[GreenKeys] Northern radio TU type 174 model 1 and RTTY questions

[John D. Kopke]

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>Hello All , Does anyone know about this model , if it has a loop supply . It has a 
>milliamp meter on the front panel o-70 ma scale  labeled "output current" and an 
>adjustment pot. I know  this seems like a dead give away.  but if it does  have a 
>loop where does it  connect to . On the back terminal strip I see input line 1 and 
>2 and output plus a ground.  I recently hooked up the input to a r-390a and 
>received some ARRL bulletins . The scope had the  mark and space pattern on it as 
I 
>tuned the bfo knob . Very exciting! I ask all these things because I am new to 
>rttyand don't have a manual for it. I would benefit from the experience all of you 
>have .I'm working next on a M28 KSR that looks operable ,but has  disconnected 
>relays in the LESU . I will probably use a UGC-129 at first when I get the 
>connectors ,believe it or not their out there according to William Perry Co. , 
>(Nice Guys  )  All the Best
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