[R-390] 7 +000 alignment

[David Wise]

Don't sweat the cam alignment - it's not at all critical.
As long as every cam is on its front, or active side at
all frequencies for which that cam is used, it's probably
fine.  The cams are spiral-cut, which means that the lift is
proportional to the angle.  As long as the slug adjusters are
able to total up the proper lift, there will be no degradation
in tracking.  This is very different from most radios, and comes
from Art's insistence that it tune linearly.  It's also documented
in the Final Engineering Report, which is available on the R-390A
FAQ site.

73,
Dave Wise

> -----Original Message-----
> From: KC8OPP Roger S. [mailto:kc8opp at yahoo.com]
> Sent: Wednesday, August 10, 2005 10:05 AM
> To: R-390 at mailman.qth.net
> Subject: Re: [R-390] 7 +000 alignment
> 
> 
> Collin,
> 
> This may not be too elegant, but I have done this once
> or twice.  With a straight edge and a pencil, extend
> the lines to a point where you can see them.
> 
> I seem to remember that the hole in the cam is in line
> with the point, but that is an old memory talking!
> 
> Good Luck
> 
> Roger
> KC8OPP
> 
> 
> --- n4tua at aol.com wrote:
> 
> > Hello Friends,
> > I have a question concerning the mechanical
> > alignment at 7 +000 of the 
> > cams. My Motorola has lines but they are not long
> > enough to be seen 
> > through the holes. My question is: Does the tip or
> > high part of the cam 
> > line up the same as the hole? In other words can I
> > use the tip of the 
> > cam to line up with the line? Or is it that
> > critical? I can see how the 
> > hole can be very accurate alignment, but that line
> > is not real fine. 
> > Any help would be appreciated. I have the gear train
> > cleaned, deburred 
> > and back together, and am working on the mechanical
> > alignment now.
> > 
> > Progress at: www.hometown.aol.com/n4tua/main.html
> > 
> > Thanks, Collin
> >
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