[GreenKeys] Keyboard Reperf Wiring

[Nick England]

In my 28ASR experience and reading, the reperf is NOT hooked into the
K-KT-T switch at all. As with anything Teletype, there are 999 variations.
The "normal" ASR has a perf, not a reperf. (n.b. perf means no selector
magnets). If there is a reperf, it is on a separate circuit and the ASR
treats it like it is merely a perf. Of course, for the reperf you have to
either mechanically clip the armature in the marking position or hook it up
to a loop so it stays marking. Tom's switch schematic looks like a good way
to control an ASR reperf so that you can copy incoming messages to the
printer and reperf at the same time.

The K-KT-T switch shaft has a cam that mechanically engages the keyboard
code bars to the perf punch slides in the KT and T positions. In the KT
position, the keyboard transmitter clutch operates and the tape is also
punched. This operates at 60wpm or whatever your gear speed is.

In the T position, the keyboard transmitter clutch does not operate, the
transmitter stays marking, and the keyboard code bars mechanically activate
the perf. In this mode you can type quite a bit faster than 60wpm and cut
tape while the printer is printing an incoming message. One of the 999
variants has a cam that only activates the perf in T mode, not in K or KT
(that machine had me buffaloed for a while).

http://www.navy-radio.com/manuals/tty/28asr-kt-switching.pdf

Have fun,
Nick England K4NYW
www.navy-radio.com


On Sun, Dec 27, 2020 at 8:40 PM Steve Garrison <steve.n4tty at gmail.com>
wrote:

> OK folks put your thinking caps on.
>
>
>
> Now that I’ve begun to get a handle on how my ASR is wired, I can’t find
> out how the keyboard base reperf is wired in so it responds to signals when
> the K-KT-T control is in the KT position.  The reperf in my machine just
> had 4 wires, two of which got to the series connected selector mags on the
> reperf, just dangling in the back of the ASR.  Not hooked up to anything.
>
>
>
> Ideas welcomed.  And I’ve been unable to find the proper WDs.  How about
> it Nick?
>
>
>
> Steve G./N4TTY
>
>
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