On Wednesday, October 24, 2012 4:51:09 PM UTC-4, Charles wrote:   
   > "GRe"  wrote in message   
   >   
   > news:5087c1e5$0$6871$e4fe514c@news2.news.xs4all.nl...   
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   > Some time ago I found a small transformer in the junkbox.   
   >   
   > It looks old, like from the forties or fifties era.   
   >   
   > I don't remember where it came from or was cannabilized from.   
   >   
   > Anyway, today I took the trouble to measure it.   
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   >   
   > Winding W1:   
   >   
   > Rdc = 32ohm   
   >   
   > Saturation at about 50V, W2 open   
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   > Inductance 8.82H @ 10V/50Hz   
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   > Inductance 6.58H @ 10V/100Hz   
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   >   
   >   
   > Winding W2:   
   >   
   > Rdc = 29ohm   
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   > Saturation at about 37V, W1 open   
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   > Inductance 5.36H @ 10V/50Hz   
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   > Inductance 4.11H @ 10V/100Hz   
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   >   
   > Winding ratio N = 1.34   
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   > Impedance ratio = 1.79   
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   >   
   > F-response -3dB @ 27kHz with a 600ohm load on W2   
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   >   
   > +3dB @ about 80kHz with (almost) no load on W2   
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   > +22dB @ 186kHz resonance with (almost) no load on W2   
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   >   
   > Iron lamination dimensions 48x40x20mm   
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   > It's "tarred" and has NO airgap   
   >   
   > Beside end taps, no additional taps on W1 and W2   
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   > What could the purpose have been?   
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   > Anybody any idea???   
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   >   
   >   
   > Telephone application?   
      
   If it was from telco- then most likely to match 600 to 900 .   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)