[R-390] Cosmos PTO - No Teflon Disk???

[Jon Schlegel]

Hi all,

Just opened a Cosmos PTO expecting to find a Teflon disk as described 
in "Calibration of the COSMOS PTO"  by Tom Marcotte, N5OFF at 
http://www.r390a.com/html/n5off_pto.html.  I found no Teflon disk 
inside.  Is the disk really missing or is Tom using the idea as a 
visualization technique?

I see that the slug driven by the cam follower is itself 
screwdriver-adjustable.  Among other things, no doubt, I can see that 
this slug's baseline adjustment would affect the sensitivity of the 
linearization adjustments.  Is there any accepted procedure for the 
baseline adjustment of this slug?

Also, the "varnish" on the main coil shows signs of breakdown due to 
either due to mild corrosion or perhaps some sort of fungus among 
us.  About 1/8 of the surface of the coil is affected.  Should I 
attempt to clean/re-coat it or just leave it alone.  If re-coat, then 
with what?

This Cosmos unit is mechanically kind of on the edge - some worn 
surfaces, buggered screw heads, even a bent 370 uuF mounting stud - 
but probably salvageable.


Regards,
Jon Schlegel, WA3MVM