[GreenKeys] desktop LPR local loop?

[Nick England]

Well, Jim, maybe you were successful after all since Teletype Corp sold
thousands of machines to the US Navy with +/-6v signaling and a selector
magnet driver.
https://www.navy-radio.com/manuals/tty/311B-RF-v3-6910.pdf

Cheers
Nick K4NYW

On Thu, Nov 24, 2022 at 6:48 PM Jim Haynes <jhhaynes at earthlink.net> wrote:

> Something I tried unsuccessfully to sell at Teletype was that every
> selector magnet should have a
>
> low voltage transistor selector magnet driver with an input level
> something like RS-232, operated by
>
> voltage rather than current.  Something I later did with some of my own
> machines was to have a
>
> 120V 60ma selector magnet driver on every selector magnet and again with
> some kind of voltage
>
> rather than current input to the SMD.  At one time this was grid voltage
> for a vacuum tube SMD,
>
> and later something like RS-232 with a transistor driver.  Doing this for
> myself turned out to be more
>
> work than I was willing to put into it.
>
>
>
> Jim W6JVE
>

-- 
Nick England K4NYW
www.navy-radio.com
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