on-Wye, Herefordshire, UK.
Posts: 1,648
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Re: Please identify Woden mod trans
I wonder if Woden ever sold any of the UM4s in the UK? I've never seen one myself. Its ratings (250W audio power) are way above anything legal in the UK for amateurs at the time that AM was popular (well that still applies of course). So they must have been aimed at the commercial market - but I've not seen a transmitter which has one fitted.
Richard |