[R-390] R-390 Mechanical Alignment

[thoyer]

Cecil, 

You are correct, it is my typing that is bad - not enough zeros (same could
be said for my paycheck!)

Just finished going through the mech alignment at 02 000. Someone was in
there before as two of the 
Bristol head screws were fairly stripped. I was able to get them out and
found some replacements in one of my spare parts boxes.

Onward and upward!

Tom
W3TA 

-----Original Message-----
From: Cecil [mailto:chacuff at cableone.net] 
Sent: Monday, February 22, 2021 8:08 PM
To: thoyer
Cc: R-390 at mailman.qth.net
Subject: Re: [R-390] R-390 Mechanical Alignment

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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