[GreenKeys] M28ASR perf question

[John, W9DDD]

Very good point.  At one point in time I could do very fast bursts of 
speed on the Smith Corona portable electric (wonder which of my siblings 
has that now or if it died).  I could probably average 30 wpm.  Later 
when I started playing teletypewriters, I found it very difficult to 
maintain anything near the speed of the typewriter.  The first thing I 
noticed was that you had to have a very steady rhythm to get the max 
speed. So having a perforator (or two shaft reperforator like the ASR) 
capable of a higher speed allows those bursts that naturally occur on 
certain words and you get a higher average.  I'm not sure if those 
bursts are muscle memory or just convenient key locations. Perhaps 
both?  Now I find my max speed on a 28 is by hunt and peck because I've 
lost that rhythm to do touch typing.

As for the electrical connections for the keyboard reperforator selector 
magnet, I've only found one reference.

https://www.navy-radio.com/manuals/tty/573-117-400-iss6-6910.pdf page 7 
shows selector magnet connected to C171 and C172 of the ASR cabinet.

On the other hand the dome mount (aka auxiliary) reperf gets its own 
LESU12 mounted in the belly of the beast.

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 2/28/2022 12:28 AM, Jim Cooper wrote:
> On 27 Feb 2022 at 21:44, John, W9DDD wrote:
>
>> Wouldn't electrical switching
>> accomplish the same?  Like a patch
>> panel, but with a rotary switch.
>> Printer in the external loop. The
>> reper and keyboard in a local loop.
> As I mentioned before, keep in mind
> that these machines were designed and
> wired for BUSINESS CUSTOMERS ....
> who did not use them the way hams use
> them ...   what if they wanted to kbd chat
> with the other terminal?
>
> The MAIN reason it was done mechanically
> was mentioned by someone earlier ... the
> mechanical connection to the keyboard allowed
> the perf to operate MUCH faster than the
> loop signal, even faster than 100wpm if the
> operator could type that fast.  and when
> properly aligned, did not depend on square wave
> quality or adjust ment of the range finder or
> anything else -- it's a direct mechanical connection.
>
> jc
>
>
>