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

[Leigh]

Too many requests to reply individually....will send out to all who have (or 
will request) or if too many, will post the PDF on my Web site.  Nice to see 
the interest.

Mike
K7PI

----- Original Message ----- 
From: "Leigh" <bipi at comcast.net>
To: "Mack McCormick" <w4ax.mack at gmail.com>; "R-390 Group" 
<R-390 at mailman.qth.net>
Sent: Monday, December 17, 2012 2:17 PM
Subject: Re: [R-390] Alignment of the Mechanical Filters and IF with 
aSpectrumAnalyzer


> 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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