[GreenKeys] ROTR local loop?

[Russ Miller]

Eugene,

Maybe,  I've confused the separate under-the-dome LPR with the Typing
Perforator that sits next to the keyboard.

Here, the local loop for my Telex machine is always on as Telex was an
unattended service.

Hope that helps!

73
Russ


On Thu, Nov 24, 2022 at 7:53 PM W2HX <w2hx at w2hx.com> wrote:

> Hey Russ (and everyone) happy thanksgiving. I had a question for you.  You
> mentioned that the LPR receives traffic (over the line) in KT or T modes.
> Doesn’t that prevent you from punching tape while you continue to print the
> traffic? I’ve always heard about reading the traffic and simultaneously
> preparing a response on tape.
>
>
>
> My set up is a little different but gives a similar result. I have a
> separate switch mounted below the TD that changes which loop the LPR is
> connected to. With the switch “off” it is on its own local loop, runs
> “closed” and keeps silent. With the switch set to “on” it puts the LPR in
> series with the main loop and begins punching the incoming traffic.  The
> only problem I have with this (and this problem has been unsolved for 15
> years) is when I stop printing from the loop and select KT or T some bits
> are often stuck. The main knob is supposed to reset all of the code bars
> but doesn’t. Never been solved all these years. Quite a mystery. I am sure
> I am missing some kind of piece of mechanical wizardry but never figured it
> out.
>
>
>
> Another question for you, Russ. I’m wondering if your LPR also punches 3
> or 4 holes when you turn off your ASR? Mine does because when the power is
> shut down, the motor begins spinning down but the loop is immediately shut
> off. So for a few revolutions of the LPR motor, the LPR runs “open” and 3
> or 4 positions advance. Does yours do the same?
>
>
>
>
>
> 73 Eugene W2HX
> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
>
> *From:* Russ Miller <wa3frp at gmail.com>
> *Sent:* Wednesday, November 23, 2022 7:45 PM
> *To:* W2HX <w2hx at w2hx.com>
> *Cc:* Greenkeys <greenkeys at mailman.qth.net>
> *Subject:* Re: [GreenKeys] desktop LPR local loop?
>
>
>
> Hi Eugene,
>
>
>
> I have a Teletype Model 28 ASR on the u-Telex network that operates in a
> way that is similar to what you are looking to do.
>
>
>
> In my machine, the Line Printer (LP) and LPR have their own selector
> magnet driver (SMD) cards.
>
>
>
> The K-KT-T switch either keeps the loop to the LPR in mark hold (in K) or
> let’s the LPR receive traffic (in KT or T)
>
>
>
> Works like a charm when you want to save an incoming message to paper tape.
>
>
>
> Russ WA3FRP
>
> I-Telex 834-328 WUTMPAM CHIL
>
>
>
> Sent from my iPhone
>
>
>
> On Nov 23, 2022, at 6:01 PM, W2HX <w2hx at w2hx.com> wrote:
>
> 
>
> Hi all,
>
>
>
> I am doing more in the shack these days and putting more time into my
> teletype set up. I have an M28KSR and M28ASR and one desktop printing
> reperf (LPR ?). I find it would be convenient to be able to put the LPR
> into mark-hold mode while the other machines type away. But to do that, I
> would need a separate loop supply and switch the LPR between the main loop
> and a mark-hold loop. My ASR has something like this. The internal LPR can
> be driven either by the keyboard or the loop. I have a switch under the TD
> that allows me to turn the internal LPR on or off. When turned off, it
> doesn’t run open because there is a loop supply. The ASR has a LESU of some
> kind in the cabinet that makes this all happen, IIRC.
>
>
>
> The question is, am I the only one who thinks a local loop for the desktop
> LPR would be a useful thing? Did they ever make such a beast? And finally,
> I assume since it is just mark hold, I could cobble up something simple to
> provide 60mA where the voltage would not be that critical?
>
>
>
> Any thoughts or suggestions?
>
>
>
>
>
> 73 Eugene W2HX
> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>
>
>
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