[GreenKeys] Loop supplies

[David Effa]

Is it possible to just use something like was in the original ST-5?  Maybe
the transformer would need to be changed.

http://www.rtty.com/development/tu/st-5/st-5_update.htm

Dave

On Wed, May 18, 2016 at 7:20 PM, Sheldon Daitch <SDAITCH at bbg.gov> wrote:

> Also take a look at:
>
> http://www.tmchistory.org/NorthernRadio/ib_238-1-2_4_8_66.pdf
>
> This could be adapted for use if the loop resistance is changed by
> equipment patching and would be automatic.
>
> 73
>
> Sheldon
> WA4MZZ
>
> ________________________________________
> From: GreenKeys <greenkeys-bounces at mailman.qth.net> on behalf of ken
> Schwieker <ksweek at mindspring.com>
> Sent: Wednesday, May 18, 2016 3:28 PM
> To: GreenKeys at mailman.qth.net
> Subject: Re: [GreenKeys] Loop supplies
>
> Since most of us have a love and a somewhat substantial investment of
> time and money in Teletype machines, seems like a small investment in
> a non-marginal loop supply would make sense.  The transformer
> mentioned in   Cory's post with the dual 115 volt primaries and
> secondaries looks to be somewhat ideal in that it could be wired to
> produce a 60 vac output (primaries in series in 115/120 volt
> countries). The secondaries can be wired as a center tapped output
> feeding two diodes or each winding could be used separately with
> bridge rectifiers for two independent loop supplies producing 75 to
> 80 vdc each.
>
> Ken S
>
>
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