[GreenKeys] Loop supplies

[Jack]

ZCZC

 

HAL made a custom transformer for their ST5 and ST6 TU’s with

tapped 24V and a 120V secondaries.

 

When I got my Model 26 I was 13 years old. I made up a test loop

supply with a diode, capacitor and series resistor…right off the

110VAC line!  Transformer? What’s a transformer…? Fortunately,

I lived to tell the tale.

 

Jack K2TTY

 

NNNN

 

 

From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of David Effa
Sent: Wednesday, May 18, 2016 9:45 PM
To: GreenKeys at mailman.qth.net
Subject: Re: [GreenKeys] Loop supplies

 

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 <mailto: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 <mailto:greenkeys-bounces at mailman.qth.net> > on behalf of ken Schwieker <ksweek at mindspring.com <mailto:ksweek at mindspring.com> >
Sent: Wednesday, May 18, 2016 3:28 PM
To: GreenKeys at mailman.qth.net <mailto: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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