[GreenKeys] Stateside i-Telex status report.

[Jeffrey D Angus]

On 3/29/2016 7:57 PM, Duncan Brown wrote:
> Not much difference to a mechanical TTY between 45 & 50 baud.
> Most machines will run fine on either speed, though you can
> optimize things by readjusting the Range control.
Yes and no.

Assume you have two machines. One running 50 baud and one
running 45 baud.
The range control ONLY works on the received signal. It makes no
difference to the transmitted signal.
So....The machine at the far end ALSO has to adjust the range
control to compensate for it sees as the wrong speed as well.

Now, here's the rub, what if the other machine doesn't have a
range control?

The speed of the local (machine) interface with the i-Telex is set
by the i-Telex card. It can be set for either 45 or 50 baud. But you
can't have two different speed machines running off of the same
controller.

The problem is that the keyboard (transmit) signal from the
machine through the interface to the i-Telex card has to be
correct. There is no "range control" on the i-Telex card. Now
while you might be able to adjust the range control on a
machine running 45 baud to print moderately well on the
interface running at 50 baud, you will send garbage. The speed
"margin of error" is closer to 1.0-1.5% max, not the 10% you
have running a 45 baud machine with a 50 baud system.

Now while running "split speeds" might work over the radio, or a
wire line with just two machines talking to one another, this is
definitely not the case with the i-Telex system.

I proved this yesterday when I hooked everything up and forgot
that I had set the Lorenz Lo-15b to 45 baud, and the i-Telex
system I ordered was set for 50 baud. Once I corrected the machine
speed this morning, everything worked perfectly.

When you order an i-Telex system, you have to specify what
speed all the machines connected to it locally  are running at.
And they all have to be the same speed, and the correct speed.
> Good luck with the i-telex.  I'm interested in trying that out
> sometime, also.
I got it up and running, with the exception of getting the local
modem/router port forwarding correctly.
I can dial out, or call back and forth between two machines. That
was today's accomplishment. And I spent at least 1/2 an hour
connected the Henning's machine chatting back and forth.
>
> 73 & have fun,
>
> Duncan
> K2OEQ 


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Jeff-1.0
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