[R-390] Dumb Mechanical Alignment question

[Barry]

It might be even "safer" to set the counter to 7.500mc and adjust the PTO to 2.955mc.  That would put you in a safer section of the PTO's lead screw.  From there you could set the counter to 7.000+ with some confidence you'd not run into anything.  That way, the cams and other details could be checked as well.

73,
Barry - N4BUQ

> I agree with this.  Once the PTO is in sync with the counter, the counter is in
> sync with the cams, and the crystal oscillator's switch is in sync with the
> counter and cams, then finding why things are not working is a more logical
> thing to do.  It doesn't make much sense to do much else until those conditions
> are met.
> 
> Good luck with it!
> 
> Barry - N4BUQ
> 
>> Paul,
>> I believe that all your sensitivity problems lies just there: your PTO is
>> ~261KHz OFF from the value it is supposed to be.
>> I cannot explain how BC band stations could be at "the right place" on the dial,
>> but the whole radio cannot work properly if the range of the PTO is ~262KHz
>> higher than it is supposed to be.
>> As Barry suggested, lock the KHz dial to 000 and turn the Oldham coupler and the
>> PTO shaft clockwise until the measured PTO output is at 3.455 MHz.
>> OR (highly preferable), lock the KHz shaft to the +000 position and turn the
>> Oldham + PTO shaft clockwise until the measured output is 2.455 MHz.
>> Why is it preferable? With the dial at 000, your PTO output is already ~2.5
>> turns too far and internally the anti-backlash mechanism of the lead screw is
>> very near to hit the rear holding plate. Believe me, YOU DO NOT WANT THIS TO
>> HAPPEN.
>> 
>> 73, Jacques, VE2JFE in Montreal
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