[GreenKeys] Loop electronics - a request for assistance

[WA5CAB at cs.com]

Gil,

That hasn't been my experience, at least with 14/15 family machines.  I once 
tried to run a 15KSR  and then a 14 typing reperf on a loop supplied by the 28 
VDC supply for my T-47/ART-13.  On a local loop keyed by a FOX tape in a 
14TD, the range was less than 10 points with the holding magnet 15 and zero points 
with the pulling magnet 14.  With both in the loop, neither would print error 
free.  So I did it the way the book said and built a 120 VDC supply for the 
TTY's.  

The advantage of a 120 volt loop supply and 2500 ohm rheostat (standard 
shipboard setup) is that you can patch in quite a few machines without affecting 
the range, even if some are quite some distance away.

In a message dated 1/8/2006 11:21:09 PM Central Standard Time, gil at baudot.net 
writes: 
> 
> Be careful with those nasty loop voltages!  I'd opt for 60 to 80V to keep 
> it a bit safer, and keep the heat down, and I'd bet that even 30V would be 
> just fine for most machines.  I have not seen a tty yet that needed 120V.

Robert Downs - Houston
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