[GreenKeys] high speed LRPE2 reperf ??

[John W9DDD]

I don't know of a easy way to get 200 wpm test signal.  Put two cycle cam in an LXD?  I think that existed for the LAXD, otherwise how do you get a low speed to high speed RT set to get the 200wpm?  

Heavy metal puts out signal through serial port?  Wonder if it could be patched to do 200?  I suspect you need a real legacy serial port.

John, W9DDD


> On Dec 1, 2021, at 5:55 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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