[GreenKeys] Model 28 signal lines

[steve.n4tty at gmail.com]

I for one agree with Paul and Jeff!

 

If it had worked at 48V I’m sure they wouldn’t have used 120V.

 

Steve G./N4TTY

 

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Paul Heller
Sent: Wednesday, October 16, 2019 6:20 PM
To: B M <iamvirtual at gmail.com>
Cc: GreenKeys at mailman.qth.net
Subject: Re: [GreenKeys] Model 28 signal lines

 

Barry,

 

My only point, and others may disagree, is that 48v is not enough. 

Paul
W2TTY

ITTY:                      HTTP://INTERNET-TTY.NET:8000/ITTY
AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
EUROPE:              HTTP://INTERNET-TTY.NET:8040/EUROPE





On Oct 16, 2019, at 4:10 PM, B M <iamvirtual at gmail.com <mailto:iamvirtual at gmail.com> > wrote:



Many thanks to all that replied. Now that I know it is necessary to confirm the options that might be in place, I can look closely at my machine and compare against the manuals to determine what I need to do.

 

Thanks!

 

--barrym

 

On Tue, Oct 15, 2019, 12:28 B M, <iamvirtual at gmail.com <mailto:iamvirtual at gmail.com> > wrote:

I took a look through the theory & operation manual for the Teletype Model 28 KSR (floor standing model), but I am still confused on where the signal lines in and out are located.  I do see the 2 terminal strips at the back of the cabinet with labels from 1-20 and 21-40.

 

I have a few questions

1. which terminals are for the signal lines in?

2. which terminals are for the signal lines out?

3. how do I determine that the unit is still set to use 60ma loop?

4. will 48v @ 60ma be sufficient to drive the model 28 KSR?

 

As you can see, I am not familiar with Teletypes. 

 

Any help would be greatly appreciated!

 

Thanks

 

--barrym

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