[R-390] wow... the R-391A does exist - Video Update

[Paul H. Anderson]

There are repositionable locking pawls that stop the main shaft from 
turning.  When the key is locked, it holds the pawls in place, preventing 
the shaft from turning, so the motor is free spinning a small clutch 
inside the positioning heads.

When the key is free, the locking pawls can be changed to allow moving to 
a different frequency.

Paul

On Tue, 11 Apr 2006, n4buq at knology.net wrote:

> Cool video.
>
> I can understand the mechanisms spin back to 0,0 (or 0, -0.9xx), but what
> stops each shaft at the desired frequencies?  How do you "program" a new
> frequency?
>
> Barry - N4BUQ