[GreenKeys] Stateside i-Telex status report.

[Duncan Brown]

Jeff,

QSL - I was just thinking about machine to machine or computer to 
machine. If you had a 45 b machine and a 50 b machine talking to each 
other directly, everything would be fine, even without adjusting the 
Range controls (as long as you are not going through miles of wire!).

But the "computer" of the i-telex interface board will assume a specific 
speed from the keyboard and probably can accept a very small amount of 
speed variation.

I didn't realize that the i-telex board had speed conversion, but it is 
logical that it does. (I have a 50 b Siemens T-100 telex machine that I 
was planning to use on i-telex, so I wasn't thinking about that type of 
speed problem.)

Having the i-telex communicate with multiple (local) machines all on the 
same speed makes sense, also. I was not thinking about that set-up.

have fun,

Duncan
K2OEQ


On 29-Mar-16 21:33, Jeffrey D Angus wrote:
> 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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