[R-390] Alignment Assistance

[Drew Papanek]

Antero wrote:

<snipped>

>I can at the moment adjust the frequency display to indicate the correct 
>frequency as described in the Operator's manual, but I notice that, using 
>the "zero adj", I end up at the very limit of the KC knob's range of 
>movement without the last three digits of the display changing. More 
>specifically, I can't move the KC knob to the right (higher frequencies).

Cam setting seems to be about right (you mentioned alignment of timing marks 
at 7990 KC).  With zero adjust in the center of its range, can you get about 
35 KC overtravel at both ends of range (7-965 to 7+035)?  If so, then reset 
PTO shaft to receive indicated frequency with zero adjust in center of 
range.

If you cannot get 35 KC overtravel at both ends, reset position of large 
gear on KC knob shaft (with zero set in center).
Then reset PTO shaft.

Of course, it would be desireable to set PTO endpoint adjustment for 1 MHz 
in exactly 10 turns.

The R-390 series tracking preselectors and tunable IF's are quite selective. 
  If you carry the above process too far, sensitivity will suffer.  It would 
be well to electrically align those sections.  In the 1-2 MHz band, for 
example, sensitivity is noticeably reduced when PTO mistracks by 10 KHz.

Drew


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