[GreenKeys] Army Model 15 TG-7-B (aka Model 15 Decatur)

[Mike Douglas]

So it looks like the two 105 ohm coils in series at 60ma was a very common configuration for the model 15. I’ve empirically determined the total inductance of the selector magnet coils is about 2H (i.e., 1H per coil).

Has anyone seen Teletype documentation that specifies the recommended time to reach full current (space to mark) and time to zero current (mark to space)?

Mike

> On Dec 22, 2020, at 7:14 PM, Mike Douglas via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> The subject teletype has the pulling style selector with the coils in series. This matches the drawings I have found for this model. This gives a 210 ohm selector magnet resistance versus the 55 ohm resistance I’ve seen most hobbyists refer to (parallel coils). Does anyone know if this configuration still ends up at about 4H total inductance people describe (e.g., 2H per coil), or is this configuration actually 16H? 
> 
> Mike
> 
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