[R-390] Collins PTO Linearity adjust

[Pete Williams]

G'Day List...having rejuvenated a couple of  Collins 70-H2 pto,is there info
available as to how best adjust the internal cams for linearity.?

I have read Ray Osterwalds comments ex past issue of ER but this only
addresses the 100kHz -one  turn of the shaft-calibration points.

It would seem to be  laborious process to adjust these cams as there are in
excess of 60 for the  complete travel of the  core, although, they are not
all required for  adjustment for the 1 mHz  range .

How the factory did it is one thing-- how one might do it now is  another

My preliminary excursion into this finesse  appears to show that adjusting
at the 100kHz points seems to take reasonable  care of what's in between,
bit I'm sure there was a bit more to it, albeit labor intensive .
A bit more light on this would be  appreciated.
Tks 
Pete VK3IZ