[GreenKeys] high speed LRPE2 reperf ??

Duncan Brown duncanancy at earthlink.net
Wed Dec 1 09:43:09 EST 2021


I am working on a Teletype Corp M28 RT (thanks Bill!). After cleaning it 
up and lubricating it, I put a signal to the LRPE2 (non-printing reperf) 
yesterday, but it is just punching garble. All the punch pins are 
punching and the punch patterns are repeatable, so I don't think 
anything is sticking.  Adjusting the Range control makes some difference 
in the punches, but still garble.

The fixed receive bracket gears in the LRXB base are what is called for 
in the manual (fig 3) for 100wpm ("A" gear =158700; "B" gear = 158716).

But when I give it 100wpm characters (from a M28 KSR or Heavy Metal), 
the reperf acts like it is running much faster. For example, if I send 
LTRS, it punches 01111, which implies that the reperf is looking for the 
first data bit while it is still receiving the start bit.

If I send Blank, it punches 00000 00001 (punches two characters), 
implying that the reperf is reading two bits for every one that I send.

I know that the cross-office lines in the auto switching centers 
operated very fast - up to 1000wpm.  Is this LRPE2 running at 200wpm?  I 
can't find anything defining a "LRPE2", other than "non-typing reperf"

Thanks,

Duncan
K2OEQ








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