[GreenKeys] Tuning fork - 123 Hz

[Duncan Brown]

Most series-governed TTYs  have some illumination over the target wheel 
(unless ambient is sufficient, like most Kleinschmidts).  The light is 
just for illumination, the strobe comes from the tuning fork.

-...-

The other day, I needed to check the speed of our TG-7 (military M15) 
machines.  I remembered seeing a tuning fork in a Teletypewriter 
Repairman's Tool Case that had come into the Museum recently.  Sure 
enough, there was a tuning fork in the kit, but it was 123 Hz.

I thought it might be for the German 50 baud machines, but then I found 
that they used 125 Hz.  I tried the 123 Hz fork on a German T63 we have 
and it did not stop the bars on the motor, so it is not close enough.

Anyone know what a 123Hz fork would be for??

Thanks,

Duncan
K2OEQ

(I did find a 87.6 Hz fork to check  the TG-7)


On 27-Feb-16 14:35, Henning Treumann via GreenKeys wrote:
> German tuning forks for 50 baud are generally 125 Hz, no matter
> what machine or motor.
> From own experience it even works with a battery powered flashlight.
>
> Later Lorenz Lo15 models (versions b and c) also had to lamp installed 
> near the
> governor to give more convenience when measuring the speed.
> In Germany 99% of all machines are equipped with a governed motor.
>
> Henning DF3OE
>
> www.teleprinter.net <http://www.teleprinter.net>
> i-Telex: 55571 and 92612
>


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