[R-390] Excessive backlash in BFO pitch control

[Tom Norris]

Try loosening the bushings both at the IF deck and the front
panel to make sure there isn't any binding, then take a good look
at that coupling and make sure the setscrews are tightened and
there are no cracks in the body of the coupling. A crack or break
can cause the shaft to turn fine one way, but not so fine the
other.

Tom

On Jul 17, 2005, at 2:08 PM, Tim Shoppa wrote:

> One of my IF decks has excessive backlash in the BFO pitch control.
> e.g. if I'm turning to the right, it zero beats at "0", but if
> I'm turning to the left, the zero beat is closer to "+1".
>
> Mechanically, I see an accordion-type coupling between the shaft and
> the reactor.  Is this where I should be concentrating my effort, or  
> should
> I be looking inside the variable inductor itself?
>
> Alignment between all the shafts is less than peachy, too.  But I
> cannot see how this would give more than a tiny bit of backlash.
>
> Tim.
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