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

[Jeffrey Angus]

On 3/30/19 11:13 AM, Harold Hallikainen wrote:
> 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
And that is why Western Union and others set the loop at 130 VDC at 63.5 mA.

-- 
"I am a river to my people."
Jeff-1.0
WA6FWI
www.foxsmercantile.com