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
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 <[email protected]> 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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