[R-390] Cosmos PTO

[Tom M.]

I find that the most important thing to do to avoid interaction between the
points is to insure that the screw being adjusted is directly above the
coil/plunger.  This will not necessarily be at an even 25kcs point (unless you
start from scratch and make it so with numerous iterations).

Bonne chance.  
Tom N5OFF


--- DJED1@aol.com wrote:
> That last thread on PTOs got me going on mine.  A couple of years ago I 
> replaced the Progressitron with a rebuilt Cosmos, and aligned the Cosmos at 
> that time.  Over the years it had been gradually shifting, to where some 
> points were a Kc off.  I pulled the radio and went through the alignment 
> again and was very happy with the results.  I haven't set up a jig for 
> alignment, so I use a small screwdriver to adjust the 42 little screws with 
> the PTO in place.  I found this time that I could set each 25 Kc point to 
> within 200 cycles, and that they didn't interact significantly.  I set the 
> end points, then did the fine adjustment.  The result is that I got the PTO 
> to track to 2-300 cycles over the entire range.  I just need to calibrate 
> once for each band now.  The ability to "easily" align the PTO is a 
> significant advantage for the Cosmos PTO.  It took about 5 hours to do the 
> adjustment, with most of the time being spent getting the little screwdriver 
> into the appropriate screw slot!
> Ed  WB2LHI
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