[R-390] Setting GAIN ADJ

[Jacques Fortin]

Well, the link below is for the first R-390/URR manual known.
This is a first "raw" version I put online on Feb. 2021.
A better (restored) version is available for download here:
https://www.royalsignals.org.uk/radio-rx-R390/2460.pdf

73, Jacques, VE2JFE in Montreal

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la part de Jim Whartenby via R-390
Envoyé : 11 octobre 2024 21:57
À : R-390 Mailing List <r-390 at mailman.qth.net>
Objet : Re: [R-390] Setting GAIN ADJ

https://bama.edebris.com/download/military/r390/Collins_R390_1953.pdf

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Friday, October 11, 2024 at 06:16:31 PM CDT, Barry Scott <72volkswagon at gmail.com> wrote:   

 Looking at the older (1955) vs newer (1962) manuals for the R-390/URR, the older one describes setting the GAIN ADJ pot using input directly into the IF deck; whereas the newer one describes setting it using the antenna input jack.  Is one method any better or preferred to the other?

One of the reasons I'm asking is that when I try the direct input to the IF deck method, I can't get -0,7V on the Diode Load which makes me think I have a gain problem in the IF deck.

I know there were several posts about this over the years but I've lost track of those for the most part so I thought I'd ask.

Thanks,
Barry - N4BUQ
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