[GreenKeys] Baud rate change

[Joe Duszyński]

TO those that asked which machine it is I had replied on that but I forgot
to hit "REPLY TO ALL" so only that individual got the message
here is that reply cut down.........
--------------cut---------
Thanks for the reply, The Teletype is an STA-M67  in Cyrillic (СТА-М67)
>From the sources in Russian it is a Glorious Soviet Engineered invention by
the peoples top scientists....
Their invention would be it has Cyrillic , Latin and some Numbers.....
That all said...
Its a Commie Copy of a Teletype model 14 strip printer modified with a 3
row shift, it has about 60 characters typeable.
The 26 Latin letters. 30 plus Cyrillic and the rest Numbers/figures.

I'm located in the USA hence converting it from 220/50 to 110/60
-----------cut-------------


The VFD that was suggested I think will do the trick for what I want short
term and it will also solve a problem I am having
with a Soviet era computer (it uses the line frequency for timing for the
display output)

Normally on the Russian computer stuff I just build a power supply for it,
all the early computers have external supplies and if you shove the new
dual voltage supply in the ugly soviet external box nobody knows the
difference!!!..

This motor thing for the Teletype is a bit different animal. Past
experience with Soviet era motors on 60hz usually ends badly;
the insulation breaks down on the windings.
Other than a brief test of  about 5minutes to see that the motor on this
unit runs and that it types I have not run it since.
Using the VFD with proper 50hz I'd gamble on running longer until I replace
the motor.......
As with all things Soviet era it will croak a glorious death with magic
smoke (Usually a cap or a resistor )
So long term I want to replace the motor as it will be used fairly
consistently on one of my Russian computers as a printer.



On Wed, Sep 1, 2021 at 11:35 AM steve bennett <raleigh_ranger at yahoo.com>
wrote:

> Adding to what Paul said...
> You will not overheat a 50hz motor by feeding it 60Hz BUT
> because the change in frequency will cause the inductive reactance of the
> motor to increase
> motor may get less current and be sluggish.
> An increase in voltage would compensate but could exceed the rating of
> your motor windings.
> -Steve
>
> On Wednesday, September 1, 2021, 10:47:05 AM EDT, Joe Duszyński <
> joeduszynski1 at gmail.com> wrote:
>
>
> The motor has an odd governor on it with an external box which also
> supplies the loop current the unit does not plug directly into wall
> voltage the wiring goes from the unit into that external box then it(the
> box) plugs into 220v 50hz needless to say its not running at 50 baud its
> running slightly faster because of the 60hz.
>
> If I messed around with the governor and an oscilloscope I "COULD"
> probably get it to run at 50 baud but the motor and that power box won't
> live a happy life being fed 220v 60hz vs its native 220v 50hz eventually it
> will overheat and BBQ.
>
> I'd rather run it either on DC or 110VAC 60hz
>
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