[GreenKeys] WU 28ASR WIRING

[John Hargett]

Getting thru my 28ASR that I got some time back.  Have it receiving ITTY 
now, able to also punch tape, as well as run tape. Have a couple of 
questions that I am sure someone out there has more knowledge than I  ( 
that doesnt take too much) about these machines.  Two items I am looking 
at are:

1)  The LESU, which is a Western Union 9797 wiring cabinet, has the 
positive side of the loop supply tied to ground @  C-2 and the negative 
floating.  What is the design behind this?  I have looked at other LESU 
wiring diagrams and do not see them showing this. Would it be 
detrimental to put the neg at ground potential?


2) When I run tape on the LXD, it comes out all random and missing CR 
and LF .  Ran a tape RYRYRY  and get not RYRYRY on print.  Does not LF 
or CR at correct times.  Tape was preceded by multiple LF and CR then 
LTRS, Ran 40 characters RY, followed by CR,CR,CR,LF,LF, then 40 more RY 
followed by CR, CR, CR, LF, LF, then 40 more RY followed by CR, CR, CR, 
LF, LF.  What i got on type was  a couple of  over types at the start, 
then KCBSCCBSCCBSCCBECCBECCBSCCBER then it did a single LF and continued 
with the same basic characters, then did a CR and same basic characters.

Is this a timing issue with the LXD signal generator?


Dont know if it will come thru, but a copy of the 9797 wiring diagram is 
attached.


Thanks in advance

John

KG5YLG



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