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

[Mack McCormick]

Mike,

Thank you! That will be great!

BTW, I lived in Edmonds for seven years and really miss the area. Mercer
Island is absolutely fantastic.

Mack


On Mon, Dec 17, 2012 at 5:17 PM, Leigh <bipi at comcast.net> wrote:

> 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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>
>


-- 
73,

Mack de W4AX
http://w4ax.com