[R-390] PTO alignment

[Tom M.]

The mechanical stops and veeder root counter on the RF deck should be set up
with about 35 kcs overtravel on each end.  

After that, put your dial counter on 000 and set the PTO for an output of 3455
kcs (read on a counter or listen on another receiver for it) and you'll be real
close to proper alignment.  

Doing this you should never hit the stops on the PTO.  The PTO stops are much
weaker than the stops on the RF deck. By design (I guess) the RF deck stops hit
first.

Tom N5OFF


--- Gene Dathe <dathegene at hotmail.com> wrote:

> Well, my pto project was successful and I now have a working spare.  
> Aligning the oldham coupler on the pto shaft took a bit of time, though.  
> With the Khz set at -000, there were 3 1/2 turns left of travel.  That got 
> me within 25 khz, then rotating the oldham coupler on the shaft got the 
> spare within 2 khz of my original.  The point being that I could drop in the 
> spare without having to radically reset the zero.
> 
> It seems to me that as long as the 1 Mhz travel of the pto is within the 
> total mechanical travel between the stops that the radio will work fine, 
> just re-zero for that particular pto.  But say I accidentally installed it 
> with 5 turns on the shaft, up about 200 khz. I couldn't zero it before I hit 
> the end of travel.  Now a fanatic might want to "center" the 1 Mhz travel 
> within the stops.
> 
> My question to those that did this sort of thing for a living is:  Did you 
> have a SOP when installing the pto to mechanically align it?
> 
> 73 de NAØG  Gene
> 
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