[R-390] Cam alignment

[SCOTT Barry]

Correction.  That isn't the "1/10 kc" wheel, it's the "1 kc with 200 cps 
graduations" wheel.  Obviously I wasn't thinking clearly.

Barry - N4BUQ

On 8/2/2026 1:44 PM, SCOTT Barry via R-390 wrote:
> Now that I think about it (and have looked at mine again), all that's 
> necessary is to remove the escutcheon.  That gives you access to the 
> clamp on the MC wheel which you can then reset as needed. The same 
> could be done for the 1/10 KC wheel if the need should arise.  I think 
> there are some steps in the manual that address this.
>
> Barry - N4BUQ
>
> On 8/1/2026 6:41 PM, SCOTT Barry wrote:
>> If the front panel is out of the way, the counter is relatively easy 
>> to "slip".
>>
>> Barry - N4BUQ
>>
>> On 8/1/2026 5:20 PM, Paul Roche wrote:
>>> 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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