[GreenKeys] high speed LRPE2 reperf ??

[Nick England]

The 28 line has a thousand options for every piece of equipment. Evidently
an Analysis Chart would tell you what options were in an LRPE2, but that
chart hasn't turned up yet - they must have been kept under lock and key at
the factory! The Analysis Charts that I have seen (thanks to Jim Haynes)
are at
https://www.navy-radio.com/tty/apparatus.htm
On that page I started a chart of apparatus code to feature, but it has
many many blanks spaces.

Nick England K4NYW
www.navy-radio.com


On Wed, Dec 1, 2021 at 10:55 AM Duncan Brown <duncanancy at earthlink.net>
wrote:

> 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.
>
> See page 4 of
> https://www.navy-radio.com/manuals/tty/jh/ttyman7/TeletypeManuals/model28/573-119-800TC-Iss1.pdf
>
> John, W9DDD
>
>
> On Dec 1, 2021, at 4:43 AM, Duncan Brown <duncanancy at earthlink.net> wrote:
>
>
> 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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