[GreenKeys] do the length of stop bits affect clutch wear?

[Duncan Brown]

Ralph,

I was confused, too.  The KL-47 was an off-line machine. It was the KW-9 
which was on-line, but had to step the tape reader one character at a 
time. Possibly the slowed down M28 was another solution to the 
KW-9'sproblem.

There was an HL-1 & HL-1B that could take an encrypted tape and send it 
to a KL-47 for decoding, but it was all off-line.

Duncan

On 11/23/2018 19:17, Ralph Irish wrote:
> *Duncan*
> *
> *
> *Well, I stand corrected about the Crypto MOdel 28s speed.  I thought 
> it was faster.  I won't *
> *make that mistake again!  There  is printer speed and TD speed here. 
>  I suppose a TD could be*
> *slowed down with a few extra milliseconds inserted between each 
> character.  That would reduce*
> *the 'net' speed and allow the printer to operate at a faster 
> (character) speed.*
> *
> *
> *We had a 28KSR with 100 speed gears for our KWR-32 systems.  The 
> first time I saw that machine*
> *run at 100 WPM I mentally gave it about 2 months before it shook 
> itself apart!  Needless to say,*
> *that never happened.  It took me a while to see just how well 
> engineered the 28 was.*
> *
> *
> *We had a Model 19 connected to the KW-26.  Another Model 19 
> interconnected with the PYTHON*
> *system.*
> *
> *
> *Somehow, four AN/URA8A RTTY converters were all that was needed. 
>  They could be split into*
> *two converters each, if necessary.  That probably happened a few times.*
> *
> *
> *Thanks for the correction.*
> *
> *
> *Ralph - W8ROI*
> *
> *
> *-   -   -   -   -   -   -   -*
> *
> *
> *On Nov 23, 2018, at 6:06 PM, Duncan Brown wrote:*
> *
> *
>> *Some of the older, electromagnetical crypto gear (KL-7 ?, KL-47 ? 
>> and earlier) couldn't operate as fast as 60 wpm, so they had to slow 
>> the tape readers down to a speed (40-50 wpm ?) that they could handle.
>> The electronic crypto gear, KW-7, KW-26 could handle 60 wpm and maybe 
>> higher.
>>
>> Duncan
>>
>> On 11/23/2018 14:17, Jim Haynes wrote:
>> *
>>> *Prior to AUTODIN the crypto people for some reason found it necessary
>>> *
>>> *to control the rate of character emission from all the TTY sending
>>> *
>>> *devices.  In the Model 28 parts books you'll see sets of parts to adapt
>>> *
>>> *keyboards to "synchronous pulsed operation".  Sometime in the 1970s I
>>> *
>>> *bought 3 racks of equipment at a surplus sale.  Two of the racks held
>>> *
>>> *regenerative repeaters, and the other held what were called TD pulsers
>>> *
>>> *which simply generated pulses at the character rate to pulse the 
>>> sending
>>> *
>>> *devices.  Beats me why those smart people in the crypto agency couldn't
>>> *
>>> *accomodate the natural output of keyboards and tape readers.
>>> *
>>> *
>>> *
>> *
>>
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