[R-390] Cam Synchronization

[wabate]

Thanks to all for their input, especially Don.  I understand now how to 
slip the KC shaft past the endpoint, which is what I had to do to align 
the 8-16.  I reset the other cams and zeroed the Veeder Root counter and 
all looks well.  I appreciate all the help.

Now on to filling in the lettering on the panel and then install it. 
Then I can align the beast.  I'll save the Cosmos PTO for last (endpoint 
is way off!)

73,

Bill, K3PGB

odyslim at comcast.net wrote:
>  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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> 
> 
>