[R-390] Cam alignment

[Jordan Arndt]

Paul....

Just so you know, the shaft exiting the PTO has a smaller diameter and there 
is normally a split phenolic spacer/insulator that goes into the clamp...

See you when you get back to it....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: Sunday, August 02, 2026 1:38 PM
Subject: Re: [R-390] Cam alignment


> Thanks Barry. Found the KHz shaft gear clamp to the VFO was the wrong size 
> and used thin “shims” to make it “look” like it’s a smaller gear clamp. 
> Needless to say, that KO has failed.
>
> The radio is now up on the top of a storage shelf; that will force me to 
> REALLY want to get back to it when I have to haul it back down.
>
> I will get to it eventually, but it is now too frustrating and this is a 
> hobby, not a job. I DO like to tone on it listening to baseball games, so 
> maybe next time I will pull the RF deck off and remove the springs from 
> coils so settings to 7.000+ is much easier (I did that this time).
>
> In the meantime I will keep my eyes peeled for an RF deck for cheap they I 
> can get some clamps from. Too bad Fair Radio is closed up.
>
> Thanks to all, ESPECIALLY Barry, Jordan, and Jacques. I have been quite a 
> pest.
>
> I will be a pest again soon enough.
>
> Paul
> Sent from my iPhone
>
>> On Aug 2, 2026, at 2:51 PM, SCOTT Barry via R-390 <r-390 at mailman.qth.net> 
>> wrote:
>> 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 ali
>
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