[GreenKeys] Magnet Spice Model

[Bob Camp]

Hi

I wonder if that's 4 H per magnet or 2 H each and 4 H when connected in 
series?

The value isn't to terribly surprising. 4 H and a 2500 ohm resistor 
would give a 1.5 ms time constant. That's plenty fast enough for a 
machine with 22 ms pulses running around in it. May not be quite fast 
enough for low distortion at 100 wpm though. If it was 4 H in series 
and 1 H in parallel it would be just fine for 100 wpm.

I'll do a little poking around and let you know what I find.

	Thanks!

		Bob Camp
		KB8TQ


On May 26, 2004, at 2:34 PM, Tim Swarthout wrote:

> Bob
>
> After doing a little research, it appears that the inductance of the
> selector magnets is around 4 H, as incredible as this sounds! I found 
> this
> information in several excellant articles by Ron Guentzler  which 
> appeared
> in January 1968, and May & June 1969 issues of 'RTTY Journal'.
>
> Please report the results of your Spice Model investigation. Thanks.
>
> Over the years, I have seen many model 28 machines, but I don't ever 
> recall
> seeing one with the keyer tube! Isn't that strange?
>
> Regards to all,
>
> Tim Swarthout, WA5QEG
>