[RTTY] FW: Slightly off topic, history of 850 Hz shift?

[Tom Osborne]

Hi Jan

I remember when we used to look through the tuning fork to tune 
non-syncronous motors.  73
Tom W7WHY



>So you can use a standard 425 Hz tuning fork
>as tuning aid.
>
>73 de Jan - SM5FUG