[R-390] R-390 Mechanical Alignment

[thoyer]

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