[R-390] Dumb Mechanical Alignment question

[Paul Roche]

Thanks so much, I might get it back together today and will give it a shot!
Sent from my iPhone

> On Jul 15, 2026, at 10:50 PM, Jacques Fortin <jacques.f at videotron.ca> wrote:
> 
> Hi Paul,
> 
> When the counters are at 07+000 the PTO output have to be at 2.455 Mhz.
> The PTO output change "in reverse" relating to the tuned frequency: if the shaft is turned clockwise, the output frequency decreases, if it is turned counter-clockwise, the output frequency increases.
> 
> 73, Jacques, VE2JFE in Montreal
> 
> -----Message d'origine-----
> De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la part de Barry via R-390
> Envoyé : 15 juillet 2026 22:13
> À : PAUL ROCHE <rochep at comcast.net>
> Cc : R-390 Mailing List <r-390 at mailman.qth.net>
> Objet : Re: [R-390] Dumb Mechanical Alignment question
> 
> Since the PTO tunes from 3455kc down to 2455kc, you should be able to hear it on a general coverage receiver with a BFO.  Be aware that the PTO shouldn't be made to travel very much past those two frequencies.
> 
> Good luck with it.  It sounds like you're almost there!
> 
> Barry - N4BUQ
> 
>> I was home today with Strep throat so decided to just set it to 7+000
>> and remove all gears , using fishing line/hemostats and tape to keep
>> every cam in position, and the re-assembled. All seems good. I dread
>> put RF deco back into the radio only to have to take it out again, but it has to go in at some point.
>> Have replaced bumblebee caps.
>> 
>> Once it is in how do I confirm all is working properly with my PTO?
>> Listen to the PTO with a portable shortwave receiver?
>> 
>> Tightening those clamps is scary since I got this with two broken ones.
>> Sent from my iPhone
>> 
>>>> On Jul 15, 2026, at 8:44 AM, Paul Roche <rochep at comcast.net> wrote:
>>> 
>>> OR now that everything is set to 7+000 do I just carefully remove
>>> gears, try to to move KHZ or MHZ shaft, and re-assemble with gears
>>> in correct positions? That might be easiest. Bandswitch and Geneva gears are at 7+000 right now.
>>> Sent from my iPhone
>>> 
>>>> On Jul 14, 2026, at 8:42 PM, PAUL ROCHE via R-390 <r-390 at mailman.qth.net> wrote:
>>>> 
>>>> Now have my detent spring (thanks to Don) and time to get all set
>>>> for 7.000+. I can pull up all the cams with a tool EXCEPT the
>>>> second cam from the left, it does not have a clamp. How do I set it
>>>> up so it is at the line when I am at 7.000+? Do I just leave
>>>> everthing as it is now (at 7.000), remove gears till I can get at
>>>> it, and then rotate IT to the line and carefully re-assemble gears
>>>> and cams? I am afraid if I do this and go back to full CCW it will NOT stay where I want it when I am finally up to 7.000+.
>>>> 
>>>> Am I missing something obvious? I could set all cams to the marks
>>>> and the counter to 7.000+ and bandswitch correct but then my 10 turn
>>>> stop on MHZ knob would be off.
>>>> 
>>>> Paul
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