[GreenKeys] desktop LPR local loop?

[W2HX]

Thanks Russ. Yes my ASR functions in this way too, you just did a much better job of explaining it!  I am going to pursue a similar idea for the ROTR (thanks, Nick, I knew that was the name but forgot).


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<mailto: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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