[R-390] Alignment of the Mechanical Filters and IF with a SpectrumAnalyzer
Leigh
bipi at comcast.net
Tue Dec 18 00:09:56 EST 2012
Hello Roy,
Very good. I didn't realize it was already online. Guess it is covered
then. Thanks for the information.
73 de Mike
K7PI
----- Original Message -----
From: "Roy Morgan" <k1lky at earthlink.net>
To: "Leigh Sedgwick" <bipi at comcast.net>; "R-390 Group"
<R-390 at mailman.qth.net>
Sent: Monday, December 17, 2012 7:29 PM
Subject: Re: [R-390] Alignment of the Mechanical Filters and IF with a
SpectrumAnalyzer
>
> On Dec 17, 2012, at 5:17 PM, Leigh 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.
>
> Note:
>
> That document is in places very specific to the equipment used. In
> particular, it gives instructions on how to manage the sweep images from
> the sweep going "up" and then coming "down" in frequency.
>
> Many sweep generators nowadays (or even from some decades ago) have the
> equivalent of retrace blanking to eliminate the trouble of accounting for
> both up and down traces. With any of these systems, one important thing
> is to get the frequency sweep speed down low enough to avoid distortion
> in the picture you get.
>
> That document is online already:
> www.r-390a.net/faq-refs.htm
>
> Roy
>
>
> Roy Morgan
> k1lky at earthlink.net
> K1LKY Since 1958 - Keep 'em Glowing!
>
>
>
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