[R-390] R-390 Mechanical Alignment

[Cecil]

It’s 02 000

2mhz not 200khz.

Sent from my iPad

> On Feb 22, 2021, at 6:25 PM, thoyer via R-390 <r-390 at mailman.qth.net> wrote:
> 
> Silly me, I thought there would be a pdf of one out there in cyberspace -
> none that I could find. 
> 
> That's ok, now that I know the pic is correct for 0200 I'm good to go.
> 
> Tom
> W3TA
> 
> -----Original Message-----
> From: Jacques Fortin [mailto:jacques.f at videotron.ca] 
> Sent: Monday, February 22, 2021 2:22 PM
> To: 'Thomas Hoyer'
> Cc: R-390 at mailman.qth.net
> Subject: RE: [R-390] R-390 Mechanical Alignment
> 
> Hello Tom,
> 
> If ever you can find the Collins R-390 1953 manual (on line or in paper)
> please tell me.
> I once searched it on the web, but never been able to found it.
> However, I had an original copy in hand in 1983 and "photocopied" it.
> I found my R-390 in a local "army surplus" store in 1982.
> I used it as-is at the time, but it was left is storage from 1985 to 2018 !
> I then began to restore it.
> Final alignment and modifications were performed last December !
> 
> For the "proof-in-the-pudding": when the KC display shows "000" the PTO runs
> at 3.455 MHz, so the 2nd IF have to be tuned at 3.000 MHz to provide a 455
> kHz IF.
> So the tuning slugs have to be OUT of the coils.
> At "999" the PTO runs at 2.454 MHz and the 2nd IF at 2.001 MHz so the slugs
> have to be IN the coils.
> This matches the position of the 2nd IF cams in the pictures for the "000"
> position, contradicting the text.
> 
> 73, Jacques, VE2JFE in Montreal
> 
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