[R-390] Cam alignment

[Paul Roche]

That’s not really what I was talking about but that’s OK. I got everything back together. All cams set for 7.000+ except now the “frequency wheel” reads 9, not 7 and I can’t turn the MHZ knob to get to 0; the detent before the “full stop” is 1 MHz and the wheel reads 3. I guess my 10 turn stop is off; this will require thinking and reading. I hope I don’t pull the whole RF deck off again. 

This is not enjoyable. I think I’ll put this thing back together, put it on a shelf, and maybe after a few weeks or months come back and revisit this. It’s really more mechanical than electrical and that’s not so much fun right now because I’ve got a radio that’s a whole bunch of gears and I just don’t know how to get everything synced up right. Oh well, the price was right. Free
Sent from my iPhone

> On Aug 1, 2026, at 3:25 PM, Jordan Arndt <Outposter30 at shaw.ca> wrote:
> 
> Paul....
> 
> I think you're referring to the PTO travel visa-vis the 10 turn stops, which should allow for +/- 20-25 khz  of over-travel at each end. It is also important that the PTO is centered within the Dial Adj. range...
> 
> 73...Jordan VE6ZT
> 
> 
> ----- Original Message ----- From: "Paul Roche via R-390" <r-390 at mailman.qth.net>
> To: "Barry SCOTT" <n4buq at knology.net>
> Cc: <r-390 at mailman.qth.net>
> Sent: Saturday, August 01, 2026 1:10 PM
> Subject: Re: [R-390] Cam alignment
> 
> 
>> I am sure I am wording my question incorrectly! I thought I remember reading somewhere that when turning the MHZ dial it should be maybe 1/4 turn until it hits the first detent at 0.000 MHz I was just wondering if I don’t set it in the detent at 7.000+ would I still have some range a little above and a little below the ends of the bands. As I said, I’m probably not making it clear,
>> Sent from my iPhone
>> 
>>>> On Aug 1, 2026, at 1:44 PM, SCOTT Barry via R-390 <r-390 at mailman.qth.net> wrote:
>>> 
>>> I'm not completely sure I'm following your question, but the detent position only changes with the MC change knob's rotation so at 7.000+ MC, the spring should still be in one of the detents regardless of the rotation of the KC change knob.
>>> 
>>> Again, I might be misunderstanding the question.
>>> 
>>> Barry - N4BUQ
>>>> I am trying to align my cams to exactly 7.000+ MHZ and I have a question about the planetary gear with that spring. I thought I read I should install it with the detents halfway between the spring position. But if I do that, now when it hits the detent, it is not 7.00+ anymore.
>>>> When I’m putting this together, should I install that planetary gear with a detent engaged at the 7.000+? I hope this makes sense.
>>>> Sent from my iPhone
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