John,
Thanks! that could be the explanation. I see on the parts list
different p/n for the cams for single and two cycle operation. But
not very obvious just looking at the reperf. I would think that
there would be a reference to LRPE2 somewhere that it is two cycle
and will therefor give you twice the speed you would normally have.
I'm not very familiar with the workings of the M28 line. The ones
I've had just worked and I didn't have to do anything to them. I'm
more familiar with the M15 and Kleinschmidt machines. (KLI machines
always had two cycle selectors.)
Thanks for the pointer to Bul 255B. That talks a little about the 1
and 2 cycle units. But doesn't tell how to identify them or mention
LRPE2. It implies Fig 1-4 & 1-5 show the two units. But they are
different views and both are labeled "Two-Cycle"!
Tom - I'll check the clutch when I'm at the Museum next Tuesday.
do you have a source for 200wpm signals?
Thanks,
Duncan
On 01-Dec-21 10:20, John W9DDD wrote:
Perhaps it has 2 cycle cams? So it processes two characters
per omemraotation of the shaft, check the parts section.
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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