[R-390] setting the PTO endpoints (long)

[David Wise]

Thanks, Ed!

So you can even do Cosmos linearity in the radio, though it's
hard.  How about a frame to suspend it a foot or so off the
floor, and you go in on a mechanic's creeper?  Of course the
consequences are dire if the frame isn't solid...

Were you able to use the same tool for linearity and endpoint?
I seem to remember that Cosmos used more than one screw-head type.

Dave Wise

-----Original Message-----
From: DJED1 at aol.com [mailto:DJED1 at aol.com]
Sent: Tuesday, March 10, 2009 2:27 PM
To: David Wise; R-390 at mailman.qth.net
Subject: Re: [R-390] setting the PTO endpoints (long)

Yep, adjustments can be done with the PTO in the radio.  As  noted, I removed
the PTO to take out the nut which covers the adjusting screw,  then used a
cut down jewelers screwdriver to do the adjustment.  I even  went one better and
did all 42 adjustments on a Cosmos with the PTO in the  radio.  In that case,
adjustment was unmanageable while pulling the PTO  out, as I was trying to
get resettability to 100 cycles or so.  It was a  case of doing it in the radio
or making a special test fixture.  But it was  an undertaking, using a small
mirror to see where the slot was on each adjusting  screw.  By the time I got
done, I swore I would do whatever it took to  build a test fixture next time.
Ed