[Ham-Mac] Slightly off topic, history of 850 Hz shift?

[Wolfgang Mahlke]

its just better, or cheaper to realize. ... and they didn´t care  
about the bandwith.
you get less failures with higher shift. We also use 850 Hz on vhf,  
because there is enough bandwith.

but, I do not know, which commission has set up the standard shifts  
(170, 425, 850)

Am 28.09.2006 um 15:45 schrieb Chris Smolinski:

> Someone asked me why much of the military RTTY on HF commonly uses  
> 850 Hz shift. I am curious if anyone knows the history behind the  
> selection of this shift rate, or if it was just arbitrary.
>
> -- 
>
> ---
> Chris Smolinski
> Black Cat Systems
> http://www.blackcatsystems.com
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73 de wolf, df1gw
df1gw at amsat.org