[GreenKeys] high speed LRPE2 reperf ??

[Nick England]

I can’t think how a 28 reperf could go faster than the driven gear. One
rotation of the clutch shaft is one character.

Quick speed check - let it run open for 10 seconds and see how much tape it
punches.
I think 100wpm is 10 char/sec is 1 inch/sec
If you get 20” of tape in 10 seconds then you have 200 wpm gearing (not
uncommon for cross-office traffic).

What gets punched for Y? If double speed I think you’d get
01100 01111

Aren’t teletypes wonderful puzzles?????

Cheers
Nick

On Wed, Dec 1, 2021 at 9:43 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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-- 
Nick England K4NYW
www.navy-radio.com
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