[R-390] R-390 end-point adjustment

[Bill Smith]

Hi, have a R-390 non-a with a Collins 70H-2 PTO, with mod.

This one is out a bit, and I have attempted to adjust the end point.  I have
removed the cover from S701.  Inside is a hollow, threaded cylinder.   The
cylinder seems to be threaded inside and out.  Slots are cut in the end of
the cylinder presumably for screwdriver adjustment.

I have attempted to rotate this adjustment, but it appears to be locked in
position.  I used a small mirror to see if there was any other adjustment
inside the cylinder or a locking nut.  None found.

The low point of the PTO (at 000) can be set to 3.455 KHz.  The upper end
then measures 2.467 KHz.

Any ideas?  I'd hate to force the adjustment any further without knowing I
won't break anything!

73 de Bill, AB6MT
billsmith@ispwest.com