[R-390] PTO....Coming and Going

[KC8OPP Roger S.]

Hope that one of the learned masses can help with this
PTO.

I have a Collins 70H-2 PTO in an R-390 (real radio). 
It stopped working last week, so out of the rack and
on the bench it went.  New tube and it is back in
operation, so decided to check the end points.  With
just a bit of tweaking I was able to get 3455.247KHz
at 000, and 2455.009 at +000. 

When I checked the 100KHz points from 000 to +000 the
values were all over the place, as much as 1.998KHz
high but when I checked it starting at +000 and going
to 000 the freq was never more that 243 Hz out of
bounds.  The problem seems to be connected to the
corrector stack and cam follower some how catching and
hanging up when going from 000 to +000.

Maybe I should just sneak up on all of the frequencies
from the top down.

Anyone have any words of wisdom?  Any cautions about
adjusting the corrector stack?  What lubricant (if
any) should I use on the lead screw and corrector
stack?  And finally, how do you get all of that
fiberglass insulation back in the can?!!!

Thanks for your comments in advance.

Roger
KC8OPP



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