[R-390] Alignment of the Mechanical Filters and IF with a SpectrumAnalyzer

[Leigh]

Mack,

I have a document, ST 32 - 152, "Visual Alignment of Radio Receivers, 
R-390/URR and R-390A/URR", dated March 1969, US Army Intelligence School, 
Fort Devens, MA.  This document describes stagger tuning the IF chain, in 
general and for the R-390 and R-390A.  The procedure uses a sweep generator 
and scope but the same procedure holds (in fact is easier) with a spectrum 
analyzer and tracking generator.

I will take it to work with me tomorrow, scan it, and send you (and anyone 
else) who may want a copy of it.

Happy Trails

de Mike
K7PI
Mercer Island, WA

----- Original Message ----- 
From: "Mack McCormick" <w4ax.mack at gmail.com>
To: "R-390 Group" <R-390 at mailman.qth.net>
Sent: Thursday, December 13, 2012 9:07 AM
Subject: [R-390] Alignment of the Mechanical Filters and IF with a 
SpectrumAnalyzer


>I have a calibrated high quality spectrum analyzer and tracking generator.
> Does anyone have experience with using a spectrum analyzer to:
>
> 1) *Adjust the mechanical filters? *There is some literature that suggests
> just peaking for noise can adversely affect the filter skirts.
>
> 2) *Stagger tune the IF?* My thought is that you could look at the overall
> spectrum of the IF and make optimal adjustments.
>
> I would of course make sure that I don't load the circuit with the 
> spectrum
> analyzer to skew the results.
>
> Does anyone have any experience or suggestions?
>
> -- 
> 73,
>
> Mack de W4AX
> http://w4ax.com
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