[GreenKeys] Baud rate change

Wed Sep 1 09:21:11 EDT 2021

 "Sadly I only receive some of the Greenkeys emails. "
Paul have you checked your spam folder?
-Steve
    On Wednesday, September 1, 2021, 09:12:28 AM EDT, Paul Heller <paul0926 at comcast.net> wrote:  

 Sadly I only receive some of the Greenkeys emails. The majority never reach my inbox. For some reason, John’s made it through. 
What machine is it? The motor on many of the European telex machines is governed and can be adjusted.

Paul

On Sep 1, 2021, at 7:03 AM, John, W9DDD <w9ddd at tapr.org> wrote:

I have to question that the 2,000 RPM motor is synchronous.  Therefore it is likely a governed motor which could be adjusted down to 1800 RPM.

Where's Henning, he is probably an expert on this if you can provide more details on the EU machine?

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 9/1/2021 7:08 AM, steve bennett via GreenKeys wrote:

Joe,

The easiest way to change the speed is use a single phase variable speed inverter.

This would require no modification to the teletype.

https://www.ebay.com/itm/121462713601?hash=item1c47bded01:g:HP4AAOSw8lxg7UK2

This device takes 60Hz input and you set the output to any frequency you like.

-Steve

On Tuesday, August 31, 2021, 10:13:45 PM EDT, Joe Duszyński <joeduszynski1 at gmail.com> wrote:

I have a European machine that runs on 220v 50hz and the motor speed is 2000 rpm.

Of course on 60hz 220v it runs faster than 2000 rpm  I'm looking to change the motor to a DC motor but would also like to change the baud rate in the process to 45.5 vs the 50 it "was set at" the gear ratio appears to be 5 to 1  five revolutions of the motor to 1 rev of the transmitter/receiver shaft.

Can this be accomplished by using an 1800 RPM motor vs 2000 RPM??

This is the calculation I used to come up with 1800 RPM

22ms * 7.5 bits = 165ms

60000ms(in 1 minute)/165ms = 363.6363 RPM

363 RPM X 5(1:5gear ratio) =1818 RPM

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