[GreenKeys] M28ASR perf question

[John, W9DDD]

The 2019 Dayton haul ASR has that terminal strip with nothing 
connected.  Recall that the BSP would imply Bell system applications.

On a whim I fired up the ASR punch in the T position and held the space 
bar down.  Sounds like a machine gun!

I once did a calculation on the shaft speed to the punch.  I can't find 
my notes nor recalculate it.  I think I came up with 900 rpm.  I don't 
remember where I got the number of teeth on the shaft with gear in the 
bearing bracket assembly.  It's not in the master index of part numbers 
like they show for plain gears.  I guess I could get the spare in the 
garage and count.

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

On 2/28/2022 7:51 AM, Nick England wrote:
> I figured John would find an electrical connection. But note it is to 
> C171-C172 only - I’ve never seen an ASR with that extra set of 
> terminals 151-180 added.
> But they might have been included on the USAF AN/FGC-58 which included 
> a keyboard reperf as standard.
>
>
>
> On Mon, Feb 28, 2022 at 8:19 AM John, W9DDD <w9ddd at tapr.org 
> <mailto:w9ddd at tapr.org>> wrote:
>
>     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.
>
>     ---
>     ----
>     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
>     >
>     >
>     >
>
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> -- 
> Nick England K4NYW
> www.navy-radio.com <http://www.navy-radio.com>

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