[GreenKeys] high speed LRPE2 reperf ??

Wed Dec 1 11:44:00 EST 2021

This document lists the Bell system nomenclature for various 28RT units.
https://www.navy-radio.com/manuals/tty/p34.104-5911.pdf
Duncan may have a 28C which is 200wpm receive and gearshift 60/75/100wpm
transmit.

Now where to find Bell code to Teletype code translation? Locked up in the
factory?
Clues can be found here-
https://www.navy-radio.com/manuals/tty/28-we-rs.pdf

Et voila! - here's Duncan's elusive LRPE2
28C REPERFORATOR TRANSMITTER UNIT (Teletype VCL215-LRXB3+LRPE2+LAXD1+LMU11)
This unit is the same as the 28A Reperforator Transmitters Unit except for
the replacement of the typing reperforator with a non-typing reperforator
and its design for receiving at 200 words per minute and sending over the
transmitter distributor at a speed of 60, 75 or 100 words per minute . The
transmitter distributor has an additional distributor auxiliary contact.

For anyone interested, these were developed for use in the 82B1 automatic
routing system
https://www.navy-radio.com/commsta/82b1.htm

Nick England K4NYW
www.navy-radio.com

On Wed, Dec 1, 2021 at 11:10 AM Nick England <navy.radio at gmail.com> wrote:

> 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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