[GreenKeys] Loop Power Supply For Use On Model 28KSR - Question

[Harold Hallikainen]

Back in high school, I discovered I could get enough current through the
selector magnets of a model 15 with a 12V supply. But, I also discovered
that T=L/R. With the low series R (I think it was just the resistance of
the selector magnets) kept the current and magnetic flux from building up
during the 22 ms bit time. I ended up using something like 150V with the
loop keyed by a 6L6.

Harold




>  Hi Mark -
> Certainly not with the usual constant voltage supply and series
> resistor.  I've operated a model 15 using a constant *current* supply
> with ~43V of compliance (the maximum voltage available) - this was at 60
> wpm.  I never turned the voltage down to see what the practical lower
> limit was.  If you wanted to run 100 wpm, it would probably take a higher
> voltage...  
> Cheers,
> Keith
>
>     On Saturday, March 30, 2019, 4:34:29 AM CDT, Mark Cooper
> <fixxyourpc at gmail.com> wrote:
>
>  Greetings To One And All !     Although I have not yet performed any
> experimentation, prior to doing so, I thought it may be a prudent idea to
> simply inquire first, prior to spending any amount of time, needlessly,
> as I am certain that, surely, one of you guys probably knows the answer
> already to my question:Â  Is it possible to correctly operate a Model
> 28KSR utilizing a 30 Volt, 60 milliamp loop supply ? Is 30 volts enough
> to properly operate the selector magnets for proper operation ?   
> Â Thank you in advance for any assistance !73, Mark,
> WN3SIX______________________________________________________________
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