[R-390] Cam Synchronization

[odyslim at comcast.net]

 I would leave it alone. 1/8" is practically nothing. In fact, the person that last
serviced the radio may have deliberately moved the cam a little to keep the
slug screws from hitting the utah plate after alignment. The slug racks can
easily compensate for 1/8 on the cam.

  SCott
 


 -------------- Original message ----------------------
From: wabate <wabate at verizon.net>
> Hi.  I'm working on a newly acquired 390A and I've started with the 
> mechanical synchronization.  I've worked on 390A's before but this is 
> the first that is slightly off sync. Four of the cams were off no more 
> than 1/8" so I decided to touch it up.  The other two cams were OK.  I 
> adjusted three but I'm stumped on the 8-16MC cam.  That cam does not 
> have a non-mar clamp on it.  Its riveted to the gear.  How do you adjust 
> that cam?  The manual does not say anything specific about that cam.  It 
> appears that the MC shaft controls it but I don't want to guess wrong 
> and adjust something that I should not.  The 8-16MC cam is off about 
> 1/8" from where it should be.  Should I ignore it?  If I try to align 
> that cam with the KC shaft, I get to the end stop before it lines up. 
> Over ten turns stop readout of the KC shaft is within spec and the 
> crystal osc. band switch is OK.  The intermittent switch drive is off 
> about one tooth from where it should be but the the six position RF band 
> switch alignment is OK.
> 
> Thanks,
> 
> Bill, K3PGB
> 
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